+++ Стандарты ISO 4 шт

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Уважаемые коллеги!

Буду признателен, если поможете найти следующие стандарты:

(1) ISO 21809-1:2018
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)
https://www.iso.org/standard/65345.html
(2) ISO 21809-3:2016
Petroleum and natural gas industries -- External coatings for buried or submerged pipelines used in pipeline transportation systems -- Part 3: Field joint coatings
https://www.iso.org/ru/standard/61002.html
(3) ISO 21809-4:2009
Petroleum and natural gas industries -- External coatings for buried or submerged pipelines used in pipeline transportation systems -- Part 4: Polyethylene coatings (2-layer PE)
https://www.iso.org/standard/39074.html
(4) ISO 21809-5:2017
Petroleum and natural gas industries -- External coatings for buried or submerged pipelines used in pipeline transportation systems -- Part 5: External concrete coatings
https://www.iso.org/standard/68378.html

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