Gasline Sizing Flashcards
What’s the first thing to determine when running a gas line?
Type of fuel
All appliances must be certified for what
The type of fuel being used or it can’t be installed
Excessive amount of fittings and directions may cause what
Potential problems
What’s the outlet pressure of a gas metre for natural gas?
7” to 14” wc
When running off manifold with gas lines, what needs the safety factors to consider
Tagged
No longer then 50 ft
Where do you find inputs for the appliances?
Rating plate
If MBH value falls between the numbers, what must you do?
Go to the higher value
Before you run a gas line, what must be done
Pull a permit
What’s the minimum size face on a test dial gauge
3”
Up to 2 psig what is the pressure test requirements for 200 ft or less
15 psig for 15 min
For 2 psig gas line what is pressure test requirements for 200 feet or more?
15 psig for 60 min
All wrapped and factory coded piping and tubing. Have to be pressure tested to what
Min 100 psig
3 inch pressure gauge needs to calibrate in what increments
2 psig or 2 percent
Gauge should not exceed the test pressure by at least what
15 percent but no higher then 300 percent
When pressure test is complete what’s the next steps?
Purge line to outside no closer than 10 feet to building intake
How do you verify a gas line is properly sized
Standing pressure test
Operating pressure test
What’s the maximum allowable drop on gas?
1” wc
Where is standing pressure test taken from?
Downstream of service regulator
If pressure drops greater than a level limits, what’s the cause?
Gas lines too small
Every time you do a gas piping installation what must be done
Standing and operating pressure test
what’s the maximum length of corrugated metal connecter for suspended, appliance, or decorative appliance?
2ft
A commercial tubing system must be identified at what intervals
20 ft
Can swing joint be installed in a concealed location
No
Propane has a density of what
1.5
