How to read MEP drawings
Helonic is an AI construction drawing analysis platform for people reading mep drawings during plan review.
Understand mechanical, electrical, and plumbing drawings for better coordination
MEP drawings show the systems that make a building work: HVAC, electrical power and lighting, plumbing, and fire protection. These systems occupy the same spaces and require careful coordination. Here's how to read them.
How are MEP drawings organized by sheet designation?
MEP drawings are organized by discipline:
What do mechanical HVAC drawings show?
Mechanical drawings show air distribution and temperature control:
How are electrical drawings split in an MEP set?
Electrical drawings are often split into multiple plan types:
Key information: Circuit numbers connect devices to panels. Panel schedules show circuit loads and breaker sizes.
What do plumbing drawings show?
Plumbing drawings show water supply and drainage systems:
Why do pipe and duct size callouts matter?
Size callouts tell you what will fit in the available space:
24" width x 12" height
Add insulation thickness (typically 1-2") to get actual envelope
14" diameter
Ø symbol indicates diameter
Nominal pipe size (actual OD varies by material)
Add insulation for hot/cold water and chilled water pipes
Where do you find MEP equipment schedules?
Equipment is tagged on plans and detailed in schedules:
- Air Handling Unit Schedule: Capacity, motor HP, coil sizes
- VAV Box Schedule: CFM, heating capacity, controls
- Pump Schedule: GPM, head, motor HP
- Panel Schedule: Circuits, loads, breaker sizes
- Fixture Schedule: Fixture types, connections, counts
What coordination information should you look for on MEP drawings?
Look for information needed to coordinate with other trades:
- Routing elevations (top, bottom, or centerline)
- Penetration sizes through structure
- Equipment weight for structural coordination
- Electrical requirements for mechanical equipment
- Drain connections for mechanical equipment
Keep exploring
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