Length of gas pipe from meter to boiler

[ShaunCorbs]

You sure Timmy quick *** packet gives me a drop of 0.8 on 35mm with 14 high bends

 

[Timmy D]

You sure Timmy quick *** packet gives me a drop of 0.8 on 35mm with 14 high bends

Ooooo gonna check again.....

Good catch Shaun, I had the app set on feet.....not meters.

Just got the same outcome as you.

That changes things....

 

[oz-plumber]

You can’t have more than 1mb drop from meter to appliance.
to 20k
You have to run the appliance at max, you can’t down rate it.

So I don’t understand what this “loop hole” is?

Loop Hole is, that if you can prove the appliance is working correctly with the correct gas pressures , you may get away with a slightly undersized gas service line.

As stated previously, if you by a 24kW boiler and only require 20kW, commission the appliance to 20 kW and see what your pressure drop is at the appliance.

Is a Gas Inspector going to re calibrate the appliance to maximum and then test the gas line for correct pressures?

 

[Deleted member 120897]

Loop Hole is, that if you can prove the appliance is working correctly with the correct gas pressures , you may get away with a slightly undersized gas service line.

As stated previously, if you by a 24kW boiler and only require 20kW, commission the appliance to 20 kW and see what your pressure drop is at the appliance.

Is a Gas Inspector going to re calibrate the appliance to maximum and then test the gas line for correct pressures?

This won’t work with a Combi boiler, as you can range rate the heating but the hot water will be the higher output.

 

[oz-plumber]

This won’t work with a Combi boiler, as you can range rate the heating but the hot water will be the higher output.

OP doesn't mention a combi.

If he had mentioned a combi, I wouldn't have made the suggestion.

 

[Timmy D]

Loop Hole is, that if you can prove the appliance is working correctly with the correct gas pressures , you may get away with a slightly undersized gas service line.

As stated previously, if you by a 24kW boiler and only require 20kW, commission the appliance to 20 kW and see what your pressure drop is at the appliance.

Is a Gas Inspector going to re calibrate the appliance to maximum and then test the gas line for correct pressures?

I understand that people regularly let a slightly undersized gas pipe pass.

However, to complete commissioning, you need to test the gas pressure on max load, not partial. On a new install I’m installing a test point under the boiler and running other appliances. I’m not letting an undersized gas pipe slide.

However, I’d size the pipe and new boiler demand and know if it needs an upgrade when quoting work (and include the gas upgrade).

Loop Hole is, that if you can prove the appliance is working correctly with the correct gas pressures , you may get away with a slightly undersized gas service line.

Got a source?

 

[oz-plumber]

I understand that people regularly let a slightly undersized gas pipe pass.

However, to complete commissioning, you need to test the gas pressure on max load, not partial. On a new install I’m installing a test point under the boiler and running other appliances. I’m not letting an undersized gas pipe slide.

However, I’d size the pipe and new boiler demand and know if it needs an upgrade when quoting work (and include the gas upgrade).


Got a source?

In new installs, I generally oversize the gas supply pipe.

In existing houses or premises, where the gas supply pipe is borderline to the requirements, things can be done to alleviate the installation of a new gas line.

If the appliance works correctly with a slightly undersized gas supply and you can prove the appliance is working correctly, then there isn't an issue or a necessity to replace the gas line.
We have inspections from auditors on some jobs. At times they will question whether or not the gas supply pipe is the required size.
Operate the appliances and test the inlet gas pressures and if they prove to be adequate - end of story.

I have at times reduced the output of heating only boilers to get the gas supply over the line.
Unless the customer is going to add extra panels or add other gas appliances, then the existing gas supply is adequate.

But that will be up to the person doing the works, whether it me me or someone else

 

[Jerry]

You can’t have more than 1mb drop from meter to appliance.

You have to run the appliance at max, you can’t down rate it.

So I don’t understand what this “loop hole” is?

Isn't it the legendary MI's?

 

[Sparkgap]

I get 1.65mB drop plus fittings for 30m in 28mm! Certainly suggest 35mm pipe or larger.