Air meter leakage
Air meter leakage
(OP)
For Type B Air Meter, how much leakage is acceptable?
I know that as the cir cools, it will lose a little pressure, but after allowing some time for the air to cool, how much leakage is acceptable? If the gauge needle drop 0.1 % in a say 30 seconds, is that OK? Most air meters I see have a little leakage, but 20-30 seconds seems like a reasonable time to run the test.Did i miss something in the Standard?
I know that as the cir cools, it will lose a little pressure, but after allowing some time for the air to cool, how much leakage is acceptable? If the gauge needle drop 0.1 % in a say 30 seconds, is that OK? Most air meters I see have a little leakage, but 20-30 seconds seems like a reasonable time to run the test.Did i miss something in the Standard?





RE: Air meter leakage
RE: Air meter leakage
That makes sense. The big leaks are easy; its the very minor ones that are difficult. I have 3 that don't have any leakage, and one that just has that very slow leak.
RE: Air meter leakage
RE: Air meter leakage
RE: Air meter leakage
RE: Air meter leakage
Always good advice.
Its amazing how easy it is to get lazy. I constantly remind technicians to "check the Standards". Everyone, it seems wants to have their own method of doing something. They complain that "your" method takes too long/ is too hard/etc. I remind them, it is not "your" method, or "my" method--there is only the method described by ASTM or AASHTO or whatever other agency.
Thanks for the reminder.
RE: Air meter leakage
As Ron said. There is no allowance for leakage. I have even had some CCRL inspectors pump up to initial pressure, leave meter on the bench overnight and check the next day. If you are having trouble finding the leak, i have found that if you pump it up, then submerge in water ( say a curing tank or other water bath) you can usually find the leak pretty quickly. Good luck.