Pressure Testing Equipment Flashcards
Analog gauges should have a full-scale range not more than _________ the nominal test pressure.
2x
Test pressures should read in the ________ of the test equipment gauge.
Center half 1/2
A pressure recording chart is used under what circumstances?
- Length of pipe is greater than 1000 ‘
- Test duration is 8 hrs
- Test pressure is equal to or greater than 150 PSI
All chart recorder reading must be verified with a ______
Pressure gauge
Air compressors can generate __________ which may be detrimental to plastic pipe.
High temperature
When the hot air from the compressor cools it may cause a decrease in pressure, as long as the pressure remains constant and above the minimum for the minimum test time, this test can be used to validate MAOP and produce a successful test, TRUE or False?
TRUE
During a pressure test, the temperature of a plastic pipe from not exceed _______ degrees.
100
What are two conditions that can lead to higher temperatures in plastic pipe?
- A pressure test of more than 2500’ of pipe
- Continuous compressor use lasting more than 60 minutes
What are some way to mitigate high temperatures?
- Use aftercoolers
- Take pauses while using the compressor
Steel pipe requires a hoop stress of _____ or more of the specified minimum yield strength (SMYS)
20%
What end caps are used for test pressures exceeding 100 PSI?
Welded or Butt-fused End Caps
On 2” IPS pipe, when pressure is 150 PSI or less what end caps are used?
Non-bolted, Positive-Restraint Mechanical End Caps
When using only pressure gauges for a pressure test, you need to record at least _____ pressure/time readings, one at the start and one at the end of the test period.
Two
If a main is not placed in service the next day following a pressure test, how much pressure should be left inside the pipe segment?
30 PSI + / - 3 PSI
