Industrial Elastomer Coatings

Industrial Elastomer Coatings

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Trelleborg Singapore

Rubber Coatings – a safeguard against corrosions and abrasionRubber is chemically resistant to most corrosive liquids, hydrocarbon, gases, salt water, ozone and UV light, commonly met the requirement within Industry, Shipping and Offshore. Where steel is exposed to corrosion, it can be protected by rubber lining, which is also more cost effective due to its simplicity and robustness.

Because of its elasticity and strength, rubber can withstand wears extremely well. It provides excellent protection for steel and other materials against sharp and abrasive particles, both when such particles are in the form of solids and when they are in suspension.

Water treatment tanks

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What can be coated with rubber?

Steel is the structural material most lined with rubber, but new methods of adhesion make it possible to coat other materials, too. Nonmetals such as concrete and certain plastics, may also be rubber lined. If successful results are to be achieved, the bond between rubber and material must be a good one. This is achieved by chemical bonding and vulcanizing.

Examples of constructions we have coated:

For general industry:• Tanksandtowers• Vatsandothervessels• Fansandpumps• Pipesandfittings• Stirringmachinery• Componentsexposed to abrasion

For offshore industry:• Ballastwatertanks• Deaerator-tanks• Salt-waterspools• J-tubes• Riserpipes• Platformlegs

It is preferable to have the lining done at our premises in Singapore, where special facilities are available and vulcanizingcanbedoneinourautoclaves.Closedtankscanalsobeusedastheirownautoclaves.

However, large constructions which are too big to be vulcanized in our autoclaves can be lined and cured at site. Special qualities of rubber have been developed for this purpose and a low-temp curing process is widely used.

Wastewaterfiltertank

Gas scrubber Fire water pump casing

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Type of coatings and their propertiesHard Rubber

Hard rubber (Ebonite) has a density of approx. 1.3 g/cm3.Itstemperatureresistancerangesfrom-10ºto+90ºC.The thermal conductivity (K-value) is approx. 0.2 W/mºK and its thermal insulation capacity is exceptionally good. The dielectric constant of hard rubber is approx. 1012 Ohm.cm and its electrical isolation properties are also excellent.Itscóefficientofexpansionisapprox.7.10-5(about7timesthatofsteel).Hardrubberisusuallymoreresistant to chemicals corrosive substances than are other types of rubber. It is highly resistant to both acids and alkalines and to their salts; it is also resistant to chlorine and chlorine solutions and to a lesser extent, grease, oil and certain solvents.

Natural Rubber

Soft natural rubber is mostly used where abrasion alone or abrasion combined with corrosion is a problem. Its chemical resistance is not quite on par with that of hard rubber, but natural rubber retains its softness in temperaturesaslowas-50ºC.Becauseofitssomewhatlimitedresistancetooxidation,softnaturalrubberisgenerallynotusedwheretemperaturesinexcessof+80ºCarelikelytobeencountered.

Chloroprene (Neoprene)

This rubber is more weather and oxidation resistant than soft rubber and will stand operating temperatures of -30ºCto+95ºC.Itsresistancetoabrasionisalmostasgoodasthatofsoftnaturalrubber,butitismorepronetohyfrolysisinhumidenvironments.Chloroprenerubberishighlyresistanttooilandmaybeusedwithadvantageingaspurificationplants.Alowtemp.vulcanizingqualityforuseatthecustomerssitehasbeendeveloped.

Nitrile Rubber

The great advantage of this type of rubber is that it is petrol and oil resistant. Its mechanical and thermal properties areaboutthesameasthoseofsoftnaturalrubber.Approx.temp.range-30ºCto+90ºC.

Butyl Rubber

This is a rubber with excellent resistance to oxidizing chemicals. It can stand sulphuric acid of up to 80 percent by weightandcanbeusedintemperaturesrangingfrom-50ºCto+100ºC.

Hypalon (chorosulphonated polyethylene)

The properties of this rubber are about the same as those of butyl rubber, but its resistance to oxidizing chemicals isbetter.Approx.temp.range-40ºCto+110ºC.

