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NFPA 2009 Convention Session T33
Citation preview
Sprinkler Fire Pumps System Pressure Control
- by -
James S. Nasby
Columbia Engineering
File: CE Fire Pump System Pressure Control.ppt
2
Main Topics Covered:NFPA 20 -2007 Provides Three New Means of
Pressure Control in Sprinkler Systems: 1) Break Tanks2) Pressure Regulating or Reducing Valves3) Variable Speed Diesel Driven Fire Pumps 4) Variable Speed Electric Motor Driven Fire
Pumps 5) Bypass Methods of Motor Starting Application for variable Speed Pumps & Case
Studies: 6) High Rise and Warehouse Systems 7) Horizontal and Vertical Fire Pump Examples8) Combined (Dual Use) Systems9) Requirement for Successful Installations
3
1 - Break Tanks 5.30 Break Tanks. Where a break tank is used to provide
the pump suction water supply, the installation shall comply with this section.
5.30.1 Application. Break tanks are used for one or more of the following reasons:
(1) As a backflow prevention device… [E.g.: City of Houston, Texas]
(2) To eliminate pressure fluctuations in the city water supply…
(3) To augment the city water supply…
5.30.2 Break Tank Size. The tank shall be sized for a minimum duration of 15 minutes with the fire pump operating at 150 percent of rated capacity.
5.30.3 Refill Mechanism -- on next slides. 5.30.4 The break tank shall be installed in accordance with
NFPA 22, Standard for Water Tanks for Private Fire Protection.
4
Break Tanks - cont'dRefill Requirements
5.30.3 Refill Mechanism - refill mechanism must be listed for automatic operation.
5.30.3.1 If the break tank capacity is less than the maximum system demand for 30 minutes, the refill mechanism must meet 5.30.3.1.1 through 5.30.3.1.5.
5.30.3.1.1 Dual automatic refill lines: each capable of refilling at a min. rate of 150 percent of the fire pump(s) capacity
5.30.3.1.2 If available supplies do not permit 150 percent, each refill line must be capable of at least 110 percent of the max. system design flow.
5.30.3.1.3 A manual tank fill bypass designed & capable of refilling the tank at at least150 percent of the fire pump(s) capacity must be provided.
5.30.3.1.4 If available supplies do not permit 150 percent, the manual fill bypass must be capable of at least 110 percent of the max. system design flow.
5.30.3.1.5 A local visible and audible low liquid level signal must be provided in the vicinity of the tank fill mechanism.
5
Break Tanks Refill Requirements - cont'd 5.30.3.2 If the break tank is sized to a min. of 30
minutes of the max. system demand, the refill mechanism must meet 5.30.3.2.1 through 5.30.3.2.5.
5.30.3.2.1 The refill mechanism must supply 110 percent of total fire protection system demand [110% × (Total Demand Tank Capacity) / Duration]
5.30.3.2.2 A manual tank fill bypass must also supply the tank at 110 percent of the total system demand [110% × (Total Demand Tank Capacity) / Duration]
5.30.3.2.3 The pipe between the city connection and the automatic fill valve must be installed per NFPA24, Standard for the Installation of Private Fire Service Mains and Their Appurtenances.
5.30.3.2.4 The automatic filling mechanism must be maintained at a min. temperature of 40°F (4.4°C).
5.30.3.2.5 The automatic filling mechanism must activate a maximum of 6 in. (152 mm) below the overflow level.
6
2 - Pressure Regulating or Reducing Valves
Floor Valves- Recognized in NFPA-13- Some Redundancy (Floor Below and/or Floor Above)- Prohibited in some jurisdictions
Riser or Main Valves- Prohibited in NFPA-20 - Clause 5.15.10 "No pressure-regulating devices…"
[except for "Low Suction Throttling Valves"] & - Clause 5.7.6.2* Pressure relief valves and pressure
regulating devices in the fire pump installation shall not be used as a means to meet the requirements of 5.7.6.1.
