Velocity Edge GX325 Manual de usuario descargar pdf (Pagina 38)

Plate Cleaning Tips

1. Do not use hydrochloric acids, or water containing in excess

of 300 ppm chlorides, with stainless steel.

2. Do not use phosphoric or sulfamic acid for cleaning

titanium plates.

3. Limit cleaning solution concentration to 4% in strength, with

temperatures not exceeding 140°F unless otherwise speciﬁ ed.

General guidelines for cleaning are tabulated below. (Please refer

to steps 1 through 3 above for precautions.)

Cleaning-In-Place (CIP)

Cleaning-in-place is the preferred cleaning method when

especially corrosive liquids are processed in a SUPERCHANGER

unit. Install drain piping to avoid corrosion of the plates due

to residual liquids left in the unit after an operation cycle. (See

Figure 47.)

To prepare the unit for cleaning, follow the procedures listed

below:

1. Drain both sides of the unit. If it is not possible to drain,

force liquids out of the unit with ﬂ ush water.

2. Flush the unit on both sides with warm water at

approximately 110°F until the efﬂ uent water is clear and

free of the process ﬂ uid.

3. Drain the ﬂ ush water from the unit and connect CIP pump.

(See “Plate Cleaning Tips” above for suggested cleaners.)

4. For thorough cleaning, it is necessary to ﬂ ow CIP

solution bottom to top to insure wetting of all surfaces

with cleaning solution. When cleaning multiple pass units,

TYPE OF FOULING SUGGESTED CLEANERS

Calcium Sulphate, Silicates Citric, Nitric, Phosphoric or Sulfamic Acid

Calcium Carbonate 10% Nitric Acid (1 volume concentrated

Nitric Acid with speciﬁ c gravity 1.41 to 9

volumes of water), Oakite 131

Alumina, Metal Oxides, Silt Citric, Nitric, Phosphoric, or Sulfamic Acid

(To improve cleaning, add detergent to acid.)

Barnacles, Mussels, Seaweed, Wood Chips Back ﬂ ush per cleaning-in-place procedure

below and Figure 48

Biological Growth Sodium carbonate or sodium hydroxide

Figure 47

Cleaning-in-place ﬂ ow chart.

Figure 48

Piping using brine (top view).

CAUTION: If brine is used as a cooling medium,

completely drain the ﬂ uid from the unit and ﬂ ush the

unit with cold water prior to any cleaning operation.

Corrosion will be kept at a minimum if all traces of

brine are eliminated before using hot cip solutions

on either side of the heat exchanger.

it will be necessary to reverse ﬂ ow for at least 1/2 the cleaning

time to wet all surfaces.

5. For optimum cleaning, use the maximum ﬂ ow rate of water,

rinse, or CIP solution that the CIP nozzle size will allow (2

in. @ 260 gpm, 1 in. @ 67 gpm.) A CIP operation will be

most effective if performed on a regularly scheduled basis

and before the unit is completely fouled.

6. Flush thoroughly with clean water after CIP cleaning.

Return

Process

supply

pH probe

to monitor

cleaning

procedure

CIP cleaning

solution tank

Self-priming

pump

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Velocity Edge GX325 Manual de usuario Pagina 38

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