69275070 NFPA20 Presentation Fire Pumps

7/16/2019 69275070 NFPA20 Presentation Fire Pumps

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NFPA20

Standard for the Installation of Stationary Pumps for Fire Protection

Presented by: Khaled Muhsen, Regional Sales Manager – Shurjoint Piping Products, Inc.



Purpose of a FirePurpose of a Fire

PumpPumpTo protect lives and properties against fireTo protect lives and properties against fire

by supplying an adequate water supply toby supplying an adequate water supply to

automatic sprinklers or standpipe systemsautomatic sprinklers or standpipe systems

To meet building codes and insuranceTo meet building codes and insurance

requirementsrequirements



Codes and StandardsCodes and Standards

National Fire Protection Association -National Fire Protection Association -

NFPANFPA

– Establishes the norms that governs all fireEstablishes the norms that governs all fire

installationinstallation

– Continuously revises the codes (Last issueContinuously revises the codes (Last issue

2003)2003)



Listing AuthoritiesListing Authorities

Underwriters Laboratories (UL)Underwriters Laboratories (UL)

Underwriters Laboratories of Canada (ULC)Underwriters Laboratories of Canada (ULC)

Factory Mutual Research Corporation (FM)Factory Mutual Research Corporation (FM)




NFPA PhilosophyNFPA Philosophy – A fire pump system should operate irrespective A fire pump system should operate irrespective

of any damage it may cause to itself of any damage it may cause to itself

– No element of the system under emergencyNo element of the system under emergencyconditions should:conditions should:

Prevent a fire pump from turning onPrevent a fire pump from turning on

Cause a fire pump to turn off Cause a fire pump to turn off

– Changes to the code must be substantiated byChanges to the code must be substantiated bydata or experience (actual scenarios)data or experience (actual scenarios)




NFPA20 Structure:NFPA20 Structure: – Definitions (3 pages)Definitions (3 pages)

– Centrifugal Fire Pumps (5 pages)Centrifugal Fire Pumps (5 pages)

– Positive Displacement Pumps (2 pages)Positive Displacement Pumps (2 pages) – Electric Motors (1 page)Electric Motors (1 page)

– Diesel Engines (4 pages)Diesel Engines (4 pages)

– Controllers (12 pages)Controllers (12 pages) – Pump Installation and RelatedPump Installation and Related

Components (10 pages)Components (10 pages)

– Acceptance Tests and Maintenance (2 Acceptance Tests and Maintenance (2

pages)pages)



Water SupplyWater Supply – Where fire pumps are installed on a city main, a fireWhere fire pumps are installed on a city main, a fire

flow test should be performed to determineflow test should be performed to determineminimum and maximum supply pressures as wellminimum and maximum supply pressures as well

as suitability of supply for the fire protection systemas suitability of supply for the fire protection system

– Where adequate city supply water is unavailable, aWhere adequate city supply water is unavailable, a

suction tank or pit should be installedsuction tank or pit should be installed

– Tank sizing must consider 150% of the fire pumpTank sizing must consider 150% of the fire pump

rated flowrated flow

– Total water requirements are defined in NFPA13Total water requirements are defined in NFPA13(Sprinkler Systems), NFPA14 (Standpipe Systems),(Sprinkler Systems), NFPA14 (Standpipe Systems),

NFPA15 (Spray or Mist Systems), Mains)NFPA15 (Spray or Mist Systems), Mains)



Pump RequirementsPump Requirements

““Centrifugal fire pumps shall be listed for Centrifugal fire pumps shall be listed for

fire protection service.”fire protection service.”

““Pumps shall furnish not less thanPumps shall furnish not less than 150%150%

of rated capacity at not less thanof rated capacity at not less than 65%65% of of

total rated head. The shutoff head shalltotal rated head. The shutoff head shall

not exceednot exceed 140%140% of rated head for anyof rated head for any

type pump.”type pump.”




