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The scope of this specification is rather 7. This specification does 7. This 7. Description 8. Shop Coating 2. It is not contemplated that the requirements of this 8. The 9. Field Coating following is a summary of the major sections of this specifi- 9. Scope 9. Description 9. Reference Standards Repair of Damaged Intact Coatings 4.
Definitions Pre-Application Procedures Application Procedures for Generic Groups of 5. Factors Affecting the Application of Coatings Curing and Handling of Coatings 6. Inspection 6. Safety and Environmental Concerns 6. Disclaimer Reference Standards tions. Verbal recommendations or instructions from an 3. Pre-Application Procedures shall govern unless otherwise specified.
See Section 11 for procedures unique to specific generic coatings. Each type of coating shall 3. Compressed Air 5. The label informa- quirements, and Proper Design Consider- tion shall be legible and shall be checked at the time of use.
Definitions consistency may be used. In every case, coating is shop or in the field. Before using a 4. Inorganic period of time. This definition is compatible with most containers in weathertight spaces where the temperature commonly used industry glossaries. The coating temperature shall be brought to the shipment to the site of erection.
See Note In no event shall the surface 4. If the surface is degraded or contaminated subsequent 5. The pigment in the be restored to the specified condition before coating appli- coating shall be lifted from the bottom of the container with cation see Note The tion of cleaned surfaces, the pretreatments, or, in the ab- poured off vehicle shall be returned to the coating with sence of a pretreatment, the prime coat shall be applied as simultaneous stirring, or boxed until the composition is soon as possible after the surface has been cleaned and uniform.
Suc- from one container to another. Strainers shall be of a size to remove only skins mize the amount of dust and other contaminants that may and undesirable matter but not to remove the pigment. Surfaces not in- 5. If the volume of such skins is visually estimated to 5.
The provisions of Sections 5. Two-component pretreatments shall shall be mixed into coatings in such a manner that they are be applied within the specified interval after mixing. When uniformly blended and all particles of the dry powder are proprietary pretreatments are used, the instructions of the wetted by the vehicle. These may be used only if they do not coating.
Test patches may be used does not deteriorate on standing may be mixed at any time to check adhesion of the coating prior to coating the entire before using, but if settling or phase separation has oc- surface. For multiple compo- 5. In all cases, the after the latter has been thoroughly mixed. Mixing of uniformity. Do not pour off the liquid which has separated most coatings: from the pigment and then add the catalyst to the settled pigment to aid mixing. The mixture shall be used within the pot life specified by the manufacturer.
Therefore only enough coating should be water, and so require a minimum humidity for complete catalyzed for prompt use. Most mixed, catalyzed coatings curing.
When specified, special continuous mixing equip- other adverse effects. In all such cases, the temperature and moisture in violation of air pollution control regulations. Coatings to be conditions of Sections 6. Where applied by brush will usually require no thinning. Coatings to cover is required to achieve these conditions, the steel shall be sprayed, if not specifically formulated for spraying, may remain under cover or be protected until dry or weather require thinning when proper adjustment of the spray equip- conditions permit its exposure.
Such striping shall extend a minimum of one able person acquainted with the correct amount and type of inch 2 cm from the edge. The stripe coat shall set to touch thinner to be added to the coating and familiar with pertinent before the full prime coat is applied. However,the stripe coat regulations relating to solvent emissions.
Thinner should be shall not be permitted to dry for a period long enough to allow at the same temperature as the coating material. At very low rusting of the unprimed steel. Alternatively, the stripe coat temperatures, thinners can shock sensitive coating materi- may be applied after a complete prime coat.
Stripe coating of edges, corners, rivets, welds, etc. Factors Affecting Application of Coat- edges in very corrosive surroundings. Striping is an expen- ings sive operation and may only be justified when it is believed the cost will be compensated for by extra life.
To prevent See Section 11 for factors unique to specific generic removal of the stripe coat of coating by later application of coatings.
Tinting of the striping coating is advis- with or without further adjustment. Stripe coating 6. Coating each coat shall be applied as a visually continuous film of shall not be applied to wet or damp surfaces unless the uniform thickness free of pores. All thin spots or areas coating is formulated and certified by the manufacturer for missed in the application shall be recoated and permitted to this type of application.
Coating shall not be applied on dry before the next coat of coating is applied. Coating ten requirements for humidity are met. Each intermediate and sembly. A latex primer shall not be applied at a tempera- OF 10OC. High humidities e. Curing and Handling of Coatings brush, roller, conventional spray, and airless spray. Special care shall be taken to ensure that all spray equipment is Since these coatings cure by reaction with If the maximum time is exceeded, the cured coating.
