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The descriptive term provides an important clue, so we're ready to take a guess at the role this test technique plays. Being engineers, however, there's no room for guessing, so let's get the explanations down in black-and-white right now. Hydrostatic testing, as utilized on a pressure vessel, uses water as a seal inspection medium. It is Technically a Non-Destructive Test Technique Pressurized
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Ensuring a topnotch weld inspection program Ensuring that welders follow specific procedures is a crucial step in the overall welding quality system. There are a number of reasons to inspect a weld, the most fundamental of which is to determine whether its quality is good enough for its intended application. To evaluate the quality of a weld, it is necessary to
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While using a torch to preheat your welds may seem simple enough to suit your job, is it doing the job correctly? Preparing an electrical resistance preheat on a large piece of machinery. Image courtesy of KASI Technologies Inc. Preheating is an important preparatory operation for certain welding jobs. As the name implies, it is the process of raising
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Preheating is the act of heating the base metal before starting to weld. It is considered very essential in high thickness materials, Cr-Mo Steels & HSLA High Speed Low Alloy steels, etc… Here we are going to answer the below topics What is Preheating ? Why is Preheat Essential ? What is difference between Preheat, interpass temperature and Post weld heat treatment? How
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Preheat in Welding: What Is It and When Should You Use It? Preheating in welding is used to help ensure weld quality and reduce the occurrence of cracking and other problems that can result in costly rework. Welding preheat is commonly used before welding steel or steel alloy pipes or plates that are 1 inch thick or more. Preheating is often required in shop and field welding for oil and
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In addition to producing high quality radiographs, theradiographer must also be skilled inradiographic interpretation .Interpretation of radiographs takes place in three basic steps: (1) detection, (2)interpretation , and (3)evaluation . All of these steps make use of the radiographer'svisual
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Radiographic Testing (RT)is anondestructive examination (NDE)technique that involves the use of either x-rays or gamma rays to view the internal structure of a component. In the petrochemical industry, RT is often used to inspect machinery, such aspressure vesselsand valves, to detect for flaws. RT is also used to inspect weld repairs. Compared to other NDE techniques,
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Chromium carbides form in stainless steels along either side of a weld. These carbides form where the metal is in the temperature range of approximately 1100 – 1500 F. Since the weld pool is well above this temperature and the base metal is below it, there is always some part of the welded part which was in that temperature range. The quantity of carbides which form depends on several factors,
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Construction Codes & Significance Postweld heat treatment on the weld of ASTM A335 P11 seamless pipes. The heat treatment is performed by a flexible ceramic pad heater. Seamless pipes made of low-alloy steel ASTM A335 Grade P11 can be used for power piping (ASME B31.1) or process piping (ASME B31.3) at elevated temperatures. After joining the two ASTM A335 P11 pipes together by a welding
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Basic Weld Inspection - Part 1 John Hoh Senior Staff Engineer National Board Category: Design/Fabrication Summary:This article was originally published in theFall 2009National BoardBULLETINas the first of atwo-part series. Please seeBasic Weld Inspection - Part 2for the conclusion of this article. Note: The
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A crucial step in many welding applications, preheating slows the rate of cooling in a finished weld, lowers the amount of hydrogen in it, and reduces the risk of cracking. Artificially introducing heat into the base metal — by means of an external heat source — adds a step to the welding process; however, it can save you time and money in the long term by reducing the potential for a failed
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At the end of construction, and following commissioning tasks such as water flushing, water should always be present in petroleum processing equipment. Whenever this water may subsequently lead to an operational problem, or if equipment may be damaged, it is necessary to perform a drying-out operation. There are several different reasons for drying-out depending upon the type of equipment and
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We are happy to provide our services for all types of projects including oil and gas EPC projects all over the world for the followings All types of inspections Report making Procedure writing and review online coaching of cources. fitup and weld visual inspections. Report making and reviewing for all activities PWHT witness and checking Hydro-testing checking and report making Final
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Many characteristics of a weld can be evaluated during welding inspection - some relating to weld size, and others relating to the presence of weld discontinuities. The size of a weld can be extremely important, as it often relates directly to the weld's strength and performance. For instance, undersized welds may not withstand stresses applied during service. Depending on their size and/or
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Once you have determined that the welding application requires preheating, consider the best method to use. Induction heating is one preheat option that provides consistent heat throughout the weldment. It offers fast time-to-temperature and is considered a very safe option for preheating. Photo courtesy of Miller Electric Mfg. Co. Preheating with an open flame from a torch is