E.P.D.M. Rubber

E.P.D.M.rubberisveryhightemp.resistantrubberandcanotherwisebecomparedtochloroprenerubberasregardstoproperties.Approx.temp.range-30ºCto+120ºC.

Rubber coated tank

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Choosing a coatingChoiceoftypeisdeterminedbythefollowingfactors:• Exposuretochemicals• Abrasion• Operatingtemperature• Cost

The principal rule is that if rubber is exposed to corrosive chemicals, it should be hard and if abrasion is the problemitshouldbesoft.Generally,a4mmthickliningissufficienttoprovideresistancetocorrosivechemicals,where a thicker lining is often employed if abrasive substances are likely to be encountered. For offshore, NeopreneandE.P.D.M.areusedextensively.

Sea water injection

Offshore oily water separator

Platform legs corrosion protection, antifouling

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Some fields of applicationGas cleaning

• Thegasscrubbersinwasteincineratingplantsare lined with acid resistant rubber for corrosion protection against the hot gas/water mix.

• Gasscrubbersincoalandoilpoweredplantsmustbe corrosion protected with special rubber lining to resist the hot acidic gas.

• Inorderthatthesetypesofenvironmentimprovements shall function perfectly for many years (20-50 years). Trelleborg Singapore rubber linings and coatings are used for corrosion protection.

Water purification

• Wastewatercontaininga.o.dioxinesfromchemicalplantsispurifiedinlargerubberlinedfiltertankswithactive carbon.

• Largestoragetanksforwasteacid(H2SO

4) are lined

with special rubber. Rubber is the only material that will resist the corrosion from these very strong waste acids.

– Power plants Pipes for cooling units Condensors

– Chlorine plants Chlorinecellsandcovers Brine pipelines Vessels for akalines Pumps Anolytictanks Valves Mercuryextractors Kellyfilters

– Metallurgical industry Reaction tanks Storage tanks Anolytetanks Pipesandfittings Screw conveyors Impellers Valves Fans Precipitation tanks Coolingtowers

– Sulphuric acid plants Pipesandfittings Vats Pumps Transport tanks Gas cleaning

– Water purification Ion-exchange vessels Pipesandfittings Acidandalkalitanks

– Smelting plants Slipping devices Valves Fans Pipesandfittings Chlorineandabsorptiontowers Leachingplants

– Galvanizing plants Etching vessels Nickel and chrome baths Acidvessels Washing vessels

– Mines Pumps Pipesandfittings Ore-dressing plants Impellers Magneticseparators Tanks Vats Fans Screening drums

– Synthetic fibre plants Anolytetanks Pipesandfittings Pumps Reaction vessels Tanks Filter containers Spinning-bathfittings

– Ventilation plants Fans Pipesandfittings Gas cleaning units

– Magnesium/Aluminium industry

Pipesandfittings Tanks Mixingplants Reaction vessels Fans Gas cleaning units

– Transport tanks Road transport tanks Railway transport tanks Marinetransporttanks

– Offshore industry Acidstoragetanks Acidtransporttanks Risers Riser clamps Saltwater spools Oil coolers Deaeratortanks J-tubes Stilling tubes Ballast water tanks Insulation spools Fire-water spools Strainer baskets Antifouling Fire protection Manifolds ESD-valves

– Shipping industry Tanks Pipesandfittings Gas scrubbers Condensors

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Scrubber, waste incineration

Oily water separator

Rubber coated chimney

Riser pipe

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Chemical resistance of rubber

A = High resistance B =Limitedresistance U = No resistance RT = Room temperature

Medium Cons %Temp.

