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The chart below represents the pressure drop (Ft of Head) versus the water flow rate (GPM) for the P-K
STORM ST-5000 and ST-6000. This information is useful to help size an appropriate circulation pump.
Keep in mind this pressure drop represents the boiler only, additional consideration is needed for any
connecting piping, valves, strainers, couplings, flanges, etc.
40
35
30
25
20
15
10
5
0
0
25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475 500 525 550 575 600 625
ST-5000 & ST-6000 Boilers: Minimum & Maximum Flow Rates
Flow
Boiler
Condition
Operation
Maximum Flow High Fire
Minimum Flow
High Fire
Minimum Flow
Ignition
Minimum Flow
Low Fire
Revised: December 8, 2021
Released: December 8, 2021
PK STORM ST-5000 & ST-6000
Pressure Drop vs. Flow
MAX FLOW ST-5000
Flow Rate (GPM)
P-K STORM
Flow Rate
ST-5000
485 GPM
161.7 GPM (Flow Switch
Setting)
Patterson-Kelley 2021
All Rights Reserved.
P-K Storm
Technical Service 1.877.728.5351
MAX FLOW ST-6000
@20°F ΔT
582GPM @ 107.8ft
@20°F ΔT
485GPM @ 74.8ft
™
ST-6000
582 GPM
194 GPM (Flow Switch
Setting
2691000273 P-K Storm ST2500-ST6000
Installation and Owners Manual Rev C.docx
TM
Gas Fired Boiler
Approximate
ΔT
20 °F
60 °F
Page 121
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