100% 150%

140%

100%

65%

%Rated Head

%Rated Flow

Max Shutoff Head



Pump SizingPump Sizing““ A stationary pump for fire protection should be A stationary pump for fire protection should be

selected in the range of operation from 90selected in the range of operation from 90percent to 150 percent of its rated capacity. Thepercent to 150 percent of its rated capacity. The

performance of the pump when applied atperformance of the pump when applied at

capacities over 140 percent of rated capacity cancapacities over 140 percent of rated capacity can

be adversely affected by the suction conditions.be adversely affected by the suction conditions. Application of the pump at capacities less than Application of the pump at capacities less than

90 percent of the rated capacity is not90 percent of the rated capacity is not

recommended. The selection and application of recommended. The selection and application of

the fire pump should not be confused with pumpthe fire pump should not be confused with pump

operating conditions. With proper suctionoperating conditions. With proper suction

conditions, the pump can operate at any point onconditions, the pump can operate at any point on

its characteristic curve from shutoff to 150its characteristic curve from shutoff to 150

ercent of its rated ca acit .”percent of its rated capacity.”



Pump SizingPump Sizing

100% 150%

100%

Head

Flow

Pump Design Flow

90%

Pump Rated

Flow



Misinterpreted CodeMisinterpreted Code

RequirementRequirement

– Sizing the fire pump - a listed pump shouldSizing the fire pump - a listed pump should

be applied for flows from 90% to 150% of be applied for flows from 90% to 150% of

its rated pointits rated point

– Most fire pumps are sized to exceed theMost fire pumps are sized to exceed theduty requirement of the fire protectionduty requirement of the fire protection

systemsystem

– The rated flow is a convention used toThe rated flow is a convention used toregulate the listing of pumpsregulate the listing of pumps




FM & UL require that fire pumps haveFM & UL require that fire pumps have

packing sealspacking seals

ULC allows mechanical sealsULC allows mechanical seals

Packing requires periodic adjustment andPacking requires periodic adjustment and

replacement as it hardens over timereplacement as it hardens over time

The packing gland should be tightenedThe packing gland should be tighteneduntil the seal leaks 30 drips per minuteuntil the seal leaks 30 drips per minute

If the gland is tightened to much, the sealIf the gland is tightened to much, the seal