- Prohibited in NFPA-24 5.3.1 "No pressure-regulating valve…"
- Recognized in NFPA-14 -- but:Anecdotal and direct observation of failures:Stick Open or Closed & Destructive Oscillation
7
3 - Variable Speed Diesel Engine Driven Fire PumpsSalient Points: Mechanical Pressure Control Limited (3) Pre-Set Pressures Available Not Field Adjustable Dynamic Response Times Not Field
Adjustable EPA Emission Limitations (Mechanical
Injection & Speed Governor) Not Factory Mutual Approved
8
4 - Variable Speed Electric Motor Driven Fire Pumps
Salient Points: Redundant Back-up Means:
Automatic fall-back to Full Speed RunningManual Mode Switch and Mechanical Operator
Precise PID* Control Loop (Feedback Control System)
Field AdjustableAny Pressure Set-PointPrecise Control Over Gains and Dynamic Timing
NEMA 12 (U.L. Type 12) Non-Vented Construction Available
Excludes Dirt, Moisture, Water, Insects, etc.Protects VFD circuitry
Five Year Standard Factory Warrantee Available
* PID = Proportional - Integral - Differential (Process Controller)
9
Variable Speed Electric Motor Driven Fire Pumps - cont'd
Salient Points - continued: Extensive Field Experience:
Over Five Years of Operation HistoryOver Fifty Unit-Years of ExperienceOver 25,000 Running Hours of Experience (20K for One Unit)
Stable over Widely Varying HydraulicsRobust PID Loop can handle: Fast, Slow and Multiple
Hydraulic Time Constants. Very Precise Pressure Control Acheivable
Controls to Within a Fraction of One PSISettles Pump Output to Desired Pressure Set Point Rapidly
U.L. Listed and F.M. Approved Construction Available
Some available with a 50°C (122°F) Temperature Rating Reduced Power and Demand Charger for Weekly
Testing
10
Variable Speed Electric Motor Driven Fire Pumps - cont'd
Mandatory Elements (NFPA-20 Section 10.10)Variable Speed Section
Full Fire Pump Controller Section
Automatic and Manual Switch-over Circuitry
VFD (Variable Speed Drive)
Separate Pressure Transducer for PID Feedback
Restart Delay on Switch to Bypass
Fully Isolated VFD (Off-line in Stand-by Condition)
Fused Variable Speed to Protect the Bypass Path
Minimum 5% Line Reactor (most also have a D.C. one)
Additional Alarm Signals & Contacts
11
Variable Speed Electric Motor Driven Fire Pumps - cont'dNFPA-20 Further Requirements (Section
10.10): Continuous Full Rated Horsepower VFD Automatic Switch to Bypass if:
VFD doesn't respond in 5 secondsPressure is low for more than 15 seconds
Lock in Bypass Mode (Avoids False Operation)
Fully Coordinated Protection Between Variable Speed and Bypass Paths
Lockable Cabinets Separate Control for Multiple Pump Sites
(No Common Control, No Common Point of Failure)
12
Variable Speed Motor Drive Controller
13
Variable Speed Motor Drive Controller
14
Variable Speed Motor Drive Controller
Full Speed Bypass Path
Variable Speed Path
Fully Redundant Fire Pump Controller
Note: A-T-L (D-O-L) Full Voltage Starting
in this Example
15
Variable Speed Motor Drive Controller
16
Variable Speed Motor Drive Controller
17
Variable Speed Motor Drive Controller
Bays: FPC Section, Transfer Switch Section, VFD Section.
18
Variable Speed Motor DrivesVFD Theory of Operation
3 Phase
Line Freq.
