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5.3 - Manual cleaning

• Always wear safety glasses and protective

gloves and follow the instructions for the

cleaning products used.

• Dispose of wastewater in accordance with

prevailing environmental protection regulations.

• Never use metal tools, abrasives, or

corrosives.

• Use a soft, non-metallic brush and suitable

detergent.

• A pressure washer may be used provided

the necessary precautions are taken to avoid

damaging the gaskets.

• Soak the plates in a detergent solution if they

are coated with thick deposits.

• Thoroughly rinse the plates, and especially

the gaskets, in cold or lukewarm water.

• Degrease the plates before reinstalling them,

especially if one of the fluids circulated is a

lubricant (e.g. oil).

• Carefully check the condition and sealing

surfaces of the gaskets, the flatness of the

plates, and the overall cleanliness.

5.4 - Clean in place (CIP)

• CIP is recommended if the heat exchanger

requires frequent cleaning or is hard to

disassemble.

• CIP can be performed provided it is

impossible for particles to build up inside the

heat exchanger. Likewise, if there is a

risk of the surfaces of the plates being

damaged by particles, manual cleaning should

be performed.

• The CIP procedure must be determined with a

specialised firm when the system is designed.

• After the first few cleanings, it may be

necessary to open the heat exchanger in order

to check the degree of cleanliness, adjust the

cycle time and determine the best product

concentrations.

Procedure

1) Completely drain all the circuits (if this is not

possible, run fresh water through the circuits

until the process fluids have been completely

flushed out).

2) Clean with fresh water (with a low chloride

content for the stainless steel plates) at a

temperature of around 40°C to eliminate all

traces of the process fluids. Run this water in

the opposite direction of normal operation. An

even better result can be obtained by running

the water alternately in one direction and then

the other (this is advised for steam applications

or to eliminate residues such as fibres and

particles). The use of filters upstream of the heat

exchanger will reduce the need for this.

3) Completely drain the water from the circuits

and connect the CIP unit. Do not let the solution

sit in the exchanger.

4) For even better cleaning, use a centrifugal

pump installed between the CIP and the heat

exchanger. Circulate the detergent solution in

the direction opposite that of the fluids so as to

eliminate all traces of dirt.

5) Circulate a quantity of detergent solution

at above the nominal mflow rate but without

exceeding the maximum allowable flow rate

(determined by the nominal diameter).

6) Thoroughly flush both circuits with fresh water.

5.5 - Detergents

• Never use hydrochloric acid (HCl) or

chlorinated compounds with stainless steel.

• Never use phosphoric acid with titanium.

• Suitable detergents may be obtained from

specialised firms. Specify the plate and gasket

types to obtain a detergent that will not remove

the protective oxide layer on the plates or

destroy the gaskets.

• Nitric acid (HNO3) and sodium hydroxide

(NaOH) may be used to clean stainless steel

and titanium plates.

• Polyphosphates may also be used.