Safety in Coating Application. Always check with the coating manufacturer before Information pertaining to the safe handling, application, and The MSDSs for all cured for exterior exposure. Notes as specified by the procurement documents. Notes are not requirements of this specification. Inspection The contractor shall correct such work or and the dry film thickness will be below that intended for the replace such material as is found deficient under the speci- particular material.
It is advantageous to the contractor that fication. In case of dispute, the arbitration or settlement this material be kept warm or heated prior to use, inasmuch procedure established in the procurement documents, if as less material will be required, application will be easier, any, shall be followed.
If no arbitration or settlement proce- and the resulting film will meet the intent of the specification. Thus, overcoating should be accom- plished as soon as possible after curing requirements of Safety and Environmental Concerns undercoats are met. When intercoat contamination occurs They also shall be in accord with instructions Some are described underwriters.
Proper safety precautions shall be Safe and rain during coating application, drying, or curing are detrimental to the performance of most coatings.
It is. The variations are slight, and often in which the coating application should be done since the overshadowed by variations in workmanship. Gener- Brushing of primers has the advantage of working ally speaking, application should be done only under condi- coating into cracks and crevices and other surface irregu- tions which are conducive to quick evaporation of water. It may create brush marks, however, with coatings This generally means that the relative humidity should be having limited leveling.
Lacquer type coatings, such as low. Steel should not be coated when it is below the dew vinyls, may be applied by brush with considerable difficulty point since condensation of water on the steel will result. Spray operators must be properly selected and the surface of the steel. This same condition may prevail for trained. Careful supervision and inspection are necessary application of conventional, air-oxidizing coatings.
When with the various spray application methods to insure against the humidity is low and the steel is thoroughly dry beyond such difficulties as dirty surfaces, dry spray, pinholes, holi- question, it is believed that coatings may be applied, pro- days, missed areas, blind spots, contamination of coating or vided the coating is of a type which will not be injured or air, wind loss, or excessive outdoor overspray.
These include labor savings as a result of weather which will subject them to damage, nor should they fast application and a greater thickness per coat. Additional be applied when it is expected that the temperature will vary savings also can be traced to less flowback, less overspray, either below or above the temperature range recommended power compressor savings, use of higher solids in coating in writing by the manufacturer or drop to freezing before they formulations, and less sensitivity to changes in ambient have cured.
The dew point see Section 6. If It may be deter- tional spraying may be possible. The method works best on mined with a sling psychrometer, or other instrument, usu- large smooth areas such as tanks or walls.
Hand-held, digital moisture meters, is applied. Supplementary brush coating is mandatory for hygrometers, etc. These for these areas are available for general work. The require- electronic instruments can also provide simple measure- ments are generally the same as for brush and spray ment of relative humidity and dew point of a surface that is coating. Excellent results have been achieved, and it is at a different temperature than ambient conditions.
In practice, the dew point requirement can be presumed Roller coating is particularly useful where spraying cannot to be satisfied if a thin, clearly defined film of water applied be undertaken due to the hazards from overspray or the to the cleaned surface with a damp cloth evaporates within flammability of solvent.
Low temperatures greatly reduce the curing rates of Unless between the shop applied coat and the first coat applied in otherwise permitted, chemically cured coatings should not the field.
The period before a shop coat is to be topcoated in be applied when the surface, coating, or ambient tempera- the field can vary from the construction schedule. Either method is satisfactory if properly When longer periods of exposure are anticipated, spe- performed and the coating is formulated for the application cial consideration should be given to surface preparation,. Between shop priming and field MATERIALS coating, structural steel is often exposed to the most severe The standards, reports, and publications listed below environments it will ever encounter and at a time when it is are not required as part of the specification but are recom- protected by only one coat of primer.
The prime coat of mended resources note that the standards listed in Section coating is usually formulated to provide short-term protec- 3 are required parts of this specification.
Other methods of speci- Systems fying and accepting weld surfacing conditions are employed PA Guide 5 Guide to Maintenance Coating in various industries. The weld surfacing requirements should Programs generally be placed in the project specifications so that the Guide 6 Guide for Containing Debris painting contractor will not have to perform welding or Generated During Paint Removal grinding to provide the specified final surface conditions.
Operations Guide 7 Guide for the Disposal of Lead- It is essential, however, that the removal of deterio- Primers rated coating be carried back around the edges of the spot Guide 11 Guide for Coating Concrete or area until an area of completely intact and adherent Guide 12 Guide of the Illumination of coating film, with no rust or blisters underneath, is attained.