AC to DC
Smoothing(Ripple Reduction)
DC / AC
(at "X" KHz)
19
Variable Speed Motor DrivesVFD Theory of Operation - cont'd
2 KHz
One Cycle
VFD Inverter Output Voltage Waveform
20
Variable Speed Motor DrivesVFD Theory of Operation - cont'd
Approximate Motor Current Waveform
2 KHz Ripple
One Cycle
21
Variable Speed Electric Motor Driven Fire Pumps - cont'd
The Installation Must Be Such That: Maximum ambient must not exceed controller (marked) rating Mfr's vent air clearance spaces and service spaces must be
adhered to The motor must be suitable for use with a variable speed drive Motor current draw must not exceed 100% of FLA, even though
the motor may have a 1.15 or higher service factor A gen-set must be suitable for use with a variable speed drive The power source must be capable of bypass mode Starting
method The pump and motor must be rigidly coupled The pump and motor must be properly grouted A relief valve is required for emergency operation unless
system pressure can not be exceed at churn and full speed and max. suction pressure
22
Variable Speed Electric Motor Driven Fire Pumps - cont'd
Successful Installations require a Suitable Controller: UL Listed and F.M. Approved** Note that F.M. Approval requires both Low and High
Temperature testing of the entire controller and at full and partial loads, and also the pressure regulation accuracy over both various loads and temperature extremes.
A U.L. Listed Type 12 (NEMA 12) Non-Vented Enclosure Air to Air or Air to Water Cooling Means Rated NEMA 12 or
better** Not dependant on air conditioning or other refrigeration
schemes. Set point and VFD parameters stored in permanent non-
volatile memory (Flash or EEPROM)** Not dependant on battery backed memory schemes. Flexible and Robust VFD with 800 Vdc or higher Over-
voltage Shutdown (D.C. Capacitor Voltage) A Flexible and Robust PID (Pressure Regulation) Loop
23
Variable Speed Electric Motor Driven Fire Pumps - cont'd
Possible responses from any feedback control system.
Under Damped ResponseUncontrolled (Destructive) Oscillation
Critically Damped (Ideal) Response
Over Damped Response
24
Variable Speed Motor Drive Pumps Multi-Acre Multi-Building Campus
Fire Pump House
Location
Tower55 Acre Campus
25
Variable Speed Motor Drive Pumps Multi-Acre Multi-Building Campus
(253 Second Chart Span)
Multiple Fire Water Loops
- plus -
Remote Tower
- lead to -
Multiple System Hydraulic Time
Constants
Note that these were measured
after pump shutdown
26
Variable Speed Motor Drive Pumps Multi-Acre Multi-Building Campus
(151 Second Chart Span)
27
Variable Speed Motor Drive Pumps Multi-Acre Multi-Building Campus
(86 Second Chart Span)
28
Variable Speed Motor Drive Pumps Multi-Acre Multi-Building Campus
Measured:
25s, 20s, 4s, 2s
Hydraulic Time Constants
---
Stable pressure control requires a robust PID control
loop and expert set-up knowledge and
experience.
(63 Second Chart Span)
29
Variable Speed Electric Motor Driven Fire Pumps - cont'dNFPA-20 Further Requirements: Continuous Full Rated Horsepower VFD Automatic Switch to Bypass if:
VFD doesn't respond in 5 secondsPressure is low for more than 15 seconds
Lock in Bypass Mode (Avoids False Operation)
Fully Coordinated Protection Between Variable Speed and Bypass Paths
Lockable Cabinets Separate Control for Multiple Pump Sites
(No Common Control, No Common Point of Failure)
30
Variable Speed Electric Motor Driven Fire Pumps - cont'd
NFPA-20 Requirements - cont'd - Main Relief Valves: 5.18.1.1 Where a diesel engine fire pump is installed and
where a total of 121 percent of the net rated shutoff (churn) pressure plus the maximum static suction pressure, adjusted for elevation, exceeds the pressure for which the system components are rated, a pressure relief valve shall be installed.
5.18.1.2* Pressure relief valves shall be used only where specifically permitted by this standard.
5.18.1.3 Where an electric variable speed pressure limiting control driver is installed, and the maximum total discharge head adjusted for elevation with the pump operating at shutoff and rated speed exceeds the pressure rating of the system components, a pressure relief valve shall be installed.
Note: Regarding 5.18.1.3, where the pump churn (shutoff) pressure at full speed plus the max. suction pressure does not exceed the system pressure rating, the relief valve is not needed and should be avoided since it is a point of failure if it opens prematurely or gets stuck open.
31
Variable Speed Electric Motor Driven Fire Pumps - cont'd
NFPA-20 Requirements - cont'd - Main Relief Valves: 9.5.1.1 All motors shall comply with NEMA MG-1,
Motors and Generators, shall be marked as complying with NEMA Design B standards, and shall be specifically listed* for fire pump service.
