Thank you everyone for your replies. I now understand the need for additional controls at Pump 2.
Our current plan is to add a PI at Pump 2 suction linked to a safety interlock that will trip Pump 1 at low suction pressure. As for the HX performance, the MAWP is more than 2x the max shutoff...
I have an existing pump for naphtha service (aka Pump 2) with the following specs:
Suction P: 80.2 kPag rated, 86 kPag actual, 399.9 kPag max per spec sheet
Capacity: 178 m3/h rated
Diff head: 1164 kPa
Suction elevation: 0.78 m
The pump has a minimum flow spillback line controlled by an FIC...
