What size gas pipe?

[bob26]

I am installing a two-burner and grill hob which is said to generate 3.9kw full blast.

The Calor site suggests a quarter inch od pipe should be adequate to supply 5.16 kw/h in Butane up to ten feet - and my gas bottle is only about 6 feet away from the burners.

But this seems a tiny pipe to feed three burners - and much smaller than the original installation which I am replacing. I think that one must be five sixteenths.

The inlet spigot on the cooker is 5/16" od. And the Calor site also helpfully warns:

"Undersized or flatten pipes are the biggest cause of poor performance of appliances. "


Whats size of pipe is usual for a standard three burner hob next to the companionway with the gas locker installed in the cockpit?

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[stamfordian]

although it does seem tiny ,it,s about right,think of it this way your cooker in the house has 4burners,large grill ,large oven ,sometimes two oven,s ,all are run on a half inch/12.5mm gas pipe,which is over sized for many domestic appliances.
The other consideration is preassure but normaly on a small cooker like yours it is set to run on the standard pressure for most lpg installations (i,ve forgotton what it is at present).you could put the larger pipe in without detrement to the system,if you can get it do so but make sure you can get fittings for it,i recently had to go to a hydralic specialist to get conversion fittings...a nightmare .
hope this helps tb sorry THAT,S 15MM NOT 12.5...DOH

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<P ID="edit"><FONT SIZE=-1>Edited by stamfordian on 15/03/2004 21:02 (server time).</FONT></P>

 

[sailorman]

6m/m woukd be ok but as the spigot is 8m/m u may as well keep to this size through-out

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[bob26]

Yes but the bore of a 15mm pipe is 6.25 times that of a 6mm one.

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[Jools_of_Top_Cat]

The pipe into the back of my oven was 8mm, so I used 8mm. That is for an oven, grill and two burners. Much easier to get fittings too, compression joints from plumbers, pipe from B&Q (cheapest for pipe) and taps and rubber hose fitting from camping shop. I also bought my armoured hose and std rubber hose from the caravan shop too.

<hr width=100% size=1>Julian

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[MIKE_MCKIE]

Must say I agree with Jules. I recently replaced my old oven, grill & 2 burner with a new grill & 2 burner. The original pipe was armored flexible rubber hose about 3 metres long, which gave everyone nightmares. I replaced the lot in 8mm copper, with the pipe & most of the fittings from B&Q. It was easy to work with, relatively cheap, & having a slightly oversized pipe gives me scope should I ever wish to install a heater or bigger cooker. Whole job took about 4 hours, including removing the old stuff and several tea breaks (from a thermos flask I hasten to add!).
Best of luck.
Mike

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[Bejasus]

I recently replaced mine up to BSS standard. Was previously 1/4 in. but when we checked the cooker rating(2 burner, grill & oven) the book said we should be using 3/8 or 8mm., so we changed it all to 8mm. I can't rmrmber the formula offhand but perhaps your engineer has the figures. Any Corgi registered plumber will be able to tell you.
TIP: If your flames are burning any yellow with everything turned on, then your supply is too small.

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[Fin]

It might be worth using 8mm pipe, we have 6mm pipe on ours and have found getting bits difficult. Calor gas place in southampton do 8mm fittings and not 6mm.

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