receives no lubrication and will burnreceives no lubrication and will burn



Allowable Pump Allowable Pump

TypesTypes

– Horizontal Split CaseHorizontal Split Case

– Vertical In-LineVertical In-Line

– End SuctionEnd Suction – Vertical TurbineVertical Turbine



Horizontal Split Case Fire

Pumps



HSC Fire PumpsHSC Fire Pumps

BENFITSBENFITS – Available in a wide Available in a wide

flow and head rangeflow and head range

– Serviceable withoutServiceable without

disturbing piping or disturbing piping or driver driver

– Available in electric Available in electric

or diesel driveor diesel drive

DRAWBACKSDRAWBACKS – Large floor spaceLarge floor space

requirementrequirement

– Restricts mechanicalRestricts mechanical

room layout due toroom layout due todirection of rotationdirection of rotation

– More costlyMore costly

– More difficult toMore difficult to

serviceservice



Vertical In-Line Fire PumpsVertical In-Line Fire Pumps



VIL Fire PumpsVIL Fire PumpsBENEFITSBENEFITS

– CompactCompact

– ServiceableServiceable

– ReliableReliable

– Cost EffectiveCost Effective

DRAWBACKSDRAWBACKS

– Only available up toOnly available up to

1500GPM1500GPM

– Electric Drive OnlyElectric Drive Only

–Requires suctionRequires suction

strainer strainer



End Suction Fire Pumps



End Suction Fire PumpsEnd Suction Fire Pumps

BENFITSBENFITS – Moderate floor spaceModerate floor space

requirementrequirement

– Flexibility inFlexibility in

mechanical roommechanical roomlayoutlayout



– ServiceableServiceable

DRAWBACKSDRAWBACKS – Only available up toOnly available up to

1500gpm1500gpm

– Single suction designSingle suction design

limits hydrauliclimits hydraulicefficiencyefficiency



Vertical Turbine Fire

Pumps

Used where aUsed where a

flooded suctionflooded suction

cannot becannot bemaintainedmaintained

Underground water Underground water

sources or belowsources or below

ground tanks withground tanks with

above ground pumpabove ground pump

roomroom



Vertical Turbine FireVertical Turbine Fire

PumpsPumpsBENFITSBENFITS

– Will operate under Will operate under

suction liftsuction lift



– Available over wide Available over wide

flow and head rangeflow and head range

DRAWBACKSDRAWBACKS

– More costlyMore costly

– More difficult toMore difficult toservice and installservice and install



Typical ApplicationTypical Application

Wet Pit - ElectricWet Pit - Electric

Motor Driver Motor Driver



Typical ApplicationTypical Application

Wet Pit - Diesel Engine Driver Wet Pit - Diesel Engine Driver



Suction &DischargeGauges Air

ReleaseValve

Pressure Relief Valve•three pressureranges•adjustable on

site

NFPA RequiredNFPA Required

Pump AccessoriesPump Accessories



Suction gauge must be of Suction gauge must be of

the compound type (capablethe compound type (capable

of reading negative pressureof reading negative pressure

or vacuum)or vacuum)

Discharge gauge must readDischarge gauge must read

two times the workingtwo times the working

pressure of the pump andpressure of the pump and

not less than 200psinot less than 200psi


Pump AccessoriesPump Accessories



1/2” Air Release Valve is1/2” Air Release Valve is

requiredrequired

Exception: top centre-lineException: top centre-line

discharge end suction anddischarge end suction andvertical fire pumpsvertical fire pumps

Air Release Valve Air Release Valve



3/4” up to 2500usgpm3/4” up to 2500usgpm

1” over 3000usgpm1” over 3000usgpm

Should be set between theShould be set between the

maximum suction pressure andmaximum suction pressure andminimum suction pressure plusminimum suction pressure plus

the closed valve pressure of thethe closed valve pressure of the

pumppump

Piped before the fire pumpPiped before the fire pumpdischarge check valvedischarge check valve

Casing Relief ValveCasing Relief Valve



• Suction OS&Y GateValve

• Discharge ButterflyValve

• Both must besupervised

• Discharge ButterflyValve Installed after

“Test Tee” andpressure sensing line

Isolation ValvesIsolation Valves



Hose Valve SystemsHose Valve Systems

– Provides testing meansProvides testing means

– Sized by pump ratedSized by pump rated

capacitycapacity

– There are hundreds of There are hundreds of different thread typesdifferent thread types

depending on jurisdictiondepending on jurisdiction

- type should be- type should be

specified on projectsspecified on projects



Flow MetersFlow Meters – Does not replace a hose valve systemDoes not replace a hose valve system

– Flow meters must be listed for fire protectionFlow meters must be listed for fire protection

serviceservice

– Gauge reading is a minimum of 175% the pumpGauge reading is a minimum of 175% the pump

rated flowrated flow – Provides a testing means without wasting water Provides a testing means without wasting water

– Flow meter is installed in bypass back to suctionFlow meter is installed in bypass back to suction

– Must be installed with isolation valves per Must be installed with isolation valves per manufacturer’s specificationsmanufacturer’s specifications

– RULE OF THUMB:RULE OF THUMB:

Annular Type - 10Ø upstream - 5Ø downstream Annular Type - 10Ø upstream - 5Ø downstream

Venturi Type - 7Ø upstream - 5Ø downstreamVenturi Type - 7Ø upstream - 5Ø downstream



Main Relief ValvesMain Relief Valves

and Waste Conesand Waste Cones – Sized by pump ratedSized by pump rated

capacitycapacity

– Spring or pilot operatedSpring or pilot operated

– Waste cone providesWaste cone provides

visibility of flow throughvisibility of flow through

the valvethe valve

– When it is used:When it is used:11))Diesel driven systemsDiesel driven systems

22))Electric systemsElectric systems??????



Main Relief Valve -Main Relief Valve -

Diesel PumpsDiesel Pumps

1000

30

165

130

psi

GPM

Shutoff Head

@ RatedSpeed

20

1500

Shutoff Head@ 10%

Overspeed179

M i R li f V lM i R li f V l



Main Relief ValvesMain Relief Valves

and Waste Conesand Waste Cones

– Recommended on all dieselRecommended on all dieseldriven systemsdriven systems

– Not required on diesel if Not required on diesel if

maximum supply pressure plusmaximum supply pressure plus

1.21 x closed valve pressure1.21 x closed valve pressure

does not exceed systemdoes not exceed system

pressure ratingpressure rating

– NFPA allows piping back toNFPA allows piping back tosuction - NOT recommendedsuction - NOT recommended

