Installation; Installation Of Calorimetric Monitoring Heads; Selection Of Material - Flow vision FC100 - CA User Manual

Flow Meter | FC100-CA

INSTALLATION

2 Installation

2 . 1 Installation of calorimetric monitoring heads

These are general directions for the application of calorimetric measuring heads which from application
to application should be reviewed by the user in accordance with individual requirements.

2 . 1 . 1 Selection of material

Stainless steel 1 .4571/AISI 316 Ti
The standard monitoring head material is stainless steel 1.4571/AISI 316 Ti, an austenitic, acid-resisting
stainless steel that is commonly used throughout industry. Manufacturers claim it also withstands
oxidizing organic and anorganic acids, and partly even reductive media.
The resistance of this stainless steel should however be verified by the user, particularly when it is
used in medium mixtures that may from time to time be exchanged with cleansing agents. Its chemical
resistance also depends on temperature, flow rate and concentration of the medium.
Stainless steels owe their resistance to rust mainly to their alloy combination with chromium, the
formation of chromic oxide on the steel surface resulting in a passive state. Contamination, deposits
on the surface, or foreign rust may however neutralize the passivity. Therefore care should be taken
to keep the surfaces clean.
Stainless steel heads must not get in contact with steel parts other than stainless steel or with che-
mically dissimilar metals, as this would cause electrolytic corrosion.
Nickel-based alloy (Hastelloy 2 .4610)
Hastelloy 2.4610 is a material with a chemical resistance generally exceeding that of stainless steel.
They are particularly suitable for alkaline media (pH > 7). They should however be examined for
suitability for each specific application using resistance tables and empirical values.
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