GAS REFERENCE PACKAGE

1 GAS REFERENCE PACKAGE 2010v2 Aim To Pass With Gb-Gas 1 GAS REFERENCE PACKAGE This document is free to download and copy from GAS REFERENCE PACKAGE 2010v2 Aim To Pass With Gb-Gas 2 Combustion See for more details. Visual inspection The main reasons for incomplete combustion 1. Lack of oxygen (soft yellow flames) 2. Incorrect burner pressure (over gassed / under gassed) 3. Flame impingement (flame chilling) A good pre-aerated flame should be bright blue with a strong inner and outer cone, and above all will have a roar. If there is any yellow in the flame then it is incorrect. (Do not mistake yellow for orange, as orange flames are usually dust being burnt.) Procedure for carrying out a service with the aid of a Combustion Analyser.

2 1. Carry out the service as per manufacturer s instructions Tightness test, clean and inspect. 2. If the appliance is range rated turn to maximum setting Traditional boilers adjust to max burner pressure. Combination boiler on hot water mode or chimney sweep mode. Condensing boilers check manufacturer s instructions. All other appliances burner(s) on full.** **Be aware that checking a eye level grill when the hob burners are on will cause incomplete combustion on the grill. 3. Take flue gas analysis If acceptable: Reset to original burner pressure / gas rate and retest if ok Then conduct: Flue and spillage test Check safety controls. Ventilation. Confirm safe operation If unacceptable: If possible rectify fault(s) then re test If not possible follow the unsafe situations guidelines.

3 At Risk for flued appliances Immediately Dangerous for Flueless appliances. 4. Complete job documentation If using a flue gas analyser acceptable readings vary depending on the appliance type. Consult manufacturers instructions. If the manufacturer supplies a Co2 reading only then make sure you are very close to that reading. GAS REFERENCE PACKAGE 2010v2 Aim To Pass With Gb-Gas 3 BS 7967-3 APPLIANCE TYPE CO/CO2 RATIO Back boiler unit Boiler In combination with fire Central heating boiler Hot water circulator Flued space heater (check man instructions) Flueless space heater Water heater flued and Flueless Warm air heater Flueless cooker Oven Hob Visual inspection of flames Grill (CE marked) Grill (No CE mark) Range oven flued Refrigerator (LPG) Tumble drier Flued flueless Gas lights (LPG) Any ratios above these readings maybe through, misuse, lack of maintenance, damage or aging.

4 Make sure the probe is placed correctly: Open flued: centre of the flue, or 200mm inside the draught diverter. Room sealed: From the manufacturers test point or 200mm inside the flue duct from outside Flueless appliances: On the flue outlet using the spreader bar tester. The appliance has run for 5 mins. Monitor the Co reading carefully if this starts rising quickly then remove the tester as you may damage the equipment. If you don t get the reading you are looking for let it run for a further 10 mins and retest. A full clean and check or repair of the appliance is essential and then re-tested. If it is not possible to achieve these levels then the appliance should be regarded as at risk for flued appliances and immediately dangerous for Flueless appliances. COMBUSTION ANALYSER Natural gas 21 COMBUSTION ANALYSIS GAS REFERENCE PACKAGE 2010v2 Aim To Pass With Gb-Gas 4 Carrying out a room test for carbon monoxide with a Combustion Analyser.

5 General 1. Position an open ended sampling probe approximately 2 m above floor level in the centre of the room and at least 1 m away from any suspect appliance installation . 2. Close all external doors, windows and customer adjustable ventilation. 3. Record the level of CO over a 15 min period. If the indoor level of CO starts to rise during this period, check for CO migration from other sources. 4. If there is no rise then proceed to test the appliance. Room sealed and open flued appliances Operate the appliance at full rate until the CO reading stabilizes or begins to fall, whichever occurs first. Cookers Ensure that all permanent ventilation to the space in which the appliance is situated is unobstructed. Place a saucepan on each of the pan-supports above the two largest hotplate burners and put approximately a litre of water in each and cover with a lid.

6 Use a saucepan with a flat base and a base diameter of between 160 mm and 220 mm. Place the grill pan in its highest position under the grill. Open/operate the customer adjustable ventilation in accordance with the cooker manufacturer s instructions, window or extractor fan. Light the grill, oven and the two hotplate burners at their maximum setting. Turn the oven down to gas mark 5 (or mid-range if not calibrated in gas mark numbers). Record the CO levels at 1 min intervals. Turn the hotplate burners down to simmer when the water boils. Turn the grill off after 30 min. If during the test the CO reading: begins to fall without exceeding 30 ppm, stop the test; the installation and cooker are satisfactory; does not exceed 30 ppm for longer than 20 min and begins to fall and does not exceed 90 ppm at any time, stop the test; the installation and cooker are satisfactory; Exceeds 90 ppm at any time, stop the test, ventilate the room, identify the cause, rectify and repeat the test.

