Velocity Edge GX325 Manual de usuario descargar pdf (Pagina 39)

Often, when ﬁbers or large particulates are present, back ﬂush-

ing of the unit proves to be very beneﬁcial. This is accom-

plished by either of the following methods:

1. Flush the unit with clean water in reverse ﬂow pattern to

the normal operating direction.

2. Arrange piping and valves so the unit may be operated in

reverse ﬂow mode on the product side for ﬁxed periods of

time. This method is particularly well suited for steam-to-

product units.

3. The use of strainers are recommended in supply lines

ahead of the exchanger when the streams contain signiﬁcant

solids or ﬁbers. This will reduce the requirements for

back ﬂushing.

Cleaning Guidelines

1. Never open the unit when hot, under pressure, holding

liquid or operating.

2. Never clean the plates with a steel brush or steel wool.

3. Always wipe the gaskets clean before closing the

unit to prevent damage resulting from adhering

particulate matter.

4. Always use clean water (free from salt, sulphur,

chlorine or high iron concentrations) for ﬂushing and

rinsing operations.

5. If steam is used as a sterilizing medium, do not exceed

270°F steam temperature with nitrile gaskets and 350°F

with EPDM gaskets.

6. If chlorinated solutions are used as the cleaning media,

employ a minimum concentration at the lowest temperature

possible. Minimize the plate exposure time. The chlorine

concentration must be less than 100 ppm and temperatures

must be under 100°F with a maximum plate exposure

time of 10 min. Follow the cleaning recommendations

of suppliers, relative to concentration, temperature and

treatment time.

7. Always add concentrated cleaning solutions to water before

circulating through the unit. Never inject these solutions

while the water is circulating.

8. Remove rusted or pitted areas that appear on the plates with

commercial scouring powder. Follow this by ﬂushing with

clean water.

9. Cleaning solutions should always be circulated with a

centrifugal pump.

10. Do not use hydrochloric (muriatic) acid for cleaning plates.

11. Thoroughly rinse the plates with clean water following any

type of chemical cleaning.

Back Flushing and Strainers

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