Pressure Tap and sensor location for orifice plate
Pressure Tap and sensor location for orifice plate
(OP)
Does anybody know the correct spacing for pressure taps before and after an orifice plate. I read in a book that D and D/2, Flange, and corner taps were recommended. However, the same book also had a figure for the pressure tap locations at 2D and 2D.
Also, where is the best location to mount a temperature sensor relative to the orifice plate.
Also, where is the best location to mount a temperature sensor relative to the orifice plate.





RE: Pressure Tap and sensor location for orifice plate
You can use corner taps, flange taps (located 25.4mm up- and downstream) or D and D/2 taps. "D and D/2 taps" imply the upstream pressure sensor is D away, and downstream D/2. Any other spacing of taps is going to give you increased uncertainty relative to published data correlations. The above gives a correlation formula that depends on the tap location; I would bet that a published correlation in a book somewhere doesn't include those effects, since they are generally pretty small...but it's safest to use corner taps IMO.
From the above reference, the preferred method is a downstream tap. The temp sensor or densitometer well, of diameter < .03*D should be located at least 5D upstream, or at least 4D to 8D downstream depending on the diameter ratio d/D (β).
RE: Pressure Tap and sensor location for orifice plate
Pipe taps are no longer allowed.
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
The harder I work, the luckier I seem
RE: Pressure Tap and sensor location for orifice plate
Why are pipe taps no longer allowed?
RE: Pressure Tap and sensor location for orifice plate
RE: Pressure Tap and sensor location for orifice plate
"sending you a copy" is against the law.
The committee found that the quality control on field installed pipe taps was universally inconsistent and found that improper taps were creating excessive uncertainty. I just found that my copy of Part 2 is out of date by a few years so I just bought a new copy. I'll let you know if they've added them back in .
David
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
The harder I work, the luckier I seem
RE: Pressure Tap and sensor location for orifice plate
David