what is the Max. Nitrogen gas pressure in accumulator for vertical roller mill - hydraulic cylinder

Hi,

I would like to know " what is the max. nitrogen gas pressure in Hydraulic Accumulator for Vertical roller mill - hydraulic cylinder.

Max. Grinding pressure( Hydraulic): 190 bar , as standard formula that nitrogen gas pressure  = 0.75 times of Hydraulic pressure , i.e means nitrogen ras pressure is equal to 140 bar, is it advisable to use this range of pressure in VRM's...?

kindly clarify...

regards,

dhanu

Reply

Know the answer to this question? Join the community and register for a free guest account to post a reply.

Re: what is the Max. Nitrogen gas pressure in accumulator for vertical roller mill - hydraulic cylinder

In our Loesche Mill we are keeping nitrogen pressure is 70% of  average operating grinding pressure.

Reply

Re: what is the Max. Nitrogen gas pressure in accumulator for vertical roller mill - hydraulic cylinder

Dear dhanu.

Max N2 press in accumulators is derived according to manufacturer's allowance.

Accrding to  Gebr. Pfeiffer,  we have formula as follows

Max N2 P = 0.66 Grind P

Min N2 P= 0.33 Grind P

Opt N2 P = 0.50 Grind P

So i m sure about this but if your mill is other than  Gebr. Pfeiffer  then u must first contact manuacturer before making any change. These limits can also be seen in manuals supplied by respective company. Make sure not to exceed design limits.

Thanx. Have a nice day

EngrS

Reply

Re: what is the Max. Nitrogen gas pressure in accumulator for vertical roller mill - hydraulic cylinder

@ENGRs         sir if we exceed or keep low this nitrogen pressure in accumulator then wat will hapend. we have loesche mill capacity 490t/h and our nitrogen pressure is about 40bar normally we operate mill with grinding pressure upto 96bar

Reply