Page 5 - Introduction

Don’t leave it to chance, get it right first time, if you think it’s expensive to hire a
professional wait to you count the costs of hiring a amateur.
Contact us on Skype/Phone: +44 (0) 161 8188974, Mobile: +44 (0) 7488298027,
email: paul.mcmullan@subtechengineers.com

Sewage Pumps
There are many makes and models of sewage pumps on
the market each claiming to be the best.
The best guide we can recommend is the Sewage for
Adoption guidelines, even if your application is not for
adoption.
It's a bit long winded, but worth a read, it has been
compiled by the Regional Water Companies who have
learned from there past mistakes, the mistakes you are
trying to avoid.

If you follow the guidelines of
SfA You will not be far wrong.
Section D5.4 Refers to the
Hydraulic Design of the Station
section F is the mechanical and electrical specifications, table F1
shows the recommended solids handling performance for the pumps,
I would strongly recommend that you adhere to this if you want a
trouble-free installation.

The free ball passage on a sewage pump is very important as a rule, Ø80mm
pumps is the smallest that should be used on sewage application (unless your
using a macerator pump) SfA Recommends that the minimum free ball passage
on an Ø80mm pump should be Ø60mm this goes up as the pump discharge
increases. Pumps with vortex impellers normally have the best free ball
passage, but certain open single channel are also good and today many
manufactures use a variety of different designs to prevent pump blockage.

Each regional water company have their own amendments to SfA, to suit
their own requirements, nearly all will require
the pumps to be installed on a guide rail system
for quick and easy installation and removal.
Some will require the pumps to be Atex rated,
if this is the case be sure to ensure that the
controls entering the zone (chamber/sump)
are Atex rated as well or are wired via a
IS barrier. (see our section regarding
control panels)

For application with high heads and
you need the ability to run a Ø50mm
rising main, then macerator, cutter,
grinder pumps are what you need,
as their name indicates they cut,
macerate any solids to enable it to
be pumped up smaller bore pipe work,
these can be free standing or installed
on a guide rail system

That’s what we do, we can take away the problem of design, selecting the right pump for the right
job, if you have not got a sump/chamber yet we can sort that too.