These hold-down pipe clamp assemblies are specially fabricated and include wedges with 25% glass-filled PTFE to absorb vibration and also serve as a buffer between the steel pipe and pipe support. Vibration can occur in Power, Solar, Biofuels, and Chemical plants because of flow-induced and/or acoustic-induced vibration due to the flow of fluids or gas/steam through the piping system. Similarly, vibration can occur in pipelines near rotating equipment such as reciprocating pumps and compressors resulting in pulsations or mechanical forces that can occur in both onshore or offshore production facilities. Vibration can be strong enough to cause premature failure or cracks resulting in unplanned shutdowns. These units shown in the photograph are custom-designed for pipe sizes up to 20″ in diameter and temperatures up to 200°F and can be adjusted to accommodate a range of heights for the T.O.S to the B.O.P. They are 21″ wide x 26″ long x 23″ high and are proven to greatly reduce vibration to acceptable levels. These hold-down pipe clamps are fabricated utilizing A 36 carbon steel plate and A 307 Gr. All-threaded rods. All components were hot-dipped galvanized and a quality control inspection was performed before shipment.
Follow these steps when inspecting and maintaining PTFE slide plates.
1. Inspect welds between backing plate and bottom of the saddle
2. Inspect adhesion of the PTFE slide plate
3. Inspect welds of the base plate of the bottom slide plate between the structural steel
4. Make sure you have a clean surface between the upper and lower slide plates
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Discover the secret to a lower coefficient of friction while permitting translational motion or movement with the supporting element. Learn about the different types of slide plates and pipe rollers used for various applications. View the design, load capabilities, and installation and maintenance guidelines for both slide plates and pipe rollers. See numerous photos featuring combinations with other critical pipe supports in order to allow for movement or a low coefficient of friction. Increase your understanding of the value added services that are offered by PT&P, and rest assured that your slide plate and pipe roller needs can be taken care of by our 24×7 web-based emergency services, field service, and quick-turn around time when you need it most.
PT&P custom designed PTFE slide plates for an oil refinery in Texas. These slide plate assemblies are comprised of 3/32″ thick 25% glass filled (PTFE) slide plates bonded to hot dipped galvanized carbon steel backing plates. The assemblies measure 47-1/2″ long by 36-1/2″ wide and 45″ long by 16″ wide. PTFE material provides a low coefficient of friction, is easy to install, does not require surface treatments, or grouting, and is unaffected by weather conditions.
These slide plate assemblies are comprised of 3/32″ thick PTFE, 25% glass filled slide plates bonded to 1/4″ thick hot dipped galvanized carbon steel backing plates. They measure 139″ long by 11-1/2″ wide, and were designed for a pressure of 2000 psi at -320°F to 500°F. PTFE, 25% glass filled material provides a low coefficient of friction, is easy to install, does not require surface treatments, or grouting, and is unaffected by weather conditions. These type of slide plates are typically installed on top of a concrete pillar under a large vessel.
Designed for 20″ to 30″ pipe sizes, these HD-2 and HD-3 hold-down pipe clamps were shipped to a gas pump station in South Dakota. The hold downs were fabricated from carbon steel with PTFE, 25% glass filled liners on the saddle portion and base of the pipe clamp. We fabricated a total of 22 hold down pipe clamps and shipped this rush job within one week.
These F-Type variable spring cans were designed with PTFE, 25% glass filled slide plates for a local oil refinery. Slide plates are used to reduce the friction between the load flange of the spring and the pipe support. This allows for easier adjustment of the spring’s installed height. These variables include external travel stops. The external travel stops are sometimes referred to as universal travel stops and can be utilized to adjust the installed load (also called the cold load) to other installed loads within the working range of the spring. 113 variable springs were supplied for this job. The variables have an installed load ranging from 95 lb. to 11,000 lb. and an operating load ranging from 90 lb. to 10,703 lb. They are part of a plant expansion and will be used to support horizontal piping in an oil refinery.
Our field service manager, David Baker, will show you what to look for when inspecting your PTFE slide plates. If you have any questions, feel free to call David Baker at 713-992-7048 or email us at firstname.lastname@example.org.
The slide plates are comprised of 1/4″ thick PTFE, 25% glass filled slide plates bonded to 1/8″ A240 grade 316 L stainless steel backing plates. Stainless steel was used for better resistance to corrosion and longevity. The assemblies measure 83″ long by 20″ wide and will be installed underneath a bridge. A total of 16 slide plates were fabricated and designed for a pressure of 500 psi at ambient temperature. PTFE, 25% glass filled material provides a low coefficient of friction, is easy to install, does not require surface treatments, or grouting, and is unaffected by weather conditions.
These customized bolted clamp pipe shoes with PTFE, 25% glass filled slide plates were fabricated for a radiant syngas cooler piping system in Indiana. The supports were designed for 24″ diameter piping with a pressure of 2,256 psig at 350°F. The axial displacement is +/- 1.326″ facilitated by slide plates on three quadrants. These pipe shoes were custom designed and fabricated entirely from carbon steel with a hot-dipped galvanized finish.
