fire irrig ps
DESCRIPTION
civil engineerTRANSCRIPT
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Combined Fire-fighting/Irrigation Pumping Stations Design and Control Philosophy
Clare Edwards
Thursday 6th September 2007
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Introduction
• Fire/Irrigation Pumping Stations
• Fire/Potable Water Pumping Stations
– What we’re given
– What we produce
– Pumping station
– Standards
– Control Philosophy
– Problems encountered
– Summary
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Potable/Firefighting - GM University
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Irrigation/Firefighting - UAQ Marina
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Information We’re Given
• Users
• Flow
• Pressure at point of discharge
• Network – distances
• Location – sometimes not always known e.g. Lusail
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Water Users & Pressure Required
Potable Water Supply
• Potable only
• ~ 4 bar (58 psi)
Fire Fighting
• Potable or treated effluent
• ~ 7 bar (102 psi)
Irrigation
• Treated effluent
• ~ 4 bar (58 psi)
District Cooling
• Treated effluent
• ~ 4 bar (58 psi)
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What we Produce
• M&E specifications – specifying equipment, pumps, mechanical
equipment– a standard document that is changed edited for
the purposes of the project– includes pump curves, datasheets, panel
dimensions, etc
• Calculations – Size of pipes, headloss calculations, motor sizing,
thrust on pipe calculations, power load, any further calculations required
• Drawings – P&ID, SLD, GA showing pipe layout, sections,
pipe schedules, roof/access layout
• Control Philosophy – how we propose to operate & control the system
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Calculations
• Pipe sizing– Q = vA
• Headloss Calculations – Colebrook-White formula
• Motor Sizing Calculation– P = gHQ /
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Example
• Q = 620 l/s
• HT = 80m
• Combined Fire/Irrigation
• Pressure at hydrant
• Maintain 2 hours storage for fire event
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Pipe Size & Headloss Calculation
• E.g. Irrigation pump, velocity in pipe<2m/s
• No of pumps required– D/A/A/S => Duty, Q = 207l/s (620/3)
• Try Dia = 400mm
• => A = 0.4²/4 = 0.12m²
• V = Q/A => 0.207/0.12 = 1.65m/s
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Pipe Velocities
• 350 dia => 2.15m/s
• 400 dia => 1.65m/s
• 500 dia => 1.05m/s
• 600 dia => 0.73m/s
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Headloss Calculation
• Use Colebrook-White to calculate headloss in pipe– Length & diameter of pipe– Flow => velocity– Fittings
• HL= kV²/2g
• HF =
• HT =
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Motor Sizing Calculation
• P = gHQ /• P = (1000kg/m² x 9.81m/s² x 80m x0.207m³/s)/ 0.8• P = 203kW + 10% design headroom
• kW => type of starter
• DEWA recommendations– 0-11kW DOL– 15-22kW Star-Delta– 30+ kW Soft Start
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Pumps
• Electric Pump with diesel backup/diesel generator backup
• Irrigation Pump/s with jockey pump/s
• Centrifugal pumps (split casing type)
• Vertical multistage
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Pump Selection
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General Arrangement – Pipe Layout
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Process & Instrumentation Diagram P&ID
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P&ID (cont)
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Single Line Diagram
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Main Components
• - storage tank/reservoir – level sensors
• - pump room
• - FEP, FDP, Irrigation pumps, (Potable pumps), jockey pumps
• - valves – flow control and isolation
• - flow meter – to test pump flow rates
• - surge vessel – maintain system pressure
• - (strainers)
• - lifting equipment – overhead bi-directional crane
• - generator, MCC, transformer, mess rooms/building
• - fuel tank
• - standby generator
• - AC and ventilation
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Standards – NFPA20
• NFPA 20
– National Fire Protection Association's (NFPA)
– American standard adopted in the UAE
– NFPA 20 Standard for the Installation of Stationary Fire Pumps for Fire Protection
• Key points:– Pumps limited to capacity < 1892 l/min
– PRV
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Standards – FM/UL Approved
• FM - Factory Mutual • UL – Underwriters Laboratory
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Control Philosophy
• Instruction on how pumping station will operate
– state set points;
– pressure pumps are to maintain the system at;
– how the pumps will operate, e.g. D/A/A/S
– what controls are needed
• Control Philosophy and P&ID is then given to the electrical engineer to complete the SLD, panel layout, and work out electrical loads and power required, size standby generators, etc
• Control Philosophy to be read in conjunction with P&ID
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Control Philosophy Assumptions
• Irrigation pumps to operate on demand,
• Jockey pumps to maintain system pressure
• Irrigation networks under central control
• Each branch of network can be isolated (normal condition) or opened when irrigation is required.
• Valves centrally controlled
• Irrigation system controlled by a 24 hour timer
• A PRV to protect pumps and pipework against over pressure.
• Back up diesel generator – for mains power failure
• Sufficient fire-fighting water must be available at all times Hard-wired level sensor in tank to inhibit irrigation pumps
• Flow control valve provided on inlet to storage tank/reservoir.
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Actions in event of fire
Fire hydrant opened
Fire pumps start Irrigation & district cooling offtakes close
Detect that fire hydrant has been opened
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Variations
• GM University
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GM University – Potable/Firefighting
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Problems
• Strainers on suction pipework
• D/S strainers requested when the tank and pumping station
• Determining what Civil Defence wants?
• Surge vessels
• Pipe thrust block design
• Ensuring pipework is tied down
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Summary
• Good examples of design from various projects
• However….
• …we’re constantly working and improving on the design
• The most important thing is determining what the civil defence requirements are and confirming the design criteria as early as possible
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Pump Room Overview
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Electric Fire Pump
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Diesel Fire Pump
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Pressure Relief Valve
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Flowmeter
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Autostrainers
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IMPZ, Dubai
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Valve Arrangement
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Surge Tank
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Monorail Crane
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Tied Pipework