• Many Glacier Hotel at Glacier National Park, Montana

    DSC Workflows

Mechanical QA Checklist

Predesign

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All required deliverables submitted.
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Consistent with DSC Mechanical Design Standards.
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Design narrative includes descriptions of all proposed mechanical systems (HVAC, plumbing, fire protection, fuel systems, etc.).
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Class C mechanical systems cost estimate accurate and correct.

Schematic Design

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All required deliverables submitted.
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Consistent with DSC Mechanical Design Standards.
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Mechanical system(s) appropriate for the structure.
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Energy analysis and life cycle analysis for mechanical systems selection accurate and correct.
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Design narrative includes descriptions of all proposed mechanical systems (HVAC, plumbing, fire protection, fuel systems, etc.).
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Mechanical equipment locations thoroughly coordinated with architectural and structural.
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Main ductwork and piping runs thoroughly coordinated with architectural and structural.
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Class B mechanical systems cost estimate accurate and correct.

Design Development (DBB or DB)

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All required deliverables submitted.
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Consistent with DSC Mechanical Design Standards.
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Outline specifications for all proposed mechanical systems.
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Heating and cooling load calculations accurate and correct.
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Plumbing design calculations accurate and correct.
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Fire protection design calculations accurate and correct.
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Revised Class B mechanical systems cost estimate accurate and correct.

100% Draft Construction Documents (DBB) or 100% Draft Design-Build Construction Documents (DB)

General

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All required deliverables submitted.
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Consistent with DSC Mechanical Design Standards.
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All required specification sections provided.
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Equipment and materials conform to NPS standards.
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Housekeeping pads provided for all large floor-mounted equipment.
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Adequate access space for equipment servicing and adequate pull space for filters, tube bundles, motors, etc. provided.
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Catwalks, walkways, mezzanines, etc. provided for access to equipment.
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Access doors provided as necessary for valves, equipment, trap primers, water hammer arresters, etc.
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Access door locations coordinated with architectural.
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Louvers, vents, hoods, etc. on exterior of building coordinated with architectural.
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Louver blank-offs coordinated with architectural.
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All necessary isolation valves shown.
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All low point drain valves shown.
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UL approved closure systems where piping penetrates fire rated assemblies.
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Seismic restraints for tank type water heaters, hot water storage tanks, expansion tanks, equipment, piping, etc. in seismically active areas.
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All mechanical systems power requirements thoroughly coordinated with electrical.
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Specifications thoroughly coordinated with drawings.
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Class A mechanical systems cost estimate accurate and correct.

HVAC

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HVAC systems designed to conform to all applicable codes and standards.
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Combustion air provided for fuel-burning appliances.
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Proper clearances to combustibles provided for fuel-burning appliances.
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Proper venting provided for fuel-burning appliances.
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Ventilation air provided per ASHRAE 62.
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Restroom ventilation systems provided (unless operable windows or other passive systems can provide required ventilation function).
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Ductwork and damper arrangements for air side systems correct.
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Ductwork sized correctly.
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Fire dampers where ductwork penetrates fire rated assemblies.
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Combination smoke and fire dampers shown where necessary and coordinated with electrical.
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Duct smoke detector locations shown and coordinated with electrical.
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All necessary air vents shown in hydronic systems.
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All balancing valve locations shown in hydronic systems.
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Proper air control and system pressurization shown for hydronic systems.
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Anti-freeze and anti-freeze makeup systems provided for hydronic systems that have a high probability of freezing or will be seasonally operated.
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Adequate pressure rating for boilers.
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Pressure setting for pressure relief valves correct.
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Piping and pumping arrangements for hydronic systems correct.
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Primary/secondary pumping arrangements provided for multiple boiler installations.
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Properly sized diaphragm type expansion (compression) tanks for hydronic systems.
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Chemical feeders (pot type) provided for hydronic systems.
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Sound attenuation measures provided where necessary.
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Adequate vibration isolation provided for pumps, fans, and other rotating or vibration producing equipment.
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Condensate drains with vented traps shown for all cooling coil condensate drain pans.
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All control device locations shown (thermostats, switches, sensors, actuators, control panels, etc.).
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Control system diagrams coordinated with what is shown on the plans.
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Control system points list accurate and correct (DDC systems).
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Control systems sequence coordinated with what is shown on the plans and what is shown on the control systems diagrams and points list.
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Control systems logic coordinated, correct, and unambiguous.

