Sizing the vents off the pressure regulator
Sizing the vents off the pressure regulator
(OP)
I am trying to size the vent off of a pressure regulator from a medical oxygen manifold. Pressure is ~350 psig. The vent is about 150 feet in length to get to the exterior of the building.
The manifold manufacturer recommends 1/2" pipe for the first 50 feet and 3/4" for the remaining. That just seems too small.
I have also seen a rule of thumb that say you increase your pipe one size for every twenty feet. That would put me at 2.5" by the time I get outside. That seems excessive, but I do not have any justification against it.
If anybody has any suggestions, I would appreciate it.
Thanks
The manifold manufacturer recommends 1/2" pipe for the first 50 feet and 3/4" for the remaining. That just seems too small.
I have also seen a rule of thumb that say you increase your pipe one size for every twenty feet. That would put me at 2.5" by the time I get outside. That seems excessive, but I do not have any justification against it.
If anybody has any suggestions, I would appreciate it.
Thanks





RE: Sizing the vents off the pressure regulator
Are you piping the vent connection outside in the event of diaphragm failure?
Good luck,
Latexman
RE: Sizing the vents off the pressure regulator
Typically the rooms with the manifolds are very close to an outside wall or to the roof.
This project is a remodel and the room is in the basement. The only route to the outside is in a storage room and through three floors to the roof.
RE: Sizing the vents off the pressure regulator
350 psig ---> regulator orifice ---> equalizer tube ---> vent connection ---> vent piping ---> 0 psig
Now you just need the details from the regulator and a good compressible flow reference, or textbook, and work it out. By hand, it's a two martini problem, but with the right software, it's a 5 minute job.
Good luck,
Latexman