– Relief valve should be set belowRelief valve should be set below

maximum pressure rating of themaximum pressure rating of the

systemsystem



Main Relief Valve -Main Relief Valve -

Electric PumpsElectric Pumps

1000

60

180

130

psi

GPM

Max Shutoff Head

20

1500

Rated Head



Misinterpreted CodeMisinterpreted Code

RequirementRequirement – Devices in the discharge piping - mainDevices in the discharge piping - main

relief or pressure reducing valves shouldrelief or pressure reducing valves should

only be installed where absolutelyonly be installed where absolutely

necessarynecessary – Valves introduce a failure mode andValves introduce a failure mode and

should only be used when requiredshould only be used when required



Piping, Relief Valves, Metering Devices, andPiping, Relief Valves, Metering Devices, and

Hose Valves should be sized according toHose Valves should be sized according to

Table 2-20 on Page 20-13Table 2-20 on Page 20-13..

NFPA Fitting SizingNFPA Fitting Sizing




Pump AccessoriesPump AccessoriesFire Pump Rating

GPM (L/s)

Suction

Size (in.)

Discharge

Size (in.)

Relief Valve

Size (in.)

Relief Valve

Discharge

(in.)

Flow Meter

Size (in.)

Number &

Size of Hose

Valves

Hose Valve

Manifold

Size (in.)

25 (95) 1 1 ¾ 1 1¼ 1 - 1½ “ 1

50 (189) 1½ 1¼ 1¼ 1½ 2 1 - 1½ “ 1½

100 (379) 2 2 1½ 2 2½ 1 - 2½ “ 2½

150 (568) 2½ 2½ 2 2½ 3 1 - 2½ “ 2½

200 (757) 3 3 2 2½ 3 1 - 2½ “ 2½

250 (946) 3½ 3 2 2½ 3½ 1 - 2½ “ 3

300 (1136) 4 4 2½ 3½ 3½ 2 - 2½ “ 3

400 (1514) 4 4 3 5 4 2 - 2½ “ 4

450 (1703) 5 5 3 5 4 2 - 2½ “ 4

500 (1892) 5 5 3 5 5 2 - 2½ “ 4

750 (2839) 6 6 4 6 5 3 - 2½ “ 6

1000 (3785) 8 6 4 8 6 4 - 2½ “ 61250 (4731) 8 8 6 8 6 6 - 2½ “ 8

1500 (5677) 8 8 6 8 8 6 - 2½ “ 8

2000 (7570) 10 10 6 10 8 6 - 2½ “ 8

2500 (9462) 10 10 6 10 8 8 - 2½ “ 10

3000 (11,355) 12 12 8 12 8 12 - 2½ “ 10



Pressure Maintenance PumpPressure Maintenance Pump

(Jockey(Jockey

))

Every system has a normal leakage rateEvery system has a normal leakage rate

that will result in a pressure dropthat will result in a pressure drop

Jockey Pump will maintain the pressure inJockey Pump will maintain the pressure in

the systemthe system

This will prevent the main fire pump fromThis will prevent the main fire pump from

starting for minor leaksstarting for minor leaks



Jockey PumpsJockey Pumps

Jockey (pressure maintenance) pumps andJockey (pressure maintenance) pumps and

jockey controllers need not be listed for fire jockey controllers need not be listed for fire

protection service.protection service.

““The primary or standby fire pump shall not beThe primary or standby fire pump shall not be

used as a pressure maintenance pump.”used as a pressure maintenance pump.”

A jockey pump should be sized such that it A jockey pump should be sized such that it

CANNOT meet the flow demand of a singleCANNOT meet the flow demand of a single

sprinkler fixture.sprinkler fixture.



Jockey Pump SizingJockey Pump Sizing

Jockey pumps should be sized for 1% of Jockey pumps should be sized for 1% of

the flow of the main fire pumpthe flow of the main fire pump

Jockey pumps should be sized to provideJockey pumps should be sized to provide

10psi more pressure than the main fire10psi more pressure than the main fire

pumppump

Jockey pump should be sized so that itJockey pump should be sized so that it

cannot meet the demand of the lowestcannot meet the demand of the lowestflow fire protection fitting in the systemflow fire protection fitting in the system



