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Tony Lewis wrote:

On 8 Jul 2003 02:01:29 -0700, (NickW) wrote:

I am running oil pipes under a gravel drive where people walk and cars
drive. I was going to put the copper pipe inside some spare MDPE mains
water pipe I've got so it should be well protected.

How shallow a trench could I get away with?

It's not (just) that I'm lazy, I'm also trying to avoid damaging some
propane lines which also run through the same ground. I will have to
cross them at some point. Hopefully they will be buried quite deep.

A neighbour had shallow oil pipes and in the big freeze Winter 95
whilst sunnying in the Caribbean the oil stopped flowing, the boiler
went out, the radiators froze and cracked then the thaw came and they
came home to massive damage.

Yes, but they can more easily freeze above ground....