These 200-C type constants are fabricated from A-36 carbon steel and are designed for a load ranging between 17,800 lb. and 25,600 lb. The constants have a downward travel ranging between 12 1/2″ and 16″. This support maintains a constant load throughout the designed travel. The diameter of the spring coil housing is 21″. The design includes a universal locking device capable of locking the hanger rod at any desired position. It also includes lifting lugs that aid in installing the constant in the field. Standard load and travel testing was performed before shipping to a steam plant.
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8 Foot Long Big Ton Variable Spring AssemblySlideplates on Big Ton Spring Assembly
This big ton spring assembly is designed for a local area refinery, and is fabricated from carbon steel components with a painted finish. The top of the load flange has three PTFE, 25% glass filled slide plates. The base is 96″ x 18″ and the installed height is 24″. This big ton spring will be utilized to support heavy (in excess of 76,000 lb.) loads where a standard variable spring would be undersized. The big ton spring design includes an array of parallel coils within one frame to produce large load carrying capacity while maintaining the same spring rate. The assembly is designed to withstand an operating load of 76,800 lb. and has a downward travel of 0.894″.
Prior to fabrication, each of the coils were individually tested to insure correct spring rate and load capacity. After fabrication, the entire assembly was tested throughout the entire load and travel range.
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The base measures 63 inches square while the top load flange measures 55 inches square. One of the springs has an overall height of 22-7/16″ and the other an overall height of 28-5/8″. Both big ton springs are custom designed and fabricated from carbon steel with a hot-dipped galvanized finish. The top of the load flange is covered by a stainless steel slide plate. These big ton springs will be used to support heavy (in excess of 100,000 lb.) loads where a standard variable spring would be undersized.
One of the big ton springs is designed with a operating load of 126,000 lb. and the other with an operating load of 225,000 lb. Prior to fabrication, all of the coils, within the frame, were individually tested to insure correct spring rate and load capacity. After the units are fabricated, the entire assembly is tested throughout the entire load/travel range.
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PT&P custom designed and fabricated these F-type variable springs with rollers to be used in a refinery in Kansas. The variables are fabricated from carbon steel with a stainless steel clamp-on shoe that attaches to the load column. These F-type variable spring assemblies measure 23″ in height and have an upward travel of 3″. The operating load is 1,000 lb. and the installed load is 1,300 lb. The function of this custom designed variable spring is to allow large axial movement along the axis of the pipe centerline. The load column is modified to accommodate the special clamp-on shoe. The customized wheels allow for movement of the entire spring assembly in conjuction with the pipe.
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These variable spring hangers were custom designed per customer specifications for a power plant in Turkey. The pipe hanger assembly measures 7′- 6″ long and the diameter of the can measures 12″. The variable spring hanger is capable of 55,137 lb. of hot load and 63,339 lb. of cold load. The assembly allows for 1″ upward travel.
In order to achieve the required spring rate, PT&P utilized a set of stacked coils (5 5/8″ O.D.) nested inside a larger coil. This produced an overall spring rate of 9,235 lb/in. The upper and lower attachments were minimized to fit within the space requirements provided.
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– U-Type constant spring supports for a power plant in Thailand
– Fabricated from A36 carbon steel
– Dimensions = 25″W x 28″H x 80″L
– Load = 24,000 lb.
– 3″ of total travel upward
– Standard load and travel testing was performed
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43" Angulating Constants for a Power Plant in Utah
The design of this constant requires that it be connected by pins from the top and from the bottom to allow it to angulate. The constant assemblies are fabricated from A36 carbon steel. The constants measure between 23″ and 43″ in length with a take-off between 29″ and 55″. The load range is 60 lb. to 2,605 lb. and each constant assembly underwent standard load and travel testing.
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These U-type upthrust constant supports are designed to handle 6″ of total travel and loads of 5,677 lb. and 4,956 lb. The load flange is modified to hold six ball transfer units for each support. The ball transfer units are used to decrease the coefficient of friction to 0.05 compared to using the standard PTFE, 25% glass filled, which is 0.15.
Ball Transfer Units
Gussets are added under the load flange to maintain a leveled surface and an equal load transfer to all ball transfer units. These custom designed constant supports are manufactured for steam power plant superheaters.
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Piping Technology & Products, Inc. Designed and Fabricated a Upthrust U-Type Constant for an Energy Plant in California
– Designed for a constant load of 7,733 lb.
– Travel ability is from 0 to 9 inches of total travel
– The constant’s shipping and installation setup is for downward travel
– The constant spring support has been custom designed to reduce its take-off from 36 7/8″ to 29 1/2″
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Big Ton Springs used in a Chemical Processing PlantStainless Steel Slideplates on Big Tons
The limiting constraint in designing and fabricating these big ton spring supports was to maintain an overall height less than 15-3/4″ and still allow the load table to travel downward during operation. Whereas a standard PT&P size 2-190 variable springs would have been sufficient to hold the load specified, the coil alone was taller than the space available at site. For this reason, a “big ton” design was implemented which utilized six smaller coils (2-130 size) working in parallel to produce the required load-carrying capability and spring rate.
All of the frame/housing components were made from carbon steel and supplied with an HDG finish. The travel stop rods were made of A-193 Gr. B7 material and were painted red. The slide plates sitting atop the load flange were made of polished A-304 stainless steel.
Both “big ton” assemblies are 30″ wide by 30″ deep by 15-3/4″ tall. Overall spring rate is 3,600 lb/in. and each weighed approximately 1,460 pounds. The installed (cold) load = 14,800 lbs. and the operating (hot) load = 16,075 lbs. Movement from cold to hot = 0.354″ down.
Tested in the load cell to insure proper operation throughout the entire working range of the coils, the “big tons” were then set to the cold (installed) load as specified.
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