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Presently, blind flanges are used to provide an airtight cover to various piping systems that include pipelines in the oil industry, heat exchangers, ships, tanks, etc.
Routine maintenance requires the heavy duty blind flange to be removed for cleaning and repairs. However, for these types of flanges, it is quite difficult to disassemble, clean and repair. It typically requires employing a forklift, crane, or other lifting devices. This can require excessive man-hours, and the alignment of the flanges can remain unpredictable.
PT&P introduced a closure flange hinge with specially designed self‐locking bolts and two self-lubricated hinge studs to support the blind flange when all the fastening bolts are removed for maintenance or replacement. The blind flange can be opened like a “door” with little effort. Our product opens up to 180 degrees, providing full accessibility to work on the pipeline, heat exchanger, or other equipment.
To solve the issues, PT&P invented two versions of closure flange hinges for blind flanges: temporary / removable hinge and permanent / fixed hinge
PT&P recently designed 159 permanent and removable hinges for up to 72″ diameters, We can accommodate for larger sizes upon request.
View PDF Handout on Closure Flange Support Hinges
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View PDF on Personnel Protection Shields
| Type: | Personnel Protection Shields |
| Size: | 11″ Dia. | Up to 48″ Lengths |
| Material: | Carbon Steel | 2-Coat Paint System |
| Design: | Operating Temps. Require Safeguarding Personnel |
PT&P custom designed, fabricated and provided installation oversight for sixty-five personnel protection shields for a refinery in Texas. The personnel protection shields are used when insulating the line is not necessary, but operating temperatures require safeguarding personnel from coming into contact with the pipe. These shields are fabricated from carbon steel with a two-coat paint system. They are 11” diameter, and range in lengths up to 48”.
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| Type: | Cryogenic Insulated Supports |
| Size: | Range: 6″ to 24″ Dia. Pipe |
| Material: | Carbon Steel | Hot-dipped Galvanized | PUF |
| Design: | 15,000 – 30,000 lb. Load | -112 F | +/- 2″ Movement |
Over 300 pre-insulated pipe supports were custom fabricated for a cryogenic pipeline at an LNG facility in Louisiana. High density polyurethane foam was used for insulation, with thicknesses ranging from 2” to 4”. The cold shoes are for pipe diameters ranging from 6” to 24” and are fabricated from carbon steel with a hot-dipped galvanized finish. They are designed for temperatures down to -112°F, movements of +/-2” and operating loads ranging from 15,000 to 30,000 lb. Standard quality control tests were performed prior to shipment.
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| Type: | Insulated Support – Micarta® Block Assembly |
| Size: | 2″ H x 12″ W x 81″ L |
| Material: | Micarta® | PTFE, 25% Glass-filled |
| Design: | -454°F | Visual / Dimensional Tests |
PT&P designed Micarta® block assemblies for placement beneath the saddle support of a vessel at an oil refinery in Texas. These insulated supports measure 2” x 12” x 81” and include PTFE, 25% glass-filled material bonded to the top of the Micarta®. Micarta® consists of glass fabric with an epoxy resin, which provides great insulating characteristics and superior physical properties. The blocks are designed to prevent cryogenic temperatures down to -454°F from transferring past the base of the support to the supporting steel or foundation. Visual and dimensional tests were performed prior to shipment.
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| Type: | Variable Spring Supports |
| Size: | Accommodate Elevation Difference up to 11′-5″ |
| Material: | Carbon Steel | Hot-dipped Galvanized |
| Design: | 20,000 lb. Load | 4,700 lb./in. Spring Rate |
PT&P designed and manufactured over 50 variable spring supports for a propane dehydrogenation unit in Texas. The spring cans, rods, welded beam attachments, turnbuckles and clevises are fabricated from hot-dipped galvanized carbon steel. The variables can accommodate an elevation difference up to 11’-5” from the bottom of the steel to the connection of the pipe. They were designed for an operating load of 20,000 lb., a spring rate of 4,700 lb./in. and 0.007” upward movement. Standard load testing was conducted prior to shipping.
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| Type: | Hold-Down Pipe Clamps |
| Size: | 8″ Dia. Pipe |
| Material: | Carbon Steel | HDG |
| Design: | Up to 400°F Temperatures |
PT&P designed and manufactured standard HD-2 hold-down pipe clamps for an LNG plant in Australia. They are fabricated from hot-dipped galvanized carbon steel and include PTFE slide plates. The hold-downs are designed for 8″ diameter pipe and an operating temperature up to 400°F. The HD-2 is a restraint type hold down which allows axial movement while restraining lateral movement.
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| Type: | Pre-insulated Pipe Supports “Cold Shoes” |
| Material: | CS | Red Oxide Primer | PUF Insulation |
| Size Range: | 1/2″ – 6″ Thick Insulation | 1″ – 18″ Dia. |
| Design: | -300°F Temperature | Lateral Restraints / Guides |
PT&P custom designed more than one-hundred cryogenic pipe supports for a nitrogen facility in Colorado. The cold shoes are designed for pipe sizes ranging from 1″ to 18” diameter. They are designed with polyurethane insulation ranging from ½” to 5” thick. The clamps are carbon steel and coated with a red oxide finish. The cold shoes are designed as lateral restraints/guides that can support loads in two directions. Standard quality control tests were performed with a 6-8 week turn-around time.
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| Type: | Big Ton Spring Supports |
| Material: | Carbon Steel w/ HDG Finish |
| Design: | 13,457 lb. Load | 0.35" Vertical |
| Testing: | Load and Travel Tests |
These big ton springs are used in supporting large heavy units such as compressors, vessels and pumps in power and petrochemical plants. The housing and frame are fabricated from carbon steel and hot-dipped galvanized, and the spring coils are dipped in a neoprene coating. The units are 48” x 40” x 20”. The big ton spring support is designed to allow limited movement of 0.35″ upwards and an operating load of 13,457 lb. This design saved the customer from having to entirely redesign the piping system, which saved them thousands of dollars. Load and travel tests were performed prior to shipping to an oil refinery in Australia.
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