Lap-Joint Flange

LAP JOINT FLANGES are primarily employed with lap joint stubs, the combined initial cost of the two items being approximately one-third higher than that of comparable welding neck flanges. Their pressure-holding ability is little, if any, better than that of slip-on flanges and the fatigue life of the assembly is only one-tenth that of welding neck flanges. The chief use of lap joint flanges in carbon or low alloy steel piping systems is in services necessitating frequent dismantling for inspection and cleaning and where the ability to swivel flanges and to align bolt holes materially simplifies the erection of large diameter or unusually stiff piping. Their use at points where severe bending stress occurs should be avoided
 
 
Specification: 
Manufacturing standards: ANSI B 16.5, BS 1560. BS 10, IS 6392, B-2.1 NPT, API, DIN, JIS. MSS SP 44
Stainless Steel: ASTM A182 F304/ 304L/ 304H/ 316/ 316L/ 317/ 317L/ 321/ 310/ 347/ 904Letc.

Duplex Stainless Steel: UNS S31803, 2205 
Carbon Steel: ASTM A105/ A694 F42/ 46/52/56/60/65/70/A350 LF3/A350 LF2, etc.
Alloy Steel: ASTM A 182, GR F1, F11, F22, F5, F9, F91 
Size: 1/8" NB to 48"NB 
Class: 150, 300, 400, 600, 900, 1500 & 2500
The surface forms: according to customer requirements

 

密封面型式 公称压力PN/MPa
(bar)
0.6
(6)
 1.0
(10)
1.6
(16) 
2.5
(25)
 4.0
(40)
突面(RF)   DN10-600

 

 

密封面型式 公称压力PN (MPa)
(Class)
2.0
Class 150
5.0
Class 300
11.0
Class 600
15.0
Class 900
26.0
Class 1500
42.0
Class 2500
突面(RF) DN15-600
(1/2"-24")
DN15-300
(1/2"-12")
环连接面(RJ)