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177

http://www.pipingtech.com/slideplates

BRONZPHITE SLIDE PLATESPTFE, 25% GLASS FILLED SLIDE PLATES

MARINITE SLIDE PLATE X 11 X 120 GRAPHIT E SLI DE PLATE S FOR 1,000 F

PTFE, 25% Glass Filled - Graphite - Bronzphite - Marinite

SLIDEPLATES


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SLI DEPLATES

www.pipingtech.com/slideplates

SLIDE PLATE ASS EMBLIES WITH 2 MARINITE BLOCKS

8 DIA. HD2 HOLD DOWNS LINE D WITH PTFE, 25% GLASS FILLED SLIDE PLATES

43 ANGLED PIPE SHOE WIT H PTFE SLIDE PLATE

SLIDE BEARING PLATES

DESCRIPTION PAGE

Introduction ...............................................................................................................................................................................

PTFE, 25% Glass Filled Slide Plates

PTFE, 25% Glass Filled Data Sheet .................................................................................................................................

Load and Temperature Limits ..........................................................................................................................................

Coeffi cient of Friction Vs. Load ........................................................................................................................................

PTFE, 25% Glass Filled Specifications ...........................................................................................................................

Graphite Slide Plates

Graphite Data Sheet ...........................................................................................................................................................

Graphite Specifications ......................................................................................................................................................

Standard Assembly Configurations ......................................................................................................................

Bronzphite

Bronzphite Data Sheet .....................................................................................................................................................

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179www.pipingtech.com/slideplates

SLIDE BEARING PLATESSlide bearing plates are a very cost-effective way of providing for movement of mechanical systems. Piping Technology

& Products, Inc. supplies slide bearing plates for a variety of applications including support of piping, heavy equipment

such as pressure vessels, and structural steel members. The plates provide a surface with a low coeffi cient of frictionwhich can be attached to a supporting structure. This combination provides support while simultaneously allowing an

object to move (slide) freely along the supporting surface.

Most designers use the sandwich concept when applying slide plates to their systems. Diagram A (on Page 180) shows a

sandwich composed of two identical slide plates, one on top and another on the bottom. Each slide plate is composed

of two components: a metal backing plate (which is like the bun of the sandwich) and a low coeffi cient of friction mate-

rial which is bonded to the metal backing plate.

In a typical application, a slide bearing plate is welded to a structural steel member which is strong enough to provide

the required support, but whose coeffi cient of friction is too high. When the pipe supported by the member moves (due

to thermal expansion, for example) it slides across the surface of the bearing plate without contacting the steel beam. To

return to our sandwich metaphor, the top half of the sandwich is bonded to the pipe, and the bottom half to the steel

beam.

One combination of materials that we recommend is that of PTFE, 25% glass filled, bonded to stainless steel. Both materi-

als resist oxidation and have long lives even in stressful environments. For large slide plates, galvanized steel can be used

in place of stainless to reduce the cost.

TEMPERATURE CONSIDERATIONSPTFE, 25% glass filled, provides a low coeffi cient of friction for most combinations of temperature and load. Diagram B,

on Page 181, shows the recommended conditions for PTFE, 25% glass filled. For most applications, PTFE, 25% glass

filled, is adequate when the temperature is less than 400 F. When the slide bearing plate must function at higher tem-

peratures, graphite can be used instead of PTFE, 25% glass filled. The load-bearing capacity of graphite is not sensitive

to increases in temperature, but the adhesive used to bond the graphite to its metal backing is. It is good practice to use

additional mechanical fasteners such as counter-sunk screws to help hold the graphite in place when the temperaturesare above 500 F. For combinations of temperature and load beyond the capabilities of graphite, special designs must be

considered.

ATTACHMENT CONSIDERATIONSWelding is the most common method of attaching the slide bearing plate to supporting metal structures. When this

approach is used a lip must be built since the weldings extreme temperature may break the bond between the low-

friction material and the metal plate. A lip is adequate for most welded installations. When welding cannot be used

(for safety or other reasons) to attach the slide plates, bolting is the most common substitute.

