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Questions concerning the interpretation of the content of this standard or comments and questions concerning the procedures under which this standard was developed should be directed in writing to the standardization manager, American Petroleum Institute, L Street, N.

Requests for permission to reproduce or translate all or any part of the material published herein should also be addressed to the general manager. API standards are published to facilitate the broad availability of proven, sound engineering and operating practices. These standards are not intended to obviate the need for applying sound engineering judgment regarding when and where these standards should be utilized.

The formulation and publication of API standards is not intended in any way to inhibit anyone from using any other practices. Any manufacturer marking equipment or materials in conformance with the marking requirements of an API standard is solely responsible for complying with all the applicable requirements of that standard.

API does not represent, warrant, or guarantee that such products do in fact conform to the applicable API standard. All rights reserved. No part of this work may be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission from the publisher.

It was prepared by a Formulating Committee which included representatives of Pipeline Operators and Line Pipe Manufacturers and advisors from coating manufacturers and coating applicators as well as other interested individuals. Recommendations made in this Recommended Practice need not necessarily be considered as minimum standard requirements. As new materials and practices are developed they will be considered for inclusion in this Recommended Practice. API publications may be used by anyone desiring to do so.

Suggested revisions are invited and should be submitted to the standardization manager, American Petroleum Institute, L Street, N. This Recommended Practice provides for the internal coating of line pipe used for non-corrosive natural gas service.

The recommendations provided herein cover: a. Section 1 Section 2 Section 3 Section 4 Section 5 1. It is intended that the applicator be responsible for complying with all of the provisions of this Recommended Practice, but that the Purchaser may make any investigation necessary to satisfy himself of compliance by the applicator.

Pigmented or clear base. Pigmented or clear converter. See 3. Application solvent for adjusting to suitable spray viscosity. Directions for handling and storing of the coating materials. These basic physical properties and performance test results shall be within the range permitted in this Recommended Practice Section 2. The coating materials shall be mixed before use by agitating together portions of base and converter as recommended by the supplier. Wt Gal. An acceptable method is an infra-red spectrum.

NACE No. The surface to be coated shall be sand blasted to any of the following standards: Application shall be made by spray on the prepared side of a test panel. The back and edges of the panel shall be protected. Tests shall be performed on duplicate panels. A test result is acceptable when results from both test panels comply with the criteria listed below. In case of failure of either panel, the test shall be repeated on duplicate panels.

One such retest shall be permitted. Approval or selection of the materials shall be done far enough in advance preferably not less than 30 days to provide material at the scheduled start of the work. Selection of alternate coating materials from the approved list may be made at any time by agreement between the purchaser and the applicator. Stripping Appendix 3 Appendix 3 Bend At 0.

Materials shall be shipped and stored under cover in such a manner to prevent contamination and adverse effects on application or performance. After the material is mixed, it shall be continuously agitated at slow speed.

The coating material Continuous power agitation equipment must be used on the gun supply tanks or paint sumps to maintain uniformity during short production interruptions. Cleaning and coating shall be done in separate stages to permit surface examination and prevent coating contamination. Clean air may be used to accelerate drying and cleaning. For accurate pressure readings on airless spray unites, the pressure gauge should be equipped with a pulsation dampener.

The location of this gauge should be downstream of all pressure drop causing devices, as near to the gun tips as is practicable. Pipe surface shall be thoroughly dry before application of coating material.

All components of the cleaning machine that enter the pipe shall be clean to prevent the deposition of grease, dirt, or other foreign material on the cleaned pipe surface. Burnishing of pipe surfaces should be avoided. This applies to coating material that has been thinned to proper application viscosity. Coating material deposited on bevels and lands of the pipe ends or in cutback areas shall be removed immediately after coating. Unbonded coating shall be completely removed. Protection from these conditions shall be provided until the coating is tack free.

Prior to recoating, pipe should be thoroughly cleaned to remove dust and accumulated debris. Heat may be used to accelerate cure, providing it produces no adverse effects to the pipe or coating. Stenciling or marking paint must be compatible with the coating on the pipe and of a contrasting color.

Smaller areas may be spot repaired per 4. Coating that overlays 5. Blushing, regardless of the degree of color change, shall not be considered detrimental provided the affected area meets the requirements of 5. Purchaser may require that the applicator set aside such pipe as their representative may request for testing, providing that the amount of such pipe shall not exceed two joints for each eight-hour production period on a current basis, or one pipe from each four-hour production period.

The pinhole test 5. All other production tests shall be conducted once per shift. Limits of pH: within 0. This test for pH is not applicable to the bare surface of mechanically cleaned pipe.

The panel or slide is coated as the pipe is coated. After the panel or slide is removed, the test area on the pipe is spot repaired. Pinhole dispersion shall be held to a minimum. The difference of the two is the coating thickness and shall be at least 0. Coat panels as set out in Paragraph 3. Reweigh coated panels in air and in distilled water as outlined in Steps 6b and 6c above. Report the percent of solids by weight of the mixed coating material on the basis of the average of three determinations.

Select three aluminum test panels, each 18 to 24 in. Weigh aluminum panels in the air to 0. Note: All testes are to be made in triplicate and reported as the average of same.

The inscribed side shall face the salt source. The duration of the test shall be hours. Reporting: The test result shall be satisfactory if after 30 minutes of drying upon removal from fog and spray, the coating exhibits no blistering, and not more than 0. Apply 1 in. Firmly press with the thumb nail so as to yield a uniform color of contact area.

Remove the tape with a snapping action. Inspect the squares thus produced. Acceptance is constituted by lifting of no material other than cuttings. Continue test as follows: 1. The coating shall be examined within three minutes from the release of pressure. Any blister found shall constitute a failure. Continue as follows: 1. Maintain test pressure for 24 hours.

Quickly release pressure. Observe panel within 5 minutes. Examination of panels shall be made as follows: opaque shield shall extend a minimum of 6 in.


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Liquid Epoxy resin flow-coat linings have established themselves as standard practice in this application. Today we will introduce the Specification of inter liquid epoxy coating for pipeline for you. Liquid epoxy coating is a coating system composed of two substances which is applied in a single coat as anticorrosion protection for steel pipes. Then liquid epoxy is applied to the pipes inner surface by spray guns in a bogey, forming a uniform single layer epoxy which cure after application. Section 1 Scope.





API RP 5L2-2002 (2015).pdf


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