How to tighten npt fittings step 1. Do not cross the threads at this stage.
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How to tighten npt fittings. Turn the male pipe thread in a clockwise direction. Tfft assembly turns from finger tight with pipe thread sealant or teflon tape applied. This allows some lee way to get the fitting pointing in the right direction. More turns will put to much pressure on the fitting and may crack it and cause a leak. I have rarely used npt threads i am in a part of europe where parallel fittings are used but now i had to install some 12 npt threaded male adapter to 12 npt female valves. If you remember which way you have to turn the fitting you will avoid a bad seal or plumbing fittings that are potentially stripped.
How tight do you have to tighten national pipe thread. Damage to the threads or even a cracked port end which can lead to leaks and make re use imp ossible. I have a question for experienced thread fitters. At this point you can use a wrench to complete one or two more turns. Continue to turn the male pipe fitting in a clockwise direction until you can no longer. The tensile stress created by tightening the fitting beyond hand tight and 1 or 2 more turns will crack the female fittings.
Put on a specific length of thread tape and tighten up the fitting. Do not tighten your fitting past this point. Maybe the solution is to just carry on as you are but keep a 14 npt tap handy when you come to install the valve into the tank. Youll develop a feel for it. They should be hand tightened and then another 1 or 2 turns but no more. However after wrench tightening the adapter i see some sort of thin metal scrap coming out of the thread.
I usually tighten npt threads by hand as tight as i can then use a wrench to tighten up to 1 or 1 12 turns more. It is a common mistake that can easily be avoided. When you put in a screw turning it to the left loosens the screw and turning it to the right tightens it. Insert the male thread into the female fitting. Brass and steel pipe thread npt installation procedure and torque specification table and chart. Thats why tfft rather than torque is recommended for tapered.
More than any other fitting they are prone to damage due to over tightening. Due to the shape of tapered thread fittings its particularly important that they never be over tig h t ened. The same thing applies to plumbing fittings. Once the pieces are together tighten the connection by hand slowly until the fitting will not turn any more.
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