NⅡ -type joint pipe from China manufacturer - HENAN WEIN INDUSTRY CO.,LTD.

Payment Terms:	L/C
Place of Origin:	, China (Mainland)


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Means of Transport: Ocean

NⅡ -type joint pipe for gas supply
All Pipes and fittings shall be subjected to a works hydrostatic test for a duration of at least 10 seconds

NⅡ -type joint pipe for gas supply

MECHANICAL PROPERTIES:

The mechanical properties of NⅡ -type joint pipe for gas supply shall be as shown in the table:

Type of Cast	Minimum Tensile strength	Minimum Elongation Percent After fracture, A		Hardness Max.(HB)
Type of Cast	DN80-2600	DN80-1000	DN1100-2600	Hardness Max.(HB)
Pipes centrifugally cast	420 MPa	10 %	7 %	230
Pipes not centrifugally cast, fittings and accessories	420 MPa	5 %	5 %	250
Note of NⅡ -type joint pipe for gas supply 1. By agreement between manufacturer and purchaser, the 0.2% proof stress may be measured. It shall be not less than 270 MPa when A ≥12% for DN60-1000 or 10% for DN > 1000. 2. For centrifugally cast pipes of DN60 to DN1000, the minimum elongation after fracture shall be 7% for thickness classes greater than K12

HYDROSTATIC TEST PRESSURE AT WORKS:

All Pipes and fittings shall be subjected to a works hydrostatic test for a duration of at least 10 seconds at the minimum internal test pressure given in the table.

DN (mm)	Minimum work test pressure (Bar)
	Pipes centrifugally cast		Pipes not centrifugally cast and fittings ¹⁾
	K<9	K≥9	All thickness classes
≤ DN300	0.5(k+1)²	50	25 ²⁾
350—600	0.5k²	40	16
700—1000	0.5(k-1)²	32	10
1200—2000	0.5(k-2)²	25	10
2200—2600	0.5(k-3)²	18	10
1).The works hydrostalic test pressure for fittings is less than that for pipes because the shape of fittings makes it difficult to provide sufficient restraint to high pressure during test. 2). 16 bar for pipes and fittings with PN10 flanges.