Variable Springs for a High-Temperature Furnace Application

June 13, 2022

PT&P Custom Designed Furnace Spring Support Cans For Chemical Plant
PT&P custom-designed and fabricated variable spring supports for a furnace application at a chemical plant in California. The furnace cans are manufactured from carbon steel and painted with red oxide primer because they are exposed to high temperatures where hot-dipped galvanizing is not feasible. The springs are designed for an operating load of 1,261 lb., with movement of 9″ and dimensions of 6″ x 52″ in length. Load tests were performed prior to a 12-14 week shipment.

Within a Reformer, heat-resistant cast alloy tubes are used to produce hydrogen during the process of desulfurization in refining plants, ammonia, methanol, and fertilizer plants. These catalyst tubes (also called reformer tubes) are periodically changed within the units after years of operating under high pressure and temperatures. The new or replacement tubes are manufactured from alloy material that can be lighter or heavier than the previous tubes installed. As a result of this weight change, new furnace springs may also need to be replaced.

Most recently we completed a project for a key client for the largest refinery in Central America with a specialized design using our nano-constant, the world’s smallest constant spring hanger. It supports 765 pounds of load and 7″ of travel in a 0.89 cubic foot envelope (7″ x 10″ x 22″). This particular furnace application required very stringent requirements of load deviation of less than 3% and all supports were made from stainless steel to meet furnace requirements. So, for these particular units, no coating was required since they were manufactured from stainless steel. In order to accomplish this special requirement, our engineering team designed and manufactured a new constant load test machine in-house.

We have manufactured various types of furnace springs and constants for a variety of EPC firms over the past few decades. Our experience and knowledge of the different designs and configurations have helped us to become one of the leading manufacturers of springs and pipe supports for furnace applications.

PT&P REF. ORIGINAL POST 07232018

240 Type-C Furnace Springs Supplied to Indonesia

December 16, 2019

 

240 Custom Designed Type-C Furnace Springs for a Furnace Application in Indonesia

Type: Variable Spring Supports
Size: 95-1/16” Overall Length
Material: A36 Carbon Steel
Design:  2,033 lb. Load | 225 lb./in Spring Rate
Testing: Load and Travel Tests

PT&P custom designed 240 of these Type-C furnace springs for a customer in Indonesia. The assemblies are completely fabricated from A36 carbon steel with a red oxide primer finish. The completed spring hanger assemblies are 95-1/16” overall length. They are designed for an operating load of 2,033 lbs and have a spring rate of 225 lbs./in. To ensure quality the furnace springs had a spring load test report and a spring calibration test to ensure spring rate shall not deviate more than +/- 5% from catalog value.

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