Special Care Instructions - Hupfer SGR Manual Del Usuario

Care and Maintenance

Special Care Instructions

7.4 Special Care Instructions
Resistance to corrosion in stainless steel is provided by a passive layer which is formed on the surface when
oxygen is absorbed. The oxygen in the air is sufficient for the formation of the passive layer inasmuch as
faults or damage to the passive layer can be remedied again automatically by mechanical action.
The passive layer develops or is renewed more quickly when the steel comes into contact with water
containing oxygen. The passive layer can be chemically damaged or breached by agents which have a
reducing (oxygen-consuming) effect when they come into contact with steel at concentrated levels or at high
temperatures.
Such aggressive substances include:
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Substances containing salt and sulphur
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Chlorides (salts)
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Seasoning concentrates (e.g. mustard, vinegar essence, seasoning cubes, saline solutions)
Further damages can occur due to:
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Extraneous rust (e.g. from other components, tools or rust film)
§
Iron particles (e.g. grinding dust)
§
Contact with non-ferrous metals (element formation)
§
Lack of oxygen (e.g. no admission of air, low-oxygen water).
General working principles for handling appliances made of "refined stainless steel":
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Always keep the surface of appliances made from stainless steel clean and open to air.
§
Use cleaning agents suitable for stainless steel. Never use bleaching cleaning agents or any containing
chlorides.
§
Remove layers of lime scale, grease, starch and egg-white by cleaning daily. Corrosion may occur
underneath these layers due to lack of air absorption.
§
Once the appliance has been cleaned, remove all cleaning agent residues by wiping thoroughly with
plenty of water. The surface should be thoroughly dried after wiping.
§
Do not bring items made of stainless steel into contact with substances such as concentrated acids,
seasonings and salts for longer than is absolutely necessary. Acid fumes emitted when tiles are cleaned
also cause corrosion in "refined stainless steel".
§
Avoid damaging the surface of the stainless steel, especially by bringing into contact with metals other
than stainless steel.
§
Residues from other metals produce extremely small amounts of chemical elements which can cause
corrosion. Contact with iron and steel must be avoided at all costs, because it will cause extraneous rust.
If stainless steel comes into contact with iron (steel wool, steel particles from pipes, water containing
iron), this can trigger corrosion. Therefore, only use refined steel wool or brushes with natural, plastics or
refined steel bristles only for physical cleaning. Steel wool or brushes with unalloyed steel cause
extraneous rust due to abrasion.
4330053_A7
Section 7
Page 33
Belt Conveyor System
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