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[a1986]

Dear Sirs,

if we look at P&ID for api plan 53 B, we can notice PI (pressure indication) and relative low pressure alarm..we need low pressure alarm in case of discharging of N2 bladder..
My question for you is: why doesn't high pressure alarm present?
In what way, could i notice mechanical seal failure?

(i think low pressure level is sufficient, because if is present a mechanical seal failure i'm not be able to maintaine a constant pressure level in the bladder)

best regards