Before we begin constructing your slide bearing plates, we need to know the following:

The material you desire for the low-friction surface, based on the highest combinations of temperature and

load the component will experience. PTFE, 25% glass filled and graphite are the most common choices.

The desired size and shape for the low-friction surface.

The type of metal you desire for the plate backing. Most designers choose galvanized or stainless steel.

The size and shape for the metal plate backing of the low-friction surface.

Slide bearing plates are components of many products Piping Technology & Products, Inc. supplies such as guided pipe

shoes and upthrust constants. As a result, we have extensive experience in bonding PTFE, 25% glass filled, and graphite

to metal plates. Modern adhesives are adequate for most applications. However, mechanical fasteners such as counter-

sunk screws can be added when needed. If you have unique applications, we will be happy to custom design a practical

solution for your application.


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SLI DEPLATES


PTFE, 25% GLASS FILLED SLIDE PLATE

ASSEMBLY: Standard Assembly: 2 units of PTFE, 25% glass filled, bonded to carbon steel. For fieldtack welding, lip. Loads to 2,000 PSI, temperature: -320 F to 500 F.

Full Weld Assembly: 2 units of PTFE, 25% glass filled, bonded to indicated backing material

with lip all around for full welding. Loads to 2,000 PSI, temperature: -320 F to 500 F.

PART # -- PTP -- PTFE, 25% GLASS FILLED -- 10 GA. SS -- LIP AND SIZE

ADVANTAGES: Ease of installation. No setting problems.

Low coeffi cient of friction.

No surface treatments, grouting, or expensive mechanical attachment necessary.

Chemically inert.

Unaffected by weather conditions.

Ability to absorb dirt and grit within itself.

Self-aligning when used in conjunction with elastomeric backing pads.

APPLICATIONS: Bridges: Highway bridges, overpasses, railroad bridges.

Architectural in Wood, Concrete or Steel: Cross beam and girder slip joints, roof slabs and

corbels, vibration pads, airport hangar doors, domes.

Industrial: Heat exchangers, dust collectors, heavy machinery, refinery equipment, wind tun-

nels, penstocks, vessels, pipelines, air preheaters, atomic energy applications, transmission tow-

ers, storage tanks, offshore drilling rigs.

ORDERING: 1. Please specify the dimensions of the upper plate and dimensions of the lower plate. It iscommon practice that the upper plate is generally larger than the lower plate.

2. Specify lip dimension (if different than standard ).

3. Specify base plate thickness (if different than standard ).

INSTALLATION: Prior to Welding: Locate the slide plate base in the appropriate position on the existing steel

surface. Place a protective covering on the PTFE, 25% glass filled. Where seal welding is notrequired, follow the diagram shown which indicates thick fillet weld, 1 long every 4 around

entire perimeter of the base. For welding, use GMAW 0.035 wire or SMAW stick.

Where full seal welding is required, use a similar pattern of welding until a full weld is obtained.

This method will prevent damage to the PTFE, 25% glass filled (A full weld will help prevent seep-

age of water between the slide bearing plate and the support structure.). Avoid overheating,

which may destroy the bonding of the PTFE, 25% glass filled to the base plate.

Installing in Concrete: Secure the top and bottom elements together with paper adhesive

tape. Then attach the bottom element anchor bolts with wire to the form. After the bottom

pour is made, repeat on top element. During the first expansive cycle, the tape will break.

DIAGRAM A


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PTFE, 25% GLASS FILLED, TEMPERATURE AND FRICTION GRAPHS

It has been determined from basic test-

ing that the ideal thickness of PTFE,

25% Glass Filled, should be . If thedesign engineer follows the given chart

(left) for the Eect of Temperature on

PTFE, 25% Glass Filled, there will not be

a failure.

Diagram B

The Coeffi cient of Friction of PTFE, 25% Glass Filled, slide plates has been reported to be from 0.01 to 0.2. This depends onthe surface preparation, loading, velocity, and the duration of the test. Bonding PTFE, 25% Glass Filled, to metal increases

the load capabilities in excess of 2,000 PSI (For design purposes, use 500 PSI). This table shows the coeffi cient of friction

due to the load applied. A maximum coeffi cient of 0.1 can be used in PTFE, 25% Glass Filled, slide bearing designs without

considering sliding speed, temperature, or maintenance.


