LSLL - since it has nothing to do with the well, I'd just shut the valve on liquid drainage line, to prevent from gas break through.
PSHH - it seems, that your piping design pressure (PSV set) is below well static pressure? If it's the case, and you have PSHH activated I would not agree to...
Alex,
>2. PSVs on the discharge line. Deemed to be expensive solution.
How is it possible, that PSV is more expensive than ESD/FCV combination? What is more, I can imagine shut off with dual function, but control valve serving as ESD? Not a good pracice, as you know. State of the art would...