Patterson-Kelley STORM ST-2500 Installation & Owner's Manual page 100

The chart below represents the pressure drop (Ft of Head) versus the water flow rate (GPM) for the P-K
STORM ST-2500 through ST-4000. 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.
30
25
20
15
10
5
0
0 20 40
™
P-K STORM
Flow Boiler
Condition Operation
Maximum Flow High Fire
Minimum Flow High Fire
Minimum Flow Ignition
Minimum Flow Low Fire
Revised: June 26, 2020
Released: June 26, 2020
P-K STORM ST-2500 - ST-4000
Pressure Drop vs. Flow
MAX FLOW ST-2500
242.5GPM @ 16.9ft
60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400
ST-2500 through ST-4000 Boilers: Minimum & Maximum Flow Rates
ST-2500
242.5 GPM
69.3 GPM
(Flow
Switch
Setting)
© Patterson-Kelley 2020
All Rights Reserved.
MAX FLOW ST-3000
@20°F ΔT
291GPM @ 24.3ft
@20°F ΔT
Flow Rate (GPM)
Flow Rate
ST-3000 ST-3500
291 GPM 339.5 GPM
83.1 GPM 97 GPM
(Flow (Flow
Switch Switch
Setting) Setting)
TM
P-K Storm Gas Fired Boiler
Technical Service 1.877.728.5351
MAX FLOW ST-4000
@20°F ΔT
388GPM @ 25.6ft
MAX FLOW ST-3500
@20°F ΔT
339.5GPM @ 19.6ft
Approximate
ST-4000
388 GPM 20 °F
110.9 GPM
(Flow
60 °F
Switch
Setting)
2691000273 P-K Storm ST2500-ST4000
Installation and Owners Manual Rev A.docx
ΔT
Page 91