Technical specification of joint assembling for directly buried insulated pipeline of urban heating
1 Scope
This standard specifies the terms and definitions, classification and applicable conditions, on-site processing, requirements, test methods, inspection rules, marking, transportation, and storage of the joint assembling for directly buried insulated pipeline of urban heating.
This standard is applicable to the joint assembling of prefabricated directly buried hot water insulating pipes (hereinafter referred to as hot water pipes) with a medium design pressure less than or equal to 2.5 MPa, medium temperature less than or equal to 120°C, and occasional peak temperature less than or equal to 140°C, as well as the joint assembling of steel casing pipe prefabricated directly buried steam insulating pipes (hereinafter referred to as steam pipes) with the medium temperature less than or equal to 350°C.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 8923.1-2011 Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings
GB/T 13350 Glass wool and its products for thermal insulation
GB/T 23257 Polyethylene coating for buried steel pipeline
GB/T 29046 Test methods of technical specification for pre-insulated directly buried district heating pipes
GB/T 29047 Prefabricated directly buried insulating pipes and fittings with polyurethane foamed-plastics and high density polyethylene casing pipes
GB/T 34336 Reinforced nanoporous aerogel products for thermal insulation
GB/T 38105 Urban heating - Steel jacket prefabricated directly buried pipes and fittings with vacuum insulating layers
CJJ/T 104 Technical specification for directly buried steam heating pipeline in city
CJJ/T 254 Technical specification for leakage surveillance system of directly buried heating pipe
CJ/T 246 Preformed directly buried steam insulating pipes and fittings for urban heating
NB/T 47013.3-2015 Nondestructive testing of pressure equipment - Part 3: Ultrasonic testing
SY/T 0063 Test method for leakage detection of pipeline anti-corrosion coating
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
joint assembling
processing of filling insulating materials between the joint out casings to form an insulating structure after connecting adjacent pipelines and pipelines, pipelines and fittings, fittings and fittings
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and applicable conditions
5 On-site processing
6 Requirements
7 Test methods
8 Inspection rules
9 Marking, transportation and storage
