r&t 2007 - machinery room design - jekel

7/28/2019 R&T 2007 - Machinery Room Design - Jekel

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Machinery Room DesignMachinery Room DesignRequirements & Best PracticesRequirements & Best Practices

Todd Jekel, Assistant Director, IRC Feb. 8, 2007Todd Jekel, Assistant Director, IRC Feb. 8, 2007

2007 IRC

Standard DefinitionStandard Definition

z What is a machinery room?

zASHRAE 15-2004 3 states:

a space, meeting the requirements of8.11 and 8.12, that is designed tohouse compressors and pressure vessels

z 8.11 refers to 7.4, which refers to 7.2z 7.2.2.7 states:

All refrigerant-containing parts in systems exceeding 100HP (74.6 kW) compressor drive power, exceptevaporators used for refrigeration or dehumidification,condensers used for heating, control and pressure-reliefvalves for either, and connecting piping, are locatedeither in a machinery room or outdoors.


zASHRAE 15-2004 3 states:

a space, meeting the requirements of8.11 and 8.12, that is designed tohouse compressors and pressure vessels

z 8.11 refers to 7.4, which refers to 7.2z 7.2.2.7 states:

All refrigerant-containing parts in systems exceeding 100HP (74.6 kW) compressor drive power, exceptevaporators used for refrigeration or dehumidification,condensers used for heating, control and pressure-reliefvalves for either, and connecting piping, are locatedeither in a machinery room or outdoors.


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2007 IRC

Standard Definition (cont.)Standard Definition (cont.)


z IIAR 2-1999

a space that is designed to safely housecompressors, pressure vessels, or associatedrefrigeration equipment

No further expansion of

definition within the bodyof the standard


z IIAR 2-1999

a space that is designed to safely housecompressors, pressure vessels, or associatedrefrigeration equipment

No further expansion of

definition within the bodyof the standard

2007 IRC

Location & SitingLocation & Siting

z Location

z Ideal

zGround floor with multiple outside walls

z Easy access for emergency response

z Often found realities in older systemszNo outside walls due to facility expansion

z Basement or upper floor location (formerlyallowed)

z Location

z Ideal

zGround floor with multiple outside walls

z Easy access for emergency response

z Often found realities in older systemszNo outside walls due to facility expansion

z Basement or upper floor location (formerlyallowed)


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2007 IRC

EgressEgress

z Egress & Doors

zASHRAE 15

z 8.11.2

ztight-fitting door(s) opening outward, self-closing if theyopen into the building, adequate in number to ensurefreedom for persons to escape in an emergency

z 8.12(b)

z Same as 8.11.2 but says fire doors

z 8.12(d)

zshall have a door that opens directly to the outside airor through a vestibule equipped with self-closing, tight-fitting doors

z IIAR 2 6.3.1.5 (same)

z Egress & Doors

zASHRAE 15

z 8.11.2

ztight-fitting door(s) opening outward, self-closing if theyopen into the building, adequate in number to ensurefreedom for persons to escape in an emergency

z 8.12(b)

z Same as 8.11.2 but says fire doors

z 8.12(d)

zshall have a door that opens directly to the outside airor through a vestibule equipped with self-closing, tight-fitting doors

z IIAR 2 6.3.1.5 (same)

2007 IRC

Standard RequirementsStandard Requirements

zAccesszASHRAE 8.11.8 & IIAR6.1.1.1

z Accessshall be restricted toauthorized personnel. Doors shallbe clearly markedto indicate this

restriction.

z PenetrationszASHRAE 15 8.12(f) & IIAR6.3.1.10

z All pipes piercing the interior walls, ceiling orfloorshall be tightly sealed to the walls,ceiling or floor through which they pass.

zAccesszASHRAE 8.11.8 & IIAR6.1.1.1

z Accessshall be restricted toauthorized personnel. Doors shallbe clearly markedto indicate this

restriction.

z PenetrationszASHRAE 15 8.12(f) & IIAR6.3.1.10

z All pipes piercing the interior walls, ceiling orfloorshall be tightly sealed to the walls,ceiling or floor through which they pass.


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2007 IRC

Standard Reqts (cont.)Standard Reqts (cont.)

z Building materials

zASHRAE 8.12(c)

z Walls, floor, and ceiling shall be tight and ofnon-combustible construction. Walls, floor,and ceiling separating the refrigerationmachinery room from other occupied spacesshall be of at least one-hour fire-resistiveconstruction.

z Building materials

zASHRAE 8.12(c)

z Walls, floor, and ceiling shall be tight and ofnon-combustible construction. Walls, floor,and ceiling separating the refrigerationmachinery room from other occupied spacesshall be of at least one-hour fire-resistiveconstruction.

2007 IRC

VentilationVentilation

z ASHRAE 15 8.11.3-5zvented to the outdoors utilizing mechanical

ventilation

zone or more power-driven fans To obtain

reduced airflow for normal ventilation, multiple ormultispeed fans shall be used. Openings for inletair shall be positioned to avoid recirculation. Airsupply & exhaust ductsshall serve no otherarea. The discharge of air shall be to theoutdoors in such a manner as not to cause anuisance or danger.

z ASHRAE 15 8.11.3-5zvented to the outdoors utilizing mechanical

ventilation

zone or more power-driven fans To obtainreduced airflow for normal ventilation, multiple ormultispeed fans shall be used. Openings for inletair shall be positioned to avoid recirculation. Airsupply & exhaust ductsshall serve no otherarea. The discharge of air shall be to theoutdoors in such a manner as not to cause anuisance or danger.


