FEMA E-74 Appendix E. Mechanical, Electrical, & Plumbing Seismic Risk Ratings

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Appendix E. Mechanical, Electrical, and Plumbing (MEP) Seismic Risk Ratings

Item No./
Subcategory
Example No.Component
Name(s)
Shaking
Intensity
Life
Safety
(LS)
Property
Loss
(PL)
Functional
Loss
(FL)
Type
of
Detail
6.4.1 Mechanical Equipment6.4.1.1Boilers, Furnaces, Pumps, and Chillers (HVAC wet-side)LowLLLER
ModLLL
HighMMH
NABoilers and Furnaces (rigid mount)LowLLL 
ModLLL
HighMMM
NAChillersLowLLL 
ModLLL
HighLMH
NAHeat Pumps or Heat ExchangersLowLLL 
ModLLL
HighLMM
6.4.1.2General Manufacturing and Process MachineryLowLLLER
ModMMM
HighMHH
6.4.1.3HVAC Equipment With Vibration IsolationLowLLLER
ModLML
HighLMM
NAFans, Blowers, FiltersLowLLL 
ModLML
HighLMM
NAAir CompressorsLowLLL 
ModLML
HighLMM
NARoof Mounted HVAC UnitsLowLML 
ModLML
HighMHM
NARoof Mounted Equipment, Vents or FluesLowLLL 
ModLML
HighMMM
6.4.1.4HVAC Equipment Without Vibration Isolation (rigid mount)LowLLLER
ModLLL
HighLMM
NAWall-Mounted Room Air Conditioning UnitsLowLLL 
ModMML
HighMML
6.4.1.5HVAC Equipment Suspended In-line With DuctworkLowLLLER
ModLML
HighLMM
6.4.1.6Suspended EquipmentLowLLLER
ModHHL
HighHHL
6.4.2 Storage Tanks and Water Heaters6.4.2.1Structurally Supported Tanks and VesselsLowLLLER
ModMHM
HighMHM
NADiesel Fuel TankLowLLL 
ModHHL
HighHHM
NAPropane TankLowLLL 
ModHHM
HighHHM
6.4.2.2Flat Bottom Tanks and VesselsLowLLLER
ModMHM
HighMHM
6.4.2.3Compressed Gas Cylinders (oxygen, CO2, ammonia, etc.)LowLLLNE
ModMML
HighHMM
6.4.2.4Gas Water HeatersLowLLLPR
ModMHL
HighHHL
6.4.3 Pressure Piping6.4.3.1Suspended Pressure PipingLowLLLER
ModMMM
HighMHM
6.4.3.2In-line Valves and PumpsLowLLLER
ModMMM
HighMMM
6.4.3.3Flexible Connections, Expansion Joints and Seismic SeparationsLowLLLER
ModMMM
HighMMM
6.4.3.4Pipe RisersLowLLLER
ModLMM
HighMMM
6.4.3.5Floor-mounted supportsLowLLLER
ModLMM
HighMMM
6.4.3.6Roof-mounted supportsLowLLLER
ModLMM
HighMMM
6.4.3.7Wall-mounted supportsLowLLLER
ModMMM
HighMMM
6.4.4 Fire Protection Piping6.4.4.1Suspended Fire Protection PipingLowLMMER
ModLHH
HighMHH
6.4.4.2In-line Valves and PumpsLowLLL 
ModLLL
HighMML
6.4.4.3Flexible Connections, Expansion Joints and Seismic SeparationsLowLMM 
ModLHH 
HighMHH 
6.4.4.4Pipe RisersLowLMM 
ModLHH
HighMHH
6.4.4.5Pipes Supported from FloorLowLMM 
ModLMH
HighMHH
6.4.5 Fluid Piping, Not Fire Protection6.4.5.1Hazardous MaterialsLowLLLER
ModHHH
HighHHH
NAFuel LineLowLLL 
ModHHL
HighHHM
6.4.5.2Nonhazardous MaterialsLowLLLER
ModMMM
HighMMM
6.4.6 Ductwork6.4.6.1Suspended DuctworkLowLLLER
ModLLL
HighMML
6.4.6.2Air DiffusersLowLLLNE, ER
ModMML
HighMHML
6.4.7 Electrical and Communications Equipment6.4.7.1Control Panels, Motor Control Centers and SwitchgearLowLLLER
ModLLL
HighMMM
6.4.7.2Emergency GeneratorLowLLMER
ModLMH
HighLHH
6.4.7.3TransformersLowLLLER
ModLLL
HighMMM
6.4.7.4Batteries and Battery RacksLowLLLER
ModLHM
HighLHH
6.4.7.5Photovoltaic Power Systems (Solar panels)LowLLLER
ModLLL
HighMML
6.4.7.6Communications AntennaeLowLLLER
ModLML
HighMHM
6.4.8 Electrical and Communications Distribution Equipment6.4.8.1Electrical Raceways, Conduit, and Cable TraysLowLLLER
ModLMM
HighMMM
6.4.8.2Electrical Distribution PanelsLowLLLER
ModLLL
HighMMM
6.4.9 Light Fixtures6.4.9.1RecessedLowLLLPR
ModHLL
HighHMM
6.4.9.2Surface-Mounted LightingLowLLLPR
ModHLL
HighHMM
6.4.9.3Pendant Light FixturesLowLLLNE
ModHLL
HighHMM
6.4.9.4Heavy Light FixturesLowLLLNE
ModHLL
HighHMM
NAExterior LightingLowLLL 
ModMLL
HighMMM
6.4.10 Elevators and Escalators6.4.10.1Hydraulic Elevator (cab and elevator equipment)LowLLLER
ModLMM
HighMMM
6.4.10.2Traction Elevator (elevator cab and shaft doors)LowLLLER
ModLMM
HighMMH
NACables, Counterweights, and Guide Rails (for cable-traction system)LowLLL 
ModHMM
HighHMM
NAElevator Motor and Motor Control CabinetsLowLLL 
ModLMM
HighLHM
6.4.10.3EscalatorLowLLLER
ModMMM
HighHHH
6.4.10.3People Mover (moving walkway)LowLLLER
ModLML
HighLML
6.4.11 Conveyors6.4.11.1ConveyorsLowLLLER
ModLMM
HighMMM

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Last Updated: 
07/24/2014 - 16:00
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