9.5.1.3 Motors used with variable speed controllers shall additionally meet the applicable requirements of NEMA MG-1, Motors and Generators, Part 31 and shall be marked for inverter duty.
9.5.2.2(2) Where the motor is used with a variable speed pressure limiting controller, the service factor shall not be used.
* No Listed Variable Speed Fire Pump Motors yet. However, the motors used must still otherwise meet all three of these clauses.
32
Induction Motor Locked Rotor Codes
Table M-02 -- Motor Locked Rotor Code KVA Data and Allowed Horsepowers
"F" "G" "H" "J" Code Letter
Min. Max. Min. Max. Min. Max. Min. Max.
KVA per Hp 5.00 5.59 5.60 6.29 6.30 7.09 7.10 7.99 LRA/FLA 482% 540% 540% 608% 608% 685% 685% 772% Allowed Hp 15 Hp and up 15 Hp and up 5 thru 10 Hp 5 Hp only
Note: The LRA/FLA ratios shown are approximate for illustration only.
Note: Controllers (15 Hp and higher rated ) are NOT rated, tested, approved, or listed for starting codes above Code "G".
33
9 - Bypass Methods of Motor StartingEight Common Motor Starting Types: Across‑the‑Line (A‑T‑L or Direct‑On‑Line) Part Winding (Half Winding) Start Primary Resistor Start* Primary (or Neutral) Reactor Start Wye‑Delta (Star‑Delta) ‑ Open Transition* Wye‑Delta (Star‑Delta) ‑ Closed Transition* Soft Start / Soft Stop (SCR Phase Modulation) Autotransformer*
*Not Recommended for Variable Speed Applications
34
Bypass Methods of Motor Starting - Full Voltage
Across-The-Line (Direct-On-Line) - Full Voltage Starting
Starting
Amps = 600%
KWatt = 240%
Torque* = 100%
*Reference Value
35
Bypass Methods of Motor Starting - Part Winding
Starting
Amps = 390%
KWatt = 156%
Torque* = 48%
*Will bring Fully Loaded Pumps up to Speed
36
Bypass Methods of Motor Starting - Part Winding
Note: The Motor Must be Wound Specifically for Part Winding Start.
37
Bypass Methods of Motor Starting - Primary Resistor
Reference Only Greatly Increases Starting KW load on Gen-Sets due to High Power Factor (0.80pf on 65% Tap Setting)
38
Bypass Methods of Motor Starting - Primary Reactor
Starting
Amps = 390%
KWatt = 111%
Torque* = 42%
*Will bring Fully Loaded Pumps up to Speed
39
Bypass Methods of Motor Starting - Primary Reactor
40
Bypass Methods of Motor Starting - Y-Δ Closed Transition
Starting
Amps = 200 / 600%
KWatt = 80 / 240%
Torque* = 33%
*Will NOT bring Fully Loaded Pumps up to Speed
Also requires additional Wye contactor Interlocking in addition to Motor Contactors (not practical).
41
Bypass Methods of Motor Starting - Y-Δ Closed Transition
The "Y" and "M2" Contactors must be both Electrically and Mechanically Interlocked to avoid inadvertent short circuits.
42
Bypass Methods of Motor Starting - Y-Δ Open Transition
Same Problems as with Y-Δ Closed Transition But also has a Transition Hazard (High Spike Current which can cause the Circuit Breaker to Trip with Stiff Source)
Lagging
Leading Closed
43
Bypass Methods of Motor Starting - Soft Start (Solid State)
Starting
Amps = 240 / 400%
KWatt = Ramps
Torque* = 16 / 44%
*Will bring Fully Loaded Pumps up to Speed
44
Bypass Methods of Motor Starting - Soft Start (Solid State)
45
Bypass Methods of Motor Starting - Autotransformer
Starting
Amps = 276%
KWatt = 110%
Torque* = 42%
*Will bring Fully Loaded Pumps up to Speed
Requires additional Wye contactor Interlocking in addition to Motor Contactors (not practical).
