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Piping and Valves4
4.2.4
Installation
4.2.4.1
Installation type
For the direction of flow and the
suitability for vertical and/or
horizontal installation, please
refer to section 4.2.2.3.
4.2.4.2
Installation positi-
on
The installation position is
determined by:
The function of the valve
Functional framework
conditions
Accessibility and operability
These three criteria are of equal
importance when selecting an
installation position for a valve.
All of them have to be taken into
account for an acceptable project
solution.
Function of the valve
The first point to consider when
selecting an installation position
for a valve is its operational
The following examples serve to
illustrate this point:
The gate valve at the discharge
side of the pump serves to
close the pipe if the pump or
swing check valve needs to be
repaired. It should ideally be
located immediately
downstream of the pump and
swing check valve. However,
the functional framework
conditions (maximum fluid
level in the pump sump) and
the operability require a
different (higher) position.
The swing check valve should
ideally be located directly
downstream of the pump, as
mentioned above. Again, the
fluid level and accessibility
demand a more practical
location in the piping.
The position of the aeration
and vent valve should always
be selected from an
operational point of view,
which is at the highest point of
the piping. Suitable structures
to provide accessibility must be
provided.
Functional framework
conditions
The installation position can be
determined by functional
framework conditions.
For example:
Installation criteria provided
by the valve manufacturer
(vertical/horizontal)
Routing of the discharge line
If the discharge line has a long
vertical section, the swing
check valve must not be
installed at a low position in
the vertical pipe axis as the
function of the swing check
valve will be impaired by
deposits of contamination
(sand, stones, sludge). Stones
falling back down onto the
valve could also cause some
direct damage. In this case, the
swing check valve should be
fitted in a horizontal pipe
section which has to be
planned for in the piping
layout.
Maximum fluid level
Individual discharge lines
joining collecting lines
66