Sunday, May 17, 2015 Pressure Booster Service. Sunday, May 17, 2015 Booster Service Basics Control...
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Transcript of Sunday, May 17, 2015 Pressure Booster Service. Sunday, May 17, 2015 Booster Service Basics Control...
Tuesday, April 18, 2023
Pressure Booster Service
Tuesday, April 18, 2023
Booster Service Basics
• Control Panel Components• Setting a pressure switch• Setting a current relay• Adjusting the Easy PLC Relay• Understanding and Adjusting a PRV
Tuesday, April 18, 2023
Control Panel Components• High Voltage:
Disconnect, Starters, Overloads, Transformer
• Low Voltage: Current Relays, PLC, pressure switches
Tuesday, April 18, 2023
Setting Overloads
• Factory Set• Verified in the field
Tuesday, April 18, 2023
Pressure Switch Basics
• Pressure switches have a Set Point and Re-Set• Re-set value always below the Set Point • Set Point and Re-Set are dependant on the
purpose of the pressure switch
Tuesday, April 18, 2023
Pressure Switch Adjustment
Set Point Adjustment
Differential Adjustment
PSI Scale Reading
Tuesday, April 18, 2023
Pressure Switch Adjustment
• Differential Setting 4-150 Psig switch
Differential adjustment A B C D E F G H I J K L
Approximate value (PSI) 0.75 1 1.5 2 5 10 15 20 25 27 32 35
• Differential Setting 6-250 Psig switchDifferential adjustment A B C D E F G H I J K L
Approximate value (PSI) 1 1.5 2 5 10 15 25 35 45 50 55 60
Tuesday, April 18, 2023
Pressure Switch Applications
• Low suction pressure protection• No-Flow shutdown pump call on• Pump sequencing control• High and low pressure alarms
Tuesday, April 18, 2023
Low Suction Pressure Protection
• Purpose: Stop pump in case of low inlet pressure
• Set Point (Cut-In): 15 PSI - Pump Start• Re-Set (Cut-Out): 5 PSI - Pump Stop• differential: 10 PSI
Tuesday, April 18, 2023
No-Flow Shutdown Pump Call-On
• Purpose: Start pump on drop in system pressure
• Set Point (Cut-Out): 5 PSI below system pressure - Pump Off
• Re-Set (Cut-In): 6 PSI - Pump On• differential: 1 PSI
Tuesday, April 18, 2023
Pump Sequencing Control• Purpose: Start pump on drop in system
pressure• Set Point (Cut-Out): 5 PSI above system
pressure - Pump Off• Re-Set (Cut-In): 5 psi below system pressure -
Pump On• differential = (cut- in) - (cut - out)
Tuesday, April 18, 2023
High Suction Pressure Alarm
• Purpose: Stop pump if inlet pressure is sufficient to supply building
• Set Point (Cut-Out): @ approx. system pressure - Pump Off
• Re-Set (Cut-In): approx. 5-10 PSI below system pressure - Pump On
• differential: 5-10 PSI
Tuesday, April 18, 2023
Low System Pressure Cut-Out Alarm
• Purpose: Stop pump if outlet pressure is too low
• Set Point (Cut-In): approx. 5-10 PSI below system pressure - Pump On
• Re-Set (Cut-Out): 30 PSI below system pressure- Pump Off
• differential: 20-25 PSI
Tuesday, April 18, 2023
Low System Pressure Next Pump Starts Alarm
• Purpose: Start next pump if outlet pressure is too low. Requires manual reset
• Set Point (Cut-In): approx. 5-10 PSI below system pressure - Pump On
• Re-Set (Cut-Out): 30 PSI below system pressure - Pump Off
• differential: 20-25 PSI
Tuesday, April 18, 2023
High System Pressure Cut-Out Alarm
• Purpose: Stop pump if outlet pressure is too high
• Set Point (Cut-Out): 20 PSI above system pressure - Pump Off
• Re-Set (Cut-In): System Pressure - Pump On• differential: 20 PSI
Tuesday, April 18, 2023
Current Relay Adjustment
Tuesday, April 18, 2023
Current Relay Adjustment
• On-Delay Time Scale (0-1) & (0-30)
Tuesday, April 18, 2023
Current Relay Adjustment
• On-Delay Time Setting
Tuesday, April 18, 2023
Current Relay Adjustment
• Threshold (Ie Value)
Tuesday, April 18, 2023
Current Relay Adjustment
• Hysteresis - not used - set to zero
Tuesday, April 18, 2023
Easy PLC Relay
Tuesday, April 18, 2023
Easy PLC Relay
• Contains sequencing logic for pump sequencing
• Alarm condition activation• Timer values
Tuesday, April 18, 2023
Easy PLC Relay
• Program written in ladder logic• Program changes require a programming
device• Does not require in-field adjustment• Program access is password protected
Tuesday, April 18, 2023
Setting Timer• Select
parameters • Toggle timer
value required• Change timer
value by pressing arrow
Tuesday, April 18, 2023
Understanding and Adjusting PRV
Tuesday, April 18, 2023
PRV Components
Main Body Valve
Piloting Assembly
Tuesday, April 18, 2023
PRV ComponentsPressure Regulator
Speed Control
Check Valve
Check Valve
• Diaphragm
•Stem assembly
•Sealing Ring
•Valve Seat
Tuesday, April 18, 2023
PRV Control Logic
• Outlet pressure of the valve is controlled by the pilot mounted PRV
• Spring setting in PRV pilot determines outlet pressure of the main PRV
• Turning PRV nut clockwise (down) will cause outlet pressure of main valve to increase
Tuesday, April 18, 2023
PRV Control Logic
Small Area
Large Area
Tuesday, April 18, 2023
PRV Control Logic
Opening the pilot relieves pressure on top of the diaphragm opening the main valve.
