I've posted the following in "Building" but thought to copy it here, following the original poster of this old thread who reckoned there'd be useful knowledge here!
I need to have a new bunded plastic oil tank installed, and will be engaging an OFTEC engineer to install the pipework etc. To keep down costs, I'm planning on building the piers and the platform myself. The engineer I had out to look at the job was a bit vague about the building requirements, and the CERTAS engineer who also said it was the customer's responsibility to install (or have someone install) the piers and platform referred me to the OFTEC website. I have now consulted the OFTEC advice/regs:
https://www.commercialfuelsolutions.co.uk/downloads/oftec/T19_base_construction.pdf
but one or two details elude me.
1. Would it be sufficient to build
two piers, one at each end of the platform, or would I need three?
2. I'm thinking concrete blocks laid flat with concrete lintels spaced to support paving slabs to achieve the required width ie one back and front, and one running down the centre to support the inside edges of the slabs. Or should I be planning on a platform made entirely of lintels laid adjacent to each other?
The new oil tank will be located next to the existing redundant steel tanks, on the same concreted yard surface on which the existing piers and tanks were originally built.
(Removal of the existing tanks and utilising their brick piers isn't possible because the regs have changed since they were built, in respect of the distance required from a boundary wall. Also it will be virtually impossible to remove the steel tanks from the location, so I'm leaving them
in situ for the time being)