I purchased an old reciprocating gas compressor (Joy make, WB12 series), twin cylinder (not 2 stage), v-arrangement, double acting, stroke-7 inch, diameter-5.5 inch, rpm-475, inlet temp-30 deg.c, inlet pressure- 6 bar, discharge pressure-35 bar, discharge temp-45 deg.c, medium- lean gas, lubricated cylinder.
1) Can anybody help to find the capacity of this compressor in nm3/min?
2) The suction pressure of gas at 1st location was 15 bar and now it will be 6 bar, what will be the difference in operating conditions of this compressor?

Use the formula to calculate the capacity.