Urban heating - Steel jacket prefabricated directly buried pipes and fittings with vacuum insulating layers
1 Scope
This standard specifies the terms and definitions, structure, materials and properties, requirements, test methods, inspection rules, marking, transportation, and storage of steel jacket prefabricated directly buried pipes and fittings with vacuum insulating layers.
This standard is applicable to the steel jacket prefabricated directly buried pipes and fittings with vacuum insulating layers with working pressure of heating medium less than or equal to 2.5 MPa and the design temperature less than or equal to 350°C (steam) or design temperature less than or equal to 200°C (hot water) (hereinafter referred to as “thermal insulation pipes and fittings") .
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 699 Quality carbon structure steels
GB/T 700 Carbon structural steels
GB/T 3091 Welded steel pipes for low pressure liquid delivery
GB/T 8163 Seamless steel pipes for liquid service
GB/T 8923.1 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 9711 Petroleum and natural gas industries - Steel pipe for pipeline transportation systems
GB/T 12459 Steel buttwelding pipe fittings - Types and parameter
GB/T 13350 Glass wool and its products for thermal insulation
GB/T 13401 Steel buttwelding pipe fittings - Technical specification
GB/T 23257 Polyethylene coating for buried steel pipeline
GB/T 28638-2012 Heat loss test for thermal insulation structure and evaluation methods for thermal insulation efficiency of district heating pipes
GB/T 29046-2012 Test methods of technical specification for pre-insulated directly buried district heating pipes
GB/T 34336 Reinforced nanoporous aerogel products for thermal insulation
CJJ 28 Code for construction and acceptance of city heating pipelines
CJJ/T 104-2014 Technical specification for directly buried steam heating pipeline in city
HG/T 3831 Spray polyurea for materials protection
NB/T 47013.2 Nondestructive testing of pressure equipment - Part 2: Radiographic testing
NB/T 47013.3 Nondestructive testing of pressure equipment - Part 3: Ultrasonic testing
NB/T 47013.5 Nondestructive testing of pressure equipments - Part 5: Penetrant testing
SY/T 0063 Test method for leakage detection of pipeline anti-corrosion coating
SY/T 0315 Technological specification of external fusion bonded epoxy coating for steel pipeline
SY/T 5037 Submerged arc-welded steel pipe for common fluid service pipeline
SY/T 5257 Steel bends for oil and gas transmission
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 inside sliding support
pipe support which makes the working steel pipe and the steel jacket have relative axial and lateral displacement in the thermal insulation pipe
3.2 inside guiding support
pipe support which makes the working steel pipe and the steel jacket have relative axial displacement in the thermal insulation pipe
3.3 vacuum layer
air layer with a certain degree of vacuum, which is sealed between the outer surface of the insulation material layer and the inner surface of the steel jacket
3.4 inside fixed support
pipeline fittings that prevent relative displacement between working steel pipe and steel jacket
3.5 outside fixed support
pipeline fittings that prevent relative displacement between steel jacket and fixed pier
3.6 inside and outside fixed support
pipeline fittings that prevent relative displacement among working steel pipe, steel jacket and fixed pier
3.7 insulation layer
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Structure
4.1 Thermal insulation pipe
4.2 Thermal insulation fittings
5 Material and properties
6 Requirements
6.1 Working steel pipe
6.2 Steel fitting
6.3 Heat preservation layer
6.4 Vacuum layer
6.5 Steel jacket
6.6 Anti-corrosive coating
6.7 Thermal insulation pipe
6.8 Thermal insulation fittings
7 Test methods
7.1 Working steel pipe
7.2 Steel fitting
7.3 Heat preservation layer
7.4 Vacuum layer
7.5 Steel jacket
7.6 Anti-corrosive coating
7.7 Thermal insulation pipe
7.8 Thermal insulation fittings
8 Inspection rules
8.1 End-of-manufacturing inspection
8.2 Type inspection
9 Marking, transportation and storage
9.1 Marking
9.2 Transportation
9.3 Storage
Annex A (Normative) Thermal insulation joint
Annex B (Informative) Design, realization and maintenance of vacuum system
