Big Ton Springs used in a Chemical Processing Plant

Stainless Steel Slideplates on Big Tons

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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90,000 lb. Load Big Ton Springs for a Chemical Plant

Name Plate Indicates Hot/Cold Loads

Piping Technology and Products, Inc. manufactured four 13,500 lb. Big Tons Springs for a chemical plant in Texas. These PTP-500 Big Ton Springs have a load capacity of 60,000 to 90,000 lb. are fabricated from A-36 carbon steel. They are designed for 750°F and a downward travel range of 3/16″ to 1/4″. These 37″ x 31″ x 30″ Big Tons will be used to support certain critical equipment with thermal expansion at the chemical plant. To assure quality, load testing was performed on the big tons prior to shipping.

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Big Ton Springs Equipped with Special Rollers

Rollers Installed On top of the Load Flanges

Piping Technology & Products, Inc. specially designed and fabricated big ton springs equipped with special rollers to accommodate moving apparatus and support piping at a refinery in India.

The specially designed big tons were made to support loads ranging from 55,000 lbs. to 114,000 lbs with no more than 5/16″ upward movement. Its composition comprises of A-36 carbon steel, built to a maximum height of 23-5/8″.

The special rollers installed on the top of the load flange, keeps the aforementioned loads moving smoothly under all kinds of conditions. To further assure their quality, each of the big ton spring assemblies underwent load testing and afterward were hot dipped galvanized to prevent against corrosion.

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Big Ton Springs Equipped with Lifting Lugs

Piping Technology & Products, Inc. specially designed and fabricated big ton springs equipped with side lifting lugs to support piping of a 102-megawatt, refinery cogeneration power plant in California.

Under typical circumstances, this type of job application would utilize variable spring hangers, but because of the restricted space, the hangers’ size would be too small to support a hot load of 19,068 lbs and cold load of 17,212 lbs. In order to satisfy both the required loads and space, PT&P engineers designed and fabricated figure 500 big ton springs equipped with side lifting lugs. The lifting lugs were attached to allow the big ton to suspend as a variable spring would in the field.

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Big Ton Springs With Loads Up To 450,600 Newtons

Piping Technology & Products, Inc. specially designed and fabricated Big Ton Variable Springs for a chemical project in Canada. The supporting beams are 30″ in length with PTFE, 25% glass filled stainless steel slide plates. The Big Ton Springs were designed with six coil springs with external guides to prevent horizontal twisting and internal guides to withstand horizontal friction forces. These units were also designed for operating loads from 260,000 to 350,000 Newtons and hydro-test loads from 300,000 to 450,600 Newtons. A total of six units were painted with a special finish specified by the client.

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Specially Designed 120,000 lb Load Big-Ton Spring Supports

Pictured above are Big-Ton Spring Supports specially designed by Piping Technology & Products, Inc. These types of supports are used in supporting large and heavy units such as compressors, vessels and pumps in power and petrochemical plants. The ones below were used to support vessels in excess of 120,000 pounds. The Big-Ton Spring Support are designed to allow limited movement in confined areas. By doing this, it saves the customer from having to entirely redesign the piping system and saves thousands of dollars.

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