RECOMMENDED RUBBER TYPE FOR DEMINERALIZED WATER PIPE

[geliberman]

Hi!
Please let me know what is the recommended rubber type and thickness for rubber lining of demin water pipe (boiler feedwater).
thank you

 

[GrahamBennett]

Depends on the water temperature involved. If it is less than 70 deg C then I would recommend a natural rubber based hose. If more than this then an EPDM or butyl base would be better.

 

[geliberman]

Thank you GrahamBennett,
Maximum operating temperature of demin water is 39 deg C.
We will use hard ruber lining with 4mm thickness. is that Ok?
Thank you

 

[corrosionman]

Hard rubber is ok but so is a good quality natural with hardness 60 -65 Deg. A soft rubber forms its own gasket but hard needs a soft rubber gasket to ensure a leak proof joint. Beware of overtightening hard rubber joints - can crush the lining. Ideally the flanges should be flat faced to lessen chance of crushing. How big are your pipes.
Regards CM

 

[geliberman]

pipes are 10", 12" and 14".
how about ebonite 65 deg shore D.
we use soft gaskets 60 deg shore A.
regards,

 

[GrahamBennett]

NR-based ebonite should be OK.