Check out this video of our field service manager instructing how to remove travel stops from a constant effort support. This procedure is a very critical and necessary step in the installation of constant spring supports.
More helpful instructional videos are available on our website!
PT&P fabricated 12 constant spring supports of various sizes with PTFE, 25% glass filled slide plates. The smallest constant is 38.25″ length x 13″ width x 28″ height, and the largest is 52″ length x 19″ width x 28″ height. The designed loads vary from 13,264 lb. to 15,962 lb. and the total travel range is 2″ to 3″.
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The constant spring hangers are manufactured from A36 carbon steel and have custom 4-bolt pipe clamps due to heavy loads. The dimensions are 40″ length x 18″ width x 85″ height and are designed for a 1,784 lb. load with 10″ of travel. The constants will be used to support radiant inlet manifolds and have a unique paint applied due to the highly corrosive condition. The entire pipe hanger assembly went through load and travel testing prior to shipping.
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This constant utilizes sealed cam follower roller bearings in place of slide plates that are generally used between the moving table and stationary frame. The rollers help to reduce the friction on the table, reduce residual loads which improve constant deviation, and help to restrict table movement in horizontal directions. These U-Type constants are fabricated from A36 carbon steel with dimensions of 28″H x 37″L x 17″W. The boxing, bolting patterns and loading table location are custom designed per customer specifications. The design also includes a graphite plate bonded to the top of the load flange to reduce the friction between the constant load flange and the saddle support above it. The supports are designed to carry 3015 lb. of piping load with an upward travel of 6″. The constants underwent standard load and travel testing before being shipped to an energy plant.
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This PT&P 100 C-Type constant spring support was designed in conjunction with special lugs to fit inside of a trolley. The lugs will provide for movement up and down, as well as extensive horizontal movement. This constant was fabricated entirely from A-36 carbon steel with a hot-dipped galvanize finish. The constant measures 16″ wide x 25″ long x 56″ high. It is designed to carry 16,164 lb. of piping load with a travel of 3 1/2″ downward. The lugs will fit within a trolley by a single pin connection. This configuration will prevent swinging by maintaining the constant in an upright position, which will ensure proper functionality and eliminate any load deviation.
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These custom designed constants will be utilized for a heavy load of 109,000 lb. They are designed for a downward travel of 1 1/2″. In order to support the heavy load and low take-off, the constants are designed with an inner and outer spring coil with the outer coil measuring 56″L with a 18 3/4″ O.D. These U-Type constants are fabricated from A36 carbon steel with a hot-dipped galvanize finish.
The dimensions of the constant are 31″H x 90″L x 32″W. The image above shows a PTFE, 25% glass filled slide plate on top to reduce the friction between the constant load flange and the structure above the support. The constant also includes slide plates between the table and the frame of the constant to reduce the friction on the table and improve constant deviation.
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These A-36 carbon steel constants have a hot dipped galvanize finish and designed for an oil refinery. They have a single lug suspension and can support a piping load of 5,031 lb. The dimensions are 36 1/2″H x 21″L x 11 5/8″W. This type of spring support is designed to support the pipeline from above using a carbon steel clamp.
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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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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 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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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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Within a two-week span, PT&P designed and fabricated eight Stainless Steel, grade-304, types B & E Constants for a marine plant. These constants have a travel of 1 1/2 – 5″ and are specified to carry 50 – 1540 lbs load. Stainless steel was requested due to the corrosive nature of the environment. PT&P also manufactured nine Carbon Steel types B & E Constants for this project.
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Piping Technology & Products custom designed and manufactured vertical F-type constants for a power plant in Connecticut.
The 100 type F is a vertical constant designed to support piping from below with minimum space usage. The dimensions of the constant are 26-5/8″ high, 10″ wide, and 17-9/16″ long with an operating load of 280 lbs.
This particular F constant, was unusual in that it was furnished with a vertical spring that attaches below the frame of the constant. In addition to a downward travel of 3″, the flange table shifts forward at 1-3/8″ to minimize axial movement.
A galvanized finish was applied to the constant to prevent corrosion. The constants can be bolted on or welded to the support or steel underneath.
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Piping Technology & Products, Inc. specially designed and fabricated four hundred 100-C, vertical constant load hangers for a plastics plant in Texas. The constants will be used to support a furnace standing three levels high.
In the plant, thirteen single beams confined to limited space will each hang thirty constants, therefore PT&P engineers were required to design the constants to weigh less than 150 pounds. The 136-pound constants with travels of 10 inches upward and a supporting load of 950 pounds, are 33 7/8″ in height and 8 7/8″ in width. They are also supplied with shop prime, painted finish to safeguard against the extremely hot temperatures of the furnace area. In order to insure quality and proper operations of the constants, a prototype was built and tested to MSS standards.
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Piping Technology & Products, Inc. designed, manufactured and delivered a total of 8 constants to a power plant in Mexico. The designs consisted of 4 Horizontal U-Types Upthrust (Figure 1) and 4 Vertical F-Types (Figure 2) that are to support 24-inch diameter pipes. Each consisted of different sizes. The constants are designed for loads of 2,839 lbs. to 8,963 lbs., for Total Travels ranging from 7 to 3 inches. Constants were painted CZ-11 per customer request.
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In January 2000, Piping Technology & Products, Inc., a manufacturer of high quality engineered products, designed and built two 33 1/2 inches travel and two 25 inches travel constant load spring hangers. These constant load spring hangers will be in service at a geothermal production well in Hawaii, where they will be used to support a pipe that carries hot water discharged from a geothermal production well to a separator.
The well will produce 2.8 Million gallons of water per hour at a discharge temperature of 680° F, and a pressure of 2800 psi. These custom designed constant load spring hangers provide extraordinarily large travel distance. The 33 1/2″ travel and the 25″ travel constant load spring hangers are designed to provide a constant 16,000 lbs. and 6,000 lbs support for a pipe moving a vertical distance of 33 1/2″ and 25″ respectively.
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The vertical constant is used when piping stress is critical and pipe is subject to vertical movement in excess of ½ inch due to thermal expansion, and also at locations here it is necessary to avid any transfer of stress from support or onto critical terminals or connecting equipment. These constants are manufactured by Piping Technology & Products, Inc.
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Sign-up for a Live Technical Webinar…
This Webinar will focus on the different types of variable spring supports and big ton variable spring supports. Learn about the special features available, in addition to the design of a variable support. View how the different coil configurations produce a unique response to an applied load and see how a spring assembly is loaded. Discover the basic steps in selecting a hanger design and the step-by-step process used to size a spring for your application. Learn about the different attachments, testing, and installation and maintenance procedures. View examples of failed supports provided by our Field Service Division and learn why they failed and how to prevent it. Gain knowledge of the valuable tips used when deciding to replace or re-calibrate a variable spring support, as well as adjustments, shutdown, and isolation procedures.
May 9th: Fabric Expansion Joints Webinar by U.S. Bellows, Inc. 10:00 am OR 2:00 pm
May 16th: Pipe Support Field Inspection, Installation and Maintenance Webinar 10:00 am OR 2:00 pm
May 23rd: Slide Plates & Pipe Rollers in the Fight Against Friction 10:00 am OR 2:00 pm
Piping Design and Analysis Influence on Pipe Support Selection and Design
Surveying a piping system? Need to change a current system?
This course is also great for…
• New Engineers, Management and Operations
• Field, Process, Maintenance and New Engineers
• Piping and Piping System Designers and/or Instructors
*This online course is approved for 8 hrs. P.E. Credits