If the new Topcoat coating curls or lifts after application to an existing coating, Paint 25 Zinc Oxide, Alkyd, Linseed Oil the cleaning and application procedures should be reviewed Primer for Use Over Hand to determine if good coating practices have been followed. Cleaned Steel If the new coating is found to be incompatible with the Paint 25 BCS Zinc Oxide, Alkyd, Linseed Oil previous coating system, either the primer should be re- Primer for Use Over Blast placed with one more compatible, or the old coating should Cleaned Steel be completely removed before application of a new system.
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Editors’ Picks All magazines. Explore Podcasts All podcasts. Difficulty Beginner Intermediate Advanced. Explore Documents. The trigger of the gun shall be shall be completely removed before applying coating. Observe released at the end of each stroke see Note Repairs shall be performed in accordance and held fully open during all spraying to ensure proper with the coating manufacturers written recommendation as application of coating. During application, the gun shall be held approved by the facility owner.
The 8. Further, be in accordance with all the provisions of Section 8. The manufacturers instructions are to be followed regarding the 8. The traps or separators must be of adequate size and must be bled continuously or 8. ASTM D frequently called the blotter test including but not limited to runs, drips, sags, holidays, overspray, or incorrect coating thickness, shall be repaired in.
SSPC surface preparation standards require 9. Metal that finished. In addition to the cleaning required in Section Inorganic the metallic substrate before any application of coating.
If zinc-rich coatings shall not be corrected in this manner unless any coating is damaged due to concrete work, the damaged the manufacturers instructions specifically permit this practice. Compatible and non-bleeding markers or coating sticks shall be used.
Where the remaining coating is thick, all exposed edges shall be feathered. Rust spots shall The manufacturers instructions All defects arising from unexpected incompatibility shall be corrected as specified. Metallic substrates shall be cleaned and as minimum and maximum curing times shall conform to recoated or touched up with the specified coating whenever it manufacturers written recommendations prior to topcoating.
Metal If the maximum cure time is exceeded, the cured coating that has been shop coated shall be touched up with the same shall be roughened or otherwise treated as recommended by coating as the shop coat unless otherwise specified.
Inorganic the manufacturer of the topcoat or overcoat before applying zinc-rich coatings shall not be corrected in this manner unless another coat. Always check with the coating manufacturer before force-curing a coating. When warming coatings, their temperature should not exterior exposure. When the coating or thinner has a When this is not feasible, the surface should be restored to Chemical or water scrubbing documents.
For high-performance coating service, special weld The contractors work plan or the inspectors inspection surfacing may be required to provide suitable surface conditions plan shall include hold points prior to each step of the for the coating system specified. These include: as other design and fabrication requirements for improving Pre-surface preparation coating serviceability.
Other methods of specifying and accepting weld surfacing conditions are employed in various Post-surface preparation industries. Post-curing It is impossible to set down specific rules that govern the limits in which the While every precaution one coating to another may be large.
Generally speaking, is taken to ensure that all information furnished in SSPC application should be done only under conditions that are standards standard is as accurate, complete, and useful as conducive to quick evaporation of water. This generally means possible, SSPC cannot assume responsibility nor incur any that the relative humidity needs to be low. Metallic substrates obligation resulting from the use of any materials, coatings, or should not be coated when it is below the dew point since methods specified herein, or of the standard itself.
The only exception is for coatings that are formulated to tolerate The user of this Coatings that dry solely by evaporation of organic solvent standard, as well as the user of all products or practices are not normally harmed by application to metallic substrates described herein, is responsible for instituting appropriate which are below 32 F 0 C ; however, under such conditions, health and safety practices and for ensuring compliance with the danger always exists that there will be a layer of ice on all governmental regulations.
This same condition may prevail for application of conventional, air-oxidizing NOTES coatings. When the humidity is low and the metallic substrate is thoroughly dry, coatings may be applied provided they will Notes are not requirements of this standard.
Generally speaking, coatings should not be applied when Particular care should be observed with respect to type of ambient conditions will subject them to damage, nor should they thinner, amount of thinner, coating temperature, and operating be applied when it is expected that the temperature will vary techniques in order to avoid deposition of coating which is too either below or above the temperature range recommended viscous, too dry, or too thin.
At very low temperatures, thinners in writing by the manufacturer or drop to freezing before they can shock sensitive coating materials, resulting in gelling.
It may be necessary to use an approved different coating Coatings formulated for application to hot surfaces may material or other equipment to resolve these problems. Conversely, coatings formulated for application Many preconstruction Low temperatures greatly reduce the curing rates of primers are not intended to provide long-term protection of the chemically cured coatings certain epoxies, urethanes, metallic substrate, particularly during exposure to dampness, inorganic zinc-rich coatings, coal tar epoxies, etc.
