Custom "Mini" Big Ton Spring Supports Designed for a Centrifugal Fan in an Chemical Refinery

May 26, 2013

Custom &Quot;Mini&Quot; Big Ton Spring Supports Designed For A Centrifugal Fan In An Chemical Refinery

PT&P custom designed “mini” big ton spring supports to support a large centrifugal fan at a chemical refinery in Texas. They are designed to support a total weight of 33,000 lb. within a maximum space envelope of 4″ wide x 16″ long x 8″ tall. As a result, these mini big-tons were fabricated using coils which could be placed in parallel within their respective frames. Four of the unites were comprised of four inner coils nested inside four outer coils to produce an operating load of 4,478 lb. and an overall spring rate of 2,740 lb./in. The smaller load capacity units were configured of four individual coils in parallel with an operating load of 3,735 lb. and a spring rate of 2,300 lb./in. The frame, load flange and all internal components were fabricated from carbon steel. The spring coils were fabricated from ASTM A-5160 spring steel. All supports were tested through their total working range to confirm load capacity and functionality.

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Cryogenic Trunnions with Permali® Blocks Designed for Ethylene Loss Recovery Lines

May 20, 2013

Cryogenic Trunnions With Permali&Reg; Blocks Designed For Ethylene Loss Recovery Lines

PT&P designed cryogenic trunnion supports for ethylene loss recovery lines at a plant in Texas. The trunnions were fabricated from 2″ dia. stainless steel pipes and have a maximum height of 3′. They include 6″ x 6″ permali® blocks measuring 2″ thick each. The permali® block isolator is a laminated phenolic material from layers of wood impregnated under vacuum and heat with synthetic resin. The temperature range for these supports is from ambient to -300°F.

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72" Dia. Cryogenic Pipe Supports Designed for an LNG Facility

May 6, 2013

72&Quot; Dia. Cryogenic Pipe Supports Designed For An Lng Facility

Custom designed cryogenic pipe supports were fabricated for an LNG facility in Africa. The shoes range in diameter from 30″ to 72″, 45″ to 88″ in height, 42-1/2″ to 85-1/2″ in width, and 28″ to 33″ in length. The insulation is a high density polyurethane foam (PUF) ranging from 5″ to 6″ thick. The shoe and bearing plates were fabricated from carbon steel with a HDG finish. The jacket was fabricated from aluminized steel and includes a vapor barrier.


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