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  1. TECHKNOWSERV specializes in the nondestructive testing of pipelines with long-range ultrasound (LRUT).  Under ideal conditions,  guided wave ultrasonic testing (GWUT) technology may be used to inspect up to 1000 feet (300 meters) of pipe from a single sensor position or up to 4000 feet (1.2 km) in one day. The actual inspection range depends on the type of pipe coating, degree of corrosion present in the pipeline, number of elbows, and whether or not the pipe is aboveground or underground. Guided wave testing (GWT) technology may be applied to thin- and thick-walled pipe, with diameters rangin...

  2. IntroductionFiberglass tanks are complex structures made from multiple layers of different materials to achieve a balance between strength, weight, and corrosion protection.   Starting from the inside – out, a typical filament wound fiber reinforced plastic (FRP) tank consists of an inner surface, interior layer, structural layer, and outside layer.   The inner surface is commonly 10-20 mils thick resin rich layer.  The interior layer is in the 100 mil range and contains 20 to 30 % chopped glass for strength.  As its name implies, the structural layer carries most of the product related stress...

  3. IntroductionIt is not uncommon for a nondestructive testing ultrasonic technician to inspect structural welds according to the American Welding Society D1.1: Structural Welding Code – Steel (AWSD1.1), at least a few times in his or her career, and some inspectors use it daily.  Completing a professional AWSD1.1 inspection, however, without the proper code specific training can be daunting.  This article is designed to give the reader an introduction to the 2008 edition of Ultrasonic inspection per AWSD1.1 inspection procedure. The reader needs to be aware that some important (but routine) step...

  4. TANKSERVTM: Acoustic Emission Testing of Aboveground Storage Tanks The floor of an Aboveground Storage Tank (AST) remains the most difficult part of the vessel to inspect for corrosion damage. Generally, this section of the tank is inaccessible from the outside for conventional Non Destructive Testing (NDT) and the costs of opening the tank and preparing it for an internal inspection including cleaning, purging and loss of production availability, creates a significant financial burden for the tank owner/operator.  An advanced NDT method with the capability of assessing the condition of the ta...

  5. TECHKNOWSERV CORP. (TKS) is a leading supplier of fiberglass tank acoustic emission testing on new and in-service fiberglass reinforced plastic tanks.  Acoustic emission testing (AET) is used to inspect newly fabricated tanks during hydrostatic testing and in-service testing typically in 5-year intervals.  The object of acoustic emission testing of FRP tank are to find manufacturing and in-service defects that include delaminations, fiber breaks, matrix cracking, and fiber pullout.  Acoustic emission testing in accordance with ASTM E1067-07: Standard Practice for Acoustic Emission of Fiberglas...

  6. There are many classes of DOT steel cylinders used for medical, industrial, power generation, and gas storage, such as nitrogen, oxygen, helium, hydrogen, etc.   It is common to mount these cylinders on a trailer so that the desired gas may be delivered to the customer’s site and refilled at bulk gas storage facilities as required.  Since these tube trailers transport certain gases, compliance with U.S. DOT Pipeline and Hazardous Material Safety regulations are required.   Part of this requirement includes a minimum 5-year re-certification process that assures the tubes or cylinders are fit fo...

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