High Temperature Pre-Insulated Pipe Supports with Slide Plates for an Ethylene Production Plant in Texas

March 27, 2018

High Temperature Pre-Insulated Pipe Supports For An Ethylene Production Plant In Texas

Type: High Temperature Pre-Insulated Pipe Supports with Slide Plates
Size: 15″ Long | 23″ Wide | 4.5″ Insulation
Material: Calcium Silicate, Firetemp®, Carbon Steel with HDG, UHMW Polyethylene
Design: 750°F, 1,325 lb Operating Load, & 12″ Pipe Size
Testing: Standard Quality Control

PT&P custom designed these pre-insulated pipe supports for high temperatures at an ethylene production facility in Texas. The hot shoes are 15″ long and 23″ wide with 4.5″ thick insulation. The insulation is comprised of calcium silicate and Firetemp®. The hot shoes were fabricated from carbon steel with a hot-dipped galvanized finish and the slide plates from UHMW Polyethylene. They are designed as a 2-way guide than can support loads in two directions. They are designed for a pipe size of 12″ in diameter with an operating temperature above 750°F and on operating load of 1,325 lb. Standard quality control tests were performed with a 4-week turn-around time.

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Field Service Inspection on Constant Spring Supports after 30 Years of Service on an Offshore Platform

March 12, 2018
Constant Spring 30Years Service2 Constant Spring Support After 30 Years Of Service


The use of zinc and galvanizing has a long history. The early patents for hot-dip galvanizing were issued in France and England in 1836 and 1837. This technology was quickly adopted and was widely used in the late-1800s.

In the United States, we have bridges more than 100 years old which have galvanized structures. In addition, we have transmission towers and substation structures that are over 70 years old. A pipe rack at a petrochemical plant near Houston was studied after 28 years of service. Measurements of the zinc thickness remaining provided a forecast of another 60 years of service.

Any coating which provides a barrier to the moisture and oxygen in the air will help protect carbon steel from corrosion. A properly painted surface will provide a barrier, but it is subject to scratching from contact with hard objects.

Constant Spring Support Inspection:

Visually inspect each Constant hanger:

Search for signs of visual cracks, fractures, and corrosion of the spring casing and the following:
(1) beam attachment
(2) pin
(3) constant hanger attachment
(4) pipe clamp attachment
(5) weldless eye nut
(6) threaded rod
(9) spring coil
(10) Check if travel stops are removed

Check (7) turnbuckle (if present), locknuts (8) and other threaded items to ensure they are secured and fastened

Compare the position of the (10) coil with the hot/cold load indicator and operating range of the spring

Check the mobility of the (11) load column


Replacement Criteria:

– Signs of excessive corrosion or fatigue

– Rust damage of entire unit

– Modifications to operating conditions

– Consider condition of components (cam mechanisms, bearings, etc.)

Our field service team is available 24×7 for your quick-turn, emergency needs.

Call Field Service: +1-713-992-7048

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