as you know the vertical compressor have a limitation about the compressor length and obviously for geometry this limitation have direct impact on cylinder dimension (diameter).
For this kind of application , that is absolutely in compliance with our experience and compressor skills, the problem is the required capacity with this low suction pressure . For meet the customer requirements we should have in our range of production cylinders 3 times larger respect to our max dimension .
So in conclusion, in order to manage the total required capacity with vertical compressors, we should consider No. 3 compressors in parallel with the arrangement showed in pi&d with mark-up.
Please let us know if our philosophy could be accepted from the customer and if yes, we will go ahead with compressor proposal and quotation.