Standard No.:	GB/T 38105-2019
English Name:	Urban heating—Steel jacket prefabricated directly buried pipes and fittings with vacuum insulating layers
Chinese Name:	城镇供热 钢外护管真空复合保温预制直埋管及管件
Chinese Classification:	P46    Heat supply and heating engineering
Professional Classification:	GB    National Standard
ICS Classification:	91.140.10 91.140.10    Central heating systems 91.140.10
Issued by:	SAMR and SAC
Issued on:	2019-10-18
Implemented on:	2020-9-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	10500 words
Price(USD):	310.0
Delivery:	via email in 1 business day

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