112 custom variable springs designed for a furnace application for an oil refinery in Venezuela. The furnace cans are designed from carbon steel and painted with red oxide primer to prevent corrosion when exposed to high temperatures. The sizes of these figures PTP-6 and PTP-8 range in length from 25″- 39″, with a total travel of 0.1″- 1.821″ and loads varying from 430 – 681 lb. A load test to confirm the spring rate was conducted on each assembly prior to shipment.
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PT&P designed and manufactured 27 B-Type variable spring supports for an oil refinery in Louisiana. The spring cans, rods, welded beam attachments, turnbuckles and clevises are fabricated from carbon steel. The spring cans have a 12-3/4″ diameter and measure 290″ from the bottom of the steel to the connection of the pipe. They were designed for 2″ of vertical movement and operating loads between 24,375 and 27,500 lb.
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In eight weeks, PT&P provided a gasoline production plant in Dubai with two custom designed variable assemblies. Each assembly includes load columns, four variable spring cans, four channels, 12 plates, nine graphite slide plates and a custom designed frame. The frame allows the variable springs to work in unison to support large pipe trunnions. The top plates measure 45″ in width and 25″ in height. The variables are designed for an operating temperature of 750°F and an operating load of 3,150 lb. The assemblies are capable of 1/8″ upward movement and 1/6″ downward movement. A load test was conducted prior to shipment.
PT&P designed and fabricated 112 variable spring supports for a furnace application at an oil refinery in California. The spring cans are fabricated from carbon steel, vary from 36″ to 54″ in height and designed to operate at 400°F. The furnace cans are designed for operating loads ranging from 180 lb. to 1,400 lb. and movements from 1″ to 5″. The customer specified a custom paint system of two part iron oxide blue finish for the cans to comply with refinery conditions. Load tests were performed on the assemblies prior to shipment to determine the operating load and variability.
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These 100-B Type vertical constant spring supports were designed with double transverse lugs for a refinery in Mexico. The constants were fabricated from A-36 carbon steel and they range in size from 23-1/4″ to 26-5/8″ in height, 50″ to 78″ in length and 18-3/8″ to 18-3/4″ in width. They are designed for operating loads ranging from 8,000 – 27,000 lb. and upward movements ranging from 3″ to 7″. The double transverse lugs allow the entire constant to swivel with the rod. Standard load and travel tests were performed prior to shipment.
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PT&P designed and fabricated F-type and C-type variable spring supports for an acid plant in Canada. The variables range from 4″-8″ in diameter and can accommodate between .039″– 5.02″ in movement. They are designed for an operating temperature of 200°F and operating loads between 509 lb. and 13,489 lb. The variable springs are coated with a red oxide coating to protect against corrosion and underwent standard and load travel tests prior to shipment.
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PT&P custom designed “mini” big ton spring supports to support a large centrifugal fan at a chemical refinery in Texas. They are designed to support a total weight of 33,000 lb. within a maximum space envelope of 4″ wide x 16″ long x 8″ tall. As a result, these mini big-tons were fabricated using coils which could be placed in parallel within their respective frames. Four of the unites were comprised of four inner coils nested inside four outer coils to produce an operating load of 4,478 lb. and an overall spring rate of 2,740 lb./in. The smaller load capacity units were configured of four individual coils in parallel with an operating load of 3,735 lb. and a spring rate of 2,300 lb./in. The frame, load flange and all internal components were fabricated from carbon steel. The spring coils were fabricated from ASTM A-5160 spring steel. All supports were tested through their total working range to confirm load capacity and functionality.
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PTP-2 160 C-Type variable spring support assemblies were designed and fabricated for an oil sands mine in Canada. The variables are 8″-12″ diameter, 16″ to 32-1/2″ overall length, and designed for an operating load of 5590 lb. with an upwards travel of 0.787″. The variables were fabricated from carbon steel with a hot-dipped galvanized finish and standard load and travel testing was completed prior to shipment.
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This PTP-100 Type-G constant spring support is 96″ long by 40″ high and will support a 12,818 lb. load. It has an actual travel of 0.3″ and total travel of 1-1/2″. The G-type constant is comprised of two standard constant spring housing sub-assemblies joined together with an intermediate bridge assembly. The bridge assembly is customized to handle up to 26,000 lb. of hydro load. The G-type assembly allows for use in applications with limited space. Special identification tags were installed in addition to PT&P’s standard name plates per the customer’s request. Standard testing was performed and witnessed by an outside inspector prior to shipment.
These variable spring hanger and pipe clamp assemblies were custom designed for pipes ranging from 6″ to 20″ diameters at a co-generation plant in Canada. The spring can, threaded rods, weldless eyenuts, welded beam attachments and Fig. 80 pipe clamps were fabricated from hot-dipped galvanized carbon steel. The assemblies are capable of an overall load of 10,790 lb. with a total travel of 1/2″. A total of 21 spring hanger and clamp assemblies underwent standard load and travel testing.
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