Between shop application of The dew point is the temperature at which moisture from the primer and field coating application, the metallic substrate the air will begin to condense.
If the surface temperature of the is often exposed to the most severe environmental conditions substrate is at the dew point, moisture will condense on it. Dew it will ever encounter at a time when it is protected by only one point may be determined with a sling psychrometer, or other coat of primer.
The length of time anticipated between shop instrument, usually requiring determination of wet and dry bulb application of the primer and the first field-applied coating temperatures ASTM E Hand-held, digital psychrometers, should be considered when selecting the primer to be used. These electronic that it may have to receive periodic maintenance to continue instruments can alsomeasure of relative humidity and dew to protect the metallic substrate from corrosion and be in a point of a surface that is at a different temperature than the air.
When long periods of exposure are anticipated, special consideration should be However, some coatings such as inorganic zinc and moisture-cured urethane coatings cure by chemically Members may be coated on the ground before erection, provided any damaged A lower of coatings after erection.
Stripe is preferable to manual hand mixing due to the higher coating is most effective on edges that are prepared by viscosity of materials in industrial coatings, particularly where grinding.
Tinting of the striping coating is advisable to promote multi-component materials are used. Pigments or solids contrast see Section 7. Additional information on stripe that inadvertently are not mixed back into the coating may coating and edge protection is available in SSPC-PA Guide The coating manufacturer should be consulted for acceptable mixing It new coating.
It is essential, however, that the removal of may, however, create brush marks with coatings having limited deteriorated coating be carried back around the edges of the leveling. Edges of tightly adherent coating remaining around the area Spray operators must be properly trained. Several advantages are possible with the various high- Unless experience or spot tests have shown otherwise, it pressure airless methods of coating application, both hot and is usually preferable to use the same generic type of coating cold spray.
These include faster application and a greater for maintenance recoating as the original coating. If the new thickness per coat than is achieved by conventional air spray. If coating formulations, and less sensitivity to changes in ambient the new coating is found to be incompatible with the previous temperature during application.
Supplementary brush coating is that the owner or authorized representative or those who mandatory for those areas on structural metallic substrates, manage coating projects for the owner or authorized even though special rollers for these areas are available for representative, require the contractor to submit a detailed, general work.
Roller coating is particularly useful coating application process for review and acceptance by where spraying cannot be undertaken due to damage from the facility owner or authorized representative prior to project other hazards. The preparation and use of a contractor work plan has been proven an effective mechanism for project oversight and Verify with the coating manufacturer and preparation, coating application, coating initial cure, tracking the owner or authorized representative that sags and runs and correction of non-compliant work, and demobilization.
PA 1 left in the coating are aesthetically acceptable and will not focuses on the coating application process and application- adversely affect its performance. Each portion of the work plan will need Brandon, J. Brandon and M. Performance-Based J. Any photocopying, re-selling, or redistribution of these standards, guides, and technical reports by printed, electronic, or any other means is strictly prohibited without the express written consent of SSPC: The Society of Protective Coatings and a formal licensing agreement.
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Exposed Frfe a supplement to. Qualitative method for antifouling long life paint for marine facilities or system. High Temperature Silicone Acrylic. Scope 7. Application Methods 7. I This specification covers procedures for the paint- sspc pa 1 free download. The scope of this specification is rather 7. This specification does 7. На этой странице 7. Description 8. Shop Coating 2. It is not contemplated that the requirements of this 8.
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Pre-Application Procedures shall govern unless otherwise specified. See Section 11 for procedures больше на странице to specific dowload coatings.
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The coating temperature shall be brought to the shipment to the site of erection. See Note In no event shall the surface 4. If the surface is degraded or contaminated subsequent 5.
The pigment in the be restored to the specified condition before coating appli- coating shall be lifted from the bottom of the container with cation http://replace.me/8000.txt Note The tion of cleaned surfaces, the pretreatments, or, in the ab- poured off vehicle shall be returned to the coating with sence of a pretreatment, the prime coat shall be applied as simultaneous stirring, or boxed until the composition is soon as possible after the surface has been cleaned and uniform.
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sspc-pa1 paint application specification no. 1.Sspc pa 1 free download
Air-assisted airless spray shall be per- usually the case or is detrimental to the welding operation formed in accordance with all provisions of Sections 7. Sections 7. All welds shall either be blast cleaned, 7. Compatible and non- 7. Field Coating 9. Such steel shall be cleaned and be free of dirt, oil, chlorides, or other contaminants. Damaged areas of shop applied coatings are to be touched-up in compliance with the requirements of 9. See SSPC-TU 4 for additional information on welds shall be cleaned before painting, using surface prepa- detection of soluble salts on steel surfaces.