Plumbing

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Plumbing systems designed to conform to all applicable codes and standards.
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Building domestic water and sewer services coordinated with civil utility plan.
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Pressure reducing valve(s) installed if water supply pressure ≥ 80 psi.
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Booster pump(s) provided as necessary to maintain a minimum of 25 psig at the furthest plumbing fixture at design flowrate conditions.
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Water meters on domestic water services of each building.
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All fixtures properly trapped and vented.
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All necessary cleanouts shown.
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Trap primers or "trap guards" provided for infrequently used floor drains.
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Low-flow fixtures and fittings specified.
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Sump pumps and sewage ejectors where necessary.
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Combustion air provided for fuel-burning domestic water heaters.
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Proper clearances to combustibles provided for fuel-burning domestic water heaters.
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Proper venting provided for fuel-burning domestic water heaters.
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Domestic hot water expansion tank (if pressure reducing valves or check valves are installed on the domestic water service).
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Double-wall heat exchangers with leakage path open to atmosphere for indirect-fired domestic water heaters.
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Proper discharge routing and termination for domestic water heater temperature and pressure relief valves.
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Cross connection control (vacuum breakers on all hose connections, backflow preventers on hydronic system makeup water connections, irrigation system connections, etc.).
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Airgap fittings with outlets routed to floor drain or sink for all reduced pressure zone backflow preventers installed indoors.
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Water hammer arresters provided for domestic water systems with quick-closing valves.
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Exterior wall hydrants or hose bibbs.
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Hose bibbs in public restrooms.
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Hose bibbs in mechanical spaces.
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Domestic water piping sized correctly.
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Drain, waste, and vent (DWV) piping sized correctly.
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Oil/water separators for floor drains in automotive repair facilities.
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Secondary (overflow) roof drains or scuppers provided (if roof drains are used).
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Earthquake shutoff valves in fuel gas services in seismically active areas.
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Gas meters provided in building fuel gas services (except where a single building is served by a single LP-gas tank).
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Primary-secondary pressure regulation on LP-gas vapor services.

Fire Protection

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Fire protection systems designed to conform to all applicable codes and standards.
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Proper hazard classification(s) used.
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Building fire protection water service coordinated with civil utility plan.
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Fire department connection and inspector's test valve locations shown.
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Risers and floor control valve stations locations shown where necessary.
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Locations of fire pumps and fire pump controllers shown where necessary.
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Locations of pressure tanks, air compressors, nitrogen bottles, etc. shown where necessary.
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Locations of standpipes and hose valves shown where necessary.
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Locations of sprinklers coordinated with architectural reflected ceiling plans.
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Double check valve assembly provided on fire protection water service.
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Tamper switches for supervised valves coordinated with electrical.
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Flow switches for sprinkler activation alarm(s) coordinated with electrical.
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Piping and valving arrangements correct for fire protection systems.
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Supervised control valves provided in branch lines feeding elevator machine room, elevator hoistway, computer network room, and telecommunications equipment room sprinklers.
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High/low air pressure switches provided in dry pipe valve trim, connected to fire alarm panel.
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Tamper switches on alarm silence valves provided in wet pipe alarm check valve trim and dry pipe valve trim, connected to fire alarm panel.
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Provision made for flow testing of backflow prevention device at design flow conditions (bypass around fire department connection check valve with supervised shutoff valve).

Fuel Systems

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Fuel systems designed to conform to all applicable codes and standards.
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Proper clearances provided between fuel storage tanks, buildings, ignition sources, and public ways.
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Vehicular impact protection for aboveground fuel storage tanks.
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Fire resistant (protected) fuel storage tanks specified for aboveground liquid fuel storage.
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Overfill spill containers, overfill protection, secondary containment, fire resistant construction, continuous leak detection monitoring, tank level monitoring (inventory control), normal vents, emergency vents, vapor recovery, anti-siphon measures, etc. provided as necessary for liquid fuel storage.
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Emergency shutdown switch provided for gasoline dispensing facilities.
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Shear valves provided for vehicular fuel dispensers.
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Containment sumps provided for vehicular fuel dispensers.
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Vapor recovery provided for vehicular fuel dispensers as necessary.
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Secondary containment with continuous leak detection monitoring for pressurized underground fuel piping.
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Line leak detection system provided for pressurized fuel piping.
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Excess flow valves, emergency shutoff valves, etc. provided for LP-gas fuel storage.
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Adequate ballast and hold-downs for underground fuel storage tanks in high groundwater areas.
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Adequate corrosion resistance or corrosion protection for underground fuel storage tanks.
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Proper piping materials and piping corrosion protection to suit the particular fuel system application.

100% Complete Construction Documents (DBB) or 100% Complete Design-Build Construction Documents (DB)

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All required deliverables submitted.
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All review comments from 100% Draft Review satisfactorily resolved.