SAE Grade 8 Bolting in low temperature service
SAE Grade 8 Bolting in low temperature service
(OP)
I have 4000 bronze bodied three piece ball valves with Grade 8 bolting. The manufacturer has rated the valves to -20 F service conditions.
I am using the valves at 1/3rd the rated valve pressure and want to know how I can justify a lower working temperature based on the lower working pressure I am using the valves in.
I do not want to change out all 4000 valves with SS bolting if I can help it.
Can someone show me a method to rate Grade 8 bolts to temperatures of -30 F. The bolt sizes wre 5/16" to 1/2"
I am using the valves at 1/3rd the rated valve pressure and want to know how I can justify a lower working temperature based on the lower working pressure I am using the valves in.
I do not want to change out all 4000 valves with SS bolting if I can help it.
Can someone show me a method to rate Grade 8 bolts to temperatures of -30 F. The bolt sizes wre 5/16" to 1/2"





RE: SAE Grade 8 Bolting in low temperature service
Also, you can't just replace the bolting; you also need to verify that the valve themselves will withstand the lower temperature.
I suggest contacting the manufacturer and asking about the servicibility of the valves at the temperatures you need.
Patricia Lougheed
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