quick question: do you know the differences between nh (nst), npt, and npsh (ipt) when it comes to fire hose threading? not understanding these differences can lead to mismatched parts, which leads to loss of money and time, not to mention plenty of frustration. we’re here to clear up some of the mystery and give you some great resources to keep handy for when you do need to purchase and match the right products. a hose coupling is a fire hose fitting that is located on the end of a hose. the key characteristics to understand with regard to proper thread attachment are size (3/4” to 6”), thread standard, and gender. the easiest way to identify what type of thread you need is by looking at the couplings on the fire hose you want to replace. there should be a stamp with the initials of the thread type. if you need to know what to use on a fire hydrant, call the local fire department. what initials should you use to identify the proper threading?
this is often referred to as “fire hose thread” because fire departments use it the most. garden hose thread (ght) is also referred to as nh. because these are not compatible with other thread types, fire hose thread adapters are used to connect the different types of couplings. npt stands for national pipe tapered and is mostly used in plumbing and industrial. npt is compatible with npsm threads if you choose male npt to female npsm (see below), whereas npt vs ght is not compatible. npsh stands for national pipe straight hose. npsh is a straight thread and is popular on low-pressure water suction and discharge hose couplings. keith was the president of rawhide fire hose from 2000 thru 2018. he is a former member of the wooster township fire department, serving with the wayne county underwater search and rescue unit. in addition to being an avid scuba diver with master diver endorsements he is also an instrument rated private pilot, certified for high performance and complex aircraft. easily configure the options for the hose type, diameter, color, length, and coupling!
fire hose adapters and fittings are likely some of the smallest products on those engines, but they play a role in reducing loads—and a crucial one in keeping firefighters ready for anything. and for the most part, different styles of thread aren’t interchangeable. male or female threads on fire hose fittings and adapters connect to corresponding inlets or outlets on firefighting equipment. these fittings have been popular on european fire hoses, hydrants, and other equipment for decades—and are now seeing increased use in the united states. when that happens, fire hose fittings and adapters give firefighters the opportunity to correct the problem without re-laying hose.
in an ideal world, there wouldn’t be any need to connect mismatched hoses on the fly, and all hydrants and hoses would have compatible couplings. this additional length, along with the hex-shaped protrusion, allows these nipples to reach through an opening in a swinging hose rack, holding an angle valve and a fire hose together. with the right size and thread—and a little creativity—it’s possible to join all sorts of equipment together, fast. for a standard fire hose that will be attached to a firefighting robot leading to internal pipes. once you know the threads and the hose size, you can make a decision from there. thanks for sharing these information with us.
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