46
Bypass Methods of Motor Starting - Autotransformer
The "Y" and "M" Contactors must be both Electrically and Mechanically Interlocked to avoid inadvertent short circuits.
47
Starting Methods -vs- Motor
Types
Table M-04 - Motor and Starting Types
Starting Type Motor Type Starting Type Motor Type
Full voltage Standard/Any Primary Reactor Standard/Any
Part Winding Part Winding Primary Resistor Standard/Any
Wye Delta - Closed Delta Run Autotransformer Standard/Any
Wye Delta - Open Delta Run Soft Start (SCR) Standard/Any
Neutral Reactor Wye Running Wound Rotor Wound rotor
Motor Starting Characteristics
Parameter Chart
Fire Pump Starting Type Characteristics - for - Electric Fire Pump Motors and Controllers
Starting Characteristics (at Stall) -- Typical Values -for- Fully Load Pump (1) Starting Starting Starting Accelerate Motor Motor Amps Amps Starting Power Starting Full Load Type Contactors Closed & KVA & KVA Power % F.L. Torque to Starting Type Note Note (3) Transition % LRA % FLA Factor Note (4) % ATL Full Speed Notes Across-the-Line Any 1 N/A 100% 600% 40% 240% 100% Yes (a)
Part Winding Special (2) 2 Yes 65 390 40 156 48 Usually (b) Primary Resistor Any 2 Yes 65 390 80 314 42 Yes (c)
Primary Reactor Any 2 Yes 65 390 28 111 42 Yes (c) Neutral Reactor 6/12 Lead 2 Yes 65 390 28 111 42 Yes (c)
Wye-Delta Open 6/12 Lead 3 No 33/100 200/600 40 80/240 33 No (d) Wye-Delta Closed 6/12 Lead 4 Yes 33/100 200/600 40 80/240 33 No (d)(e)
Soft Start/Stop Any 1/2 Yes 40/67 240/400 Varies Ramps 16/44 Yes (f) Autotransformer Any 3 Yes 46 276 40 110 42 Yes (c)(g)
Motor Starting Characteristics
Parameter Notes to Chart
Motor Starting Characteristics Chart Notes (1) Refer to Factory details. (2) Part Winding Motors must be wound specifically for this service. Some motors may not
accelerate to full speed in the starting mode. See Note (b). (3) Units with two or more contactors have two basic steps (Accelerate & Run) with steps three
and four being for transitions. (4) Starting KW Power as a percent of motor full load power requirement. (a) Also called "A-T-L" or Direct-On-Line. Motor Power Factor taken as 40%. Other values
shown are due to the effects of the controller. (b) Part Winding Parameters vary with the motor. Starting Amps & KVA vary from around
60% to 70%, Starting Torque from around 45% to 50%. The motor can start a fully loaded pump if it has no large torque dip or cusp. See the text discussion on Part Winding Starting for details.
(c) Figures are for tap set at 65% which yields a motor voltage of 65% of line (mains) voltage. (d) The Dual Figures are for Starting and Transition. The transition values are to finish
accelerating a fully loaded pump. Examples include deluge or open systems, re-starting a fully loaded pump after a power failure or interruption, and failure of another pump feeding the same system.
(e) Ignores the momentary transition resistor loads. (f) Varies with pump load and particular Soft Starter used. Values shown are initial and
maximum for a typical fully loaded pump. MCS uses the second (Start) contactor for isolation. Others use only the Bypass contactor.
(g) The 46% Starting Amps & KVA figures include the Autotransformer exciting current.
