These figure 100 C-type constant springs were manufactured from A36 carbon steel for an oil refinery in Canada. Each constant was designed for 7″ of travel with a load of 35,144 lb. They measure 21.5″ W x 42″ L x 80″ H, and were specially designed to match a competitor’s dimensions in order to fit in the required application.
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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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An assortment of standard variable spring supports were manufactured ranging in size from 8-5/8″ to 12-3/4″ dia. with installed heights ranging from 9-7/16″ to 18-1/8″. The F-Type pipe hanger assembly is used to support the pipe from below and are typically mounted to concrete pads via anchor bolts or welded to structural steel. The various springs shown are designed for operating conditions ranging from loads of 1750 lb. with .02″ travel to 21,280 lb. loads with .13″ travel. As with all of our variable supports, these were quality checked with a 100% spring coil deflection test and a load cell calibration to set the assembly at the prescribed installed load.
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Ever wonder what makes a constant spring support different from a variable spring support? How does each one function? How do they support loads and allow for movement in a pipeline? Check out our new spring support article that provides all the answers to these questions and more.
F-Type Variable Springs with Slide Plates
Upthrust 200-U Type Constants for an Oil Refinery
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This big ton spring support measures 40″ length x 36″ width x 43″ height. It is composed of a carbon steel frame, neoprene coated spring steel coils, and has a hot-dipped galvanize finish. It also includes a guided load table to ensure stability when supporting the maximum load of 93,000 lb. Standard load and travel tests were performed prior to shipping.
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This 200 E-Type horizontal constant spring support is fabricated from carbon steel with a
hot-dipped galvanize finish. It is designed for a 54,020 lb. load with a total travel of 15.5″. The 3-bolt pipe clamp is designed for a 26″ diameter pipe and is coated with a red oxide primer. Each pipe hanger assembly went through standard load and travel testing prior to shipping. PT&P will design and fabricate any size constant spring support in addition to the sizes listed in our catalog.
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PT&P received a call to inspect spring supports in operation at a salt water cooler tower. It was quickly determined that replacement supports would be needed due to the heavy corrosion of the original supports not fabricated by PT&P.
Neoprene Coated Fig. 200 U-Type Upthrust Constant Spring Supports
A total of 40 constant and variable spring supports were fabricated as replacements. Each support was sealed with a neoprene coating over a hot-dip galvanized finish instead of stainless steel. This type of finish will ensure a much longer life-span. The spring supports ranged in loads from 800 lb. to 15,000 lb. with various travel ranges.
Neoprene Coated Fig. 100 U-Type Upthrust Constant Spring Supports
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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!
The variable spring and clamp assemblies are fabricated using a combination of carbon steel for the housing and internal components, spring steel for the spring coils, and Cro-Moly (A-387 GR. 22) for the high temperature 3-bolt clamps. This pipe hanger assembly is an example of PT&P’s standard variable spring design wherein multiple coils are arranged in series to produce adequate load carrying capacity and coil deflection to compensate for the anticipated pipe movement. These particular assemblies are capable of an overall load range of 9,320 lb. to 15,970 lb. with a total travel range of 5″. All pipe hanger assemblies underwent standard load and travel testing, 100% deflection testing, and load cell calibration before shipping to a power generation facility.
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This custom designed carbon steel constant measures 19 5/8″ wide, by 59 1/2″ tall, by 52 1/8″ long. It is designed for a 500 lb. load with a total travel of 17 1/2″. The support frame was increased in height to meet a large take-off of 59 1/2″. The constant spring will be used to support piping in an oil refinery.
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