Standard Calibration Procedure

Standard Calibration Procedure

Test Subject: NPT Ring Gage

Procedure #: QSCP- 91

Revision #: 1.0

Date: 11/2/2011

Approval: James Cagle

1.0  Purpose

1.1  To establish a standard procedure for calibration of NPT Ring Gages.

2.0  Requirements

2.1  The calibration laboratory shall be furnished with all items of equipment (including reference materials) required for the correct performance of calibrations and tests. In those cases where the laboratory needs to use equipment outside its permanent control, it shall ensure that the relevant requirements of this section are met.

2.2  All measuring and testing equipment having an effect on the accuracy or validity of calibrations or tests shall be calibrated and/or verified before being put into service. The laboratory shall have an established program for the calibration and verification of its measuring and test equipment. The program will ensure the recall or removal from service of any standard or equipment that has exceeded its calibration interval or is otherwise judged to be unreliable.

2.3  The laboratory shall use appropriate methods and procedures for all calibrations and tests and related activities within its responsibility (including sampling, handling, transport and storage, preparation of items, estimation of uncertainty of measurement and analysis of calibration and/or test data). They shall be consistent with the accuracy required and with any standard specifications relevant to the calibrations or tests concerned.

2.4  The laboratory shall have documented instructions on the use and operation of all relevant equipment, on the handling and preparation of items, and for calibration and/or testing, where the absence of such instructions could jeopardize the calibrations or tests. All instructions, standards, manuals and reference data relevant to the work of the laboratory shall be maintained up-to-date and be readily available to the staff.

3.0  Referenced Documents

3.1  ISO 17025

3.2  NIST Handbook 150

3.3  NIST Technical Note 1297

3.4  ANSI/NCSL Z540-1

4.0  Materials Required

4.1  Correct size NPT Master Set Plug.

4.2  Lubricating oil

4.3  Lint free cloth

4.4  Certifi Software

5.0  Tolerance / Measurement Range / Measurement Uncertainties

5.1  Tolerance for an NPT Ring Gage is acceptable if measured result is +/- one third of a turn from the NPT Master Plug Gauge Basic Notch

5.2  If the tolerance is specified by the customer or if there is some functional characteristics that require tolerances other than specified above, these considerations should govern the acceptability of the results.

NOTE: where applicable, the methodology of the Guide to Expression of Uncertainty in Measurement 1993 shall be used as the basis for expression of uncertainty of the measurement. Where detailed procedures are not used to quantify and combine uncertainties (i.e. use of test accuracy ratio concepts) the sources of uncertainty shall be tabulated and demonstrated to be acceptable for the measurement undertaken.

6.0  Procedure

6.1  Clean NPT Ring Gauge and NPT Master Plug Gage to remove any foreign objects.

6.2  Inspect the NPT Ring Gauge for nicks or damage on the threads.

6.3  Lubricate the gages with light oil.

6.4  Assemble the NPT Ring Gage into the NPT Master Plug Gauge with hand tight pressure.

6.5  Take a measurement from the NPT Master Plug Gage Basic Notch to the NPT Ring Gauge Large End Face.

6.6  Record this measurement in your calibration record.

6.7  Print all documentation, and prepare Calibration Certificate.

6.8  QA Manager to review all documentation.

6.9  Place Calibration sticker on equipment.

6.10  Prepare all collection/shipment documents and contact customer.

6.11  Place M&TE in outgoing area with customer name clearly visible.

7.0 Records

7.1 The records for item requiring calibration shall include an individual record of calibration or verification, or other means of control. This record shall provide a description or identification of the item, calibration interval, date calibrated, identification of the calibration source, calibration results (data and/or condition status) and calibration action taken (adjusted, repaired, new value assigned, de-rated, etc.).

8.0 Calibration Status

8.1 Item shall be labeled to indicate calibration or verification status. The label shall identify specific date calibrated (date, month, year, Julian date, or equivalent) and the specific calibration due date or usage equivalent. Items not calibrated to their full capability or which have other limitations of use, shall be labeled or otherwise identified as to the limitations. When it is impractical to apply a label directly to an item, the label may be affixed to the instrument container or some other suitable means may be used to reflect calibration status. Tamper resistant seals are affixed to operator accessible controls or adjustments, which if moved will invalidate the calibration. The quality system shall provide instructions for disposition of equipment with broken tamper resistant seals.

9.0 Storage and Handling

9.1 Items shall be handled, stored, and transported in a manner which shall not adversely affect the calibration or condition of the equipment.

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