lrut gwt guided wave technology

API 1104 Welding recommendation for pipeline

Welding Code and standard There are 2 Welding code or standard that widely used in Oil and Gas facilities. ASME Boiler and Pressure Vessel Code (BPVC) section 9 provide welding requirement and specification used for Boiler, Pressure Vessel, Process Piping, Power Piping and other facilities. This section 9 is very famous and well known in engineering, welding and inspection community arround the world. API 1104 The second book is API 1104. This standard covers the gas and arc welding of butt, fillet, and socket welds in carbon and low-alloy steel piping used in the compression, pumping, and transmission of crude petroleum. petroleum products, fuel gases, carbon dioxide, and nitrogen and, where applicable, covers welding on distribution systems. It applies to both new construction and in-service welding.The welding may be done by a shielded metal-arc welding, submerged arc welding, gas tungsten-arc welding, gas metal-arc welding, flux-cored arc welding, plasma arc welding, oxyacetylene welding, or flash butt welding process or by a combination of these processes using a manual, semiautomatic, or automatic welding technique or a combination of these techniques. The welds may be produced by position or roll welding or by a combination of position and roll welding. This standard also[…]

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guided wave ultrasonic testing and LRUT basic

guided wave ultrasonic testing for pipeline inspection in oil and gas industry

Why choose guided wave ultrasonic testing pipeline inspection? LRUT (Long range ultrasonic testing) or sometimes called as GWT (guided wave testing) is becoming commonplace today for ultrasonic pipeline inspection. This technology is used as excellent NDT for the screening tool. Guided wave ultrasonic pipeline inspection offer many advantages such as High productivity (km per day), access required only at discrete locations, carried out with pipe on-line ( not require shutdown) and 100% coverage except for flanges, tees and other large features. This LRUT/GWT technology come as a solution for pipeline inspection problem like restricted access, many lines not suitable for in-line inspection (ILI / pigging inspection), regular UT and RT techniques are typically not cost-effective or typical UT and RT coverage 0.1%. After conduct LRUT/GWT screening and found some anomaly or “indication”, the inspector will dig the anomaly with other NDT tools such as UT scanning or UT Flaw detector. How guided wave ultrasonic testing work? The tools create Symmetric waves that transmitted along the pipe. The waves propagate along, not through, a pipeline. The wave is reflected from changes in the cross-section in a pipeline. The amplitude of the reflection depends on the total change in the pipe wall[…]

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ASME ANSI API ASTM code standard

Code, Standard and handbook in oil and gas industry

Code, Standard, and handbook are terms that are very often heard in the environment of Engineers and professionals working in the oil and gas industry. In general, the standard is a technical definition as well as instructions directed at the designer, manufacturer, operator or user of a piece of equipment. Whereas the Code is a standard that has been recognized by a government agency and authorized by law. So that the Code is stronger and binding because it is a legal document. The Handbook is very detailed and very complete technical information about a particular theme. For example, the ASM Handbook Volume 13 concerning corrosion. In the Handbook explained the basics of the theory of corrosion that is very complete. including the basic theory of how to measure corrosion rates in a laboratory. Whereas ASTM G102 is a Standard for Rates and Related Information from Electrochemical Measurements. If we want to master the science of corrosion, then we must understand the handbook about corrosion. if we want to master and expert as practitioners in calculating corrosion rates, we must understand ASTM G102. Codes and Standards do not provide detailed instructions on a design process, nor do they provide instructions on[…]

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thickess measurement location tml

IDMS integrity database management system best practice – Thickness measurement location TML

Recording Thickness Measurement Location – TML we will continue the previous article about IDMS integrity database management system. Previously we talk about design code and inspection method involved. now will focus on trending of inspection result represented by a term called Thickness measurement location or TML. Thickness Measurement Location records contain various fields that store information to identify a TML. When we create a new Thickness Measurement Location record, we will need to supply information in some of fields. The following information provides various fields that are defined for the Thickness Measurement Location such as TML ID design pressure design temperature corrosion allowance Allowable Stress Design Code Code Year (Allowable Stress Lookup) Material Specification T-min formula Critical thickness structural thickness number of reading nominal thickness inspection date previuos inspection date inspection interval expire date corrosion rate IDMS integrity database management system – understanding Thickness measurement Location – TML trending In practice, the fixed interval of pressure vessel inspection is 5 years. UT inspector takes the measurement shell & head thickness at some locations. we call it as TML, thickness measurement location. an IDMS data entry populates TML readings into IDMS software. IDMS software calculates short corrosion rate, long corrosion rate,[…]

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