In the latest NACE MR0175 there are two component categories “Instrument tubing and associated compression fittings,…” and “Diaphragms, pressure measuring devices and pressure seals.” To which category does the Bourdon tube belong?
Bourdon tubes are not specifically addressed in NACE MR0175/ISO 15156. The Maintenance Panel cannot meet your request to categorize Bourdon tubes between “Instrument tubing and associated compression fittings,…” and “Diaphragms, pressure measuring devices and pressure seals.”
In all cases the material selected must be acceptable to the equipment user for their service conditions.
This question is in relation to NACE MR0175/ISO 15156-3 A.2.2, Table A.4
Reference: ISO 15156 Maintenance Panel Inquiry #2007-01
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