The ladders and platforms were designed to be installed on a 90′ tall pressure vessel. The ladders were fabricated from carbon steel and ranged in size from 5′ to 38′ in length. The vessel platforms were also fabricated from carbon steel and measure up to 16′-6″ in diameter.
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PT&P’s Sweco Fab division designed and manufactured a pig launcher and receiver with a flag type indicator and a flanged HI-T Pig Alert pig signaler. They are fabricated from carbon steel with a three coat paint system. The pig launcher has an 8” diameter minor barrel, a 10” diameter major barrel, and is 110” in overall length. The pig receiver has a 10” major barrel, a GD II Closure and is 170” in overall length. They are designed for 430 psig at 100°F and were hydro-tested at 645 psig , held for four hours. Both pig launcher and receiver went through a 100% radiography test prior to shipment.
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The pig launchers and receivers were designed for a coal-bed methane gas production facility in Colorado. They are equipped with an integral safety locking system which works on the principle of mechanical key interlocking (transfer of keys). This system avoids serious injuries from human error and insures safety of personnel.
One starter key per launcher/receiver is kept in a box located in the control room. Each lock is executed with two keys. When the first valve is opened with this starter key, it releases the second key. This key is transferred to next valve which releases second key from that valve and so on and so forth. This process guides the operator through the specified sequence for opening and closing valves with unique a key for each step.
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20 vessel supports ranging in length from 30″ to 84″ were manufactured for an oil refinery in Texas. The structural supports will be attached to existing vessels to assist in supporting the nearby pipes and piping system. The supports were fabricated from carbon steel and coated with a hot-dipped galvanize finish to prevent corrosion.
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This high pressure knock-out drum has a 2.5″ thick shell fabricated from ASTM SA516 Grade 70, and a SA105 and SA350 carbon steel flange. The drum has a 48″ diameter, a total length of 15’8″ and weighs over 23,000 lb. It underwent a hydro-test and design test per ASME section VIII-1 “U” stamp vessel prior to shipment.
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Sweco Fab, Inc., a division of PT&P, fabricated a variety of six spectacle blinds that will be used for selective line isolation. The spectacle blinds are fabricated from A516-70 carbon steel with sizes ranging from 4″ to 14″ diameter and per ASME B16.48 code. The function of a spectacle blind is to allow a line to be in either full shut-off mode or full flow mode, depending on which side is being utilized. Spectacle blinds are a lower cost alternative to double block and bleed valves where OSHA requires positive isolation of piping segments for safety reasons.
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Both pig launcher and receiver are fabricated from various low temperature carbon steels. They also include a GD Closure built to ASME Section VIII specifications. The operating temperature range is from -35°C to 65°C. The receiver is 33′ long and the launcher is 20′ long. Both have a 24″ diameter major barrel feeding into a 16″ diameter minor barrel. A rugged three coat paint system was applied per customer specifications. Various tests were performed, from hydrostatic and dye-penetrant to full radiography and ultrasound.
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This damper was fabricated from a combination of 304 stainless steel and Inconel®. It is designed as a shut-off damper to control the flow of flue gas in an ammonia plant. The damper will be connected to a motor-driven control system by the linkage shown in the picture. The overall dimensions are 10′ x 6′ with a weight of 2,200 lb. It was painted with standard inorganic zinc primer and top coat per customer specifications. The damper went through visual inspection, dye-penetrant, and functional testing before being shipped to the customer. Refractory lining, utilized to withstand the high temperatures, will be added during installation.
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This process vessel has an inside diameter of 48″ and measures 60″ tangent to tangent. The overall height of this vessel is 81″, and measures 120″ including the legs. It is fabricated from 1/2″ 516-70 carbon steel material. This vessel is designed and fabricated according to ASME Section VIII Div 1 codes. It has a capacity of 500 gallons with an internal design pressure of 50 PSIG. The maximum acceptable working pressure is 178 PSIG. This process vessel was heat treated for stress corrosion resistance in the field and 100% x-ray tested and hydro-tested at 231 PSIG prior to being shipped to the customer. This vessel was designed for the customer as a replacement vessel for one in the field that had already provided 20 years of service in a mildly corrosive environment.
Sweco Fab, Inc. worked with the customer to provide a vessel that was even more efficient than the previous one by including 1/8″ thicker walls, an additional 12″ between tangents, heat treatment, an internal drip plate, and an OSHA compliant ladder and platform.
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