China Custom Sizes Water Pressure Test Bitumen Coating ISO2531 En545 En598 Class k7 k9 Ductile Iron Pipe Weight

Nominal
Size
DN

Minimum tensile
strength, Rm
Mpa

Minimum 0.2%
proof stress, Rp0.2
Mpa

Minimum elongation
after fracture,A
%

Hardness

HB

80-1000

≥420

≥300

≥10

≤230

1100-2600

≥7

Note:
1. By agreement between manufacture and purchaser, the 0.2% proof stress (Rp0.2) may be measured.
It shall be not less than:
· 270 MPa when A≥12% for DN 40 to DN 1000 or A≥10% for DN ＞1000;
· 300 MPa in other cases.
2. DN 40 to DN 1000, the minimum elongation after fracture shall be 7% for thickness classes over K12.

Nominal Size(DN)

Hydrostatic works test pressure (bar)

80-300

50

350-600

40

700-1000

32

1200-2000

25

2200-2600

18

DN

Nominal value

Tolerance 1)

Maximum crack width and radial displacement

80-300

4

-1.5

0.4

350-600

5

-2

0.5

700-1200

6

-2.5

0.6

1400-2000

9

-3

0.8

1）A negative tolerance only is given.
Note: Pipe end may have a chamfer of maximum length 50 mm.

External coatings

Internal coating(linings)

Coating of the joint area

- Metallic zinc with finishing layer, in accordance with ISO 8179-1;
- Zinc rich paint with finishing layer, in accordance with ISO 8179-2;
- Epoxy coating, in accordance with EN 14901;
- Polyethylene sleeve, in accordance with ISO 8180;
- Alloy of zinc and aluminum with or without other metals, having a minimum mass of 400 g/m2, with finishing layer;
- Extruded polyethylene coating in accordance with EN 14628;
- Polyurethane coating in accordance with EN 15189;
- Cement mortar coating in accordance with EN 15542;
- Adhesive tape;

- Portland/Blast furnace slag/Sulphate/ High Aluminum Cement Mortar, in accordance with ISO 4179;
- Cement mortar lining with seal coat, in accordance with ISO 16132;
- Epoxy coating, in accordance with EN 14901;
- Polyurethane lining in accordance with EN 15655;

- Epoxy coating;
- Polyurethane coating.