ºCHard

rubber

Soft natural rubber

Nitrile rubber

Neoprene rubber

Butyl rubber

Hypalon rubber

Acetaldehyde RT B U U U A/B UAceticacid 10 50 A B B/U B/U A/B B

30 50 A U U U B UConc. RT A B U U B B

Acetone RT B B U B A BAlcohols(Metyl,Etyl-alcohol) 50 A A B A/B A BAmmonialiquid 80 A B B/U B/U B B/UAmmoniumhydroxide 25 RT A A U A A ABenzene RT U U B/U U U UCarbontetrachloride RT U U U U U UChlorinedioxide 50 B U U U B/U BChlorinegas,dry 80 A B/U U B/U B/U BChlorinegas,wet 80 A/B U U U U BChlorinesolutions(bleaches) FreeChlorine

0.1 g/l 80 A A A A A A0.1-1 g/l 80 A A/B B A/B A/B A/B1-10 g/l 80 A B B B B BSaturated 50 B U U U U B/U80 80 U U U U U U

Chlorbenzene RT U U B/U U U UChromicacid 5 50 A/B U U U A/B A/B

10 50 B/U U U U B A/B30 50 U U U U U A/B50 50 U U U U U B

Diethylether RT U U U B/U U B/U(Dibutyl-)dioctylphthalate RT A U B U B UFats, aliphatic and animal 80 B U A B U BFluosilicic acid 50 A A/B B B A AFormaldehyde RT A B B/U B A BFormic acid 85 RT A B/U B/U B A BGlycerine 50 A A/B A A A AHydrochloric acid 10 RT A B A A A A

10 80 A B/U B/U U B AConc. RT A B U B B AConc. 80 A U U U U/A B

Hydrochloric acid/water, alternating 80 A U U U A UHydrofluoricacid 50 RT B B U A A/B A

50 50 A/B U U B/U B AHydrogen peroxide 3 RT A A/B A/B A A A

10 RT A B/U B/U B A A10 50 B/U U U U B A/B

Isopropyl alcohol A A/B A A A AMethylacetate RT B U B U B UMethylenechloride RT U U U U U UMethylethylketone RT B U U U A U

50 B U U U A/B U

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Medium Cons %Temp.

ºCHard

rubber

Soft natural rubber

Nitrile rubber

Neoprene rubber

Butyl rubber

Hypalon rubber

Monochloroaceticacid 80 RT A/B U U B/U B A/BNitric acid 5 RT A B/U B/U B A A

5 50 B U U U A A10 RT A/B U U U A A10 50 U U U U B B40 50 U U U B B B

Nitrous gases 50 RT U U U U B BOils, aliphatic and animal 50 A/B U A B B/U BOils, minerals RT A/B U A A/B U BOxalic acid 30 50 A A B B A BPetrol RT A/B U A U U B/UPhenol 90 50 B/U U U U A B/UPhosphoric acid 85 80 A A/B B/U A/B A BPotassium hydroxide 5 50 A A A A A A

5 80 A A/B B/U A/B A B70 50 A A B A A A70 80 A A/B U A A A

Salt solutions Saturated 80 A A/B A A A A(not chromates, bichromates and permanganates)Sodium hydroxide 5 50 A A A A/B A A

5 80 A A/B B/U B B B70 50 A A/B B A A A70 80 A A/B U A A A

Sodium hypochlorite 10 g/l active chlorine80 B B U B A/B A

100 g/l active chlorine80 U U U B/U B B

160 g/l active chlorine30 A/B U U B/U A/B B

Steam 100 A/B B B B A BSulphur dioxide (gas) dry and wet

20 vol 50 A U B/U B A BSulphuric acid 20 weight 80 A/B A/B U B A A

50 weight 80 A/B B U B A A70weight RT A B/U U B A A70weight 50 A/B U U U A A80 weight 50 B/U U U U B A/B96 weight 50 U U U U U U

Sulphurous acid 5 RT A A/B B/U B/U A ASulphur trioxide (gas) 50 U U U U U UToulene RT U U U U U UTrichloroethylene RT U U U U U UTurpentine RT B U A/B U U UWater 80 A B B U B B

A = High resistance B =Limitedresistance U = No resistance RT = Room temperature

This table is intended as a rough guide only. If in doubt, please consult us.

