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Pipework sizing questions
FIFE college
7
Chemical Engineering
Professional
01/14/2016

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Cards

Term
When it comes to the gas combustion requirements of a domestic natural gas appliance we are
wanting to establish 2 things. They Are
Definition
Correct amount of gas, at the correct pressure
Term
How do we determine the resistance of the pipe work and any tees or bends relative to pipe work
sizing
Definition
calculating its Equivalent Length
Term
If we carried out a Gas Inlet G20 Operating Pressure test at a new gas appliance just installed as part
of the commission with a result of 19mb, what is the maximum Operating Pressure (Working Pressure)
we should expect to find at the meter ?
Definition
20mb
Term
What is the maximum pressure loss permitted between the gas meter and any/all gas appliances that
has to be incorporated into your pipe sizing design
Definition
1mb
Term
On a pipe run of actual length 6 metres, you note 3 soldered elbows, 1 compression tee, and 1 formed
bend leading to the appliance. What would the 'Effective' Length of this run be assuming only 1
appliance is connected to the supply ?
Definition
8.3
Term
There are 2 key reasons that could prevent a new gas appliance from getting the correct amount of
gas at the correct pressure and these are
Definition
Inadequately sized gas Supply, or Meter Regulator Requiring Attention
Term
Heat Input (Gross) Equals
Definition
Gas Rate x C.V
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