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UK Spares & Service for SONDEX Plate Heat Exchangers |
We now stock a comprehensive range
of plate and gaskets in the UK, together with many brazed plate
heat exchangers available 'Off the Shelf'.
Our new UK assembly
workshop in Byfleet, Surrey, offers fast delivery times for most
Sondex gasketed plate models up to DN100 port size.
The type designation of the plate heat exchanger and the manufacture number -
which is on the nameplate on the head cover - should be quoted when ordering
spare parts.
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- When ordering plates it is important to mention
the correct pattern code and if it is a Right or Left
plate.
- When
ordering a complete set of gaskets and their glue and
cleaning fluid, quote the manufacture number or the number
of
the drawing.
- When
requesting single gaskets it is important to order
the correct quality.The quality is evident from the diagram
and the colour
marks on the gasket.
- When ordering assembling
bolts measure the old assembling bolts to ensure
delivery of the
right bolt size.
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Cleaning SONDEX Plate Heat Exchangers
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Manual cleaning:
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The plate heat exchanger
is dismantled and the plates are separated from each other.
Use a soft brush and a specialized
cleaning material for cleaning the plates.
If the plates
are covered with scale or other substances, they must be
put
in a vat with a specialized cleaning material.
A wire brush, sandpaper, metal-scraper etc. must not be used.
The plates and the gaskets cannot bear heavy-handed or robust
treatments.
A high-pressure-cleaner can be used but with absolute
care, and never add abrasives.
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CIP Cleaning:
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To use CIP cleaning (cleaning in place) the scaling on the
plates must be soluble. All materials in the circulation system
have to be resistant to the cleaning material.
Cleaning can also be carried out without circulation. This is done
by filling up the plate heat exchanger with a specialized cleaning
material. The cleaning material is then washed out with clean water.
Example CIP cleaning:
- product rests and cooling/heating liquids are drawn off.
- rinse with cold or tepid water.
- warm cleaning fluid circulates.
- rinse with cold or tepid water.
- rinse with water adding a chemical.
- rinse with cold or tepid water.
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Cleaning materials:
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A specialized cleaning material
is needed to remove scaling on plates without damaging the
plates and gaskets. Stainless steel has a passivated (protecting)
film. This film must
not be destroyed, as the film assists in preserving the resistance
of the stainless steel.
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Fitted cleaning materials:
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Oil and grease are removed with a water emulsifying oil solvent
i.e. BP system cleaner.
Organic and grease cover are removed with sodium hydroxide (NaOH)
maximum concentration 1.5% - max. temp. 85oC. Concentration = 5.00
ltr. 30% NaOH per 100 ltr. water.
Stone and limestone are removed with nitric acid (HNO) - max concentration
1.5% - max. temp 65oC. 1.5% concentration = 2.4 ltr. 62% (HNO)
per 100 ltr. water.
Nitric acid also has a helpful build-up effect on the passivation
film of stainless steel.
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Control of cleaning:
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It is important to clean the plate heat exchanger correctly
as it has an effect on performance. The plate heat exchanger
has to be separated for inspection - especially during the commissioning
period. You will get valuable information regarding circulation
times, temperatures and chemical concentrations. Possible ways
in which incorrect cleaning can affect performance:
- circulation quantity too low.
- cleaning time too short.
- chemical concentration too low in comparison to the scaling of
the plates.
- running intervals too long between cleaning.
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