Term
|
Definition
| A purpose designed enclosure to contain gas pipes |
|
|
Term
|
Definition
| An enclosed space through which an installation pipe may be run. |
|
|
Term
|
Definition
| A tubular case inserted in a prepared hole in a structure for reception of an installation pipe |
|
|
Term
| Separation and Equipotential Bonding |
|
Definition
Gas pipework shall be at least..
25mm from any electrical cables and/or fittings
And at least 150mm from electrical meters,switches etc |
|
|
Term
Main Equipotential Bond
Cross Sectional Area size? |
|
Definition
|
|
Term
| Maximum Distance for main equipotential bonding at meter outlets |
|
Definition
Internal Meters 600mm
External Meters:Connection should be internal and as near to point of entry |
|
|
Term
| Pipes buried in Concrete Floors |
|
Definition
Shall be sleeved
Not buried in concrete slabs only in screed
Must be at least 25mm screed cover above the pipe |
|
|
Term
|
Definition
Shall be sleeved
Shall not run within cavities of walls and shall pass through by shortest route |
|
|
Term
External Pipe (Buried)
With only pedestrian traffic |
|
Definition
|
|
Term
External Pipe (Buried)
Buried in soil
Below vehicular traffic areas |
|
Definition
|
|
Term
|
Definition
Must be installed as near as practicable to point of entry to a building.
And must FALL TO OFF POSITION |
|
|
Term
|
Definition
| Only to be used when supplying gas to domestic flued appliance |
|
|
Term
|
Definition
| Under sizing can impair performance of appliance,or even incomplete combustion. |
|
|
Term
BS6891
Mains Gas Piping Installations |
|
Definition
| Pressure drop along pipeline at maximum demand should be NO MORE than 1mb |
|
|
Term
| If undersized pipes are installed?? |
|
Definition
| The pressure at the burner could become so low that incomplete combustion occurs. |
|
|
Term
| Equation for Gas Flow rate |
|
Definition
Appliance Heat Input(kW)
-------------------
c.v (nat gas 38.6)
then x by 3.6 to convert flow rate to m3/hr |
|
|
