InsightFuel performs CNG Station System Testing
When new assembly of gas piping and tubing is complete, a pressure test is required by any authority holding jurisdiction for inspecting a compressed natural gas fueling station.
Your Pressure Testing resource
We offer traditional pneumatic pressure testing using inert high pressure gas as well as hydrostatic testing, which is both faster and safer. We recommend hydrostatic testing especially on larger systems and ones which involve third party contractors.
There are three reasons for this recommendation.
1) safety – indisputably, hydrostatic testing at high pressures is safer than pneumatic testing at the same pressure.
2) convenience – it is often costly and difficult to procure sufficient volumes of high pressure gas cylinders in many markets
3) dryness – ironically, following the entire hydrostatic test process including purging & drying ensures a drier piping system than pneumatic testing!
“How can this be?” we are often asked.
Tubing manufacturers have no specific dryness requirement in the manufacturing specifications they follow (specifically ASTM A-269 and A-213).
Most perform hydrotests on their products for the reasons listed above. Most tubing manufacturers follow a drying process, but it’s a shop practice – not documented or necessarily effective.
There are no independent assurances of dryness in tubing.
Following hydrostatic testing, we purge and draw vacuum on the tubing. These treatments ensure the water we introduced – and possibly residual moisture from the mill – is removed before completing installation.
You can also view a copy of our Pressure Testing procedure.