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TECHNICAL
Q: If I have an isolating valve at
the geyser, what else should I
keep in mind?
By
Patrick Gordon, General Manager of Calafrica (Pty) Ltd
Plumbing Africa will extract from various WhatApp groups the niggling
questions that come up again and again. In this issue is the question of
isolating valves.
A: There is a basic rule that must be kept in mind with
all geyser installations. You are not allowed to have an
isolating valve between the geyser and the Pressure
Relief Valve. In most installations that have been
correctly plumbed for balanced pressure, the Pressure
Reducing Valve and the Pressure Relief valve is situated
outside the building to facilitate ease of installation. If an
isolating valve is now placed near the geyser, this would
cut off the path of relief for the geyser. This installation
would not comply to SANS 10254.
How could I keep the installation as is
but make it compliant? This is easier
that what you would think. All you
must do is to fit a Pressure Relief Valve
between the geyser and the isolating
valve. Just remember that this valve
must be fitted over the geyser tray and
must be piped out according to the
rules set out in SANS 10254.
P Gordon
Typical isolating valve.
www.plumbingafrica.co.za @plumbingonline @plumbingonline @PlumbingAfricaOnline October 2020 Volume 26 I Number 08