Decrease the Height of Hex Nut
Decrease the Height of Hex Nut
(OP)
During installation of a SS control valve it was found that the hex nut is in contact with the body of the control valve. This happened because an insulating gasket (i.e. dissimilar material and raw water service) is used in the flanged connection; thereby, it increased the bolt length causing the hex nut to clash with valve body. Now, is it possible to decrease the height of the hex nut (i.e. by grinding or machining, for example)? Does the industry code/standards allow this practice?





RE: Decrease the Height of Hex Nut
What temperature?
What dia valve?
What industry and to what reg's are you going to (try to) work at?
RE: Decrease the Height of Hex Nut
RE: Decrease the Height of Hex Nut
Also, just use a thinner insulating washer. A thick micarta washer with a steel washer on top is not your only choice. If you don't mind "hillbillying" it, cut some plastic washers from milk jugs. Verify their installation by testing for [lack of] continuity between the stud and flange.
RE: Decrease the Height of Hex Nut
Dan
www.eltronresearch.com
Dan's Blog
RE: Decrease the Height of Hex Nut
Dan
www.eltronresearch.com
Dan's Blog
RE: Decrease the Height of Hex Nut
RE: Decrease the Height of Hex Nut
RE: Decrease the Height of Hex Nut
RE: Decrease the Height of Hex Nut
Thank you for all the inputs.
RE: Decrease the Height of Hex Nut
The 1-thread minus it the maximum underengagement allowed during an on-stream inspection. And, yes, this implies that being 1 thread short of full engagement is inconsequential.