NPT threads are tapered with published maximum insertion depths to provide adequate joining strength and yet prevent splitting the fitting that the pipe is being threaded into. Monitoring the torque is not a reliable method for determining the induced hoop stress as it varies depending on how...
What ccfowler is talking about is a "vortex breaker". The description he gives is correct and I suspect your problems will go away once it is installed on the pump suction. These are standard on the pump suction to water disposal facilities installed in the oilpatch in Alberta. Typically the...