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2007 IRC

Dampers

Ventilation LayoutVentilation Layout

LPRHPRINT

Dampers

Recommended Area

of Exhaust Fan(s)

FreshAirRoll-up

Door

2007 IRC

Ventilation EquipmentConsiderations

Ventilation EquipmentConsiderations

z Consider system effects

z Balance of system pressuredrop & fan pressure rise

z Consider location ofexhaust & prevailing weather

z Recirculation

z Impact makeup air units?

z Offsite impacts?

z Consider system effects

z Balance of system pressuredrop & fan pressure rise

z Consider location ofexhaust & prevailing weather

z Recirculation

z Impact makeup air units?

z Offsite impacts?


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2007 IRC

Equipment SpecificationEquipment Specification

z IIAR Bulletin 111z Recommends upblast, high velocity

exhaust fans

z Considerz Fans that dilute the

exhaust with fresh airzOften used for laboratory fume

hood exhaustsz Wetted media exhaust

systems (scrubbers)

z IIAR Bulletin 111z Recommends upblast, high velocity

exhaust fans

z Considerz Fans that dilute the

exhaust with fresh airzOften used for laboratory fume

hood exhaustsz Wetted media exhaust

systems (scrubbers)

2007 IRC

Emergency ControlsEmergency Controls

z Emergency ControlszASHRAE 8.12(i)

z Remote control of themechanical equipment in therefrigerating machinery room

shall be provided immediately outsidethe machinery room door solely forthe purpose of shutting down theequipment in an emergency.Ventilation fans shall be on a separateelectrical control and have a control switchlocated immediately outside the machineryroom door.

z Emergency ControlszASHRAE 8.12(i)

z Remote control of themechanical equipment in therefrigerating machinery room

shall be provided immediately outsidethe machinery room door solely forthe purpose of shutting down theequipment in an emergency.Ventilation fans shall be on a separateelectrical control and have a control switchlocated immediately outside the machineryroom door.


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2007 IRC

Ammonia DetectionAmmonia Detection

zASHRAE 8.11.2.1 exempts ammonia butrequires continuous ventilation at the emergencyamount (8.12(h))

z Despite this exemption, the use of ammonia detectorsis common

z Consider using ammonia detectors for bothpersonnel &property protection

z Personnelz Low level: Audible & Visual Alarms & Ventilation Control

z Property

z High level: Machinery Room Shutdown

z ASHRAE 8.11.2.1 exempts ammonia butrequires continuous ventilation at the emergencyamount (8.12(h))

z Despite this exemption, the use of ammonia detectorsis common

z Consider using ammonia detectors for bothpersonnel &property protection

z Personnelz Low level: Audible & Visual Alarms & Ventilation Control

z Property

z High level: Machinery Room Shutdown

2007 IRC

Electrical ShutdownElectrical Shutdown

z Removes power from all non-classified electricalequipment during high ammonia concentrations

z motors, motor control centers, floats, switches, etc.

z Why? It reduces likelihood of deflagrations in the event

of a non-ventilatable releasez Consider what equipment should be operational during

an emergency situation & specify that equipment with theappropriate classification (NEC Class 1, Div. 2)

z ventilation fans, emergency lighting, alarms, other equipment

z Removes power from all non-classified electricalequipment during high ammonia concentrations

z motors, motor control centers, floats, switches, etc.

z Why? It reduces likelihood of deflagrations in the event

of a non-ventilatable releasez Consider what equipment should be operational during

an emergency situation & specify that equipment with theappropriate classification (NEC Class 1, Div. 2)

z ventilation fans, emergency lighting, alarms, other equipment


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2007 IRC

Safety SystemsSafety Systems

z Eye-wash & Shower Station

z Located outside exit door and anotherrecommended inside machinery room(IIAR 2 6.3.1.4 )

z Consider what you would needIF you need to use it!

z Temperature appropriate for

15 minute de-con shower

zDrench hose

z Change of clothes

z Eye-wash & Shower Station

z Located outside exit door and anotherrecommended inside machinery room(IIAR 2 6.3.1.4 )

z Consider what you would needIF you need to use it!

z Temperature appropriate for

15 minute de-con shower

zDrench hose

z Change of clothes

2007 IRC

Safety Systems (cont.)Safety Systems (cont.)

z Passive containment forrecirculators/vessels

z diking

z drain to temporary holding tank

z Tie ammonia detection and fire protectionalarms into auto-paging system

z Machinery room secured 24/7 with keycard access

z Passive containment forrecirculators/vessels

z diking

z drain to temporary holding tank

z Tie ammonia detection and fire protectionalarms into auto-paging system

z Machinery room secured 24/7 with keycard access


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2007 IRC

ConclusionsConclusions

z Familiarize yourself with the minimumrequirements

z Consider moving beyond minimums

z Emergency shutdown

z Spill containment

z Pseudo-classified space

z Familiarize yourself with the minimumrequirements

z Consider moving beyond minimums

z Emergency shutdown

z Spill containment

z Pseudo-classified space

Questions?Questions?

r&t 2007 - machinery room design - jekel

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