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Slide Plates Homepage > Webinar Archives > Slide Plates & Rollers



Slide Plates Presentation (April 2009)

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Text Version of the Slide Plates Presentation

For those unfamiliar with us, we would like to share some background information on our company. Our parent company, Piping Technology & Products, Inc., also known as PT&P, has been in business since 1975. PT&P and its wholly owned subsidiaries, US Bellows, Sweco Fab, Pipe Shields, and Anchor Darling, offer a wide range of engineered products and services for various industries and applications. Our product line is extensive, from spring supports, expansion joints, pre-insulated pipe supports, and miscellaneous fabrication to various engineering and technical services, PT&P has decades of experience providing products and services for all your engineering and construction needs.

We have achieved various certifications here at Piping Technology & Products. We have the ASME U-Stamp and R-Stamp for the SWECO division of our company. We are ASME NS certified in our Fronek Anchor/Darling, Enterprises division. We are also part of the Expansion Joint Manufacturers’ Association through our U.S. Bellows, Inc. division. Most recently we received the ISO 9001:2000 certification for the manufacture of hot and cold supports. We are a Minority Business Enterprise granted by the City of Houston, and additionally, we are a member of the Houston Minority Business Council.

PTFE, 25% Glass Filled Slide PlatesWe offer an expansive line of engineered pipe supports, products, and services. This includes, but is not limited to: Expansion joints, variable & constant spring supports, big ton spring supports, insulated hot & cold shoes, hydraulic shock and sway suppressors, mechanical snubbers & sway braces, sway strut assemblies, pig launchers & receivers, and various hardware to support these products. This webinars emphasis is slide plates, and the following is an in-depth look into this valuable product. The slide plates primary function is to offer an economical, cost-effective, and low impact way of adding a low coefficient of friction between two sliding surfaces. There are five different types of slide plates and their specifications. In general, a slide plate is most often utilized in the sandwich concept by most designers. This is where a low coefficient of friction material (the slide plate) is bonded to a backing plate (carbon steel), allowing an easier application of the lower friction coefficient to both the supporting and supported pieces. The sandwich makes it easier for both parties in the manufacturing facility and the on-site applications. For example, if a steel beam is crossing a concrete pier, the coefficient of friction between the two materials would be high and might be detrimental to the sliding beam. In this case, a slide plate could be placed on the steal beam and on the concrete pier to reduce the friction.

25% Glass Filled Polytetrafluoroethylene (PTFE) Slide Plates
The first type of slide plate material we will examine is 25% glass filled Polytetrafluoroethylene (PTFE). The glass filled fibers are added to improve the durability and strength characteristics. This slide plate is primarily used in low heat and high velocity conditions. However, this material can be used in high heat applications in conjunction with other materials. We also use this type of slide plate where there is high wear resistance, no surface treatments necessary, and it is unaffected by weather conditions. A few examples of where they are used are: highway bridges, airport hanger doors, domes, vibration pads, heat exchangers, heavy machinery, refinery equipment, wind tunnels, etc.

The standard assembly is used for the welding of the mating surfaces; which are two units of 3/32 thick PTFE, 25% glass filled bonded to 1/8" carbon steel with a 1/2" lip for field tack welding. For higher load capacities, we use a full weld assembly, which is two units of 3/32" PTFE, 25% glass filled bonded to indicated backing material with " lip all around for full welding.

A recent customer had us weld a PTFE, 25% glass filled slide plate to their variable springs where the pads are tack or stitch welded to the load flange. Another PTFE, 25% glass Filled Slide Platescustomer had us weld PTFE pads on top of the load flange of a constant spring support where the basic load capacity is 500-2000 lb. per square inch. Another application is an eight foot long big ton spring assembly fabricated from carbon steel components with a painted finish that was designed for a local area refinery. This big ton was designed to support heavy loads of over 76,800 lb. where a standard variable spring would be undersized. The top was designed rather large, around 8 feet by 2 feet, but the three PTFE slide plates did not occupy a great deal of space. Even though it had a large load, the slide plates only needed to cover an area of 192 square inches. We utilized 3 pads that were 8 x 8 to cover the needed area for support. This demonstrates how a small amount of slide plate material can alleviate a large amount of sliding friction while lowering the force required.

However, there are a few exceptions to the rule. For hold down supports, the backing plate can be eliminated by bonding the PTFE pad directly to the hold down. For this to happen, three conditions must be met. The surface area must be treated, prepared, and the bonding needs to be performed in a controlled environment. Lastly, a load application of pressure must be maintained entirely over the area that is being bonded. For these reasons, it is best not to attempt this in the field, but be performed in a facility within a controlled environment.

The coefficient of friction of PTFE, 25% glass filled slide plates has been reported to be from 0.01 to 0.2. This depends on the surface preparation, loading, velocity, and the duration of the test. Bonding PTFE, 25% glass filled slide plates to metal increases the load capabilities in excess of 2000 PSI. A conservative coefficient of 0.1 can be used in PTFE, 25% glass filled slide bearing designs without considering sliding speed, temperature, or maintenance. The advantages of using this material are: 1) no setting problems 2) low coefficient of friction, 3) no surface treatments, grouting or expensive mechanical attachment necessary 4) chemically inert 5) unaffected by weather conditions 6) ability to absorb dirt and grit within itself 7) self-aligning when used in conjunction with elastomeric backing pads.


