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.
Hmm.. That might do!
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.
The fill pipe could be a sliding fit in the lid and your *hatch
plate* outlet extended and insect proofed above planned water level.
So far, I have not found a bulkhead or tank connector adaptable to
68mm although I take the point that the plastic can be stretched with
the 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.



--
Tim Lamb