Threading and Drill size

NPT is an outdated standard that is for some reason still used to this day. There are many other methods of connecting fluid couplings that are far easier to produce and use. I can only surmise that a resistance to change of any kind is the underlying reason that it still exists at all.
In 1864 the origins of NPT began.
 
Hi Guys,

Doesn't code require that if you are working on pipe that uses tapered threads, you are required to replace fittings like for like.
 
NPT is an outdated standard that is for some reason still used to this day. There are many other methods of connecting fluid couplings that are far easier to produce and use. I can only surmise that a resistance to change of any kind is the underlying reason that it still exists at all.
In 1864 the origins of NPT began.

Interesting, in the middle of a Civil War, we come up with pipe threads. I find that interesting.
The wheels of progress never stop.
 
NPT is still in use because it works. Most piping systems are built to not be taken apart and will never have a problem. It's when you have to make a repair that you often run into problems. It only takes a small nudge or a slight twist in the wrong direction to loosen a fitting and cause a leak. (and 50% of the time you'll be turning in the wrong direction)
 
Horse drawn carriages will deliver a product to the retailer.
Few use this method in 2018 (-:
 
One other thing to consider, To properly tap a female thread for pipe, the hole must be tapered, not straight. Tapered reamers are available to accomplish this.
 
Horse drawn carriages will deliver a product to the retailer.
Few use this method in 2018 (-:
Just about 100% of the USA is plumbed with NPT plumbing. Agricultural, domestic, industrial, and utilities. It does an excellent job of delivering products by using pipes. Replacing all that infrastructure will be an immense undertaking, and will not likely add more reliability. Yet, it is being replaced in some applications already as improved systems emerge, and will continue.
 
Pipe threads are definitely not suited for a survival knife. The torque required to seal the threads is too high for bare hands. Ask me how I know.
 
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