Piping Technology & Products, Inc. recently assisted in the design and fabrication of a special hot shoe with adjustable lateral stops for an oil refinery in LA. The shoe assembly is designed to support loads up to 6000 lb. and to guide pipes that may reach up to 1200°F. The hot shoe consists of a 12 thick mineral wool insulation, an inner clamp surrounded by four load transfer plates, an outer guiding clamp, and four guide assemblies with PTFE, 25% glass filled, slide plates. The load transfer plates provide support and prevent damage to the insulation between the inner and outer guiding clamp.

The guide assemblies (comprised of the four guides on the shoe and the adjustable stops) are designed to account for lateral, vertical, and axial movement. PTFE, 25% glass filled, slide plates are used to minimize friction caused by movement between the shoe and the adjustable stops. The adjustable stops are fabricated from a 1 x 12 x 19 carbon steel plate with four rods and two angles. These allow for flexibility in adjusting the distance/gap within each guide assembly to control movement.

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Piping Technology & Products, Inc. recently designed and manufactured twenty 28″ dia. Hotshoes (high temperature pre-insulated pipe supports) for a natural gas plant in Massachusetts. These supports are assembled with a 5″ thick high-density Calcium silicate insulation layer, in addition to stainless steel, Kaowool, and PTFE, 25% glass filled, slide plate materials. The supports are designed to support loads from 25 kips-50 kips at an operating temperature of 1800 degrees F. The shoes also allow for a travel of 7″ where applicable. PT&P also designed and fabricated rod hangers with variable spring supports for this project.

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Piping Technology & Products, Inc. designed and manufactured 44 shoes consisting of six guided and axial hot shoes, 10 guided hot shoes, and 28 sliding hot shoes. The materials used were calcium silicate, Marinite®, stainless steel plates, and PTFE, 25% glass filled. These shoes were designed for 8″ pipe with 7″ insulation with a load capacity of 5,100 lbs.

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Piping Technology & Products, Inc. designed and manufactured 60 Marinite® hot shoes for a chemical plant in Texas.

These hot shoes are composed of Marinite®(high-density calcium silicate) and carbon steel.  They were made for 8 NPS with 7 insulation.  These shoes are used on steam lines, effluent lines, and any other process lines where it’s imperative that thermal energy is not lost through the pipe support.  Tests were performed to show outer skin temperature at operating conditions.

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Piping Technology & Products, Inc. supplied both “hot shoes” for high temperature lines and “cold shoes” for cryogenic lines in this new plant. The shoes sit on the steel beams of the pipe rack and support the insulated pipe. The bottom photograph shows several of the shoes prior to shipment. The two large cold shoes in the foreground are lined with PUF (polyurethane foam) which functions both as an insulator and as a load bearing member at temperatures as low as –300oF. Hot shoes are lined with calcium silicate or Marinite® which can function up to 1200oF.

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The pictures above show insulated pipe supports designed for two very different temperature applications. The top picture shows an inspector checking “hot” shoes for high temperature piping. They have one 180 degree section of the insulation made of foam glass and the other 180 degree made from calcium silicate. Some components are chosen for their insulating properties only, other must both insulate and support the load of the pipe. The bottom picture shows a 54 inch “cold” shoe of galvanized steel with PTFE slide plates on the bottom. Inside the galvanized steel is bonded a layer of polyurethane foam which has been coated with a white vapor barrier. This polyurethane layer provides both insulation and support of the load at cryogenic temperatures.

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