https://mynotes14.blogfa.com Material Selection, Welding, Corrosion, NDT fa blogfa.com Thu, 06 Feb 2014 11:04:26 +0330 https://mynotes14.blogfa.com/post/20 Thu, 06 Feb 2014 11:04:26 +0330 mynotes14 mynotes14.blogfa.com/post/20 https://mynotes14.blogfa.com/post/19 RAISED FACE (RF) FLANGE RF flanges seal with a flat gasket, formerly made of asbestos but now made of more environmentally friendly material, designed for installation between the raised faces of two mating flanges (both with raised faces). The raised faces have a prescribed texture to increase their gripping and retaining force on this flat gasket. Some users of raised face flanges specify the use of spiral wound gaskets. Thu, 06 Feb 2014 10:40:00 +0330 mynotes14 mynotes14.blogfa.com/post/19 https://mynotes14.blogfa.com/post/18 8 Special Tests 8.1 Ferrite/Austenite Ratio for Duplex Stainless Steel When the CRA layer is composed of duplex stainless steel the ferrite/austenite ratio shall be measured. The requirements of API 5LC, Section 8.1 shall apply for test methods, test frequency and acceptance requirements. If this test has been performed on CRA tubes used for liner pipe as part of the specification for that material and the results are documented, there is no need to repeat Thu, 06 Feb 2014 10:20:00 +0330 mynotes14 mynotes14.blogfa.com/post/18 https://mynotes14.blogfa.com/post/17 API publications necessarily address problems of a general nature. With respect to particular circumstances, local, state, and federal laws and regulations should be reviewed. Neither API nor any API's employees, subcontractors, consultants, committees, or other assignees make any warranty or representation , either express or implied , with respect to the accuracy, completeness, or usefulness of the information contained herein, or assume any liability or Thu, 06 Feb 2014 09:08:23 +0330 mynotes14 mynotes14.blogfa.com/post/17 https://mynotes14.blogfa.com/post/16 Introduction Pitting resistance equivalent numbers (PREN) are a theoretical way of comparing the pitting corrosion resistance of various types of stainless steels, based on their chemical compositions. The PREN (or PRE) numbers are useful for ranking and comparing the different grades, but cannot be used to predict whether a particular grade will be suitable for a given application, where pitting corrosion may be a hazard. Mon, 16 Dec 2013 12:57:13 +0330 mynotes14 mynotes14.blogfa.com/post/16 https://mynotes14.blogfa.com/post/15 Ethyl silicate zinc-rich primers cure by the reaction of the vehicle with moisture, thereby providing a binder. As relative humidity and temperature vary during the day, so does the rate of cure. A certain minimum degree of cure is necessary prior to top-coating. It has been shown that the degree of cure of ethyl silicate zinc-rich primers can be measured by the chemical changes occurring using diffuse reflectance infrared spectroscopy.2 This solvent rub Sun, 24 Nov 2013 07:13:16 +0330 mynotes14 mynotes14.blogfa.com/post/15 https://mynotes14.blogfa.com/post/14 Most paint has four components: The resin is the main part of the paint which forms a film on the surface. It is typically a non-hazardous component like linseed or acrylic. Solvent keeps the paint a liquid until the solvent evaporates after painting. In oil-based paint, the solvent is derived from a petroleum distillate and can include hazardous ingredients like mineral spirits, toluene and xylene. Fri, 22 Nov 2013 08:16:17 +0330 mynotes14 mynotes14.blogfa.com/post/14 https://mynotes14.blogfa.com/post/13 ypes of face seals O-rings E rings C rings Gaskets End face mechanical seal Metallic Gaskets for Pipe Flanges: ASME B16.20 1- Metal Ring Joint Gasket 2- Spiral-Wound Metal Gasket 3- Metal Jacketed Gasket Thu, 21 Nov 2013 11:22:59 +0330 mynotes14 mynotes14.blogfa.com/post/13 https://mynotes14.blogfa.com/post/12 PSL is "Product Specification Level".In case of PSL-1 impact testing is not mandatory and in case of PSL2 impact testing at 0 deg C is mandatory.There is a difference in Chemical composition requirements between PSL1 and PSL2.In case of PSL1 Yield Stress and UTS demands "min" value whereas in case of PSL2 there is a range of "min" and "max" for YS and UTS. Wed, 06 Nov 2013 08:40:30 +0330 mynotes14 mynotes14.blogfa.com/post/12 https://mynotes14.blogfa.com/post/11 1- Graphitization: Graphitization is a change in the microstructure of certain carbon steels and 0.5Mo steels after long-term operation in the 427°C to 593°C range that may cause a loss in strength, ductility, and/or creep resistance. Graphitization has been found in low alloy C-Mo steels with up to 1% Mo . The addition of about 0.7% chromium has been found to eliminate graphitization. Inspection and Monitoring : removal of full thickness samples for Wed, 30 Oct 2013 12:22:32 +0330 mynotes14 mynotes14.blogfa.com/post/11