The PTC Liberty Tubulars Quality Assurance program for manufactured products was developed to meet and exceed the American Petroleum Institute (API) specifications for the manufacturing of casing, tubing, and line pipe. In addition, API sets forth requirements for a quality system which must conform to all requirements as set forth by the API Q1 Program. Many of PTC Liberty Tubulars tolerances are set at one-half of the API requirements.
PTC Liberty Tubulars has developed a Quality Assurance program focusing on five major components:
- Quality Systems – Our quality systems establish compliance with API Q1 requirements for control of documentation, verification, vendor approvals, audits, and implication of product realization from order entry to order completion.
- Metallurgical and Laboratory Oversight – These include steel sourcing, incoming product verification checks, process control checks, and final product validation. This is accomplished by chemical testing, mechanical testing, Charpy impact testing, and microscopic evaluations of weld and steel quality. Metallurgy also establishes heat treating and processing parameters for PTC Liberty Tubulars heat-treat lines and verifies that the proper parameters are met by validation of the process parameters, mechanical testing, and metallurgical evaluation of microstructures. PTC Liberty Tubulars laboratory personnel also secure tube samples and perform collapse testing evaluations of various pipe grades to assure that the pipe can meet or exceed API or customer requirements for resistance to external pressures. We own and utilize the most advanced state-of-the-art collapse testing equipment in the world.
- Quality Control Inspection – Inspection of the products in process includes ultrasonic inspection of the welding process immediately after forming and joining the pipe edges. Destructive testing of pipe rings is performed to verify the pipe is capable of deformation by crushing to a minimum required value as set forth by API standards; after meeting API standards, the samples are crushed completely to further verify performance parameters. Quality Control personnel perform full body electromagnetic inspection of pipe immediately following hydrotest to a specified pressure. A final visual inspection of the pipe is made immediately following the electromagnetic inspection to assure proper dimensional values and straightness of the products. Quality control inspections are also performed on the threaded ends of the pipe to assure that they meet all API and customer requirements for lead, taper, standoff, thread height, ovality, and thread length. Thread inspection includes visual examination in conjunction with comparator evaluation of thread elements and thread profiles.
- Phased Array Ultrasonic Inspection – PTC Liberty Tubulars conducts inspections of 100% of our heat-treated products utilizing our RTIS inspection system. This state-of-the art unit enables PTC Liberty Tubulars to provide the most complete, accurate, and stringent inspection in the industry. Phased array technology gives us the ability to fully inspect the pipe body and the weld-line for each joint. This unit is the most advanced inspection unit known to exist in any mill environment. While some mills are now adopting this technology, we know of no mill adhering to the strict inspection criteria and standards enforced by PTC Liberty Tubulars in the utilization of this equipment.
- Collapse Testing –
PTC Liberty Tubulars has invested in the most advanced collapse testing equipment in the industry that is custom manufactured for PTC Liberty Tubulars . PTC Liberty Tubulars uses 8 times diameter samples to provide a more representative and stringent collapse test for all collapse tested products.