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Edition and Publication:
< Natural Gas and Oil > Editorial Department
Hosted by:
China Petroleum Engineering & Construction Corporation Southwest Company
Authorized by:
China Petroleum Engineering & Construction Corporation
Co-hosted by:
Overseas Research Center of Research Institute of Petroleum Exploration and Development
Editor in Chief:
Du Tonglin
Vice Editor in Chief:
Tang Xiaoyong,Pu Liming
Address:
No.6, Shenghua Road, High-tech District, Chengdu, Sichuan, China
Postal Code:
610041
Tel:
028-86014709
028-86014500
Email:
cnpc-ngo@cnpc.com.cn
Issue:ISSN 1006-5539
CN 51-1183/TE

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Moulding Process for Pipe-in-Pipe of Polyurethane Insulation Pipe and its Quality Control

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Key Words： Large diameter； High density polyethylene casing pipe； Pipe-in-pipe； Insulated pipe； Quality control

Abstract：Directly berried insulated pipelines with large diameter are of underground facilities. After these pipelines are put into operation， their inspection and maintenance are very difficult and the costs for inspection and maintenance are also very high， so quality of the pipelines is one of the key factors affecting overall construction quality. In order to improve quality of the pipelines， combined with fabrication technology and actual fabrication process of pipe-in-pipes with large diameter and external high density polyethylene coating， taking 3-layer PE corrosion control coating for oil and gas pipelines as an example， described are construction of 3-layer PE corrosion control coating， fabrication of pipes with external high density polyethylene coating and polyurethane foaming plastic insulating layer， installation of tarpaulins and factory inspection of product pipes and put forward are considerations in fabrication process of insulated pipes with hard polyurethane foaming plastic insulating layer according to requirements in relative codes， standards and specifications， which can ensure quality of the insulated pipes as far as possible and ensure project quality accordingly.