All welds shall either be blast cleaned, 9. This touch-up shall include preparing, cleaning and coating of field connections, welds or rivets, and all damaged or IO.
Repair of Damaged Intact Coatings defective coating and rusted areas as specified. Cleaning shall be performed two inches 50 mi- erection. Whenever possible, the last full finish coat of crometers beyond the damaged areas in all directions or coating shall be applied after erection of the structure and until tightly adhered coating is obtained.
Where the remain- repair of damaged areas of existing coating. All defects arising from unexpected incompatibility 9. It is important that the procurement documents cover precisely the work to be 9. In the absence of as required by the specification. In addition to the cleaning specified in Section 5. Application Procedures for Generic drippings shall be removed before any application of coat- Groups of Coatings ing.
If any coating is damaged, the damaged surface shall be Minimum and maximum dry film thicknesses are applied, special heavy-duty pump type spray equipment indicated, but thicker coatings should be applied when shall be used.
Materials thinning until they attain the proper consistency for applica- which are not specifically covered in this specification shall tion. They shall be applied at a coverage that will result in be applied in accordance with the directions of the manufac- the dry film thickness specified or, if not specified, the dry turer. The These coatings shall or asphalt applied by brushing, troweling, or spraying. If be thinned as recommended by the manufacturer. They spray applied, special heavy-duty pump type spray equip- shall be applied at a coverage that will result in the dry film ment shall be used.
Thinning should not be necessary and thickness specified or, if not specified, the dry film thickness shall not take the place of adequate stirring. They shall be recommended by the manufacturer. When vinyl or chlori- applied at a coverage that will result in the dry film thickness nated rubber coatings are applied by brush, coatings shall specified or, if not specified, the dry film thickness as be applied to the surface with a minimum of brushing so that recommended by the manufacturer.
The expected range of there is little or no lifting or softening of the undercoats. For additional information, refer to Paints 12,32, and minous coating thin film refers to low consistency solutions A minimum total dry film thickness of 70 mils of coal tar or asphalt without filler or with only a slight amount micrometers is suggested.
They shall be applied in the same manner as The tar or asphalt and water. Since they are compounded with expected range of dry film thickness for these thin film water they must not be permitted to freeze at any time bituminous coatings is from 1. These emulsions shall be applied by brush- crometers. Unless otherwise specified, the necessary num- ing, spraying, or troweling. If spray applied, special heavy- ber of coats shall be applied to provide a total minimum dry duty pump type spray equipment shall be used.
Thinning film thickness of 5 mils micrometers. They shall be applied at a coverage that film : The term cold-applied bituminous coating medium will result in the dry film thickness specified or, if not film refers to high consistency filled solutions of coal tar or specified, the dry film thickness as recommended by the asphalt.
They shall be applied by brushing or spraying. If manufacturer. The expected range of dry film thickness for spray applied, special heavy-duty pump type spray equip- the bituminous emulsion is from 8 to 15 mils to ment shall be used. This material should be stirred without micrometers per coat and unless otherwise specified the thinning until it attains proper consistency for application. It necessary number of coats shall be applied to provide a shall be applied at a coverage that will result in the dry film minimum dry film thickness of 20 mils micrometers.
The expected range and enamel for the interior and exterior of steel pipe, tanks of dry film thickness for the cold-applied bituminous coating and hydraulic structures shall be applied in accordance medium film is from 5 to 10 mils to micrometers with the requirements of American Water Works Associa- per coat and unless otherwise specified, the necessary tion AWWA specification C unless otherwise speci- number of coats shall be applied to provide a minimum dry fied.
This specification is not intended to cover application film thickness of 12 mils micrometers. Such application shall be done in accordance tovery high consistencyfilled solutions of coal tar or asphalt.
If spray Also, any special This shall be done slowly so as not to create a vortex and precautions and instructions by the manufacturer shall be introduce moisture into the coating which could reduce the followed.
Chemically cured coatings shall not be applied pot life. When urethane coatings may be applied by brush, roller, conven- coatings formulated for low temperature application are tional spray, airless spray, or plural-component spray. Mixing shall be done slowly Guide These urethane ings shall be applied by spray. Application by brush shall be coatings are extremely susceptible to moisture contamina- limited to small areas and touch-up work.
If the zinc powder tion and shall not be applied unless temperatures, both is packaged separately, mix with the vehicle just before use. The coatings shall be applied to a dry film When applying by spray, the zinc dust roller. Cross brushing or cross spraying application is highly shall be kept in suspension by use of a mechanical agitator desirable.
