1. About FYOU PMEC

FYOU PMEC are authorized to represent theproducts of the top one API Gauge manufacturer in China, which are subsidiaryfacilities of state-owned corporations and are API licensed. All the gaugescome with the calibration certificates traceable to NIM (National Institute ofMetrology, China ) and valid for API audit. To find out more information on ourproducts, pleasecontact us by e-mailing:edwin@szfyou.com. We try to provide the bestpossible solution for you as quickly as we can.

2. About the API and the quality request

The American Petroleum Institute (API),head quartered in Washington, DC, USA is a world leader in the development ofstandards for all aspects of the oil and natural gas industry. When using APIsanctioned gages for the inspection of products or calibration of other gages,it is critical that the user have a high quality gage, manufactured using thelatest manufacturing and inspection technology available.  Gages should be manufactured so that theymeet or exceed API specifications.

3.About the Calibration Certificates.

Each API working gage shall beaccompanied by a certification listing the values with dimensions measured foreach critical element, as well as a measured standoff to a certified mastergage.  Each API master gage shall beaccompanied by a certification from an API qualified agency such as theNational Institute of Metrology (NIM) located in Beijing, China, the NationalInstitute of Standards and Technology (NIST) located in Gaithersburg, Maryland,USA, or the National Physical Laboratory (NPL) located in the United Kingdom asdescribed in the API specifications.  ForAPI Specification 5B, the API approved certifying agency shall perform a fullinspection on all critical elements as well as a mating standoff, and provide areport detailing the results of the inspection.

For API Specification 7, the API approved certifying agency shall perform afull inspection on all critical elements as well as a standoff against theappropriate regional or grand master gages and a mating standoff.  A certification shall be provided detailingthe results of the inspection.

4. About the API Gage Tolerance.

The gage tolerance defined by API isdesigned to allow the gage manufacturer tolerance for manufacturing the gagewhile still providing the end user with tolerance for wear of the gage. Due tothe desire for maximum wear life of gages, it is often requested that gages bemanufactured on the plus side of the tolerance. Manufacturing to the plus side of the tolerance does not always providedesirable results.  It is possible thatmanufacturing to the plus side of the tolerance will lead to one laboratoryperforming inspection and standoff near the maximum limit while anotherlaboratory, using different master gages will find that the gages exceed theallowable tolerances and they will question the validity of the gages. Thissituation can arise very easily for API Specification 5B gages because thetaper ratio is 16:1 and even small differences in diameter can result in largedifferences in standoff.  For thisreason, it is FYOU PMEC’  practice toprovide all gages as close to nominal size as possible.  When there is a difference between the APIaccredited manufacturer’s reported results and another API accreditedlaboratory’s reported results, it does not mean that the gages are out oftolerance and should be rejected.  Itsimply means that the two inspecting laboratories have master gages whichdiffer in size from one another.  Incases such as this, the inspection results provided by the API accreditedmanufacturing and inspection facility should be accepted and used with thegages.  It is also recommended that theresults provided by the local laboratory be recorded for future comparison whenchecking for wear. Manufacturers of product threads shall conform to the gaugingrequirements as stated in API Specification 5B, Fifteenth Edition, April 2008Paragraph 6.1.2.