spec for external coating of above ground piping - april 2005

GIBSON ENERGY LTD.

SPECIFICATION

FOR

EXTERNAL COATING OF ABOVEGROUND PIPING

April 2006

Gibson Energy Ltd. Specification for External Coating of Aboveground Piping Revised April 2006

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1. DEFINTIONS

The following definitions apply within the scope of this specification: Applicator: The contractors and subcontractors employed to apply

the coating system, including but not limited to cleaning, surface preparation, coating application, and coating repairs.

Manufacturer: The supplier(s) of the coating system(s), including

primers and finish coats, and cleaning solvents. Specifying Authority: Gibson Energy Ltd. or a designated representative such

as a coating inspector or construction inspector.

2. GENERAL

The external coating of piping shall be done in accordance with this specification. For situations not covered in this specification, the applicator will follow manufacturer’s recommendations. The applicators must make themselves completely aware of this specification and the manufacturer’s application guideline. If there are any concerns or disagreements, they must be addressed prior to starting the project by either contacting the specifying authority or the manufacturer. In meeting the requirements of this specification, it is the responsibility of the applicator to follow good quality assurance practices as outlined in SSPC and NACE publications including the SSPC Painting Manual. It is also the responsibility of the applicator to meet the requirements of applicable Health, Safety, and Environmental legislation, regulations and standards including those of the specifying authority. It is the responsibility of the Applicator to maintain complete and accurate records of the cleaning, surface preparation and application processes. These records will be made available to the specifying authority and the requirement for those records is to be considered to be part of the contract.

For straight pipe lengths not controlled by fabricator / contractor quality programs, the Applicator shall transfer grade and heat numbers from the outside of the pipe to a protected area inside the pipe to enable positive identification of the material after abrasive blasting and painting processes are complete.

The entire surface of each pipe must be inspected prior to surface preparation. All dents, gouges and other significant surface imperfections must be reported to the


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specifying authority. Defects discovered subsequent to surface preparation may be attributed to handling by the Applicator.

3. SURFACE PREPARATION

3.1. CLEANING

Prior to abrasive blasting, all oil, grease and foreign contaminants must be removed by high pressure water washing, steam cleaning, or with the use of DEVPREP 88 Cleaner, followed by fresh water rinsing where required. Cleaning should comply with SSPC-SP 1 Solvent Cleaning and any other relevant specifications. This process must be followed to eliminate the possibility of impregnating deleterious contaminants into the steel surfaces during abrasive blasting which may lead to premature failure. At the sole discretion of the specifying authority, cleaning may not be required over newly fabricated piping areas.

3.2. SURFACE PREPARATION (New Fabrication):

The minimum surface preparation over new steel is SSPC-SP 6 / NACE No. 3 Commercial Blast Cleaning with a mutually agreed upon blast media, attaining a 2 – 3 mil jagged profile. SSPC-VIS 1 or other appropriate standards will be used as comparative guidelines.

3.3. SURFACE PREPARATION (Previously Coated Surfaces):

Small and localised areas can be hand or disc sanded with coarse (100 - 220 grit) wet and dry sandpaper. The intact coating system must be feathered back at least 3 - 4 inches from the periphery of the damaged area onto tightly adhered coating.

Larger and more numerous areas can be spot blasted to meet the required surface preparation specification. The intact coating system must be feathered back at least 3 - 4 inches from the periphery of the blasted area onto tightly adhered coating.


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4. COATING APPLICATION

4.1. COATING SYSTEM – PRIMER

Preferred: 1 Coat: Devoe Devran 201 Epoxy Primer @ 2 – 4 mils DFT Option: 1 Coat: Devoe Bar Rust 235 Epoxy @ 4 – 6 mils DFT Option: 1 Coat: Devoe Bar Rust 236 Epoxy @ 4 – 6 mils DFT

4.2. COATING SYSTEM - FINISH COAT

Preferred: 1 Coat: Devoe Devthane 389 Gloss Urethane @ 2 – 3 mils DFT Option: 1 Coat: Devoe Devthane 369 Gloss Urethane @ 2 – 3 mils DFT

4.3. APPLICATION NOTES

The preferred primer and finish coat system will be used at all times, unless an optional system is approved in writing by the specifying authority. The use of an optional system will be approved for specifically defined areas only. When blasting and applying the coating, adequate care must be taken to properly protect adjacent areas in order to avoid the occurrence of mechanical damage, blasting damage or over-spray. Colours to be Gibson Yellow (Pantene Matching System #117) over piping and valves. Gloss Black over structural shapes, supports and trim. Application technique may necessitate more than 1 coat in order to achieve specified dry film thickness. All recoat windows must be followed carefully to ensure proper adhesion of the topcoat material. For heavily pitted areas or corroded areas, apply 2 coats of the specified primer system in contrasting colours at recommended DFT per coat. The requirement for two coats shall be at the sole discretion of the specifying authority. When coating pipe and fittings to be joined by welding a 200 mm (8 inch) cutback is required from the end to be welded. Rotating equipment must be shielded from direct over blast or spray.