50
7 - Rough Rules of Thumb Transformer or Gen-Set Sizing – 125% almost never
enough Full Voltage (A-T-L) Starting
Often needs 300% to 500% Sizing Reduced Inrush Starting
Often needs 250% to 400% Sizing Depending on:
Device Impedance and Voltage Drops of: Transformer Source and Primary
Wiring Run and Wiring Run to Controller Sizing for Variable Speed depends on Bypass Start
method.For More info. see: mastercontrols.com/EngInfo/Articles/Nasby/Motor-Starting-
Parameters_WP0.pdfFrom: mastercontrols.com/AboutFPC/MCSldA00.htm And: mastercontrols.com/EngInfo/MCEngInf.htm#TechArts
Why not to specify Wye-Delta Starting:mastercontrols.com/EngInfo/Articles/Nasby/Wye-Delta_Starting_White_Paper.pdf
51
Variable Speed Case StudiesApplication for Variable Speed Pumps: 6) High Rise and Warehouse Systems 7) Horizontal and Vertical Fire Pumps8) Combined Fire and Domestic Water
Systems9) Requirement for Successful
Installations
52
6 - High Rise and Warehouse Systems
53
High Rise and Warehouse Systems - cont'd
Fire Pump CurveVarious Pump Speeds
020406080
100120140160
0 500 1000 1500 2000
Flow - GPM
Pre
ss
ure
- P
SI
100% Speed 90% Speed 80% Speed
Fire Pump & Water Supply Curves
0
50
100
150
200
250
0 500 1000 1500 2000Flow - GPM
Pre
ssu
re -
PS
I
System Curve Fire Pump Water Supply
Pressure Variables
Pump Pressure ~ RPM Squared
54
High Rise and Warehouse Systems - cont'd
System CurveVariable Speed Drive
0
50
100
150
200
250
0 500 1000 1500 2000Flow - GPM
Pre
ssu
re -
PS
I
System Curve Variable Speed
Pressure Set-Point
(Set Pressure)
Feedback Control System (PID Loop) "limits" the pressure by "flattening" the curve to the desired set pressure by controlling the pump speed.
55
High Rise and Warehouse Systems - cont'd
Note that Note that allall pumps are pumps are allowed to have a 40% rise allowed to have a 40% rise
to churn (Shutoff).to churn (Shutoff).
Set-point (PID) control compensates for pressure variations in:
1) Suction Supply
2) Pump Inlet Friction Loss
3) Pump Curve
It does not compensate for discharge & system piping friction loss since pressure is sensed at the pump discharge.
Note that by the time the pressure drops below the Note that by the time the pressure drops below the Set Pressure, the pump will be running at Set Pressure, the pump will be running at Full SpeedFull Speed..
56
High Rise and Warehouse Systems - cont'd
For best economy, For best economy, use the use the most efficientmost efficient pump to reduce the pump to reduce the horsepower required. horsepower required.
A flat pump curve A flat pump curve does notdoes not help the controller control pressure. help the controller control pressure.
The pump curve The pump curve must bemust be monotonic (no rise in the pump curve). monotonic (no rise in the pump curve).
Note motor Inverter Duty Label.
57
High Rise and Warehouse Systems - cont'd
Variable Speed Pump Mitigates Pressure Loss between Pump House and buildings.Variable Speed Pump Mitigates Pressure Loss between Pump House and buildings.
58
High Rise and Warehouse Systems - cont'd
2500 Gpm Test Flow
1,500,000 Sq.Ft. Distribution Center
250 Hp 2500 Gpm Pump
Serious Supply Pressure Variation
59
7 - Horizontal and Vertical Fire Pump Examples Horizontal Split Case Vertical In-Line Vertical Turbine Deep Well Vertical Turbine
60
Horizontal and Vertical Fire Pump Examples - cont'd
A large College Campus Education Building (Sprinkler Retrofit).A large College Campus Education Building (Sprinkler Retrofit).
