JB/T 7870-1997Thin-walled metal pipes and fittings for sprinkler irrigation (English PDF)
喷灌用金属薄壁管及管件
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
January 1, 1997
Implementation date
January 1, 1997
Scope
JB/T 7870-1997 is the English-translated version of 喷灌用金属薄壁管及管件.
JB/T 7870-1997 is the Chinese standard "Thin-walled metal pipes and fittings for sprinkler irrigation". Its scope clause reads: This standard specifies the varieties, sizes, technical requirements, test methods, inspection rules, marking and packaging of thin-walled metal pipes and fittings for sprinkling irrigation.
It applies to galvanized thin-walled steel pipe and thin-walled aluminium and aluminium alloy pipe for sprinkling irrigation, and to the various fittings that go with them.
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Document preview — JB/T 7870-1997
National Standard of the People's Republic of China
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- 1 Scope
- 2 Normative references
- 3 Varieties and sizes
1 Scope
This standard specifies the varieties, sizes, technical requirements, test methods, inspection rules, marking and packaging of thin-walled metal pipes and fittings for sprinkling irrigation.
It applies to galvanized thin-walled steel pipe and thin-walled aluminium and aluminium alloy pipe for sprinkling irrigation, and to the various fittings that go with them.
This standard is a revision of JB/T 7869.2-95 (formerly GB 5895-86), JB/T 7870-95 (formerly GB 5896-86) and JB/T 7869.1-95 (formerly GB 5897-86), the three standards being combined into one. The content of those standards that still applied was retained, and the following main changes were made: the requirements for resistance to water pressure and the corresponding test methods were adjusted; a method for calculating friction head loss was added; the inspection rules were revised; Annex C of JB/T 7869.2-95, "Test report and forms", was deleted; technical requirements that are for the manufacturer to lay down were removed; and the layout and wording were brought into line with GB/T 1.1-1993. Annex A and Annex B are normative.
2 Normative references
The provisions contained in the following standards become provisions of this standard through reference in this standard. The editions shown were valid at the time of publication of this standard. All standards are subject to revision, and the parties using this standard should consider the possibility of applying the latest editions of the standards listed below.
GB 228-87 Metallic materials - Tensile testing
GB 242-82 Metal tubes - Flaring test
GB 246-82 Metal tubes - Flattening test
GB 700-88 Carbon structural steel
GB 708-88 Dimensions, shape and permissible deviations of cold-rolled steel plate and strip
GB 1173-86 Specification for cast aluminium alloys
GB 2102-88 Acceptance, packaging, marking and quality certificate of steel tubes
GB 2828-87 Sampling procedures and tables for lot-by-lot inspection by attributes (applicable to inspection of continuous lots)
GB 3091-82 Galvanized welded steel pipe for low-pressure fluid conveyance
GB 3190-82 Chemical composition of wrought aluminium and aluminium alloy products
GB 5213-85 Cold-rolled deep-drawing steel sheet and strip
GB 6893-86 Drawn (rolled) aluminium and aluminium alloy tube for industrial use
JB/T 5673-91 General specifications for the painting of agricultural and forestry tractors and machinery
HG 4-329-66 Sealing rubber products (rings)
3 Varieties and sizes
3.1 Classes of thin-walled metal pipe
Thin-walled metal pipes are divided into: galvanized thin-walled steel pipe, nominal pressure 1 000 kPa; and thin-walled aluminium (aluminium alloy) pipe, nominal pressure 800 kPa.
3.2 Sizes and permissible deviations of thin-walled metal pipe
The sizes of thin-walled metal pipe and their permissible deviations shall comply with Table 1. Nominal outside diameters run from 32 mm to 160 mm; the permissible deviation on outside diameter is ±1 % of D for galvanized thin-walled steel pipe, and the permissible deviation on wall thickness is +12 % to -15 % of S.
3.3 Sizes of fittings
The size of a fitting is designated by the nominal outside diameter of the thin-walled metal pipe it fits; a reducer is designated by the nominal outside diameter of the pipe fitting its larger end. Fitting sizes shall comply with Table 2.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB 3100-1982SI units and recommendations for the use of their multiples and of certain other units
- JB/T 5673-1991Tractors and machinery for agriculture and forestry - Painting - General technical requirements
GB 228-1987 · GB 242-1982 · GB 246-1982.GB 700-1988 · GB 708-1988 · GB 1173-1986 · GB 2102-1988 · GB 2828-1987 · GB 3091-1982 · GB 5213-1985 · GB 6893-1986 · HG 4-329-66
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