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Valve stems, gauge glasses and instruments are to be protected from abrasive blast or coating. Coatings are to be mixed and applied in accordance with manufacturers recommendations. For uniform thickness and appearance, spraying is the preferred method of application. In operating facilities, coating must be applied with rollers or power rollers. Spraying is not permitted. The specifying authority may allow exceptions for specific areas, such as stairs and platforms, on the condition that all over-spray is contained. The coating application using rollers or power rollers may not provide the same aesthetic characteristics as spray application, however performance will not be compromised providing the recommended film thickness is achieved. Welds are to be brushed prior to the first coat with the specified option prime coat thinned with an appropriate thinner to 25% to 30%. Allow these brushed areas to dry for approximately 30 – 45 minutes prior to the main application. Each coat of primer and topcoat must be within the dry film thickness (DFT) range as recommended by the supplier. The finished product must be completely cured and free of any sags, runs, inclusions or detrimental coating anomalies before it will be considered acceptable.

5. REPAIR PROCEDURES

5.1. SURFACE PREPARATION

Small and localised areas may be hand or disc sanded with coarse (100 - 220 grit) wet and dry sandpaper. Larger and more numerous areas can be spot blasted to meet the required surface preparation specification. The intact coating system must be feathered back at least 75 to 100 mm (3 - 4 inches) from the periphery of the damaged area onto tightly adhered coating.

5.2. COATING REPAIRS

In most cases repairs to a coating system are more difficult than the application of the original system. For repaired areas to perform equal to the original system, special care and consideration must be utilized.


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The specifying authority will instruct the applicator to use one of the following two repair methods, on a case-by-case basis:

OPTION 1: AESTHETIC DEFECT ONLY Replace the FINISH COAT to meet the original specification. OPTION 2: DAMAGE TO THE SUBSTRATE Apply 1 coat of originally specified primer at recommended DFT. When ready to topcoat, according to time at temperature guidelines, apply 1 uniform coat of originally specified finish coat to entire area to be repaired.

The choice of repair method is entirely at the discretion of the specifying authority. Implementation of the repair procedure should cover the entire area of surface preparation as well as slightly back onto the original coating application. Repaired surfaces will only attain a mechanical bond to the previous system, not the preferred mechanical/chemical bond. The preparation (feathering back) of the tightly adhered coating adjacent to the prepared area is extremely important to remove the impermeable top layer and to create a profile for the new coating system. All gloss and/or existing topcoat must be removed/abraded to create a mechanical profile to achieve the desired adhesion. Missing the recoat window due to time at temperature and/or contamination between coating applications constitutes a repair. The degree of surface preparation will be determined by the specifying authority and will require simply removal of the existing surface gloss or removal of the entire existing system. . When conducting coating repairs adjacent areas must be properly protected so that more mechanical damage does not occur. Care must be taken not to polish the newly exposed steel by utilising too fine a disc or sandpaper when feathering back the tightly adhered coating. This will reduce or remove the original blast profile adversely affecting the adhesion characteristics of the newly applied coating and may lead to premature failure. Desired adhesion and performance of the coating system can only be achieved when no foreign matter is present between the fresh coating and the steel or the original coating surface. Vacuum cleaning with a coarse bristle brush attachment is highly recommended prior to the application of the preferred coating system.


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6. INSPECTION

Where Gibson Energy Ltd. assigns an inspector to the work, that person assumes the role of Specifying Authority and is expected to make final and binding decisions with respect to the acceptability of the work. Prior to beginning the work, the Applicator will contact the Specifying Authority to determine the desired involvement. Where requested, the Applicator will furnish an Inspection and Test Plan (ITP) that includes:

• Key steps to completing the work

• Procedures to be utilized during the work

• Governing specifications or standards used in judging acceptability of the work

• Specific acceptance criteria

• Review, witness and hold points to be observed by the Applicator during the course of the work

• Sufficient space for the Specifying Authority to identify review, witness and hold points to be observed during the course of the work

• Sufficient space for sign-off at each step by the Applicators representative as well as the Specifying Authority.

Forty-eight (48) hours notice must be given to the Specifying Authority in advance of witness or hold points. Failure to provide sufficient notice may result in delay of the work or re-work for which the Applicator will take full responsibility. Upon completion of the work, the quality control records will be neatly bound and presented to the Specifying Authority for review. Once accepted, the Applicator will provide two (2) hard copies and one (1) electronic copy in PDF format to Gibson Energy Ltd. Acceptance by the Specifying Authority does not relieve the Applicator of responsibility for the quality of the work or conditions of guarantee or warranty offered or implied in the contract.

spec for external coating of above ground piping - april 2005

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