BS EN ISO 21809-2:2007 pdf download.Petroleum and natural gas industries – External coatings for buried or submerged pipelines used in pipeline transportation systems – Part 2:fusion-bonded epoxy coatings.
ISO 21809 consists of the following parts, under the general title Petroleum and natural gas industries-External coatings for buried or submerged pipelines used in pipeline transportation systems:
Part 1: Polyolefin coatings(3-layer PE and 3-layer PP)
Part 2: Fusion-bonded epoxy coatings
Part 3: Field joint coatings
Part 4: Polyethylene coatings (2-layer PE)
Part 5: External concrete coatings
Bitumen, asphalt and coaltar, liquid, thermal insulation, and epoxy polyamide powder coatings are to form the subjects of future parts 6, 7, 8 and 9.
Users of this part of ISO 21809 should be aware that further or differing requirements might be needed for individual applications. This part of ISO 21809 is not intended to inhibit a vendor from offering, or the purchaser from accepting, alternative equipment or engineering solutions for the individual application. This can be particularly applicable if there is innovative or developing technology. If an alternative is offered, the endor should identify any variations from this part of ISO 21809 and provide details.
1 Scope
This part of ISO 21809 specifies the requirements for qualification, application, testing and handling of materials for plant application of single-ayer fusion-bonded epoxy (FBE) coatings applied externally for the corrosion protection of bare steel pipe for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO 13623.
High-temperature coatings with a glass transition of above 120°C or FBE primer coatings for three-or multi- layer polyethylene or polypropylene coatings are not covered by this part of ISO 21809.
NOTE: Pipes coated in accordance with this part of ISO 21809 are considered suitable for additional protection by means of cathodic protection.
5 General requirements
5.1 Rounding
Unless otherwise stated in this part of SO 21809, to determine conformance with the specified requirements observed or calculated values shall be rounded to the nearest unit in the last right-hand place of figures used in expressing the limiting value, in accordance with ISO 31-0: 1992, Annex B, Rule A.