1, Standard
ISO25311998(E), BSEN545-2002, GB13295-2003,
2, Tyron Type T Type Push-on joint, K Type Mechanical joint, NII Type Mechanical joint, Flange joint,
3, Flange nominal pressurePN10,PN16,PN25,PN40,
4, Main size
The size of fittings is DN40~2600,including T Type,K Type,N2 Type,Flange joint,
Main types of fittings
1, Flanged Spigot
2, Collar
3, Flanged Socket
4, Flanged Socket
5, Socket Spigot
6, Blank Flange
7, Double Socket Bend
8, Socket Spigot Bend
9, Double Flanged Bend
10, Double Socket Taper
11, Double Flanged Taper
12, Double Socket Tees with Flanged
13, All Flanged Tee
14, All Socket Tee
15, Socket and Spigot Tees With Socket Branch
16, Socket and Spigot Tees With Flanged Branch
17, Double Socket Level Invert Tees with Flanged Branch
18, Double Socket Level Invert Tee
19, All Socket Tee with 45 degree Angle Branch
20, All Flanged Tee with 45 degree Angle Branch
21, Double Flaned 90 degree Duckfoot Bend
22, Double Socket Off Set
23, All Flanged Cross
24, All Scoket Cross
25, Cap
26, Plug
27, Double Flanged Pipe
28, Flanged Adaptor
29, Coupling
30, Flange
5, Requirement of Material
5,1 Mechanical properties of Ductile iron
Tensile Strength | Elongation | Yield Strength | Hardness |
>=420MPa | >=5% | >=300MPa* | <=250HB |
* Yield Strength only be checked at the user or customs’ request,
5,2 Requirement of process properties
5,2,1, Hydrostatic testtest pressure and time
DN | Pressure | Test time |
<=300 | >=25Pa | >=15S |
350~600 | >=16 Pa | >=15S |
>=700 | >=10 Pa | >=10S |
5,2,2, Fittings for gas transportation should taken not only hydrostatic test ,but should taken Airtight test, the test pressure ≥4Pa,or at the concerned parties’ agreement,
6, Lining and Surface Coating
6,1 All fittings should be coating external and internal,Fittings for water transportation should be with cement mortar lining, Fittings for gas transportation should coated bitumen inside, External should coated rich zinc paint and bitumen paint,
6,2 Cement mortar lining thickness and tolerance
ductile iron fittings