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A “U-Type” and 6 “C-Type” constant spring supports were designed to support piping in a corrosive environment located off-shore in Malaysia. The U-Type measures 21″ x 25″ x 57″ and C-Types range in size from 11-5/8″ x 17″ x 4″ to 18-3/4″ x 32″ x 80″.

The constants are fabricated from A36 carbon steel with a fluorocarbon coating on the pins. The frame, housing, and all components were coated with a 3-coat paint system to resist corrosion. Standard load and travel tests were performed prior to shipping the constants on a rush basis.

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PT&P designed a constant load support system for a fluid tank with a load of 105,000 lb. over an area of 5′ W x 20′ L. To prevent twisting of the fluid container, the support system is designed to allow for “level” vertical movement. This was achieved by using a special system composed of three U-Type constant units. Each unit employs two springs working in parallel with a common large base plate and a load flange to support the entire 5′ width of the container.

The constants will support loads of 39,000 lb., 36,000 lb., and 30,000 lb., with a total travel of 4″ in the “upwards” direction. The spring coils were coated in neoprene, and all the other major components were hot dip galvanized to inhibit corrosion. These constants were constructed primarily from carbon steel with the use of stainless steel and PTFE, 25% glass filled slide plates.

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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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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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Piping Technology & Products, Inc. recently custom designed and fabricated PTP Fig. 200 Constant Hangers for a coker unit in St. Croix.

These supports, with operating loads ranging from 4,000 lb. to 58,000 lb., will be used to support flue gas ducts at the oil refinery. The overall lengths of the Horizontal Constants are 5′ to 7′, and the heights of the Vertical Constants ranged from 4′ to 6′. The combined weight of the constants totaled over 24,000 lb. Color-coded rivets for hot and cold loads and universal locking devices are also installed per customer’s request.

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Piping Technology & Products, Inc. custom designed and manufactured eight Type F vertical constant supports for a refinery in Ohio.  The constants are capable of supporting 2,000 to 3,500 lbs. and have a maximum travel of 5. They are constructed of carbon steel and each weighs 270 lbs. Standard load and adjustment testing was performed to ensure quality prior to shipping.

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These constants are designed for a vertical travel range of 8.5 and an operating load capacity of 70,000 lbs. They are fabricated out of A36 carbon steel with dimensions of 45×80. Prior to shipping, standard load and travel tests were performed to ensure product quality.

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Piping Technology & Products, Inc. custom designed and fabricated PTP-100 type U and PTP-100 type A constants.  The PTP-100 type U constants are designed for operating loads of up to 17,000 lbs. and a travel range of 3.5″. They are fabricated from A36 carbon steel with dimensions of 32″x48″x13″. The PTP-100 type A constants are fabricated from the same material and measure 39″x42″x14″. The type A constants are designed to support loads up to 25,000 lbs. and enable downward travel of up to 4″. Standard load testing was performed to ensure product quality before shipping.

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Piping Technology & Products, Inc. custom designed and fabricated 200-C type constants to suit constricted areas of a chemical processing plant in Texas.

Short distances between the pipe and the supporting beam necessitated a custom design. Two designs were needed one was for a 230 lb. load with 11″down travel, while the other was for a 260 lb. load with 13-1/2″ down travel. The PT&P standard design for these constants has Take-Out values of 19-9/16″ and 21-9/16″, respectively. However, the available space permitted no more than 9-1/2″.

Compare the final design, shown on the left to the standard design, shown on the right. Note that the lower part of the frame has been cut away, permitting the pipe to move nearer to the constants’ supporting lugs.

PT&P’s system of stock pipe and spring supports, allowed engineers and workers to fabricate these constants within a short amount of time.

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