Application by spray tends to provide the best for both airless and air atomized conventional spray. The leveling. Conventional or airless spray can be used with vessel containing the coating and the spray gun shall be most latex coatings. Since one-coat systems have very kept at approximately the same elevation e. Prior to topcoating, a barrier or tie always be applied. On structural steel, the preferred system coat may be required for overcoating with certain generic is two coats of primer and one or more topcoats to achieve coatings.
Where the dry film thick- followed. Sufficient curing of the zinc-rich primer is neces- ness is not specified, apply each coat at a minimum dry film sary before topcoating. The coating manufacturer may re- thickness of 2. Dry film thickness of 7. For additional spray of the zinc-rich primer will result in improper adhesion information, refer to SSPC Paints 23 and Dry spray shall be removed with a stiff bristle brush or wire screen without polishing the surface of the A latex primer shall not be applied at a tempera- OF 10OC.
High humidities e. Curing and Handling of Coatings brush, roller, conventional spray, and airless spray. Special care shall be taken to ensure that all spray equipment is Since these coatings cure by reaction with Safety in Coating Application.
Always check with the coating manufacturer before Information pertaining to the safe handling, application, and The MSDSs for all cured for exterior exposure. Notes as specified by the procurement documents. Notes are not requirements of this specification. Inspection The contractor shall correct such work or and the dry film thickness will be below that intended for the replace such material as is found deficient under the speci- particular material.
It is advantageous to the contractor that fication. In case of dispute, the arbitration or settlement this material be kept warm or heated prior to use, inasmuch procedure established in the procurement documents, if as less material will be required, application will be easier, any, shall be followed.
If no arbitration or settlement proce- and the resulting film will meet the intent of the specification. Thus, overcoating should be accom- plished as soon as possible after curing requirements of Safety and Environmental Concerns undercoats are met. When intercoat contamination occurs They also shall be in accord with instructions Some are described underwriters. Proper safety precautions shall be Safe and rain during coating application, drying, or curing are detrimental to the performance of most coatings.
The variations are slight, and often in which the coating application should be done since the overshadowed by variations in workmanship. Gener- Brushing of primers has the advantage of working ally speaking, application should be done only under condi- coating into cracks and crevices and other surface irregu- tions which are conducive to quick evaporation of water.
It may create brush marks, however, with coatings This generally means that the relative humidity should be having limited leveling. Lacquer type coatings, such as low. Steel should not be coated when it is below the dew vinyls, may be applied by brush with considerable difficulty point since condensation of water on the steel will result. If the coating is thinned, the manufacturer and type of thinner shall 8. The amount of thinner used should be the same as stated on the Test 8.
The maximum amount of 8. SSPC surface preparation standards require 9. In addition to the cleaning required in Section Inorganic the metallic substrate before any application of coating. Compatible and non-bleeding markers or coating sticks shall be used. Where the remaining coating is thick, all exposed edges shall be feathered.
Rust spots shall Inorganic the manufacturer of the topcoat or overcoat before applying zinc-rich coatings shall not be corrected in this manner unless another coat. Always check with the coating manufacturer before force-curing a coating.
When warming coatings, their temperature should not exterior exposure. When the coating or thinner has a When this is not feasible, the surface should be restored to Chemical or water scrubbing documents. These include: as other design and fabrication requirements for improving Pre-surface preparation coating serviceability.
Other methods of specifying and accepting weld surfacing conditions are employed in various Post-surface preparation industries. Post-curing While every precaution one coating to another may be large.
Generally speaking, is taken to ensure that all information furnished in SSPC application should be done only under conditions that are standards standard is as accurate, complete, and useful as conducive to quick evaporation of water.
This generally means possible, SSPC cannot assume responsibility nor incur any that the relative humidity needs to be low. The only exception is for coatings that are formulated to tolerate This same condition may prevail for application of conventional, air-oxidizing NOTES coatings.
When the humidity is low and the metallic substrate is thoroughly dry, coatings may be applied provided they will Notes are not requirements of this standard. Generally speaking, coatings should not be applied when Particular care should be observed with respect to type of ambient conditions will subject them to damage, nor should they thinner, amount of thinner, coating temperature, and operating be applied when it is expected that the temperature will vary techniques in order to avoid deposition of coating which is too either below or above the temperature range recommended viscous, too dry, or too thin.
At very low temperatures, thinners in writing by the manufacturer or drop to freezing before they can shock sensitive coating materials, resulting in gelling. It may be necessary to use an approved different coating Coatings formulated for application to hot surfaces may material or other equipment to resolve these problems. Conversely, coatings formulated for application Many preconstruction Low temperatures greatly reduce the curing rates of primers are not intended to provide long-term protection of the chemically cured coatings certain epoxies, urethanes, metallic substrate, particularly during exposure to dampness, inorganic zinc-rich coatings, coal tar epoxies, etc.
