Everything about Standard & Code

  A Mill Test Certificate (MTC), or Mill Test Report (MTR), is issued by a manufacturer to certify the chemical and mechanical features of a product and its compliance to the applicable norms and technical specifications. Typically, Mill Test Certificates conform to the EN 10204 standard and are related to steel products. MILL TEST CERTIFICATE A mill test certificate to EN 10204 shows, generally, the following information: Type of certificate and standard (example EN 10204 3.1 or EN 10204 3.2) Manufacturer name Product name and dimensions Quantity covered by the certificate (example: tons, with heat numbers) Heat numbers and batch number (physically shown on the product as well) Final test result Dimensional measurements, to check compliance with allowed tolerances (example, for steel pipes: diameter, wall thickness, length, straightness) Material grade and applicable specification, including results of chemical and mechanical tests Results of additional tests, like hydrostatic, ultras

  What small hole on BX ring gasket use for by   yudhichen Ring gasket is a device use for sealing connection points in piping or valve system and BOP stacks. This sealing device plays an important role in wellhead pressure integrity since most failure occurred due to fail sealing performance which may lead to cut out connections. API 6A dictated BX ring gasket as a type of ring gasket to be used with type 6BX flanges and type 6BX hubs. BX pressure energized ring gasket was designed for face to face contact of the hubs or flanges. Sealing takes place along small bands of contact between the grooves and gasket OD. Gasket is made slightly larger in diameter than the ring grooves. It is compressed slightly to achieve initial sealing as the joint is tightened. As the design intent of BX design was face to face contact between the hub or flanges, Proper way of installation need to be done in order to prevent vibration and external loads which can cause plastic deformation of the ring and ma

PWHT EXEMPTION REQUIREMENTS IN ASME CODES In order to guess the technical background on PWHT exemption, PWHT exemption requirements in several ASME codes are reviewed. ASME codes suggested that PWHT is not mandatory when the nominal material thickness is not more than the thickness in Table 1.   There was some variation between codes as shown in Table 1, and the reason for this has been not known. There are the general trends that the permitted thicknesses without PWHT is increased with increasing preheat temperature together with reductions in maximum carbon level, and the permitted thickness is decreased with increasing alloy content of steels. Most manufacturers are trying to avoid PWHT based on the Table 1 because there is an economic incentive to avoid PWHT.  REFERENCES   [1] Pingsha Dong and J.K.Hong, "Residual stress relief in post-weld heat treatment", 2008 ASME Pressure Vessels and Piping Conference, PVP2008-61210.  [2] ASME Section III, NX, "Rules for Construct