This custom designed variable spring assembly is comprised of a standard PTP-1-160 type F variable spring with a supplementary extension and load flange with a stainless steel slide plate. The variable is fabricated entirely from carbon steel with a hot-dipped galvanize finish. The extension is schedule 40 pipe, 8″ in diameter and 12-5/16″ in height. The slide plate is fabricated from A240 grade stainless steel and is welded to the top of the load flange. This support will be used underneath a 16″ diameter pipe with a dummy leg. It is designed for 1/16″ vertical travel and 1/8″ horizontal travel for an oil refinery in Algeria.
PipingTechnology and Products is the name of our company specializing in pipesupports, pre-insulated supports, slide plates, snubbers, sway braces, and muchmore. In business since 1975, Piping Technology has over 35 years of experiencein the engineering and design of high-quality pipe supports. Piping Technologyis a parent company to four subsidiaries including U.S. Bellows, Sweco Fab,Fronek Anchor/Darling Enterprises, and Pipe Shields.
Piping Technology: 35 Acre Facility
Bearing plates are used on a stationary support element and a moving pipe support component to provide a low-coefficient of friction between the two.
Stainless Steel Slide Plates Welded on Variable Springs
The slide plate assemblies are fabricated from stainless steel, phosphorus bronze, and carbon steel. The 2″ thick carbon steel base plate is securely anchored to a concrete foundation, and the stainless steel slide plates are affixed to the base plate by countersunk attachment bolts. The phosphorus bronze slide plates, with machined grooves on the underside are placed on top of the stainless steel plates.
To allow for lubrication between to the contact surfaces of the two slide plates, grease is added through a fitting on the side of the bronze slide plate. The fitting allows access to a channel in the center of the bronze slide plate that leads to the grooves. A hole is located in the 2″ thick base plate to allow for grout to be poured through after installation.
The slide plate assemblies were fabricated from a combination of stainless steel for the low-friction sliding surface and 2-3/4″ Marinite® insulation to isolate the higher temperatures. A fabric reinforced isolator pad was placed between the slide plate and the I-beam for vibration control. The slide plates were tested for both load and heat transfer and will be utilized in a chemical plant.
Pictured above are F-type variable spring supports designed for a local chemical plant. They are designed for a vertical movement of 1/8″ and an operating load ranging from 638 lb. to 2,612 lb. Fabricated using A-36 carbon steel components from our shop inventory, these variables include PTFE, 25% glass filled, slide plates to allow for translational movement. Each spring is preset to the specified installed load prior to shipment.
The top sheet of graphite measures 1/2″ x 11 1/2″ x 115 1/2″. This particular design also includes a bottom sheet of graphite with the same dimensions, but only 1/4″ thick. Each individual graphite sheet is bonded to a hot dipped galvanized backing plate with a 1/2″ lip all around for full welding. In an application where the pipe has large amount of movement due to thermal expansion, slide plates can be utilized to eliminate friction between the pipe support and the supporting member. Graphite is used when the slide plate must function at high temperatures. These particular graphite slide plates are designed for 1000ºF.
These pipe shoes are fabricated from A-516 GR70 carbon steel. PTFE, 25% glass filled, material is bonded to a carbon steel plate, then welded onto the shoe to allow movement of the pipe during expansion and contraction. The pipe shoes range in size from 18″ to 28″ in width and 28″ to 43″ in length.
Piping Technology & Products, Inc. designed and manufactured PTFE, 25% glass filled, slide plates for cable trays located on a floating structure. The slide plates are used to reduce the friction between the cable trays and the structural steel it is resting on. These particular slide plates are bonded to stainless steel backing plates that are bolted to the structure.
Piping Technology & Products, Inc. Performed Field Services for a Power Generating Plant in Texas
PT&P was contracted to assist in the determination of pipe support maintenance at a power plant in Texas. The constant effort support springs with loads of excess of 9,500 lbs and the variable spring supports with loads of 450 lbs were marked for needing attention.
PT&P’s objectives were to:
* Evaluate the pipe supports
* Determine state of performance
* Provide a plan of action
* Train personnel on-site to perform adjustments and replacement of supports or support components
* Provide final inspection of modified supports
The pipe supports needing attention could not be set to the required installation position. A plan was initiated to recondition some of the support components such as turnbuckles and rods. This would allow a greater range of field adjustment to the pipe supports. During a planned shut-down, PT&P Field Service Units returned to the site to modify the existing supports. The initial phase of the modifications included bracing the piping in order to isolate and lock the supports in position. Then, they were disconnected from the system and modifications to the assemblies were completed. Afterwards, the supports were reinstalled and any necessary adjustments were completed. A total of eight pipe supports were modified or adjusted.