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LINING MATERIAL COMPARISON

Procedure

No.

:

Rev. : 0

Rev. Date : Jan 31, 2012

Page :

NO DESCRIPTION RUBBER LINING FRP LINING PTFE LINING

1 Lining Material a. Natural Rubberb. Butylc. EPDMd. Nitrile Rubbere. Urethanef. Neopreneg. Hypalon

Resin : Epoxy, PolyesterReinforce : Fiberglass

a. Hardware : Carbon or StainlessSteel

b. Lining : PTFE

2 Temp Resistance (max) Below 100 deg C Max 104 deg C 260 deg C max, 200 deg C continuous

3 Chemical Resistance Depend on Rubber Material The chemical resistance and life

expectancy of fiberglass pipingsystem is dependent of many factors

including type of resin, curing

agent, liner material, liner thickness,

filler, and cure profiles.

Resistance to almost all kind of

chemical except alkali metals, fluorineand chlorine trifluoride

4 Abrasion Resistance Limited to kind of rubber shore

hardness

Fiberglass piping system with

typical corrosion barriers aresomewhat abrasion resistance.

Good abrasion resistance for slury

when velocity less than 2~4 ft/sec.

5 Advantage a. Prefabricated sheetsb. Constant thicknessc. High elasticity

a. Corrosion Resistanceb. Non Conductive

a. Plastic lined pipe represents one ofthe most widely used forms of acomposite structure. The

mechanical properties and low cost

of carbon steel are combined with

the chemical resistance of the

plastic lining material.

b. The properties of the liner materialsuch as chemical resistance and

continuous service temperature can

be readily tailored to the specific

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conditions of the application while

still maintaining the use of low

cost steel for the mechanical and

impact properties.

c. The excellent release propertiesand non-fouling properties of some

plastic materials reduce fouling,the resulting pumping energy

losses, and required downtime forclean out.

d. Plastic lined pipe is safer from amechanical abuse standpoint than

self-supported plastic pipe. Self-supported plastic is not permitted

in critical applications by some

chemical companies for safety

reasons.

e. Plastic pipe, either lined or self-supported, results in improved

product purity due to the lack of

metallic contamination. This is of

particular importance for thesemiconductor, pharmaceutical,

and fine chemical industries.

f. Plastic lined pipe is not sensitive tochanges in chemical resistance due

to process changes from oxidizing

to reducing atmosphere as some of

the metals are.

g. Plastic pipe, lined or self-supported, is not subject to crevice

corrosion or chloride pitting as

some of the metals are.h. Significant cost/performance

benefits exist for plastic lined pipe

compared to corrosion resistant

metal pipe, especially considering

fully installed cost.

i. Most plastic lined pipe has a built-in gasket eliminating the need for a

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separate gasket to prevent leaks,

simplifying installation and

maintenance. The gasketed surface

has the same chemical resistance

as the plastic liner.

j. Plastic lined pipe can be fieldinstalled faster than metal pipewith crews that are properly

trained.

6 Disadvantage a. Not Resistant to Ozoneb. Low Resistance to high

temperature.

c. Low Resistance to mechanicalsforce (impact, cutting etc)

d. Limited resistance to organicchemicals (organic solvent)

e. Oils and liquids of many typescause softening and deterioration

of the rubber.

f. Production time is longer thanPTFE Lining.

g. Shorter life time than PTFE

a. Low Resistance to mechanicalsforce (impact, cutting etc)

b. Limited resistance to organicchemicals (organic solvent)

c. Tensile forces stretch thematrix more than the fibres,

causing the material to shear at

the interface between matrix

and fibres.

d. Tensile forces near the end ofthe fibres exceed the tolerancesof the matrix, separating the

fibres from the matrix.e. Tensile forces can also exceed

the tolerances of the fibres

causing the fibres themselves to

fracture leading to material

failure.

f. higher raw material cost.g.

lower elastic modules (exceptsome Carbon FRPs).

h. Glass FRP reinforcementsuffers from stress corrosion.

i. lack of ductility.j. FRP Composite are typically

brittle materials.

k. The coefficient of thermalexpansion is different in the

transverse direction compared

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to the longitudinal one. This

may cause longitudinal splitting

in concrete at high temperature.

l. It is difficult to control thequality of the adhesive layer or

the presence of the entrappedair than can affect the bond

between FRP plate and theconcrete surface.

7 Maintenance Trained person is required Trained person is required A system that sees mostly ambient

temperature may required littlemaintenance, such as a periodic spot

check of bolt torque.

8 Price Low Moderate High