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NT 1004-C00 03 18 SLC12 i - SLC18 i - SLC12 i HT - SLC18 i HT 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 SL Series pumps, thanks to their excellent
suction and compression capabilities, enable reducing
the quantities of residual products. This minimises loss
of products, eases cleaning and reduces cycle times.
The SL Series pumps are perfectly adapted to all pro-
cesses necessitating CIP.
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 30 - 35 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 spe-
cial design of the SL Series, i.e. the possibility 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 SL
Series pump.
• A centrifuge pump is used for CIP cycles. This pump
is placed upstream of the SL Series pump.
The centrifuge pump must be installed in series with
the SL Series pump.
It is preferable not to run the SL Series pump during CIP
although low speed (< 100 rpm) is acceptable by alter-
nating 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 SL Series pump
and the bypass circuit.
SL SERIES PUMPS MUST NEVER BE USED AS
CIP PUMPS.
SLC pump
Max pressure
3 barg
(43,5 psig)
