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.
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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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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200-U Type Constant-Custom Design
– Designed for 21,269 lb. load
– 26-1/4″ W x 80″ L x 28-1/2″ H
– 10″ upward travel
– 12″ total travel
200-U Type Constant
– Designed for 18,273 lb. load
– 26-3/8″ W x 66″ L x 23-1/4″ H
– 0.43″ downward & 1.22″ upward travel
– 3″ total travel
100-G Type Constant
– Load range: 15,226 lb. to 17,210 lb
– 13″ W x 87″ L x 59″ H
– 2.8″ downward travel
– 4″ total travel
200-U Type Constant-Custom Design
– Load Range: 14,060 lb. to 18,334 lb.
– 27″ W x 84″ L x 24-5/8″ H
– Actual Travel Range: 10″ to 11″ Upward
– Total Travel Range: 12-1/2″ to 13-1/2″
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This Type G variable spring was manufactured for a Petrochemical Plant in Mexico. The Type G assembly is formed by welding two standard spring assemblies to the ends of a pair of channels. This type of assembly can accommodate unusually heavy loads, and is especially convenient for avoiding interference in spaces where headroom is limited.
Each spring assembly is loaded per the client’s specification at Piping Technology and Products manufacturing facilities. A travel stop is inserted and strapped in place to maintain the load for the assembly installation. In addition to banding the travel stops, the variables for this project required chained travel stops. The base style (F-Type) variables on this project were also required to have internal guides.
At Piping Technology and Products, Inc. we use PTP-1, PTP-2, PTP-4, PTP-6 and PTP-8 to designate the five standard coil arrangements to increase the working range of travel of variable supports.
Several types of variable supports were made for this particular project. They included Type A, Type B and Type F.
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These constants were fabricated from carbon steel hardware and structure. The vertical constants are used to support pipes and other equipment. They range from 4 to 6 feet and weigh between 690 lbs to 2,850 lbs. The constants have a total travel capacity of 7 to 8 . Standard load testing was completed to ensure quality and performance.
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These Figure 200 U-Type horizontal upthrust constants are designed to support piping from below. They are fabricated from carbon steel. These constants were also hot dipped galvanized and then specially painted. In addition, they are able to handle loads of up to 13,600 lbs. Each constant has a capacity of 4 total travel. They range from 55 to 62 long. Load testing and external inspections were completed to ensure the quality of these constants.
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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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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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Constant support hangers are used to support pipes subjected to vertical movement. The (Fig. PTP 200) constants are designed to support loads from 4,000 lbs to 57,000 lbs. Each weighs approximately 1,500 lbs to 2500 lbs and has a travel of up to 4″ with an adjustable travel stop. Their sizes range from 15 to 100.
The advantage of an adjustable travel stop is that the constant is able to “lock in” at any position within the range of travel for a given constant. This alleviates the need for a total “shut down” of the piping system for temporary conditions such as hydrotesting, repair, or replacement.
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These constant hanger assemblies are used to support piping systems subjected to vertical movement. They are capable of supporting loads ranging from 3,000 lbs to 63,000 lbs with a travel range of 5″. They have dimension between 73″ long, 36″ tall, and 23″ wide to 80″ long, 27″ tall, and 12 3/4 ” wide. Standard testing was performed for quality assurance.
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Constant hangers provide constant support for pipes subject to vertical movement due to thermal expansion. These Type E Constant Hangers are made from carbon steel ranging from 5 to 7 in length. Their applicable loads range from 17,300 lbs to 30,000 lbs. The total travel ranges from 2 to 9 . Standard constant load testing was performed for quality assurance per customers request.
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These PTP-200 type C constants measure 23″ x 64″. are designed for an operating capacity of 14,400 lbs and a travel range of 4″. The constants are made of A36 carbon steel and weigh 1,770 lbs each. They have been modified to accommodate a specialized spring coil and have a modified casing. Standard load and travel testing were performed prior to shipping to ensure quality.
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All of the custom designed variables consist of a single flange with two spring supports in order to meet the customer’s height restrictions. These PTP1-140 Type F variable springs are fabricated from A36 carbon steel with an overall weight of 16,900 lbs. They are designed for upward movement of 0.079″ with a hot load of 4,490 lbs., and a cold load of 4,620 lbs.
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This (PTP-13) size horizontal E-type constant is for an energy plant in Iowa. It measures 14″ 9″ 24″ with a total travel range of 5″ and an operating load of 388 lbs. It is fabricated out of A36 carbon steel, and weighs 95 lbs. Standard load and travel testing were performed on the constant prior to shipping to ensure quality.
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Piping Technology & Products, Inc. custom designed and manufactured Type 200-C constant springboxes for an energy plant in Louisiana.
The constant measures 23 x 40 designed for an operating load capacity of 8,300 lbs. and a total travel range of 8. The constant is fabricated of A36 carbon steel. To ensure quality,
standard load and travel tests were performed prior to shipping.
Do you see a need for constant spring supports in your piping system? Get pricing today!
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May 8th: U.S. Bellows - Expansion Joints In-depth Webinar 10:00 am OR 2:00 pm
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Piping Design and Analysis Influence on Pipe Support Selection and Design
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