19
Spare Parts
Only use original spare parts to assure reliable operation.
When ordering spare parts, always mention type and serial number of the pump.
Mechanical seals and O-rings are to be kept in a cool and dry space without
temperature fluctuations. It is advisable to have the mechanical seal and O-rings in stock
as a spare part.
Internal Cleaning
GSP pumps are de signed to be CIP-cleanable (cleaning in place). Several tests have
shown they are as cleanable as a tube with the same diameter of the pump and a
roughness Ra = 0.8 µm.
Pumps are used for several liquids. This makes it impossible to give a general valid CIP
cleaning procedure. The efficiency of the cleaning procedure has to be checked during
the valida tion of the installation in which the pump is in corporated. The following are
some general rec ommendations.
Warning: It is important to check if the internal seals of the pump are resistant to the
cleaning media. If steam is used during one of the cleaning phases, the pump must not
run at the same time. Check if the elastomers used are steam resistant.
Product expelling phase - With gas (N
2
in the pharmaceutical industry and CO
2
in the
bev erage industry) or liquid (water or solvent) the rest of the product can be removed
out of the pump and piping. If the system is blown empty with gas, the pump first must
be switched off to prevent dry run ning.
Pre-rinse - The pre-rinsing is done with hot solvent or liquid (45 – 55 °C) in the food
industry. In the food industry, hot water prevents the residue hardening (fat), whereas
higher temperatures lead to denaturising of proteins, which are very difficult to remove.
Pulsating the liquid flow (switching on and off the pump) can im prove the cleaning. The
pre-rinsing liquid is nearly always drained. The pre-rinse can be done with tap water
and is very important because it can remove most of the residue.
Cleaning with detergent and alkali - This cleaning has to remove the organic or inor-
ganic dirt based on the chemical or physical action of the detergent. The residue has to
be desolved in the cleaning liquid. The return temperature is normally approximately
75 °C and the lye concentration between 0.5 and 3 %. Most of the residue is loosening
early in this phase. The cleaning can be done with tap water. Since the wash-step is
based on the solution of residue, the temperature of the water and detergent mixture is
very im portant. If sequentially an alkaline and acid cleaning is used, normally there is a
rinse in between.
Acid cleaning - Acid cleaning is used for re moval of inorganic residue and normally only
oc casionally necessary. Often, inorganic acids are used with a concentration between
0.5 and 3 %. The temperature is less than 65 °C. Afterwards a rinse is done with
luke warm water.
After rinse - The reason for the after rinse is to remove all loosened residue and
detergent.
Disinfection - The disinfection reduces the number of toxic micro-organisms to an
ac ceptable level. However, the disinfection does not guarantee full sterility and is only
sensible after a good cleaning.
After rinse - The after rinse has to be done with germ-free water with a total hardness
below 5 °D (90 mg/l CaCO
3
). The after rinse water is often used for pre rinse.
Summary of Contents for GSP Series
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