Flange

FLANGE
CARBON STEEL & STAINLESS STEEL
Dimensional Tolerance B16.5-2003
Threaded, Socket-Welding, Slip-On, LapJoint and Blind Weld Neck
Outside Diameter (1)when the O.D. is 24" or less± 1/6" Outside Diameter (1)when the O.D. is 24" or less± 1/6"
when the O.D. is  over 24"± 1/8" when Huub Base is over 24"± 1/8"
Inside DiameterThreaded Socket-Weldingwithin limites on boring gauge Inside Diameter≤10"                12"through 18"±3/32"                              ± 1/16"
Slip-On and Lap-Joint≤ 10" + 1/32",-0"        ≤12"+ 1/16", 0 " ≤20"₊1/8"                                    -1/16"
Outside Diameter  of Hub(1)≤ 12"₊ 3/32"
₋ 1/16"
 Diameter of Contact Face1/16" raised Face±3/32"
≤ 14"± 1/8" 1/4" Raised Face Tongue & Groove  Male, Famale± 1/64"
Diameter of Contact Face1/16" Raised Face     1/4" raised Face± 1/32"  Diameter  of Hub at Base(1)when Hub Base is 24" or less± 1/16"
Tongue & Groove Male, Famale± 1/64" when the O.D. is  over 24"± 1/8"
Diameter of  CounterboreSame as for Inside Diameter Diameter of  Hub at Point of WeldingNPS≤5"±3/32"                              ± 1/32"
 NPS≥6"±5/32"                              ± 1/32"
DrillingBolt Circle± 1/16" DrillingBolt Circle± 1/16"
Bolt Hole Spacing± 1/32" Bolt Hole Spacing± 1/32"
Concentricity of Bolt Circle with Respect to FacingNPS ≤ 2-1/2"               1/32" max Concentricity of Bolt Circle with Respect to FacingNPS ≤ 2-1/2"               1/32" max
NPS ≤ 3"
1/16" max
 NPS ≤ 3"               1/16" max
Thickness≤ 18"₊1/8" , ₋0" Thickness≤ 18"₊1/8" , ₋0"
≥ 20"₊3/16" , ₋0" ≥ 20"₊3/16" , ₋0"
Length Through the Hub (1)≤ 18"₊1/8" , 1/32" Length Through the HubNPS≤ 4"± 1/16"
≥ 20"₊3/16" ,1/16" 5"≤NPS≤10"±1/16" , ₋1/8"
 ≥ 12"₊1/8" ,-3/16"
FLANGE
CARBON STEEL&STAINLESS STEEL
Pressure-Temperature Ratings for ASTM Group 2-1.1 Materials
Working Pressure by Classes,BAR
Temp.°C15030040060090015002500
-29 to 3819.651.168.1102.1153.2255.3425.5
5019.250.166.8100.2150.4250.6417.7
10017.746.662.193.2139.8233388.3
15015.845.160.190.2135.2225.4375.6
20013.843.858.487.6131.4219365
25012.141.955.983.9125.8209.7349.5
30010.239.853.179.6119.5199.1331.8
3259.338.751.677.4116.1193.6322.6
3508.437.650.175.1112.7187.8313
3757.436.448.572.7109.1181.8303.1
4006.534.746.369.4104.2173.6289.3
4255.528.838.457.586.3143.8239.7
4504.62330.74669115191.7
4753.717.423.234.952.387.2145.3
5002.811.815.723.535.358.897.9
5381.45.97.911.817.729.549.2
Pressure- Temperature Ratings for ASTM Group 2-1.2 Materials
Working Pressure by Classes,BAR
Temp.°C15030040060090015002500
-29 to 3815.941.455.282.7124.1206.8344.7
5015.34053.480120.1200.1333.5
10013.334.846.469.6104.4173.9289.9
1501231.441.962.894.2157261.6
20011.229.238.958.387.5145.8243
25010.527.536.654.982.4137.3228.9
3001026.134.852.178.2130.3217.2
3259.325.5345176.4127.4212.3
3508.425.133.450.175.2125.4208.9
3757.424.83349.574.3123.8206.3
4006.524.332.448.672.9125.5202.5
4255.523.931.847.771.6119.3198.8
4504.623.431.246.870.2117.1195.1
FLANGE
CARBON STEEL & STAINLESS STEEL
Types of FlangesSpecial Flanges
The most used flange types in Petro & chemical industry are:
.Welding Neck Flange
.Slip On Flange
.Socket Weld Flange
.Lap Joint Flange
.Threaded Flange
.Blind Flange
All types except the Lap Joint flange are provided
With a raised flange face
Except the most used standard flanges,there are still a number of special flanges such as:
.Orifice Flanges
.long Welding Neck Flanges
.Weldoflange I Nipoflange
.Expander Flange
.Reducing
ASTM Group 2-1.1 Materials ASTM Group 2-2.3 Materials
Nominal
Designation
ForgingsPlates Nominal
Designation
ForgingsPlates
C-SiA105(1)A515
Gr.70(1)
 16Cr-12Ni-2MoA182
Gr.f316L
A240
Gr.316L
C-Mn-SiA350
Gr.LF2(1)
A516
Gr.70(1),(2)
 18Cr-13Ni-3MoA182
Gr.F317L
  -
C-Mn-Si-VA350
Gr.LF6 CI 1(3)
A537
CI.1(4)
 18Cr-8NiA182
Gr.F304L(1)
A240
Gr.304L(1)
C31/2 NiA350
Gr.LF3
  - 18Cr-81MoGr.321A240
Gr.321
NOTES
.(1) Upon prolonged exposure to temperatures above ◦425C,the carbide phase of steel may be converted to graphite. Permissible but not recommended for prolonged use above ◦425C.
.  (2)Do not use over ◦455C.
.  (3)Do not use over ◦260C.
.  (4)Do not use over ◦370C.
 NOTE
. (1) DO not use over ◦425C