Pipe Sizing

Question 1

The 2-psi system is usually considered for economic and gas volumes
True or false

Answer 1

True

Question 2

If you feel the installation will require more then a reasonable amount of fitting you would check what to know what to do

Answer 2

Table A.16 of the can/csa b149.1

Question 3

When sizing high pressure gas line sizing (pressures above 2 psi you use table A.16 what do you add to the longest run

Answer 3

Add the fittings equivalent length to the longest run

Question 4

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

Answer 4

Increase one pipe size for every 50ft

Question 5

Vent termination must be how far from moisture exhaust duct or combustion air inlet

Answer 5

3ft

Question 6

Vent terminations must be how far from a mechanical inlet

Answer 6

10ft

Question 7

You must obtain what before any gas work installation work

Answer 7

A permit to do it

Question 8

Showing no drop in pressure is a

Answer 8

Pressure test requirement

Question 9

Approved gas leak detection equipment can also be used on what after rough in

Answer 9

Can also be used to test finish piping

Question 10

Minimum test pressure for rough in piping is

Answer 10

15-psi for 15 minutes

Question 11

The minimum size of face on a test gauge is

Answer 11

3 inches in diameter

Question 12

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

Answer 12

100 psig and on table 6,3 of the code book

Question 13

The maximum range of the gauge shall exceed the test pressure by atleast what but not more than what

Answer 13

15% to 300%

Question 14

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

Answer 14

0-18 pounds / 0-60 pounds

Question 15

After the pressure test on the finished piping is completed what needs to happen

Answer 15

The system with need the air purged out of the gas line to allow the appliances to be lit

Question 16

The purge should be vented to what

Answer 16

To a safe location or to an approved purge burner

Question 17

The purge point shall not be any closer then

Answer 17

10 ft to a building or air intake

Question 18

A valve with an attached handle is required to be installed in the purge piping where

Answer 18

No more then 5 feet from the purge point

Question 19

When purging a gas line 4 inches or bigger, any air used in the test must be purged with

Answer 19

Inert gas (usually carbon dioxide or nitrogen)

Question 20

You can choose the inert gas initially for what reason

Answer 20

So the there is no need to purge air out of the system

Question 21

An appliance under 400mbh may have the gas line purged to an appliance burner but what can the burner not be in

Answer 21

A combustion chamber

Question 22

Two types of pressure tests

Answer 22

Standing pressure test or operating pressure test

Question 23

Low pressure residential systems are what W.C

Answer 23

7-14 inches W.C

Question 24

Natural gas utility company’s will deliver gas into residential home at what

Answer 24

They will set your meter for 7inches W.C

Question 25

Propane low- pressure delivery is what

Answer 25

11inches W.C