High Pressure High Temperature Bolting
High Pressure High Temperature Bolting
(OP)
Hello,
I need to select suitable bolting material for bonnet studs / Nuts of a High Pressure valve. Following are the specification:
Valve body / Bonnet material : ASTM A182 Grade F91
Body design Condition: Class 2500
Maximum Operating pressure: 220 barg
Maximum Working temperature: 610°C
Application: Condensate, Steam
I need to know if it is okay to use UNS N07718 (ASTM B637) bolting with F91 valve body at the specified design conditions. Would there be any issues like galling, galvanic corrosion etc.
Do we have any other high strength bolting material options for use with F91 valve bodies?
Thanks in advance.
I need to select suitable bolting material for bonnet studs / Nuts of a High Pressure valve. Following are the specification:
Valve body / Bonnet material : ASTM A182 Grade F91
Body design Condition: Class 2500
Maximum Operating pressure: 220 barg
Maximum Working temperature: 610°C
Application: Condensate, Steam
I need to know if it is okay to use UNS N07718 (ASTM B637) bolting with F91 valve body at the specified design conditions. Would there be any issues like galling, galvanic corrosion etc.
Do we have any other high strength bolting material options for use with F91 valve bodies?
Thanks in advance.





RE: High Pressure High Temperature Bolting
Not sure on galling issues, you may find this topic useful.
Whats your design code?
RE: High Pressure High Temperature Bolting
To answer your query on design code: Since these valves are integral to trap module,the applicable design codes are ASME B31.1 / ASME SEC VIII div I.
RE: High Pressure High Temperature Bolting
RE: High Pressure High Temperature Bolting
A193 Gr B16 / A194 gr 4 bolting combination has much lower strength values at high temperatures as compared to ASTM B637; which results in higher bolt diameters for the same application. Hence I'm more interested in ASTM B637.
Thanks.