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SLI DEPLATES


PTFE, 25% GLASS FILLED, SPECIFICATIONS

MECHANICAL PROPERTY VALUE ASTM TEST METHOD

Specific Gravity Measured 2.1 - 2.3 D638Water Absorption (%) 0.013 D570-59T

Hardness, Shore D

@ 78 F

@ 300 F

57

56

D2240

Wear Factor K less than 10 x 10-10

Tensile Strength (PSI) 2,000 min. D1457-56T

Tensile Elongation (%) 200 - 250 D1457-56T

Flexural Strength (PSI) 606 D790-59T

Modulus (PSI) 2.39 x 105 D638

Compressive Strength (PSI)

0.2% offset 1870 D695-54

Deformation at 78 F, 2000 PSI

24 hr.

Permanent Deformation (%)

7.1

3.9 D621-59 (modified)

Deformation at 78 F, 2000 PSI

100 hr.

Permanent Deformation (%)

8.9

4.4

Coeffi cient of Friction 0.06 for loads

> 500 PSI static

Modified

ELECTRICAL PROPERTY VALUE ASTM TEST METHOD

Dielectrical Strength in air (v per mil) 327 D149A

Dielectrical Constant @ 60 cps 2.63 D150-54T

Volume Resistivity (ohm-cm) 1013 D257-57T

THERMAL PROPERTY VALUE ASTM TEST METHOD

Coeffi cient of Linear Thermal Expansion

(per F)

6.98 x 10-5 D694-44

Coeffi cient of Thermal Conductivity

(Btu-In.) hr-sq. (ft. F)

3.12 Cenco-Fitch

Continuous Service Temperature (F) 550 Various

Weatherability Unaffected Physical exposure


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GRAPHITE SLIDE PLATE

ASSEMBLY: Standard Assembly: 2 units of graphite bonded to carbon steel. For field welding, lip.Loads to 2,000 PSI, temperature: 1,000 F air, 3,000 F inert.

Full Weld Assembly: 2 units of graphite bonded to indicated backing material with lip all

around for full welding. Loads to 2,000 PSI, temperature: 1,000 F air, 3,000 F inert.

PART # -- PTP -- GRAPHITE ( OR ) -- CS -- LIP AND SIZE

ADVANTAGES: High operating temperature. Ease of installation.

No setting problems.

Low coeffi cient of friction.

No surface treatments, grouting, or expensive mechanical attachment necessary.

Chemically inert.

Unaffected by weather conditions.


Architectural in Wood, Concrete or Steel: Cross beam and girder slip joints, roof slabs and cor-bels, vibration pads, airport hangar doors, domes.

Industrial: Heat exchangers, dust collectors, heavy machinery, refinery equipment, wind tunnels,

penstocks, vessels, pipelines, air preheaters, atomic energy applications, transmission towers, stor-

age tanks, offshore drilling rigs.

ORDERING: 1. Please specify the dimensions of the upper plate and dimensions of the lower plate. It is com-mon practice that the upper plate is generally larger than the lower plate.

2. Specify lip dimension (if different than standard ).

3. Specify base plate thickness (if different than standard ).

INSTALLATION: Prior to Welding: Locate the slide plate base in the appropriate position on the existing steel

surface. Place a protective covering on the graphite. Where seal welding is not required, followthe diagram shown which indicates thick fillet weld, 1 long every 4 around entire perimeter of

the base. For welding, use GMAW 0.035 wire or SMAW stick.

Where full seal welding is required, use a similar pattern of welding until a full weld is obtained.

This method will prevent damage to the graphite (A full weld will help prevent seepage of water

between the slide bearing plate and the support structure.). Avoid overheating, which may

destroy the bonding of the graphite to the base plate.

Installing in Concrete: Secure the top and bottom elements together with paper adhesive tape.

Then attach the bottom element anchor bolts with wire to the form. After the bottom pour is

made, repeat on top element. During the first expansive cycle, the tape will break.


