Pipe diamter transitions
Pipe diamter transitions
(OP)
I current have a 1/2" diamter stainless steel pipe that transitions to a 1/4" diameter steel pipe via a compression fitting. When flowing at steady state the connection emits a low frequecy hum and causes gases to come out of solution. the operating pressure is approximately 20 psi. I have not been able to find a reference that specifies the length of the taper required to minimize the effect of the diameter change, any help would be greatly appreciated.





RE: Pipe diamter transitions
Was it de-burred afterwards?
What is the fluid?
What is the velocity?
RE: Pipe diamter transitions
Was it de-burred afterwards? I believe it to have been deburred afterwards.
What is the fluid? Water
What is the velocity? 1/4" pipe velocity is approx 392 ft/min.
The fluid is also being cooled from ambient room temperature to 32 degrees. The connection is sumberged in a freswater ice bath.
RE: Pipe diamter transitions
Is the pipe supported where a small flow induced vibration is exciting the pipe or one of its supports at its natural frequency?
RE: Pipe diamter transitions
I am no expert on this however I was just thinking wether
or not you could do a Bernoulli calculation on this and find out the pressure drop between the small and large diameter ie 1/2" to 1/4", I wondered if you have a slight
cavitation problem particularly as you are cooling the fluid
below ambient.
regards desertfox
RE: Pipe diamter transitions