GB/T 29047-2012 Prefabricated directly buried insulating pipes and fittings with polyurethane [PUR] foamed-plastics and high density polyethylene [PE] casing pipes (Text of Document is in English) - Beijing translation compay

Contents
Foreword
Introduction
1. Scope
2. Normative references
3. Terms and Definitions
4. Product Structure
5. Requirement
5.1 Working steel tube
5.3 The External Protecting Pipe
5.4 The Insulating Layer
5.5 Insulating Pipe
5.6 Insulating Pipe Fitting
5.7 Insulating Joint
6. Test Method
7. Inspection Rule
7.1 Inspection Classification
7.2 Delivery Inspection
7.3 Type Inspection
8. Marking, Transportation and Storage
8.1 Marking
8.2 Transportation
8.3 Storage
Annex A (Normative) Actual continuous working conditions and accelerated aging test conditions
Annex B (Normative) Shortest life expectancy of polyurethane foam working under different temperature
Annex C (Normative) The requirement and test of thermal insulation pipe long-term continuously operating between temperature of 120℃~140℃
Annex D (Informative) External protecting pipe welding guide
Bibliography