7 Flueless water heaters Ensure that all permanent ventilation to the space in which the appliance is situated is unobstructed. Close all customer adjustable ventilation to the space in which the appliance is situated. Light the appliance and operate it at maximum gas rate for 5 min recording the CO levels at 1 min intervals. Flueless space heaters Ensure that all permanent ventilation to the space in which the appliance is situated is unobstructed. Close all customer adjustable ventilation to the space in which the appliance is situated. Light the appliance and operate it at maximum gas rate for 30 min recording the CO levels at 1 min intervals. GAS REFERENCE PACKAGE 2010v2 Aim To Pass With Gb-Gas 5 pipe work inspection See for more details. Common faults found on the meter installation : Valve handle missing Valve handle drops to on position On / off label missing Incorrect materials at meter Incorrect or no telephone number No emergency procedures label No governor on primary meter Governor not sealed Common faults found on pipework installation : No 10mm bonding within 600mm of the meter To close to electric meters or outlets (150mm) To close to electric cables or conduits (25mm) Pipework inappropriately supported Incorrect sleaving methods Incorrect materials used in pipework Incorrect fittings used in pipework Unsatisfactory workmanship Re-establishing gas supplies This checklist should be conducted every time the gas has been turned off.

8 Even if only conducting a tightness test. A visual check on the pipework installation A visual check of the appliances should be made Calculate the ventilation requirements for the installation Test for soundness Purge the meter from the furthest practical point Purge volume = 5x the meter badge capacity for installations with pipe up to 28mm ( imperial meter(ft ) = 5x = ) (metric meter(M ) = 5x = ) If there is pipework greater than 28mm or a meter bigger than a 6m capacity a calculation must be used U16 meter 5 x 0. 006m = Purge volume = pipework length x volume of 1m length x (for fittings) x plus meter purge volume. Eg 3 m of 35mm pipe plus a U16 3 x x = m + m = m . See page 26 or IGEUP1B FOR MORE DETAIL or visit MMaatteerriiaall aanndd nnoommiinnaall ssiizzee ooff ppiippee VVoolluummee ooff 11mm lleennggtthh ooff ppiippee SStteeeell // ssttaaiinnlleessss sstteeeell CCooppppeerr 1155mmmm ((mm )) 1155mmmm ((mm )) 2200mmmm ((mm )) 2222mmmm ((mm )) 2255mmmm 11 ((mm )) 2288mmmm ((mm )) 3322mmmm 11 ((mm )) 3355mmmm ((mm )) Purge the remaining sections of the installation (light and detect method)

9 Re-light each appliance in turn checking that all user controls are working satisfactorily Check all open flued appliances for spillage Inform customer on appliance use and gas safety GAS REFERENCE PACKAGE 2010v2 Aim To Pass With Gb-Gas 6 Testing for tightness (Using Gas) NEW SYSTEMS See for more details. After visually inspecting the installation 1. Turn the gas off 2. Make sure all appliances are disconnected 3. Turn all valves on pipework on. Connect a zeroed manometer to the meter test point and start the test procedure Test name Reason Test pressure Test time Let-by test To check if MCV is passing, if greater than (max or with a digital) report to supplier. To confirm let-by spray LDF in valve 10mb 1 min Stabilisation to allow for temp. differences 20mb 1 min Soundness test (No pressure drop or smell allowed) 20mb 2 min 4.

10 Make sure all appliances are re-connected 5. Turn all valves on including lifting the cooker lid. Connect a zeroed manometer to the meter test point and start the test procedure Test name Reason Test pressure Test time Stabilisation To allow for temp. differences 20mb 1 min Soundness test (record any drops here) 20mb 2 min Gas test for pipework and appliances in new installations NO DISCERNABLE DROP ALLOWED (max or with a digital) The test pressure must never be greater than 23mb as the governor may lock up, if so you will have to spray all the inlet pipework to check for leaks. Air testing Connect a zeroed manometer to the TEST TEE and start the test procedure. Test name Reason Test pressure Test time Stabilisation to allow for temp. differences 20mb 1 min Soundness test (record any drops here) 20mb 2 min Air test would be used for pipework in new installations NO DISCERNABLE DROP ALLOWED -(max or with a digital) ** Test all testpoints with leak detector fluid** GAS REFERENCE PACKAGE 2010v2 Aim To Pass With Gb-Gas 7 Testing for tightness (Using Gas) Existing Systems After visually inspecting the installation 1.