Working inventory
Add piping and equipment hold-up, return delay, minimum suction conditions and the chosen reserve. Nominal tank volume and usable working inventory are not interchangeable.
Supply pump duty
Record the required flow together with the complete pressure loss, elevation and equipment restrictions. Pipe liquid volume does not identify a pump operating point.
Return capacity
Check the lowest pickup, collection arrangement, air entrainment and return delay. Supply delivery must be matched by reliable removal from the equipment.
Heating demand
Review the starting conditions, required heating envelope, circulation arrangement and available utilities. Confirm how much heat is required during preparation and during circulation.
Concurrency and margins
Document the actual simultaneous operating cases and planned expansion. Do not apply an unexplained capacity multiplier instead of identifying the limiting duty.
