Rubber Linings And Coatings Of Pipe System

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Rubber Linings And Coatings Of Pipe Are Mainly Used For Protection Against Corrosion And/Or Erosion Damage.
A Wide Range Of Rubbers And Elastomers Are Available For Lining Vessels, Tanks And Piping.
Rubbers Can Also Be Made With Anti-Static Properties To Give A Low Surface Electrical Resistance.
Hard Rubbers, I.E. Hardness Greater Than Shore D 60, Can Only Be Applied By Autoclave Vulcanization, And Therefore Hard Rubber Lining Is Restricted To Small Equipment Or Components. Only Soft Rubbers Can Be Applied On Site.
Hard Rubber Linings Can Only Be Applied To Rigid Structures And They Are Also Sensitive To Large Temperature Fluctuations. Soft Rubber Linings Remain Elastic Over A Large Temperature Range, And Consequently They Can Accommodate Major Deformation, Vibrations And Significant Temperature Changes.
With Respect To Safety Aspects, Pressure Rating, Etc. The Regulations Which Apply To Piping, Equipment And Structures Are Also Valid For Rubber-Lined Systems.
Material Selection
Material Selection Is Determined By:
– Service Conditions (Pressure, Temperature, Medium, Etc.)
– Design
– Manufacturing Method
The Following Rubber Types Are Used For Lining Purposes (Classification According To Astm D 1418):
– Isoprene Or Natural Rubber (NR)
– Synthetic Isoprene Rubber (IR)
– Styrene-Butadiene Rubber (SBR)
– Chloroprene Rubber (CR)
– Butyl Rubber (IIR)
– Broom-Butyl Rubber (BIIR)
– Chloro-Butyl Rubber (CIIR)
– Nitrile-Butadiene Rubber (NBR)
– Ethylene Propylene Rubber (EP, EPDM)
– Urethane Rubber (UR)
– Chlorosulphonated Polyethylene (CSM)
– Fluoro Elastomer (FKM)
Commercially Available Under Trade Name “Viton” (Dupont Product)
Commercially Available Under Trade Name “Hypalon” (Dupont Product)
Depending On The Degree Of Vulcanization, Rubbers Can Be Classified As ‘Soft’ Rubber Or As ‘Hard’ Rubber. The Hardness Of Soft Rubbers Is Expressed In Shore A, And The Hardness Of Hard Rubbers Is Expressed In Shore D (Astm D 2240).

Hard Rubbers (Or Ebonites), I.E. With A Hardness Higher Than Shore D 60, Can Be Produced From Nr Or Blends, E.G. Nr/Ir, Nr/Sbr And Nr/Ir/Sbr.