Jetson
www.JetsonHVAC.com
80
rate is suitable. Reverse the flow direction
every 30 min if possible. Monitor the
pressure differential. A pressure
differential equal to design criteria
indicates a clean BPHE. Alternatively,
monitor pH. Constant pH value for 30
minutes indicates a clean BPHE. For Scale
132 Copper pH of 3 indicates the need to
renew the cleaning solution, then empty
the BPHE and restart at point 5. The
cleaning time varies, but is estimated to 4-
8 hours.
Stop
10. Flush from the lower opening for 5
minutes before changing direction. Repeat
this operation until no more dirt is flushed
out
11. Empty the BPHE and the machine, handle
the used solution properly
12. Flush the BPHE with water starting from
the lower opening until pH 7
13. To pickle and passivate steel use 2%
phosphoric acid at 50°C (120°F) for 4-6 h.
14. Flush the BPHE with water starting from
the lower opening until pH 7
CIP Fluids
Bio Gen Active – Scale 132 Copper
Commercially available Scale 132 Copper
removes lime scale and other carbonates as well as
rust and other metal oxides without the risk of
corrosion.
Organic Acids
Organic acids are less hazardous than mineral
acids, which makes them a good choice for BPHE
cleaning. Organic acids include formic, acetic,
and citric acids, among others, and are commonly
applied at concentrations between 1 and 5 volume
percent.
Formic Acid
Formic acid alone is unable to remove iron oxide
when it's used as a mixture with citric acid or HCl.
Formic acid can be used on stainless steels, it's
relatively inexpensive and can be disposed by
incineration.
Acetic Acid
Dissolves lime scale, but doesn't remove iron
oxide deposits. Since it's weaker than formic acid,
it is preferred where long contact times are
necessary.
Citric Acid
Mild iron contamination can be removed by using
a mixture of 1% each of citric acid and HNO3.
For more persistent contaminations, stronger
solutions must be used.
Bases
Bases have the ability of removing oil, grease and
biological deposits from the heat exchanger
surface and may be applied as a complement
during cleaning. They may also be added at the
end of the cleaning procedure, before the last
rinse with water, to neutralize any acid content
left in the system. A solution of 1-2% sodium
hydroxide (NaOH) or sodium bicarbonate
(NaHCO3) before the last rinse ensures that all
acid is neutralized.
CIP Pumps
Important features:
• The reservoir should be made in acid- and
alkali resistant material.
• The hoses should be made in PVC.
• A reverse flow device enables attack of lime
scale from both directions.
• A heating device enables the CIP solution to
reach much better effect.
• The flow rate capacity depends on the size of
the BPHE.
COMMERCIALLY AVAILABLE CIP
FLUIDS
Bio Gen Active – Scale 132 Copper
Description: Scale 132 effectively removes lime
scale and metal oxides (e.g., rust) without etching
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General