Guild of Gas Fitters Operatives 2
“Working Safely with Gas”
History of Gas, Families 1,2,3.
1 Manufactured, Whale Oil/Coal town poisons/CO 1829/30. 2 Hydrocarbons NG 1960, 3 LPG.
Platforms, 200,000Mls pipe, 85B, 25mph, 1970’s NG, Pipe Sizes down to 10mm.
Emergency Control Valve, ECV.
Accessible, fall to off, direction tape, secure handle, split pin, second EVC in flat, Let By testing, LDF inside ball. Labelling, details. Located close to entry gas supply, in meter box breaking standards.
Anaconda, contour, connection, Regulator.
Single side only, Stressing cracks, thread seal. Sealed, lockup, 75/21mb, system pressures SP, WP, Tightness. MOP two meters from any opening.
Meter Box, Bracket, Fixings, fittings and clearances
Box range for environment, secured all round, positioning.
Meter condition, damaged, supplier’s information.
Tamper supplier reset, physical damage, Contact.
Old and New styles, Billing info, x3 over paying.
Meter terminology, Utility, General, Electronic.
Electronic ultrasonic, low battery free gas. Sensor smart meter.
Meter Sizes, U6/G4, E6, U10, U16, [U160].
Small Domestic to Large domestic range, safest meter E6 low volume. Pressure drop, U16 1mb, U6/G4 4mb, E6 8mb.
Badge Capacity, U6-0.071ft3, G4-0.002m3/2dm3
Normal purge 0.010m3, Flame off IV > 0.02m3.
Primary Regulator controls installation demand. WP,
U6- 212 ft3 /h x 1040/3412 = 64kW, U16- 565 ft3 /h x 0.305 = 170kW. U160 5650 ft3 /h x 0.305 = 1722kW.
Meter Purge, U6-0.071ft3 /Red Dial 3.5 Divisions.
Five chambers, 5 x 0.071 ft3 = 0.355ft3
Meter Purge, G4-0.010m3 /Red Numbers 0.010.
Five chambers, 5 x 0.002m3 = 0.010m3
Appliance Gas rating complete combustion.
Over rating to MI can indicate hidden leak. Cooker 3 Burners, one appliance,
G4, m3 in 2 min = 30 x 35.35 x 1041 / 3412 = Gross kW.
U6, ft3 1 rev timed divided into 3600 x 1040/3142 = GkW.
G4 simple calculation, m3 x 323 = GkW..