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Verification Services
What is Verification?
In tape verification, the bob and tape will be assigned a serial number, but the certificate that accompanies verified tapes and bobs indicates it is within the required tolerances, rather than giving specific readings.
Verification requires traceability, but does not require the detailed pedigree. It is a confirmation that the equipment checked against a traceable standard is within tolerances as specified by the API standards.
Gauging Tapes and Bobs
A Working Tape/Bob is required to be checked and verified per API standard 3.1.A for accuracy as follows.
"The working tape with bob attached should be checked for accuracy when new and at least annually thereafter by comparison with a master tape that has been certified by or traceable to the National Institute of Standard and Technology (NIST).
W.L. Walker Company provides this service. For verified tape and bob sets please fill out the appropriate form found on the
Forms Page.
How Tapes are Verified Video