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Lining at the customers’ siteDoingthejobatthecustomers’sitemustbedonewhen:

1) The construction is too large or too heavy for our factory equipment.2) The construction is too large for transport on land and sea.3) Rubbercoateditemsarejointweldedatthecustomers’siteandthefieldjointsmustbecoated.4) Repairs to damaged coating.

Whentheliningorcoatingworkmustbedoneatthecustomers’site,certainnecessarymeasuresmustbearranged by the customer.

For instance adequate place for the work and work containers, ventilation, access to electric power, compressed air, housing for people and similar practicable measures.

These matters are agreed upon prior to start of work.

Field joining of rubber coated pipes

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Dimension of piping

The max. possible size for dimension of piping for rubber lining

A1

A2

R1

E1

90o Long Elbow 45o Long Elbow

Tee

Straight pipe with branchReducer

L1 L2L4

BB

B

B

E2 L3

SizeLong Elbow

TeeReducer Straight pipe with

branch90o 45o (1) (2)

(B) (A) A1 E1 A2 E2 B L3 L1 L2 B L4

1B B 25 A 90 300 90 300 80 2,000 - 2,000 - -

11/4 B 32 A 95 300 95 300 85 2,000 120 2,000 - -

1 1/2 B 40 A 100 300 100 300 90 2,000 120 2,000 - -

2 B 50 A 115 500 115 500 100 5,500 130 5,500 - -

2 1/2 B 65 A 130 500 130 500 115 5,500 150 5,500 - -

3 B 80 A 150 1,000 150 1,000 125 5,500 150 5,500 - -

3 1/2 B 90 A 170 1,500 170 1,500 135 5,500 160 5,500 - -

4 B 100 A 190 1,500 190 1,500 145 5,500 160 5,500 145 1,000

5 B 125 A 195 3,000 195 3,000 165 5,500 200 5,500 165 1,000

6 B 150 A 230 3,000 230 3,000 1990 5,500 220 5,500 190 1,000

8 B 200 A 310 3,000 310 3,000 225 5,500 230 5,500 225 1,500

10 B 250 A 385 3,000 385 3,000 270 5,500 250 5,500 270 1,500

12 B 300 A 465 3,000 465 3000 310 5,500 300 5,500 310 1,500

14 B 350 A 540 3,000 540 3000 340 5,500 480 5,500 340 1,500

16 B 400 A 615 3,000 615 3,000 370 5,500 500 5,500 370 1,500

18 B 450 A 695 1,000 695 3,000 410 5,500 530 5,500 410 1,500

20 B 500 A 770 1,000 770 3,000 450 5,500 650 5,500 450 1,500

22 B 550 A 845 5,500 800 5,500 490 5,500 650 5,500 490 1,500

24 B 600 A 920 5,500 900 5,500 500 9,000 650 9,000 500 5,500

26 B 650 A 1,000 5,500 1,000 5,500 565 9,000 (900) 9,000 565 9,000

28 B 700 A 1,075 9,000 1,000 9,000 570 9,000 (900) 9,000 570 9,000

30 B 750 A 1,150 9,000 1,100 9,000 625 9,000 (900) 9,000 625 9,000

32 B 800 A 1,225 9,000 1,200 9,000 640 9,000 900 9,000 640 9,000

34 B 850 A 1,300 9,000 1,300 9,000 700 9,000 900 9,000 700 9,000

36 B 900 A 1,380 9,000 1,400 9,000 740 9,000 900 9,000 740 9,000

38 B 950 A 1,455 9,000 1,400 9,000 780 9,000 900 9,000 780 9,000

40 B 1000 A 1,530 9,000 1,500 9,000 820 9,000 900 9,000 820 9,000

Certificate No. 190037

Certificate No. 403030

TE

S-lr

l01

Trelleborg Singapore Pte Ltd4 Jalan Pesawat, Singapore 619362

Tel: +65 6265 0955 Fax: +65 6265 9853Email: [email protected]

www.trelleborg.com/herculeswww.trelleborg.com

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Industrial Elastomer Coatings