NPT threads
NPT threads
(OP)
We need to have 2 1/2" (8 pitch) NPT female threads in one of our components. The tapping is in a partially blind hole. (at the bottom of the thread there is a 1/2" opening)
1) What is the right procedure for drilling & tapping. Should we taper machine the hole before we machine. How to decide dimensions for this taper.
2) How many threads should be available in the component so that when a pipe nipple is installed it will seal effectively.
1) What is the right procedure for drilling & tapping. Should we taper machine the hole before we machine. How to decide dimensions for this taper.
2) How many threads should be available in the component so that when a pipe nipple is installed it will seal effectively.





RE: NPT threads
RE: NPT threads
http://bellsouthpwp.net/r/s/rsnmar/METhreads.zip
RE: NPT threads
On the tap you are saying we need not mchine any taper but just drill. Is it adequate?
RE: NPT threads
http://groups.google.com/groups?dq=&hl=en&lr=&ie=UTF-8&threadm=20030723022209.23307.00001579%40mb-m29.aol.com&prev=/groups%3Fhl%3Den%26lr%3D%26ie%3DUTF-8%26group%3Dalt.machines.cnc
RE: NPT threads
Why dont you try cutting a little off the end of your pipe. Since the threads are tapered it will take up faster. May be some trial and error.
RE: NPT threads
Good luck
RE: NPT threads
RE: NPT threads
Why not bore the 2-5/8" hole through as required for the pipe tap. Tap the hole as required.
Then weld in the disk with the 1/2" hole after all is done.
Or weld the disk into the pipe that going to be screwed into this tapped hole. The result would be the same.
pennpoint
RE: NPT threads
Something else to consider is - what are the service conditions? Any piping code considerations?
RE: NPT threads