Module 6.1 Knowledge Questions

Question 1

The let by test is carried out at a pressure of…

a) 10 inches water gauge
b) 10 bar
c) 10 pascals
d) 10 millibar

Answer 1

d) 10 millibar

Question 2

The gas/air mixture being purged from a domestic installation needs to be lit when the installation volume exceeds….

a) 0.01m³
b) 0.35m³
c) 0.071ft³
d) 0.02m³

Answer 2

d) 0.02m³

Question 3

The maximum permissible tightness test pressure loss for a U6 meter fitted to an existing installation with max 28mm pipework and appliances connected is….

a) 1 mbar
b) 2.5 mbar
c) 4 mbar
d) 8 mbar

Answer 3

c) 4 mbar

Question 4

After a successful let-by test the pressure should be slowly raised to….

a) 10 mbar
b) 20 mbar
c) 21 mbar
d) 23 mbar

Answer 4

b) 20 mbar

Question 5

When designing a gas installation the maximum allowable pressure drop between the meter and any appliance is…

a) 5 mbar
b) 2 mbar
c) 1 mbar
d) 1 bar

Answer 5

c) 1 mbar

Question 6

The IGE publication covering tightness testing of gas installations with pipework limited up to 35mm copper or DN32 steel; a volume not exceeding 0.035m3 and with a maximum rating of 16m3/hr is…

a) IGE/UP/7
b) IGE/UP/8
c) IGE/UP/1A
d) IGE/UP/1B

Answer 6

d) IGE/UP/1B

Question 7

The gas meter that has a badged capacity of 0.035 ft3 is…

a) E6
b) U6
c) U16
d) G10

Answer 7

b) U6

Question 8

The installation volume (IV) of a system fitted with a U6 gas meter, 10m of 35mm copper, 5m of 22mm copper pipework and a further 5m of 15mm copper would be…

a) 0.04997m³
b) 0.03252m³
c) 0.02684m³
d) 0.01977m³

Answer 8

d) 0.01977m³

Question 9

The Purge Volume of an installation fitted with a U6 gas meter, 10m of 35mm copper, 5m of 22mm copper and a further 5m of 15mm copper is….

a) 0.04987m³
b) 0.027655m³
c) 0.03684m³
d) 0.01477m³

Answer 9

b) 0.027655m³

Question 10

After a successful tightness test a smell of gas persists. The correct action would be…..

a) To repeat the tightness test over 5 minutes
b) To contact CORGI
c) To contact the ESP
d) To do nothing as the installation is OK

Answer 10

c) To contact the ESP

Question 11

What is the time period that must be allowed for a domestic tightness test?

a 1 minute.
b 2 minutes.
c 3 minutes.
d 4 minutes.

Answer 11

b 2 minutes.

Question 12

Prior to the domestic tightness test, 1 minute is allowed to check for the meter control passing gas. It this test was not carried out, the consequences could be:

a Gas may be escaping through the inlet supply.
b The gas pressure could rise within the meter.
c Gas that is escaping could be replaced from the supply.
d Gas escaping from the service would be recorded.

Answer 12

c Gas that is escaping could be replaced from the supply.

Question 13

What equipment must be used to pin point the source of a gas escape?

a A U tube manometer.
b An electronic gas detector.
c Diluted washing up liquid.
d Leak detector solution.

Answer 13

d Leak detector solution.

Question 14

When testing a new installation with air prior to the installation of a gas supply, it is not necessary to allow 1 minute for stabilization:

a. True.
b. False.

Answer 14

b. False.

Question 15

If, when carrying out a tightness test, the readings on each side of a U gauge are 16mbar and 20mbar, the pressure at which the test is being carried out is:

a 16mbar.
b 20mbar.
c 18mbar.
d 36mbar.

Answer 15

c 18mbar.

Question 16

The permissible leakage rate tor a new gas installation is:

a 0mbar.
b 1mbar.
c 2mbar.
d 4mbar.

Answer 16

a 0mbar.

Question 17

It during the initial stages of a tightness test the meter control should be found to be passing gas, what must the gas operative do?

Answer…….

Answer 17

Turn off the gas emergency/meter control and contact the gas supplier/transporter