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CALIBRATION 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

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CALIBRATION INTERVALS

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  1. CALIBRATION INTERVALS This Presentation focus’s on determining intervals for work performed in accordance with NAVSEA Standard Items

  2. 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

  3. Calibration Interval Goals • OPNAV INSTRUCTION 3960.16B, 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.

  4. 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

  5. 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.

  6. Section 1 info on Panel and Switchboard Meters

  7. 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.

  8. Section 2 info on Panel and Switchboard Meters

  9. METRL Sections on Intervals(cont.) • Section 3 Interval by Manufacturer and Model • Query database where specific model number is entered

  10. Section 3 Model Specific

  11. 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

  12. 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.

  13. 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.”

  14. 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-Z540-3 and NCSLI RP-1-1996 provide guidance on analytical methods of determining intervals • The goal is 72-85% EOPR.

  15. QUESTIONS?

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