If the surface temperature of the is often exposed to the most severe environmental conditions substrate is at the dew point, moisture will condense on it. Dew it will ever encounter at a time when it is protected by only one point may be determined with a sling psychrometer, or other coat of primer. Hand-held, digital psychrometers, should be considered when selecting the primer to be used.
These electronic that it may have to receive periodic maintenance to continue instruments can alsomeasure of relative humidity and dew to protect the metallic substrate from corrosion and be in a point of a surface that is at a different temperature than the air.
When long periods of exposure are anticipated, special consideration should be However, some coatings such as inorganic zinc and moisture-cured urethane coatings cure by chemically Members may be coated on the ground before erection, provided any damaged A lower of coatings after erection.
Stripe is preferable to manual hand mixing due to the higher coating is most effective on edges that are prepared by viscosity of materials in industrial coatings, particularly where grinding.
Tinting of the striping coating is advisable to promote multi-component materials are used. Pigments or solids contrast see Section 7. Additional information on stripe that inadvertently are not mixed back into the coating may coating and edge protection is available in SSPC-PA Guide The coating manufacturer should be consulted for acceptable mixing For example, vented.
Daubers, natural or that have very short cure times or are high-build. Any of these methods is satisfactory if properly heat, and decrease working time. The variations are slight, and often It new coating. It is essential, however, that the removal of may, however, create brush marks with coatings having limited deteriorated coating be carried back around the edges of the leveling. Edges of tightly adherent coating remaining around the area Spray operators must be properly trained.
Several advantages are possible with the various high- Unless experience or spot tests have shown otherwise, it pressure airless methods of coating application, both hot and is usually preferable to use the same generic type of coating cold spray.
These include faster application and a greater for maintenance recoating as the original coating. If the new thickness per coat than is achieved by conventional air spray. If coating formulations, and less sensitivity to changes in ambient the new coating is found to be incompatible with the previous temperature during application.
Supplementary brush coating is that the owner or authorized representative or those who mandatory for those areas on structural metallic substrates, manage coating projects for the owner or authorized even though special rollers for these areas are available for representative, require the contractor to submit a detailed, general work. Roller coating is particularly useful coating application process for review and acceptance by where spraying cannot be undertaken due to damage from the facility owner or authorized representative prior to project other hazards.
The preparation and use of a contractor work plan has been proven an effective mechanism for project oversight and Verify with the coating manufacturer and preparation, coating application, coating initial cure, tracking the owner or authorized representative that sags and runs and correction of non-compliant work, and demobilization. The agitator blade shall be capable of coating manufacturer. Care shall be taken to limit the speed to ensure 6.
Mixed this purpose. Mixing of solvent-containing coatings in open containers shall be done 6. Succeeding coats shall be cut loose from the sides of the container, removed and shall be applied before contamination of any existing coating discarded.
If the volume of such skins is visually estimated to occurs. Multi-component pretreatments shall be applied within the specified interval after mixing.
When 6. These shall be used only as specified and only in the correct proportions in accordance with the coating if it is documented by the coating manufacturer that the inhibitor manufacturers written recommendations. Proper mix ratio is compatible with the coating to be used and will not have shall be maintained when mixing multi-component coatings to adverse long-term effects on the performance of the coating.
The coating shall be blended completely to ensure that all elements of the materials 6. Coating separately packaged shall be added to the base coating only shall be strained or filtered after mixing according to the after the latter has been thoroughly mixed.
The proper volume manufacturers recommendations, except where application of the catalyst shall then be slowly poured into the required equipment is provided with strainers. Strainers shall be of a volume of base with constant agitation. To avoid mixing incorrect size to remove skins and undesirable matter, but not to remove ratios of components, mix only complete kits. Do not pour the pigment. The mixture 6. Most mixed, catalyzed coatings cannot be stored, and 6.
The pigment in the coating containers for later appropriate disposal see Note When specified, special continuous mixing equipment shall be thoroughly mixed separately before combining and shall be used according to the manufacturers directions.
For multiple components, similar components of the two different colors shall be blended together before 6. If there is a conflict between the requirements of the manufacturer and the project specification, the more 6.
If coating thickness is not specified, the dry film thickness DFT shall comply with the coating manufacturers written 6. The coating application shall be scheduled to provide protection to the substrate at all construction stages 6. In no case shall more thinner be added than corners, crevices, rivets, nuts, bolts, welds, and sharp edges that recommended by the manufacturers written instructions.
