Hi
We are in the middle of an extensive kitchen refurbishment which included replacing an old boiler with a new Vaillant eco-tec 831 boiler in a new location. As this involved replacing most of the existing gas pipe we decided replace and hide the gas pipe in the hall way as well because it was fitted around the ceiling and was clearly visible. We also installed a new dual fuel range connected to a spur of the main gas pipe.
This work was done by a registered Gas Safe engineer and after completion I put down a new solid wood floor which has been sanded and varnished. The range cooker was bought second hand and needed to have the jets changed from LPG to Natural Gas so I thought it would be a good idea to have a qualified person do the work and check the cooker over as well so we knew it was safe.
The chap who installed the boiler and new gas main said he didn’t do cookers so I contacted a second Gas Safe engineer who after completing the work he said he couldn’t sign the cooker off because the main gas pipe was 22mm instead of 28mm and if the cooker was used the gas pressure would be too low for the boiler to operate properly which would make it dangerous.
The boiler is 31kW and the range has 5 gas burners totalling 5kW. The total distance from the meter to the boiler is 22.55m with a total of 21 elbow bends. The ‘T’ to the cooker is at 16.4m and has 2 elbows. At 1.3m before the boiler the pipe reduces to 15mm and has 3 of the 21 elbows.
I have attempted to do some calculations myself but as I’m a total amateur I don’t believe my results as they appear to be so far out and I can’t believe a Gas Safe engineer would say a 22mm gas pipe is OK.
According to my calculations even if you connected the boiler directly to the meter without the cooker or any elbow bends then 22.55m of 22mm gas pipe can supply 2.7 m³/hour and a 31kW boiler requires 2.9m³/hour!! I must be doing something wrong.
I have a diagram of the gas system which I will attempt to attach to this post together with my calculations.
View media item 48370
Please can someone double check my sums.
Many Thanks.
10Pints
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We are in the middle of an extensive kitchen refurbishment which included replacing an old boiler with a new Vaillant eco-tec 831 boiler in a new location. As this involved replacing most of the existing gas pipe we decided replace and hide the gas pipe in the hall way as well because it was fitted around the ceiling and was clearly visible. We also installed a new dual fuel range connected to a spur of the main gas pipe.
This work was done by a registered Gas Safe engineer and after completion I put down a new solid wood floor which has been sanded and varnished. The range cooker was bought second hand and needed to have the jets changed from LPG to Natural Gas so I thought it would be a good idea to have a qualified person do the work and check the cooker over as well so we knew it was safe.
The chap who installed the boiler and new gas main said he didn’t do cookers so I contacted a second Gas Safe engineer who after completing the work he said he couldn’t sign the cooker off because the main gas pipe was 22mm instead of 28mm and if the cooker was used the gas pressure would be too low for the boiler to operate properly which would make it dangerous.
The boiler is 31kW and the range has 5 gas burners totalling 5kW. The total distance from the meter to the boiler is 22.55m with a total of 21 elbow bends. The ‘T’ to the cooker is at 16.4m and has 2 elbows. At 1.3m before the boiler the pipe reduces to 15mm and has 3 of the 21 elbows.
I have attempted to do some calculations myself but as I’m a total amateur I don’t believe my results as they appear to be so far out and I can’t believe a Gas Safe engineer would say a 22mm gas pipe is OK.
According to my calculations even if you connected the boiler directly to the meter without the cooker or any elbow bends then 22.55m of 22mm gas pipe can supply 2.7 m³/hour and a 31kW boiler requires 2.9m³/hour!! I must be doing something wrong.
I have a diagram of the gas system which I will attempt to attach to this post together with my calculations.
View media item 48370
Please can someone double check my sums.
Many Thanks.
10Pints
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