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NT 1004-H00 10 16 SLS24 i - SLS36 i e
4. CLEAN IN PLACE (CIP) &
STERILISATION IN PLACE (SIP)
4.1 General
On-site cleaning (CIP) of an installation is undertaken by
circulating various cleaning solutions through the equip-
ment parts.
An automated CIP system enables :
• Preparation of the appropriate concentrations for the
different cleaning solutions.
• Re-heating of certain cleaning solutions at the opti-
mum temperature.
• Circulation of the different solutions through the equip-
ment parts to be cleaned.
• Rinsing and drying of the equipment parts.
For the most part, automated CIP systems are an inte-
gral part of process equipments.
Before starting CIP and if the process has not been fol-
lowed by a water flush, care must be taken that a mini-
mum of residual products remains in the piping and in
the pump. The SLS Series pumps, thanks to their excel-
lent suction and compression capabilities, enable redu-
cing the quantities of residual products. This minimises
loss of products, eases cleaning and reduces cycle
times.
The SLS Series pumps are perfectly adapted to all pro-
cesses necessitating CIP. SLS-Series pumps are 3-A
marked units and have been successfully tested for in-
place cleanability according to EHEDG document n°2.
By complying with the installation rules described above,
these pumps will give you entire satisfaction for a long
time.
The start of CIP must immediately follow the end of the
process to avoid any clogging or untimely drying.
Non-compliance with this instruction may lead to rapid
wear of cylinder and piston.
4.2 CIP circuit recommended
In all cases, the pressure at the pump inlet during clea-
ning must not exceed 3 barg (43,5 psig).
The flow through the pump required for optimal cleaning
is
40 - 45 m
3
/h
.
This flow corresponds to difficult cleaning (sticky and vis-
cous products). It can be reduced for easier types of
cleaning.
4.3 Pumps arranged in series
This type of assembly is preferred in all cases.
It
ensures optimal cleaning for the pump and makes use
of the special design of the SLS Series, i.e. the possibi-
lity of lifting the piston with the cleaning product.
As the pressure at the pump inlet is higher than that at
its outlet, the piston lifts from the cylinder and permits the
passage of all the cleaning liquid through the SLS Series
pump.
• A centrifuge pump is used for CIP cycles. This pump
is placed upstream of the SLS Series pump.
The centrifuge pump must be installed in series with
the SLS Series pump.
It is preferable not to run the SLS Series pump during
CIP although low speed (< 100 rpm) is acceptable by
alternating start/stop operation.
• In certain cases, the flow of the cleaning liquid requi-
red for the installation is higher than that recommen-
ded for cleaning the pump. In this case, a bypass must
be used.
The bypass valve is adjusted to divide the flow bet-
ween the circuit flowing through the SLS Series pump
and the bypass circuit.
SLS Series pump
Max P
3 barg
SLS SERIES PUMPS MUST NEVER BE USED
AS CIP PUMPS.
