This pressure vessel is manufactured from carbon steel SA516-70. Its diameter is 48 by 96 tangent to tangent and weighs 2,140 lbs. The pressure vessel is used as a process feed tank and was painted for rust resistance. In addition, the vessel was designed for pressures at 15 PSIG and temperatures at 86F. Hydro-tests were conducted at 20 PSIG and x-ray tests were completed to ensure quality performance.
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These PTP 100-B type constants were fabricated from A36 carbon steel. They are vertical constants designed to suspend from a beam to support pipes. These constants are capable of handling loads of up to 31,000 lbs. and have a total travel capacity of 3. Each measured 25 long, 13 wide, and 71 tall and weighed 1,850 lbs. Standard load and travel testing were completed to ensure the quality and performance of these constants.
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The horizontal upthrust constants (Fig. PTP200-U) were fabricated from carbon steel and chrome-moly for a Heat Recovery Steam Generator. The constants range in sizes PTP-200 size 3 to 65 and weigh from 24 lbs to 1,300 lbs. They support loads of 100 lbs to 8,100 lbs. The constants support pipes and equipment subjected to vertical movement due to thermal expansion at locations where transfer of stress to other supports or equipment can be critical. Horizontal upthrust constants are utilized in areas where horizontal travel is unacceptable. Standard testing was completed for performance and quality assurance.
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Piping Technology & Products, Inc. Performed Field Services for a Power Generating Plant in Texas
PT&P was contracted to assist in the determination of pipe support maintenance at a power plant in Texas. The constant effort support springs with loads of excess of 9,500 lbs and the variable spring supports with loads of 450 lbs were marked for needing attention.
PT&P’s objectives were to:
* Evaluate the pipe supports
* Determine state of performance
* Provide a plan of action
* Train personnel on-site to perform adjustments and replacement of supports or support components
* Provide final inspection of modified supports
The pipe supports needing attention could not be set to the required installation position. A plan was initiated to recondition some of the support components such as turnbuckles and rods. This would allow a greater range of field adjustment to the pipe supports. During a planned shut-down, PT&P Field Service Units returned to the site to modify the existing supports. The initial phase of the modifications included bracing the piping in order to isolate and lock the supports in position. Then, they were disconnected from the system and modifications to the assemblies were completed. Afterwards, the supports were reinstalled and any necessary adjustments were completed. A total of eight pipe supports were modified or adjusted.
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The upthrust constants (PTP Fig. 200-U) were fabricated from A36 carbon steel. Weighing at 4,150 lbs each, they measure 94” long, 27” wide, and 43” tall. They support loads from 90,700 lbs to 93,000 lbs with 4” of vertical travel. In addition, they are custom designed with extra supporting points for heavier loads. They are used to support the piping system from beneath the pipeline. Upthrust constants only allow for vertical travel and are used where horizontal travel is unacceptable. Standard load and travel testing was completed to assure quality and performance.
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Fifty Pre-Insulated Cryogenic Supports with PTFE, 25% Glass Filled, Slide Plates were manufactured for a 36” stainless steel piping system. The steel portion of the Cryogenic Supports is fabricated from ASTMA 240 Grade 304L stainless steel. The insulation used for the Slide Plate is Micarta, capable of supporting temperatures as low as -300°F. Each Pre-Insulated Cryogenic Support is 72” in length and weighs 2,000 lbs. It is designed to support the pipeline and accommodate 45” of axial travel at each support. They are used as Cryogenic Pipe Supports for a piping system that crosses a 1,000 foot suspension bridge.
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The hydraulic snubber extension rod ends(seen above) were manufactured from carbon steel. Ranging in sizes 1 , 4, 5, and 6, the weight of each increase with size, therefore; the weight of each unit varies. Extension rod ends are used in conjunction with hydraulic snubbers to extend the overall length of an existing snubber. They are applied to piping systems when unrestrained thermal movement must be allowed but must also be restrained during impulsive or cyclic disturbance. The turn around time for these units was 3 weeks.
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Three wedge action mechanical joint restraints made of ductile iron materials were utilized to assist in the construction of a suspension bridge. Also, these mechanical joints provide for vertical and axial restraint for the bridge. Each weighs approximately 300 lb. and measures 24” long by 16” wide, and 12” tall for a 6”, 10”, and 12” ductile iron pipe. They are capable of supporting 50,000 lb. In addition, they are designed for seismic conditions with the ability for 7” of axial travel.
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These cold shoes are made of polyurethane for cryogenic pipe lines at a liquid nitrogen gas plant. They measure between 8” to 16” in diameter, 30” long with 4” of insulation. These cold shoes provide insulation in the support area where the regular pipe insulation (foam glass) is not sufficient to support the load.
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These Figure PTP100-A size 40 and 51 constant supports, made of A36 carbon steel, are used to support pipeline systems. Each is 24″ long, 10 1/2″ wide, and 51 1/2″ high. These constants are capable of supporting loads ranging from 1,165 lb. to 2,260 lb. with a travel range of 13″ to 14 1/2″. PT&P specifically designed and fabricated each constant for specific dimensions provided by the customer. Standard load and travel testing was completed for quality assurance.
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