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SLI DEPLATES


GRAPHITE SPECIFICATIONS

PROPERTY

ROOM TEMPERATURE

UNITS AVERAGE UNITS METRIC AVERAGE

Bulk Density lb. /ft.3 99.26 Mg/m3 1.59

Specific Resistance

With Grain

Across Grain

10-4ohm-in.

3.33

4.74

ohm-meter

8.47

12.05

Flexural Strength

With Grain

Across Grain

PSI

1297

995

k Pa

(kN/m2) 8940

6860

Tensile Strength

With Grain

Across Grain

PSI

713

630

k Pa

(kN/m2) 4920

4340

Compressive Strength

With Grain

Across Grain

PSI

2877

2802

k Pa

(kN/m2) 19840

19320

Youngs Modulus

With Grain

Across Grain

106PSI

0.96

0.61

M Pa

(MN/m2) 6620

4210

Coeffi cient of Thermal Expansion

With Grain

Across Grain

10-6/ F

0.72

1.35

10-6/ C

1.32

2.43

Thermal Conductivity

With Grain

Across Grain

BTU x ft

hr. x ft.2x F 88

62

W / m x C

152

107

Permeability

With Grain

Across Grain

Darcys

0.493

0.444

Coeffi cient of Friction 0.15 0.15


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STANDARD ASSEMBLY CONFIGURATIONS

WELDING DIAGRAMS FOR PTFE, 25% GLASS FILLED SLIDE PLATES AND GRAPHITE SLIDE PLATES

SLIDE PLATES FOR WELDING TO MATING SURFACES SLIDE PLATES FOR HIGHER LOAD CAPACITIES

Notes:1. Pressure range: 75 PSI to 2,000 PSI

2. Temperature range: -320 F to 400 F

3. Alternate backing materials are available.

Notes:1. Pressure range: 75 PSI to 2,200 PSI


3. Alternate backing materials are available.

SLIDE PLATES FOR DEFLECTION & EXPANSION AT HIGHERLOADS

SLIDE PLATES FOR HIGH TEMPERATURE & HIGH LOADBEARING

Notes:

1. Pressure range: 75 PSI to 1,500 PSI


3. Alternate thicknesses of reinforced elastomer avail-

able.

Notes:

1. Pressure range: 100 PSI to 2,500 PSI

2. Temperature range insulator: 400 F to 800 F

3. Coeffi cient of friction:

0.10 @ min. pressure

0.06 @ max. pressure


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SLI DEPLATES


BRONZPHITE SLIDE PLATE

ASSEMBLY: Standard Assembly: Graphite impregnated bronze plate combined with a carbon steel backingplate, to be field welded. Loads up to 5000 PSI, temperature: up to 1100 F.

ADVANTAGES: Maintenance free. Self lubricating.

High wear resistance.

Has an extended life.

Lubrication does not deteriorate with wear.

Prevents accumulation of dust and debris.

Higher durability than standard graphite.

Withstands extreme pressures and high temperatures.


Architectural in Wood, Concrete or Steel: Cross beam and girder slip joints, roof slabs and

corbels, vibration pads, airport hangar doors, domes.

Industrial: Heat exchangers, dust collectors, heavy machinery, refinery equipment, wind tun-

nels, penstocks, vessels, pipelines, air preheaters, atomic energy applications, transmission tow-

ers, storage tanks, offshore drilling rigs.

ORDERING: 1. Please specify the dimensions of the upper plate and dimensions of the lower plate. It iscommon practice that the upper plate is generally larger than the lower plate.

2. Specify base plate thickness.

INSTALLATION: Welding: Generally, tack weld with the electric arc along the outside edge for a solid installation.Wherever full weld is desired, a weld is used along the sides of the base plate to the substrate.

The full weld would prevent seepage of water between the Bronzphite bearing and the support

structure.

Installing in Concrete: When installing Bronzphite slide plate assemblies in concrete, anchor

bolts will be integrated into the base plates for attachment to either the concrete form rebar

structure or simply within the concrete itself.

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