MEP PE Stamp in Phoenix, AZ — Extreme-Heat Mechanical, Electrical & Plumbing

My Phoenix mechanical review starts with the load calculation inputs and works outward. I confirm the outdoor design temperatures used are genuine Phoenix values, check envelope assumptions against the architectural set, and verify internal loads — people, lighting, equipment — for the actual occupancy. Then the equipment: I compare the scheduled units' capacity tables at design conditions against the calculated block and zone loads, checking both sensible and total capacity. Ventilation rates, exhaust systems, and make-up air follow, with kitchen and specialty exhaust verified against the occupancy. Anything the load calc assumes — shading, envelope performance, operating schedules — has to match what is drawn and scheduled. The seal goes on a system I believe will hold setpoint in August, not one that looks fine on a mild-day calculation.

Electrical review in Phoenix is inseparable from mechanical: the cooling equipment dominates the service calculation, so I reconcile every motor load on the one-line against the mechanical equipment schedule before anything else. Then distribution — panel schedules, feeder sizing, voltage drop on long runs common in sprawling Valley buildings — and lighting design against the energy code. Plumbing review covers fixture counts and layouts, water distribution sizing, sanitary drainage, and water heating, plus the water conservation provisions Phoenix enforces. Storm drainage gets real attention: monsoon rainfall on hard desert soils produces intense runoff, so roof drainage and site coordination must handle cloudburst intensity, not average rainfall. The three disciplines get a final cross-check for consistency before I seal.

I confirm these before the Arizona PE seal goes on a Phoenix MEP set. Each one maps to something SHAPE PHX reviewers check. • Arizona PE license verified; responsible charge under AZ R4-30 • Cooling loads calculated at genuine Phoenix design temperatures • Equipment capacity verified at design conditions, not rating conditions • Ventilation, exhaust, and make-up air designed for the occupancy; dust considered • Electrical service and distribution reconciled to mechanical equipment schedules • Plumbing sized and coordinated; water conservation provisions addressed • Energy code compliance path explicit with matching documentation • Rooftop equipment coordinated with structural for weight and wind anchorage