CIPRIANI S020+, User And Maintenance Manual, Page: 41 / 148

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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.
Descaling
• Use a nitric acid (HNO3) or citric acid solution: 1.5% concen-
tration by weight, max. temperature 65°C (1.5% by weight
corresponds to 1.75 l of 62% HNO3 for 100 litres of water)
or a polyphosphate solution (NaPO4 or Na3PO4): 1.5% max.
concentration by weight, max. temperature 50°C.
Degreasing
• Degrease stainless steel or titanium plates with a sodium
hydroxide (NaOH) solution: 1.5% max. concentration by
weight, max. temperature 65°C (1.5% by weight corre-
sponds to 3.75 l of 30% NaOH for 100 litres of water).
• Do not use hydrochloric acid or water with a chloride con-
tent of over 300 ppm to clean stainless steel plates.
• Do not use phosphoric acid to clean titanium plates.
Deposits:
Calcium
Recommended detergents: 4% nitric acid solution at 60°C
max. - 4% citric acid solution at 60°C max.
Oils and greases
Recommended detergents: paraffin or kerosene (as these
fluids may damage NBR and EPDM gaskets, limit the con-
tact time to no more than 30 minutes)
Sludges, metal oxides
Recommended detergents: 8% nitric acid solution at 60°C
max. - 4% citric acid solution at 60°C max.
Organic matter
Recommended detergents: 2% sodium hydroxide solution
at 40°C max.
5.6 - Liquid penetrant testing
• Corrosion, galvanic coupling and erosion can create holes in
the plates. As such damage is not always visible to the na-
ked eye, we recommend performing liquid penetrant tests
to check for holes or microcracks. CIPRIANI’s technical sup-
port team can advise you on the appropriate products.