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diesel_jim



Member Since: 13 Oct 2008
Location: hiding
Posts: 6092
United Kingdom 2006 Defender 110 Td5 SW Epsom Green
25 litre plastic drums.....
Does anyone happen to know how much internal (As in, air/fluid) pressure a normal 25 litre oil drum, plastic type with screw on cap, can handle before it goes pop?

I'm trying to use one to fill & pressurise my roof solar panel water heating system. Needs to go to 2bar, but (using my garage compressor to charge it), the drum expands quite a bit. and I don't fancy having glycol all over the attic and ceiling below.

Tried googling but just seem to end up with home brew 25 litre kegs.... but still no mention of the pressure limit.

Might have to try using a steel jerrycan instead.
Post #814105 7th Feb 2020 8:46pm
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MJN110



Member Since: 18 May 2015
Location: North Yorkshire
Posts: 380
United Kingdom 2016 Defender 90 Puma 2.2 Landmark LE Montalcino Red
It sounds highly risky to me especially in a loft space. 2016 Defender Landmark 90
2005 Defender CSW TD5 90XS
Post #814108 7th Feb 2020 9:53pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17386
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
The only way to find out is to hydraulic test one - fill it with water to the brim the pressurise it from your compressor until either you get to about 4 bar or it bursts. If it's ok at 4 bar you are *probably* ok at 2.

Filling it to the brim with water means it won't explode if it bursts since water is incompressible, this is the same way we hydraulic test loco boilers.
Post #814124 7th Feb 2020 11:32pm
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SteveRat



Member Since: 01 Aug 2012
Location: Chester
Posts: 7
United Kingdom 1995 Defender 90 300 Tdi CSW Arles Blue
When I did mine I used a plastic spray container (used for weedkiller etc) from B&Q I think. They are designed to be pressurised in order to vaporise the spray. Not sure what it held but it stood about 18" high perhaps 8"-10" diameter.
Post #814127 8th Feb 2020 12:59am
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HK07



Member Since: 15 Dec 2016
Location: Hampshire
Posts: 746
England 2007 Defender 90 Puma 2.4 HT Cairns Blue
What about using an old calor style gas bottle?

We sell them at my work, and we have some empty big old ones that are surplus, you're very welcome to one of them.

They're just outside Hindhead. 2007 90 Puma - Love it - Best car I have ever owned.

1989 Ninety 200tdi - Love it - Second best car I have ever owned.

1951 80" Series 1 - Love it - Third best car I have ever owned.
Post #814154 8th Feb 2020 9:07am
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