What are the requirements for the pressure vessel flange connection screw?
There is a bolt nut ASME B16.5 with class400
Cannot take ordinary bolts bolts (low pressure) to connect because of work environment factors, because the average bolted flange, changes in temperature and pressure in engineering, due to the common bolt used A3 steel or low carbon steel, the temperature and stress of the pressure change is very easy to cause bolt looseness and produce leaks, but using high pressure bolt will not appear this kind of circumstance, it will change accordingly, along with the change of temperature and pressure in short because the material is different. 2.5 MP is low pressure, 6.4 MP is medium voltage The pressure vessel flange shall be connected by a high pressure bolt (double head screw), and no ordinary bolts shall be used to connect. And in high pressure must have A level difference between bolt and nut, bolt than matching nut namely it is above material to A higher level, such as use 25 MoV A bolt, nut is used 20 MoV A low A level. The flange face must be a common female and use a steel washer, a graphite insert, or a graphite washer.
Pressure vessel flange connection screw requirements: Cannot take ordinary bolts bolts (low pressure) to connect because of work environment factors, because the average bolted flange, changes in temperature and pressure in engineering, due to the common bolt used A3 steel or low carbon steel, the temperature and stress of the pressure change is very easy to cause bolt looseness and produce leaks, but using high pressure bolt will not appear this kind of circumstance, it will change accordingly, along with the change of temperature and pressure in short because the material is different. 2.5 MP belongs to low pressure, 6.4 MP belong to medium pressure pressure pressure vessel flange to be used to connect with high voltage bolt (double head screw), can not take ordinary bolt to connect. And in high pressure must have A level difference between bolt and nut, bolt than matching nut namely it is above material to A higher level, such as use 25 MoV A bolt, nut is used 20 MoV A low A level.
To see the specific pressure, 2.5 MPa is going to use a double head high strength bolt,