61
Horizontal and Vertical Fire Pump Examples - cont'd
Same College Campus, Different Education (Also Retrofit)Same College Campus, Different Education (Also Retrofit)
62
Horizontal and Vertical Fire Pump Examples - cont'd
The College BuildingsThe College Buildings
63
Horizontal and Vertical Fire Pump Examples - cont'd
125 Hp deep well dual use vertical turbine pump125 Hp deep well dual use vertical turbine pump
64
Horizontal and Vertical Fire Pump Examples - cont'd
125 Hp deep well dual use pump125 Hp deep well dual use pump
65
Horizontal and Vertical Fire Pump Examples - cont'd
100 Hp Vertical In-line pump100 Hp Vertical In-line pump
66
8 - Combined (Dual Use) Systems Water Supplies
MunicipalDeep Well
Types (Purpose)Domestic and Fire WaterProcess Water for Heat Pumps
Back-up Fire Water (Must Have)Multiple Pumps w/ Municipal SourceMultiple WellsWell & Tower
67
Combined (Dual Use) Systems - cont'd Optional Multiplexing (Must be
Independent)Variable Speed Jockey Pump
Alternate Between Pumps
Tower Re-fill (Domestic Water) Optional Additional Control - Pressure
Switch &Remote Fire Signal Start
Building (Campus) Control System (speed control)
68
Combined (Dual Use) SystemFire and Domestic Water
Very Large Mall
Domestic and Fire Water
(Backup for Domestic)
Four Pumps
2 @ 30 Hp (VIL)
2 @ 60 Hp (HSC)
T-Switch Controllers
Triplexed (Lead-Lag)
With Interlocked Backup
Pressure & Fire Signal (Remote) Start on Lead
Pump
(Sports Store Ammunition Storage)
69
Combined (Dual Use) SystemFire and Domestic Water
70
Triple Dual Use SystemFire, Domestic & Tower Refill
Near MinneapolisWater Treatment Room
71
Triple Use System
Very Medical Housing Campus
Domestic & Fire Water & Tower Refill
Deep Well Pump
125 Hp 1250 GPM
Triple Controller Control
1) Pressure Start Based on Tower Water Level
2) Fire Alarm System Start and Full Speed Run
3) Campus Control System controls speed for best water treatment (300
to 400 gpm for tower refill daily.
Note: Tower limits campus water system pressure (tower overflows).
72
Dual Use Fire and Domestic Water
DOD Approved Very Large Many Building Military Installation - 3 Pumps:
Variable Speed Motor Drive, Diesel PLD Drive & VFD Jockey Pump
73
Dual Use Fire and Domestic Water
125 Hp Controller with Dual Coolers
Low Suction, Low and High System Pressure Alarms
Note Alarm Set:
Used to consolidate Tamper Signals to
Fire Pump Controller which
feeds a Radio Link Alarm System
74
Dual Use Fire and Domestic Water
Two sets of Dual Relief Valves (one Set to Waste the other Bypasses) Coordinates with several other pump rooms and fire pumps.
75
9 - Requirement for Successful Dual-Use Installations Back-up Fire Water Supply Careful Analysis and System Design Suitable Controller(s) - See Section 4
Careful Attention to Pressure Settings
Flexible and Robust PID Loop
Proper Sequencing &Multiplexing Between Pumps
Fully Independent Control Proper Installation - See Section 4 Training of Personnel
76
Requirement for Successful Dual-Use Installations - cont'd
Automatic sequencing of pumps required in accordance with 9.6.3 (and required by 10.5.2.5).
Note: This eases the starting electrical load. Automatic sequencing of fire pumps
needed for pumps in parallel or in series- Any pump supplying suction to another pump starts before it (High Zone Delayed Start) -or- - If water requirements call for more than one pumping unit to operate (pumps in parallel)- Pumps must start at intervals of 5 to 10 seconds- Failure of any pump may not prevent any others from starting
77
NFPA-20 2007 Chapter 9Electric Drive for Pumps - Cont'd
Motor Starting Slide Show Links:mastercontrols.com/EngInfo/Articles/Nasby/EFPXS-2B_WP5.PDFmastercontrols.com/EngInfo/Articles/Nasby/Motor-Starting-
Parameters_WP0.pdf
mastercontrols.com/EngInfo/Articles/Nasby/Wye-Delta_Starting_White_Paper.pdf
mastercontrols.com/ProdInfo/Flyers/ECV_Application_Notes-Iss4.PDF
Above from: mastercontrols.com/EngInfo/MCEngInf.htm#TechArts
mastercontrols.com/EngInfo/Articles/Nasby/Handouts/Motor_Starting/Session_321-2_Supplemental-Handout.PDF
Above from: mastercontrols.com/AboutFPC/MCSldA00.htm
This Show:slideshare.net/JamesSNasby/fire-pump-system-pressure-control