Pipe Sizing Flashcards
The 2-psi system is usually considered for economic and gas volumes
True or false
True
If you feel the installation will require more then a reasonable amount of fitting you would check what to know what to do
Table A.16 of the can/csa b149.1
When sizing high pressure gas line sizing (pressures above 2 psi you use table A.16 what do you add to the longest run
Add the fittings equivalent length to the longest run
To overcome friction on a vent line the vent will have to be increased to manufacturers specifications if you don’t have instructions what do you do
Increase one pipe size for every 50ft
Vent termination must be how far from moisture exhaust duct or combustion air inlet
3ft
Vent terminations must be how far from a mechanical inlet
10ft
You must obtain what before any gas work installation work
A permit to do it
Showing no drop in pressure is a
Pressure test requirement
Approved gas leak detection equipment can also be used on what after rough in
Can also be used to test finish piping
Minimum test pressure for rough in piping is
15-psi for 15 minutes
The minimum size of face on a test gauge is
3 inches in diameter
All wrapped or factory-coated piping and tubing have to be pressure tested up to what unless otherwise approved and how is the time of test figured out
100 psig and on table 6,3 of the code book
The maximum range of the gauge shall exceed the test pressure by atleast what but not more than what
15% to 300%
To run a 15 pound pressure test on a gas line you would need a gauge that’s ranged atleast what but the cause also can’t exceed what
0-18 pounds / 0-60 pounds
After the pressure test on the finished piping is completed what needs to happen
The system with need the air purged out of the gas line to allow the appliances to be lit
The purge should be vented to what
To a safe location or to an approved purge burner
The purge point shall not be any closer then
10 ft to a building or air intake
A valve with an attached handle is required to be installed in the purge piping where
No more then 5 feet from the purge point
When purging a gas line 4 inches or bigger, any air used in the test must be purged with
Inert gas (usually carbon dioxide or nitrogen)
You can choose the inert gas initially for what reason
So the there is no need to purge air out of the system
An appliance under 400mbh may have the gas line purged to an appliance burner but what can the burner not be in
A combustion chamber
Two types of pressure tests
Standing pressure test or operating pressure test
Low pressure residential systems are what W.C
7-14 inches W.C
Natural gas utility company’s will deliver gas into residential home at what
They will set your meter for 7inches W.C
