On 07/06/2021 08:46, Tim Lamb wrote:
In message , Fredxx
writes
On 06/06/2021 21:52, Tim Lamb wrote:
Snippage.
https://www.plasticdrainage.co.uk/ac...nd-downpipe-bl

ack.html

The access plate would make a handy template for making the holes.
Â*Hmm.. That might do!
Â*The tank is an ancient rectangular 4' x 3'6 x 3'6 riveted galvanised
steel construction I have been using as a secure chemical store after
fitting a hinged lid. The exterior is sound but the inside had some
rusting hence the glass fibre.
Â*The fill pipe could be a sliding fit in the lid and your *hatch
plate*Â* outlet extended and insect proofed above planned water level.
Â*So far, I have not found a bulkhead or tank connector adaptable to
68mmÂ* although I take the point that the plastic can be stretched
with theÂ* application of heat.

IBCs (Intermediate Bulk Container Tank) are cheap and don't rust, plus
if translucent you can see the water level. Just a thought.

Indeed. 1000L and there are numerous adapters available for piping the
threaded outlet.
However, I already have an almost suitable, larger tank:-) Left over
glass fibre kit and the potential satisfaction of re-purposing a large
lump of otherwise scrap steel.
Currently the collected rainwater goes to a soakaway.

Can you insect-proof the top of the drain pipe?

I have lots of fine mesh plastic netting bought to protect garden
produce for tank vents. Gutter and down pipe not practical but I assume
insects lay their eggs in standing water.

A film of oil tends to stop that! It does mean the overflow must dip
below the surface and have a anti-syphon feature