Fire Pump OperationFire Pump Operation

– Fire pumps are designed to start on aFire pumps are designed to start on a

pressure switch settingpressure switch setting

– Some fire pumps can be started automaticallySome fire pumps can be started automatically

based on a deluge valve opening, or a remotebased on a deluge valve opening, or a remotesignalsignal

– The pressure sensing line is the lifeline for theThe pressure sensing line is the lifeline for the

fire protection systemfire protection system



Fire Pump OperationFire Pump Operation – Pressure switches should be rated for maximumPressure switches should be rated for maximum

pressure conditionspressure conditions

– Sensing lines must be 1/2” non-ferrous (copper)Sensing lines must be 1/2” non-ferrous (copper)

with two check valves with a 3/32” hole drilled in thewith two check valves with a 3/32” hole drilled in the

flapper flapper – Check valves are for damping of pressure when theCheck valves are for damping of pressure when the

pump starts to protect the pressure switchpump starts to protect the pressure switch

– Check valves are installed 5 feet apart and mustCheck valves are installed 5 feet apart and must

open on a pressure drop in the sensing lineopen on a pressure drop in the sensing line

– Check valves close when the pump startsCheck valves close when the pump starts

– Jockey pump and fire pump sensing lines must beJockey pump and fire pump sensing lines must be

separateseparate



System gradually loosespressure

50

9095

100

110

Jockey startFire Pump start

Stop Point

Pump shutoff

psi

Time period

boost

Fire Pump OperationFire Pump Operation



Critical New Code RequirementsCritical New Code Requirements

(2003(2003)) – Extensive changes to NFPA20 includingExtensive changes to NFPA20 including

chapter numberschapter numbers

– Fire pump sizing will move from theFire pump sizing will move from the

Appendix to the main text of the code Appendix to the main text of the code – Greater clarity on devices in the dischargeGreater clarity on devices in the discharge

pipingpiping

– Provisions for the acceptance of electronicProvisions for the acceptance of electronicspeed governors on diesel enginesspeed governors on diesel engines

– Reference to NEMA ICS 14-2001 asReference to NEMA ICS 14-2001 as

Appendix B (Application Guide for Electric Appendix B (Application Guide for Electric

Fire Pump Controllers)Fire Pump Controllers)



Critical New Code RequirementsCritical New Code Requirements

(2003(2003)) – Diesel tank supervision and markingsDiesel tank supervision and markings

– Alternate valve arrangement for diesel Alternate valve arrangement for diesel

cooling linescooling lines

– Provision for reading amperage andProvision for reading amperage andvoltage on limited service controllersvoltage on limited service controllers

– Variable speed drivers as pressure limitingVariable speed drivers as pressure limiting

devicesdevices – Copper lines and fittings not allowed for Copper lines and fittings not allowed for

diesel pipingdiesel piping



Typical System Performance - 500gpm, 160psi

including 85psi Suction Pressure

100

110

120

130

140

150

160

170

180

190

200

210

220

0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800

Flow - GPM

H e a d - P S I

2700

2800

2900

3000

3100

3200

3300

3400

3500

3600

R P M

PLT OFF 85psi Suct

PLT ON 85psi Suct

PLT ON 85psi RPM

PLT OFF 85psi RPM

System Press ure

Limit

Pressure Limiting

Control RangeRPM

System Pressure

RPM



FIRE PUMP CONTROLLERSFIRE PUMP CONTROLLERS

Diesel or ElectricDiesel or Electric

Full Service or Limited ServiceFull Service or Limited Service

HP of the motor HP of the motor Voltage of the installationVoltage of the installation

Withstand ratingWithstand rating

Starting methodStarting method



Across the Line Across the Line

– Limited Service - Under 30hpLimited Service - Under 30hp

– Full ServiceFull Service

Reduced VoltageReduced Voltage

– Auto Transformer Auto Transformer

– Wye Delta - Special Motor Wye Delta - Special Motor

RequiredRequired

– Part Winding - Special Motor Part Winding - Special Motor

RequiredRequired

– Primary Resistor Primary Resistor

CONTROLLER STARTING METHODCONTROLLER STARTING METHOD

CO O S G O



CONTROLLER STARTING METHODCONTROLLER STARTING METHOD

600

of FullLoad

Current

Full speed

390

252200

FULL VOLTAGE

PRIM.