CHECK CLOSED
CHECK CLOSED
Tuesday, April 18, 2023
PRV Control Logic
Closing the pilot increases pressure on top of the diaphragm closing the main valve.
CHECK CLOSED
CHECK OPEN
Tuesday, April 18, 2023
PRV Control Logic
• Check Valves in piloting circuit ensure valve closes and stays closed when pumps stop and the pressure reverses
CHECK CLOSED
CHECK OPEN
Tuesday, April 18, 2023
PRV START UP
• Bleed air off Main Cover & Controls• Start system with pilot valve adjusted to lower
than required value• Adjust to higher pressure as system stabilizes • Make all adjustments slowly, allowing for the
control valve and system to balance the change
Tuesday, April 18, 2023
PRV TROUBLESHOOTING
• Irritants to PRV operation– Dirt, Sand, obstructions of any kind– Air entrapment or entrainment into valve body– Damaged or worn parts– Humans
Tuesday, April 18, 2023
Types of Problems
• PRV’s will not regulate• PRV’s will not hold pressure • Non operating pump spins when off• Pilot valve leaks
Tuesday, April 18, 2023
PRV TROUBLESHOOTING conditions
• Valve will not regulate– Air in control Pilot– Closing speed control not adjusted properly– Clogged strainer or Pilot Valve– Faulty Pilot– Valve stem is jammed in cover bearing – Diaphragm failure
Tuesday, April 18, 2023
PRV TROUBLE SHOOTING conditions
• Valve will not hold pressureBecause of:– Strainer is clogged– Check valve not sealing – Faulty pilot– Insufficient Supply Pressure
Tuesday, April 18, 2023
Types of Problems
• Non operating pump spins when off– PRV check valves not sealing properly– PRV diaphragm broken– Check valves not sealing
Tuesday, April 18, 2023
Types of Problems
• Pilot valve leaks– Pilot diaphragm broken
Tuesday, April 18, 2023
Types of Problems
• Power on - pumps don’t come on• Pumps on - don’t shut off• Pumps come on too soon• Pumps do not stay off for a long time on No-
flow shut down• Pumps short cycle
Tuesday, April 18, 2023
Types of Problems
• Power on but pumps don’t come on– Motor overloads tripped– Check inlet pressure and low suction pressure
switch, high suction pressure switch– Check no-flow pressure switch– Check discharge pressure and low discharge
pressure switch
Tuesday, April 18, 2023
Types of Problems
• Pumps on - don’t shut off– Verify current relay settings– Verify alarm conditions (high Suction pressure, low
system pressure, etc..)– Verify No-Flow shutdown - Aquastat and pressure
switch setting
Tuesday, April 18, 2023
Types of Problems
• Pumps come on too soon– Verify motor current against factory test data– Verify current relay settings
Tuesday, April 18, 2023
Types of Problems
• Pumps do not stay off for a long time on No-flow shut down– Verify tank pre-charge– Adjust Aquastat setting– Adjust call on pressure setting lower– Verify tank bladder is not broken
Tuesday, April 18, 2023
Types of Problems
• Pumps short cycle – Check timer settings– Verify that the Aquastat setting is correct– Adjust pressure switch – Adjust current relay setting– Verify alarm pressure switch settings
Tuesday, April 18, 2023
Booster Application Knowledge
• 2 pump system recommended for flows up to 300 GPM
• 5 step sequencing recommended for systems over 500 GPM
• Do Not install No-flow shutdown units on continuous demand systems
Tuesday, April 18, 2023
Booster Application Knowledge
• Booster systems are designed to have a positive supply pressure
• PRV’s are not required when drawing from a tank using single stage pumps
• Tank pre-charge should be set at 5 PSI less than the call on pressure switch setting
Tuesday, April 18, 2023
Questions & Answers
Tuesday, April 18, 2023
Thank You