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| Quantity: | |
|---|---|
BL Flange
SDFL
| Nominal Size | Outer Diameter | Central circle diameter | Bolt Hole Diameter | Number of Bolt Holes | Flange Ring Height | Sealing Face Diameter | Sealing Face Height | |
| DN | NPS | A | J | I | G | |||
| 15 | 1/2 | 133.4 | 88.9 | 22.4 | 4 | 30.2 | 35.1 | 6.4 |
| 20 | 3/4 | 139.7 | 95.3 | 22.4 | 4 | 31.7 | 42.9 | 6.4 |
| 25 | 1 | 158.8 | 108 | 25.4 | 4 | 35.1 | 50.8 | 6.4 |
| 32 | 1-1/4 | 184.2 | 130 | 28.4 | 4 | 38.1 | 63.5 | 6.4 |
| 40 | 1-1/2 | 203.2 | 146.1 | 31.8 | 4 | 44.5 | 73.15 | 6.4 |
| 50 | 2 | 235 | 171.5 | 28.4 | 8 | 50.8 | 91.9 | 6.4 |
| 65 | 2-1/2 | 266.7 | 196.9 | 31.8 | 8 | 57.15 | 104.6 | 6.4 |
| 80 | 3 | 304.8 | 228.6 | 35.1 | 8 | 66.55 | 127 | 6.4 |
| 100 | 4 | 355.6 | 273.1 | 41.1 | 8 | 76.2 | 157.2 | 6.4 |
| 125 | 5 | 419.1 | 323.9 | 47.9 | 8 | 91.9 | 185.7 | 6.4 |
| 150 | 6 | 482.6 | 368.3 | 53.8 | 8 | 108 | 215.9 | 6.4 |
| 200 | 8 | 552.5 | 438.2 | 53.8 | 12 | 127 | 269.7 | 6.4 |
| 250 | 10 | 673.1 | 539.8 | 66.6 | 12 | 165.1 | 323.9 | 6.4 |
| 300 | 12 | 762 | 619.3 | 73.2 | 12 | 184.2 | 381 | 6.4 |
Industry specific scenarios
High pressure oil and gas gathering and transmission pipelines, wellhead equipment, and ultra-low temperature pipelines for LNG receiving stations.
Chemical high-pressure reactor, polymerization unit, corrosive medium storage tank.
Main steam pipeline and high-temperature reheating system of power plant boiler.
High pressure fuel pipelines for ships, liquefied gas transport ships (requiring low-temperature tough materials).
System type, operating condition parameters, blind flange requirements
High pressure natural gas pipeline pressure: 25 MPa, temperature: -30~50 ° C Material: A350 LF3 (low temperature toughness), sealing surface: RTJ, bolt: A193 B7M (sulfur stress cracking resistance).
Ethylene cracking unit pressure: 22 MPa, temperature: 300 ° C Material: A182 F316L (high temperature corrosion resistant), gasket: stainless steel wrapped gasket+flexible graphite.
The main steam pipe pressure of the power station is 26 MPa, temperature is 600 ° C, material is A182 F91 (9Cr-1Mo-V), and post weld heat treatment (PWHT) is required to eliminate stress.