Unless otherwise specified or approved by the facility owner, the stripe coat shall be applied by brush 6. The stripe coat shall extend a coating shall be in accordance with the coating manufacturers minimum of one inch 2 cm from the edge it is protecting.
The product data sheets for the specific coating being applied, the coating manufacturers recommended recoat windows for the prevailing ambient conditions and surface temperature, and stripe coat and full coat shall be observed see Note All thinning shall be done under or the finished welds, the metallic substrate shall not be coated supervision of a knowledgeable person acquainted with the within four inches millimeters of the areas to be welded, correct amount and type of thinner to be added to the coating except when using inorganic zinc-rich primer, which may be and familiar with pertinent regulations relating to solvent applied to within two inches 50 millimeters of the weld area.
All thin spots or areas to indicate complete coverage of the surface. Tinting shall be missed in the application shall be recoated and permitted to performed in such a manner that it will not be necessary to tint dry before the next coat of coating is applied.
Field tinting shall be done only with coatings of the same type from the same manufacturer. When the coating 7. The tinting material shall be compatible with the film thickness determinations shall be performed as specified coating and not detrimental to its service life.
If no Coating Thickness Restriction Level is that the coating be tinted by the manufacturer and appropriately specified, Level 3 shall be the default level. Single component coatings to be blended for tinting. Inorganic zinc-rich coatings shall not be corrected in this manner unless the manufacturers instructions 8. Consult the coating manufacturer for the appropriate see Notes If a conflict arises between time interval before recoating.
This standard contains If, for any reason, this time period is exceeded, the undercoat requirements for application using the most common application surface shall be treated as recommended by its manufacturer methods.
Specialized methods such as plural-component before topcoating. Such treatments include mild abrasion, spray, dipping, flow coating, electrostatic spray, and fluidized solvent treatment, and use of a tie coat. Remove surface bed application shall be performed by craft workers who have contamination that could affect the adhesion of subsequent been properly qualified and trained for specialized equipment coats. Whichever application method is used, the dry film 7.
If no requirements are specification documents. Uncoated shall be in accordance with the following: faying surfaces shall meet the surface preparation and cleanliness requirements for the specified class and shall be 8. If coated faying surfaces are required enable proper application of coating.
If the coating is thinned, the manufacturer and type of thinner shall 8. The amount of thinner used should be the same as stated on the Test 8.
Certificate; however greater or lesser amounts of thinner may be necessary for proper atomization. The maximum amount of 8. The roller cover nap shall be appropriate for the the full specified coating system before assembly. Coating rollers shall be of a style and quality that will enable proper application of coating having the continuity 8. The pressure on the material in the pot shall be adjusted when 8. If roller application to irregular so high as to cause excessive fogging of coating, excessive surfaces is permitted, the coating shall be immediately brushed evaporation of solvent or loss by overspray.
The equipment shall be maintained in recommendations, site-specific conditions and the proper working condition. Spray equipment shall meet the configurations of the surfaces being coated. This pressure shall be so that dirt, dried coating, and other foreign materials are not sufficiently high to properly atomize the coating.
Pressures deposited in the coating film. Any solvents left in the equipment considerably higher than those necessary to properly atomize shall be completely removed before using. During utilize proper filters in the high-pressure line so that dirt, dry application, the gun shall be held perpendicular to the surface coating, and other foreign materials are not deposited in the and at a distance that will ensure that a wet layer of coating coating film see Note Any solvents left in the equipment is deposited on the surface.
The trigger of the gun shall be shall be completely removed before applying coating. Observe released at the end of each stroke see Note Repairs shall be performed in accordance and held fully open during all spraying to ensure proper with the coating manufacturers written recommendation as application of coating. During application, the gun shall be held approved by the facility owner. The 8. Further, be in accordance with all the provisions of Section 8. The manufacturers instructions are to be followed regarding the 8.
The traps or separators must be of adequate size and must be bled continuously or 8. ASTM D frequently called the blotter test including but not limited to runs, drips, sags, holidays, overspray, or incorrect coating thickness, shall be repaired in. SSPC surface preparation standards require 9.
Metal that finished. In addition to the cleaning required in Section Inorganic the metallic substrate before any application of coating.
If zinc-rich coatings shall not be corrected in this manner unless any coating is damaged due to concrete work, the damaged the manufacturers instructions specifically permit this practice.
Compatible and non-bleeding markers or coating sticks shall be used. Where the remaining coating is thick, all exposed edges shall be feathered. Rust spots shall The manufacturers instructions All defects arising from unexpected incompatibility shall be corrected as specified. Metallic substrates shall be cleaned and as minimum and maximum curing times shall conform to recoated or touched up with the specified coating whenever it manufacturers written recommendations prior to topcoating.