CALIBRATION INTERVALS This Presentation focuss on determining intervals
CALIBRATION INTERVALS This Presentation focus’s on determining intervals for work performed in accordance with NAVSEA Standard Items
Intervals › Goals in selecting intervals › NAVY METCAL Rules for Intervals › Metrology Requirements List (METRL) Sections and Content Related to Intervals › NAVY issues with Intervals › What the NAVY would like to see for Intervals › Contractor Options
Calibration Interval Goals › OPNAV INSTRUCTION 3960. 16 B, 7 Nov 17 – End of Period Measurement Reliability (EOPR) › The Navy goal is for Test Instruments to still be in tolerance 85% of the time when calibration is due. › The absolute minimum acceptable is 72% of the time.
METCAL RULES › Interval Order of Precedence › METRL is authoritative except as follows: – Navy Nuclear Propulsion Specific cited in Tech. Manuals – Trident/Poseidon Preventative Maintenance – Installed Instruments and other Instruments covered by PMS or SISCAL › PMS guidance to submit each overhaul is not considered a finite interval so METRL takes precedence – Installed instruments covered in OP’s, OD’s, SWOP’s for Special Purpose Test Equipment take precedence except for Navy Nuclear
METCAL RULES (cont. ) › Model Specific Intervals may have unique SYSCOM intervals –NAVAIR, NAVSEA, SSP METRL Sections on Intervals › SECTION 1 -The General Information Section. – Provides a lot of good general information – Makes recommendations on interval if specific information is not available elsewhere.
Section 1 info on Panel and Switchboard Meters
METRL Sections on Intervals (cont. ) › Section 2 GENERIC INTERVALS – Provides a list by type (or generic class) and a recommended interval. – The list is to be used when the specific model number and manufacturer are not listed in Section 3 – Presence of an Interval in Section 2 does not mean that a specific instrument is used for Quantitative Measurement or that it requires calibration.
Section 2 info on Panel and Switchboard Meters
METRL Sections on Intervals (cont. ) › Section 3 Interval by Manufacturer and Model – Query database where specific model number is entered
Section 3 Model Specific
NAVY issues with Intervals › A wide range of intervals were being noticed during checkpoints etc. for Contractor instrumentation › During audits Contractors did not have a system to determine intervals › While METRL Section 3 would provide Model Specific Intervals, the intervals varied with each METRL revision – Always in tolerance extend the interval – Not in tolerance 72% of the time shorten the interval
What the NAVY desires for Intervals › Use intervals that do not exceed the Navy’s for items used during system acceptance testing. › Use Generic Intervals using Section I and II for guidance. › Use a 6 month Cal Interval on gauges used in a portable manner. › The Navy has no issues with reduced intervals from METRL only extended ones.
NAVY Desires Review › First -- Section II Generic using Section I as a supplement. › Then, if an interval can't be established using generic descriptions, default to Section III (by model number). › Finally, if an interval can't be established using Sections I, II, or III -- develop your own interval. – “If I encountered such a situation as an auditor, I ask how the interval was arrived at. I would expect an answer that involved a systematic approach and minimized risk that was documented. ”
Contractors Options › Navy guidance only applies to the Navy’s equipment and your equipment used for Navy system acceptance testing. – You can mark items used for acceptance testing and get Navy Intervals on those instruments. › ANSI-Z 540 -3 and NCSLI RP-1 -1996 provide guidance on analytical methods of determining intervals – The goal is 72 -85% EOPR.
QUESTIONS?
- Slides: 15