Constant Spring Supports with Stainless Steel & Graphite Slide Plates

February 22, 2022

U-Type Constant Spring Supports in Texas

Type: Constant Spring Supports
Size: 35-7/16″ Height & 75-3/4″ Length
Material: A36 Carbon Steel with HDG | 304 Stainless Steel
Design: 9″ Total Travel at 979°F | Operating Load 6,183 lb.
Testing: Hydro tested at 6,744 lb.

These 200 U-Type constant spring supports with slide plates were designed by PT&P for a plant in Texas. They are fabricated from A36 carbon steel with an HDG finish and are typically designed for vertical movement only. However, when there is lateral or axial movement in the piping system, slide plates can be used in conjunction with these constants. In this instance, graphite slide plates are bolted to the constant’s load flange and used with an upper slide plate manufactured from 304 stainless steel with a mirror finish. The upper slide plate can be welded to the base of a pipe shoe, trunnion, or the saddle of a pressure vessel. Each of the constant spring dimensions are 35-7/16″ in height and 75-3/4″ in length. They are designed for a piping system with 9″ of total travel at 979°F and an operating load of 6,183 lb. Each of these units were load tested to meet the hydro test load of 6,744 lb. before shipment.

Products such as these are used in many different kinds of plants all over the world including refineries, renewable diesel plants, chemical plants for operations such as propane/propylene splitter units, and power plants. We have the ability to custom design and manufacture constants for specific loads and various environmental conditions. A point to note, we provided similar constant spring supports supporting loads over 150,000 lb. for crude oil processing at one of the largest refineries in the world just last year (view this project). Petroleum refineries change crude oil into products such as jet fuel, gasoline, polypropylene, polyethylene, propane, sulfur, carbon black feed, and diesel that can be used for transportation, heating, feedstocks for making other chemicals, generating electricity, renewable energy, and paving roads.

 

PT&P REF. ORIGINAL POST 01122018

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Variable Spring Supports for a Major Pipeline Expansion Project

February 1, 2022

Ptp variable spring 182218

PT&P supplied F-type variable spring supports for pipeline 1150km long carrying various kinds of crude and refined products including gasoline, diesel, and jet fuel. The expansion tripled the capacity of the current line allowing for it to carry 85% of what is transported through British Columbia increasing oil tanker capacity at the terminal seven times.

The spring supports are designed for small movements and operating loads ranging from 15,679 lb. to 19,688 lb. The housing is fabricated from A-36 carbon steel, hot-dipped galvanized, and then painted with 3 different coats (primer, intermediate, and topcoat) of paint to protect against the harsh Canadian winters while providing long term protection against corrosion. These variables will include PTFE, 25% glass filled, slide plates welded to the top of the load flange to allow for translational movement. Each spring is load tested and then preset to the specified installed load and inspected for quality assurance before shipment.

Why PT&P?
For this particular project, the PT&P team worked with the client through the client’s six-month bidding process on the project. Our unique combination of experience, engineering expertise, and production knowledge enabled customers to secure the project. PTP addressed coating considerations, technical queries, and met the demanding delivery needs of the project. PT&P’s turnaround time from PO receipt to the material on-site was 10 weeks.

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