Ductile pipe procurement technical requirements 1)
Product quality of the finished product ISO6892 metal material tensile test.
ISO6506 metal materials -
Hardness test -
Brinell hardness test.
ISO4179 pressure pipeline with nodular cast
iron pipe -
Centrifugal cement mortar lining.
Zinc coating ISO8179 nodular cast iron pipe.
2004 standard 2)
Piping is T socket type, since the anchor interfaces rubber sealing ring.
Pipe and pipe fittings standard wall thickness e = k (
5 + 0.
Among them: e -
The standard wall thickness, mm;
Mm: nominal diameter;
Straight take 9 K.
T take 14 K, the other 12 K.
The quality of pipes, pipe fittings: after casting
by appropriate heat treatment to meet the requirements of mechanical properties, the pipe should be able to cutting, drilling and machining.
Interface of tolerance: to ensure the interchangeability of pipes and pipe fittings, pipes and pipe fittings on the pin end diameter tolerance should not be greater than 1 mm.
Straightness: when the pipe is about two-thirds length of distance between two roll to check on the bench, the maximum deviation FM pipe should not be greater than the effective length L of 0.
FM (125%, namely:
Mechanical properties:, the mechanical properties of ductile iron pipes in accordance with GB/T13295 standards: tensile strength of 420 n/p was, bending strength 590 n/p was, elongation 10% or higher;
Pipe mechanical properties conform to the standard GB/T13295 regulation: tensile strength 400 n/p was, elongation of 5% or higher.
Chemical composition: the phosphorus content of ductile iron pipe shall not be greater than zero.
05%, sulfur content shall not be greater than zero.
Hydrostatic test (1) ductile iron pipes one by one for hydrostatic test before coating, the experimental pressure values match GB13295 -
(2) ductile iron pipe coating before carry on the water pressure experiment, the experimental pressure values match GB13295 -
Socket must do antirust processing.
Tags: each pipe, pipe fittings and accessories has the following tag: a)
C) nominal diameter
The production batch number (
The serial number)
Wall thickness: rank (
K9 wall thickness (
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in cast iron company and is expected to reach a market value of cast iron company by cast iron company, with a CAGR of cast iron company during the forecast period.
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