RESISTOR

PART WINDING

AUTO-

TRANSFORMER

WYE DELTA

FULL LOADCURRENT

420

100

O C S



AUTOMATIC TRANSFER AUTOMATIC TRANSFER

SWITCHESSWITCHESWhat is it?What is it?

– An additional controller used An additional controller used

in case of a power failurein case of a power failure

Why use it?Why use it? – To transfer the power toTo transfer the power to

another source (generator another source (generator

or diesel)or diesel)

When to use it?When to use it? – If Authorities Require OneIf Authorities Require One

– If Power Source not ReliableIf Power Source not Reliable

S CO O S



Serve Three Basic FunctionsServe Three Basic Functions::

• Start the Diesel Engine in an emergencyStart the Diesel Engine in an emergency

• Monitor the Operation and Condition of theMonitor the Operation and Condition of the

Diesel EngineDiesel Engine• Keep the batteries chargedKeep the batteries charged

DIESEL CONTROLLERSDIESEL CONTROLLERS

DIESEL CONTROLLERS



Diesel Can be Started by Three MethodsDiesel Can be Started by Three Methods::

• Pressure Switch (In the Automatic Mode)Pressure Switch (In the Automatic Mode)

• Pressure Switch (In the Test Mode)Pressure Switch (In the Test Mode)

• Manual Cranking (In the Automatic or ManualManual Cranking (In the Automatic or ManualMode)Mode)

Starting sequenceStarting sequence::

• Alternating cranking sequence Alternating cranking sequence• Six cranks every 30 seconds until diesel startsSix cranks every 30 seconds until diesel starts

• If diesel fails to start, an alarm is activatedIf diesel fails to start, an alarm is activated


DIESEL CONTROLLERS



Diesel Can be Stopped by TwoDiesel Can be Stopped by TwoMethodsMethods::

• Manually by Pushing the Stop ButtonManually by Pushing the Stop Button

• Automatically after 30 minutes during Automatically after 30 minutes duringweekly testweekly test

Overspeed shutdown:Overspeed shutdown:

• A diesel fire pump will shut down in an A diesel fire pump will shut down in anemergency condition if the diesel operatesemergency condition if the diesel operates

more than 20% faster than the ratedmore than 20% faster than the rated

speedspeed


S CO O SDIESEL CONTROLLERS



Diesel Controller AlarmsDiesel Controller Alarms• Battery and Charger FailuresBattery and Charger Failures

• Diesel operating condition (High CoolantDiesel operating condition (High Coolant

Temperature, Low Oil Pressure, Overspeed,Temperature, Low Oil Pressure, Overspeed,Failure to Start)Failure to Start)

• Contacts for remote indication of alarmContacts for remote indication of alarm

conditionsconditions

• Optional Pump Room Alarms (Low suctionOptional Pump Room Alarms (Low suction

pressure, flow meter on, Main Relief Valvepressure, flow meter on, Main Relief Valve

open, Low/High Pump Room temperature, Lowopen, Low/High Pump Room temperature, Low

fuel level, Others )fuel level, Others )





Battery Charging Systems:Battery Charging Systems:• One charger for each set of batteriesOne charger for each set of batteries

• Chargers are capable of fully charging theChargers are capable of fully charging the

batteries in 24 hoursbatteries in 24 hours• Batteries remain in an overchargedBatteries remain in an overcharged

conditioncondition


Pump MaintenancePump Maintenance



Pump MaintenancePump MaintenancePump acceptance tests are defined in NFPA20Pump acceptance tests are defined in NFPA20

Chapter 11Chapter 11Inspection and maintenance are defined in NFPA25Inspection and maintenance are defined in NFPA25

Chapter 5Chapter 5

Seals and bearings are the highest maintenance itemSeals and bearings are the highest maintenance item

for a pumpfor a pump

The packing should be checked and adjusted eachThe packing should be checked and adjusted each

time the pump is testedtime the pump is tested

As fire pumps do not run often, bearings should be As fire pumps do not run often, bearings should bechecked for cleanliness and to ensure that adequatechecked for cleanliness and to ensure that adequate

oil or grease has been applied (depending on the typeoil or grease has been applied (depending on the type

of bearing)of bearing)



Thank youThank you!!

69275070 NFPA20 Presentation Fire Pumps

Documents

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nfpa20 presentation

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water supplywater supply

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adequate water supply

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