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Variable Spring Supports for an Off-Shore Oil and Gas Refinery

January 5th, 2010 No comments
C-Type Variable Spring Support Assemblies

C-Type Variable Spring Support Assemblies

The C-Type variable spring assemblies range in overall length from 3′-2½” to 3′-5/8″, and the F-Type measures 1′-1½. The C-Type variables are designed with an operating load of 1653 lb. and a spring rate of 680 lb/in. The F-Type variable is designed with an operating load of 1511 lb. and a spring rate of 340 lb/in.

F-Type Variable Spring Support

F-Type Variable Spring Support

The variable supports will be utilized in a highly corrosive environment; therefore, Grade 316 stainless steel was used with a unique 3-coat paint system applied to the can housing.

C-Type Variable Spring Assembly

C-Type Variable Spring Assembly

Want to learn more about variable springs? Watch a past variable spring webinar now!

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Big Ton Spring Supports with Low Friction Rollers

December 29th, 2009 No comments
Big Ton Spring Supports with Low Friction Rollers

Big Ton Spring Supports with Low Friction Rollers

PT&P fabricated several big ton spring assemblies consisting of two different models for a refinery expansion project in India. The larger model has an operating load of 25,590 lb. and a design travel of .420″ up.

Big Ton Spring Supports with Low Friction Rollers

Low Friction Rollers

The smaller model has an operating load of 12,100 lb. and a design travel of .443″ up. The big tons will be utilized to support substantial vertical loads while simultaneously providing a large platform to accommodate axial movement of the piping system across the load flange. Low friction rollers are installed to reduce the sliding friction between the load flange and the bottom section of a pipe shoe.

Do you require big ton springs in your plant or refinery? Let us price them for you today!
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5′ 7-1/2″ Tall F-Type Variable Spring Support Assemblies for an Oil Refinery in California

December 22nd, 2009 No comments
5′ 7-1/2″ Tall F-Type Variable Spring Support Assemblies

5′ 7-1/2″ Tall F-Type Variable Spring Support Assemblies

PT&P designed and fabricated F-type variables for an oil refinery in California. The variable springs are designed for an operating load of 49,771 lb. and an installed load of 43,000 lb. Two coils are used in tandem to achieve a vertical movement of 1-5/8″ downward. The variables are fabricated from hot-dipped galvanized carbon steel and are customized with an extended load column to reach an installed height of 67-1/2″. The variables for this project are the largest standard double springs offered; however, PT&P can customize to any load specification. Standard load testing was performed prior to shipment.

Want to learn more about variable springs? Instantly view a past variables webinar!
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Constant Spring Assemblies Custom Designed for Replacement of Failed Supports

December 15th, 2009 No comments
Constant Spring Assemblies Custom Designed for Replacement of Failed Supports

Constant Spring Assemblies Custom Designed for Replacement of Failed Supports

Constant Spring Assemblies Custom Designed for Replacement of Failed Supports

Failed Constants

This initial order included PT&P’s field services division testing and recalibrating four constant spring supports not manufactured by PT&P. A preliminary inspection of the original constants revealed deformations in the spring coil housing. This is indicative of defective coils; therefore, before any load tests were conducted, inspection windows were cut into the spring coil cover to confirm the initial hypothesis (Figure 2). Inspection of the coils revealed complete deterioration with broken and missing sections of the spring. Subsequent inspections of the remaining three assemblies illustrated similar failures. The original constants were then disassembled (Figure 3) to determine the feasibility of replacing only the coils while utilizing the original frame/cam components.

Constant Spring Assemblies Custom Designed for Replacement of Failed Supports

Failed Constants

The original spring coils were different in spring rate, length, and diameter than any standard PT&P coils; therefore, multiple coils were required to duplicate the overall function of the existing coils. Using multiple coils also required modifications to the existing frames. In an effort to expedite the overall delivery schedule, entirely new constant springs were manufactured in one week (Figure 1). The four new constants measure 53″ long, 13″ wide and 86″ tall. They have a 18-3/4″ diameter spring coil with a coil housing of 20-1/2″ diameter. The new constant assemblies are designed for an operating load of 13,332 lb., travel of 13″ upward and 2″ downward for a combined total travel of 15″. A load test throughout the total travel range was performed on each constant.

Want to learn more about constant springs? Watch a recording of a past constant webinar today!
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F-Type Variable Springs with Fully Adjustable Travel Stops

August 18th, 2009 No comments

F-Type Variable Springs with Fully Adjustable Travel Stops

F-Type Variable Springs with Fully Adjustable Travel Stops

 

Piping Technology & Products, Inc. manufactured a variety of F-type variable springs with loads ranging from 526 lb. to 33723 lb. These variable springs are fabricated from a combination of carbon steel and A193-B7 CroMoly steel with A304 stainless steel slide plates. The variable springs are modified to include fully adjustable travel stops. The first purpose of the adjustable travel stops is to aid by distributing the load evenly during the installation process. The second purpose is to allow spring adjustment to any load within the operating range.

Do you see a need for variable springs in your project? Get pricing today!
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U-Type Constants with Rollers to Reduce Friction

July 29th, 2009 No comments
U-Type Constants with Rollers to Reduce Friction

U-Type Constants with Rollers to Reduce Friction

U-Type Constants with Rollers to Reduce Friction

Rollers

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.

Want to learn more about constant springs? Instantly view an archived constant webinar!
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C-Type Constant with Special Lugs for a Power Plant

April 8th, 2009 No comments

 

 

C-Type Constant with Special Lugs

C-Type Constant with Special Lugs

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.

Do you require constants for an upcoming project? Get pricing today!
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200 U-Type Constant Spring Supports with Slide Plates to Reduce Friction

March 25th, 2009 No comments
200 U-Type Constant Spring Supports with Slide Plates

200 U-Type Constant Spring Supports with Slide Plates to Reduce Friction

200 U-Type Constant Spring Supports with Slide Plates

Slide Plate on Constant

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.

Do you require similar spring supports for your job? Get pricing today!

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120 3/8″ Long Custom Variable Spring Supports with Four Individual Coils

March 11th, 2009 No comments

120 3/8" Long Custom Variable Spring Supports with Four Individual Coils

120 3/8" Long Custom Variable Spring Supports with Four Individual Coils

These variable springs are custom designed from carbon steel material. The springs are fabricated with extra long housings to allow for a pre-compression lower than the standard. This ensured that the starting (cold) load of 26,745 lb. could be achieved. The springs are designed for a movement of 5.55″ downward, which would produce an operating load for each assembly of 38,305 lb. These springs are to be utilized in pairs together with a 22″ riser clamp to produce a 407″ total pipe hanger assembly length and an overall combined operating load of 76,610 lb.

Want to learn more about variable springs? Watch a past variable springs webinar today!
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B-Type Constants for an Oil Refinery

December 29th, 2008 No comments
B-Type Constants

B-Type Constants

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.

Want to learn more about constants? View a past constant webinar recording!
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