PFI ES-32-2013 TOOL CALIBRATION.pdf

1、PFI Standard ES-32 | Denotes Revision (Revised December 2013) TOOL CALIBRATION Prepared by Pipe Fabrication Institute Engineering Committee All PFI Standards are advisory only. There is no agreement to adhere to any PFI Standard and their use by anyone is entirely voluntary. Copyright by PIPE FABRIC

2、ATION INSTITUTE Dedicated to Technical Advancements and Standardization in the Pipe Fabrication Industry Since 1913 USA 511 Avenue of Americas, # 601 New York, NY 10011 CANADA 655, 32ndAvenue, # 201 Lachine, QC H8T 3G6 WEB SITE www.pfi-institute.org TOOL CALIBRATION PFI Standard ES-32 | Denotes Revi

3、sion (Revised December 2013) 1. Scope 1.1 To verify conformance to the established requirements in the fabrication of piping subassemblies, it is necessary to assure that all tools, gauges, and instruments shall be in good working order operated per manufacturers recommended procedures, and be calib

4、rated as required. 1.2 It is the intent of this standard to provide guidance for establishing the minimum requirements for calibration, accuracy and documentation of equipment used in the inspection and fabrication activities. 2. Definitions 2.1 Calibration - A comparison of a device with a higher r

5、anking reference device traceable to factory standards (when such standards exist) and the adjustment of the device being calibrated to meet permissible tolerances. 2.2 Device - A tool, gauge or other equipment used to determine whether prescribed characteristics have been obtained. 2.3 Reference De

6、vice - A device of higher accuracy used only for calibration of working devices. 3. Devices Subject to Calibration 3.1 Calibrated Devices 3.1.1 Reference devices. 3.1.2 Inspection, examination or testing devices used for final acceptance of a fabrication. 3.1.3 Process control devices, such as tempe

7、rature controlling, recording or indicating devices, electrical meters, etc. 3.2 Non-Calibrated Devices 3.2.1 Non-precision measuring devices, such as measuring tapes, fillet weld gauges, squares, bubble levels, etc., need not be calibrated. However, it is recommended that an initial check be made p

8、rior to issuance for use to detect possible manufacturing errors or defects. 3.2.2 Meters subject to adverse operating conditions (such as meters on welding machines) need not be calibrated, provided other means are established for control of the process. 4. Calibration Frequency 4.1 Table 1 provide

9、s guidance as to the frequency of calibration of selected devices. 4.2 The calibration frequency of devices not specifically listed in Table 1 shall be determined by the fabricator based on the past performance and adjustments required during calibration. 4.3 The intervals given in Table 1 reflect s

10、uggested frequencies and should be adjusted to meet particular needs when necessary. 4.4 Devices which require calibration prior to each use shall be so identified. 5. Calibration Tolerances 5.1 Calibration tolerances should be determined based on the manufacturers published accuracy for the device.

11、 Typical tolerances are shown in Table 1. 6. Control of Calibration 6.1 For work where full Traceability of operation is required, a record shall be maintained for each device. As a minimum, the following information shall be recorded: 6.1.1 Name of the device. 6.1.2 Identification or serial number.

12、 6.1.3 Traceability to national standards, when such standards exist. 6.1.4 Date of last calibration. 6.1.5 Environmental conditions during calibration, when relevant. 6.1.6 As found, as left conditions. 6.1.7 Date of next scheduled calibration. 6.1.8 Identification of the individual or vendor perfo

13、rming the calibration. 6.2 Devices or their container shall be permanently identified, provided such identification does not interfere with the proper operation of the device. Table 1 PFI Standard ES-32 | Denotes Revision (Revised December 2013) Description Suggested Calibration Frequencies Suggeste

14、d Tolerance Primary Standard Gage Blocks Test Bars/Rods Proving Ring Mercury Thermometer Laboratory Hardness Testing Equipment 5 Years 5 Years 5 Years 1 Year 1 Year Factory Stds. Factory Stds. Factory Stds. + 2 F. Factory Stds. Load Load-Set Machines Dynamometers Tensile Test Machines Snubber Test R

15、ing Impact Testing Equipment 3 Months 3 Months 1 Year 6 Months 1 Year 2% 2% 1% 2% 1% Temperature Thermocouple Temperature Recording Instrument Optical Pyrometer Contact Pyrometer 3 Months 6 Months 6 Months 6 Months Greater of 2% or 25F 1% of Chart 1% of Meter 1% of Meter Electrical Tong Tester Volt-

16、Ohm-Amp Meter Potentiometer 6 Months 6 Months 18 Months 1% of Meter 2% of Meter 2% of Meter Pressure Welding Gas Proportioners Pressure Gauge/Recorders Dead Weight Tester 3 Years 6 Months 5 Year 2% Factory Stds. 1% NDE Magnetic Particle Equipment - Yoke Magnetic Particle Equipment - Prod/Coil Ultras

17、onic Equipment* Portable Hardness Testing Equipment* Portable Chemistry Analyzers* Densitometer* 6 Months 6 Months Each Use (Note 1) (Note 1) Each Use (ASME Sec. V) 2% of Meter Dimensional Outside Micrometers Inside Micrometers Ultrasonic Thickness Gauge* Paint Thickness Gauge - Magnetic Paint Thick

18、ness Gauge Electronic Electronic Level 3 Months 3 Months Each Use 3 Months 3 Months 1 Year .002“ .001“ 8% 8% Factory Standards Note 1. These devices shall be verified against two (2) known standards prior to use. *This equipment does not require a calibration sticker. CURRENT INDEX OF 2014-2015 PFI

19、STANDARDS A complete list of PFI members and available membership CHARTER MEMBERS CONTRACTOR MEMBERS ASSOCIATE MEMBERS AFFILIATE MEMBERS HONORARY MEMBERS Associate and Affiliate member contributors Walter Sperko Sperko Engineering Services, Inc. Greensboro, NC Thomas Warrelmann Victaulic Company of

20、America Easton, PA Sheryl Michalak Welding Outlets, Inc. Houston, TX PFI Standards and Technical Bulletins are published to serve proven needs of the pipe fabricating industry at the design level and in actual shop operations. Hence, such needs are continually considered and reviewed by the Engineer

21、ing Committee of the Pipe Fabrication Institute to provide recommended procedures, which have been demonstrated by collective experiences to fulfill requirements in a manner for Code compliance. However, as the PFI Standards are for minimum requirements the designer or fabricator always has the option of specifying supplementary conditions in the form of requirements beyond the scope of the PFI publications.