I have taken into account all 7 PCH blocks but difference is I have taken 1 MS per 1 CCCH block and 100% load.
If I take 2 MS per CCCH block at 60 % load,
PPS = (30*2)*0.6 = 36
While for 3 MS per CCCH block it would be around 54.
In our network we are using mixture of Paging request type 1 and 3.