Graphite Slide Plates

Graphite Slide PlatesA second type of slide plate that we manufacture is graphite. Graphite slide plates are used primarily in higher temperature applications and may be mechanically bonded or screwed where applicable. They can be utilized in areas where the temperature exceeds 1000F and while offering some of the same characteristics of PTFE, and are primarily bonded to a backing plate. The advantages of using this material are: 1) high operating temperature 2) ease of installation 3) no setting problems 4) low coefficient of friction 5) no surface treatments, grouting or expensive mechanical attachment necessary 6) chemically inert 7) unaffected by weather conditions 8) has the ability to absorb dirt and grit within itself 9) self-aligning when used in conjunction with elastomeric backing pads.

In our standard assembly, we use two units of graphite bonded to 1/8" thick carbon steel with " thick lip for field track welding. For full weld assembly, we use two units of Graphite bonded to the backing material with " lip all around for full welding. Graphite slide plates typically handle loads of up to 2,000 PSI and are designed for high operating temperatures of up to 1,000F. We designed eighteen graphite slide plates that will be tack welded on top of big ton spring supports in a refinery to minimize frictional effects. These plates where chemically bonded to their backing plate giving them a small lip around the graphite plate and backing plate. This allows the heat generated with welding to not despond at the edges of the graphite.

Bronzphite Slide Plates
The third type of slide plate material is Bronzphite. In essence, we are combining the backing plate and slide pad material into one unit. The backing plate is impregnated with the graphite usually in a circular and dot pattern. Bronzphite is best suited for high loads, low velocity applications and in places where the use of oil and grease is undesirable or not feasible. It is maintenance free and self lubricating where the lubrication does not deteriorate with wear. Therefore, it has a high wear resistance as well as prevents accumulation of dust and debris.

The only difference in utilizing the Bronzphite over other slide pate materials is that the Bronzphite backing plate itself is not directly welded to the supporting elements. It usually has a framework that helps hold it in position during the application of load and sliding of the materials in the fields. It also helps in combining multiple slide plates to support the load. Overall, it gives it a high degree of durability and no need for maintenance. It is also utilized in high impact loading conditions where graphite might be disturbed.

Marinite Slide PlatesMarinite Slide Plates
The fourth type of slide plate material is marinite. Marinite slide plates are utilized for two main characteristics: its low coefficient of friction for sliding and the calcium silicate insulating material sandwiched in-between. This helps insulate the higher temperatures above the slide plate from the lower temperatures below the slide plate. Marinite slide plates provide several important characteristics like high strength, insulation, and a low coefficient sliding surface. Marinite allows for the use of PTFE, 25% glass filled, as the sliding surface for lines with high operating temperatures and high dynamic loading. It protects the PTFE, 25% glass filled material by acting as a barrier to heat transfer. It has so far been used for power plants in high energy systems like SHP and SIP. The marinite acts as the insulator, while the PTFE is safe from the higher temperatures on the other side of the plate. Another application of marinite slide plate is placing them on some steal w-beams for insulation. The 3" thick marinite assembly isolates the high heat area above from the w-beams, allowing the use of steel to support the system.

Weve done multiple tests to verify the insulation and strength on marinite slide plates. In one test we checked the different layers of insulation marinite gave and how much thickness is needed for temperature insulation. Another test we performed checked the strength of the marinite framework needed. More insulation can be utilized when less framework is needed.

Stainless Steel Slide Plates
The fifth type of slide plate material is stainless steel. It is used in extremely corrosive environments and/or extreme temperature conditions. It has several benefits over the other materials. It can be applied where extreme durability is required, eliminates the need for a separate backing plate, and can readily be affixed to contours. It does not need a controlled environment and is easy to place in the field. It is the thinnest plate assembly available, can be modified in the field, and is available in a variety of surface finishes. A typical application of a stainless steel slide plate application would be bonding it to the face of a big ton spring. In a case like that, the slide plate would be welded directly to the load flange of the big ton assembly.

Installation
After bonding a PTFE, 25% glass filled, or graphite slide plate to a backing material, it needs to be carefully welded to the backing plate of the support. It is best to place a protective cover over the slide plate for protection against damage. A full weld is desirable to prevent seepage of water between the backing material and the supporting structure. Avoid overheating, which may destroy the bonding of the slide plate to the backing material.

In essence, that concludes the emphasis on slide plates. We fabricate many different standard products and support assembly components, some of which can be utilized with slide plates. We manufacture variable spring hangers, constant spring supports, big tons, upthrust constants. We mentioned earlier uses for slide plates with both big tons and constants. We also manufacture mechanical snubbers, hydraulic snubbers, sway braces, hold downs, pipe saddles, clamps, clamp assemblies, expansion joints, and much more. We keep a large inventory and stock available in all of our standard products. In relation to slide plates, we keep a large inventory of pre-assembled products with slide plates already bonded and ready for shipping.

Piping Technology and Products, Inc. provides personnel for onsite installation guidance, inspection & maintenance, on-call engineering, and we are available 24x7. PT&P has engineering capabilities like pipe support design, 3D modeling, pipe analysis, FEA analysis, and PDS collaboration. The 24x7 emergency link is located on our website, and we guarantee a response within 30 minutes. An example of this being utilized is when an expansion joint failed at 5 pm in a plant in Alaska. By Saturday, the drawing had been submitted to replace the expansion joint and approved. We started fabrication on Saturday afternoon, and by early morning on Sunday, the expansion joint was completed and then inspected before it was shipped off. By late Sunday evening, the expansion joint was back in service. We also provide a variety of product testing and have the ability to test any product that we manufacture.

That concludes our presentation on slide plates and we thank you for attending our webinar. For any questions you may have, you can email us at info@pipingtech.com.

 

 

 

 

 

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