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Gas Works

What's max distance for routing gas mains to boiler?

Anonymous user 28/02/2024 - 3.22 PM

My current gas mains supply comes in to my garage, where, it is connected to the wall mounted meter. The garage is to be demolished and rebuilt to support a 2nd elevation extension. Therefore I need NG to re-route the mains supply to an external meter box. Catch 22, NG can't re-route to the new location until the rebuilt wall is in place but I can't demolish and re-build until the gas mains ahs been re-routed. As I see it I have 2 options: 1. Pay twice for NG to undertake 2 re-routes (1 x interim capped and 2nd final location) 2. Install in to a semi concealed ground box round the front of the house. If I go for option 2 it means that the meter will be 7-8 meters from the boiler. Is this a problem? Also, what routing are we permitted to run to the boiler? To run the connection internally would be a nightmare as it's a solid property (no partition wall in this place). Can we bury the pipe in to the ground from meter round in to the re-built garage, whereby we could continue the run along the wall and through in to the kitchen? Help and advice would be very welcome.

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2 Answers

London Efficiency Ltd

Rating: 5 out of 5

Fulham, South London, London

Good evening, The new gas supply will need to be suitably sized according to the boilers KW output to ensure the appliance is not under gased, this means that the longer the gas pipe run and bends the greater diameter pipework will be required to ensure the appliance burns correctly and maintains a correct gas working pressure. Depths and pipework protection will need to be considered when running the pipework such as sleeving etc.... I hope this has been of some help to you.... Kind regards, Kenny Dezitter Technical Manager @London Efficiency Ltd

Answered20 August 2016

Anonymous user

According to the BS 6891 (gas pipework within domestic dwellings) the gas pipe system must be designed so that can supply ALL the appliances simultaneously with a maximum pressure loss 1 mbar from the gas meter outlet to all appliance inlet connections. We must to calculate the actual length of pipe plus fittings or bends, to convert appliance heat input into a gas rate etc. Typical for maximum length (about 30 m ) we increase the pipe diameter up to 35 mm copper. Buried pipes shall be sleeved,there must be at least 25mm of screed cover above the pipe,NO compression joints or unions may be buried, Copper,corrugated stainless trac pipe may be buried. Kind Regards Panos

Answered8 May 2017