HPN & Multi-Pump Pressure Systems
Constant pressure on every floor — and the line pressure to prove it.
Gravity from a terrace tank gives the top floor a dribble and the ground floor a fire hose. A hydro-pneumatic set fixes that by holding one pressure across the whole building — but a pressure set that nobody monitors is a black box with three motors in it. Metering the line pressure is what turns it into a system you can actually run.
Hydro-pneumatic system · booster pump automation · constant pressure · line pressure monitoring · BMS
What makes it work
The parts of the diagram above that are doing the real work.
PID control, not on/off
A pressure transmitter on the header feeds a PID loop that holds your setpoint continuously — correcting for how far off it is, how long it has been off, and how fast it is moving. That is what a shower feels as steady pressure instead of a pump hunting between a cut-in and a cut-out.
VFD: speed instead of switching
The drive trims pump speed to match demand rather than slamming a motor on and off. Softer starts, less wear, and no pressure spike at every changeover. Output frequency, drive faults and running hours are all readable in the app alongside everything else.
Pumps in parallel, duty rotated
Two or more pumps share common suction and discharge headers. As demand rises the next pump cascades in; as it falls, that pump drops back out. Lead duty alternates so the set wears evenly, and a healthy pump stands by for one that faults — nobody discovers the standby had seized on the day it was needed.
How it is done
Every step below is a retrofit on the system you already have — no replacement pumps, no civil work.
- 1
Meter the header
A pressure transmitter on the system line reports live pressure in bar, continuously. That single reading is what the whole set is judged by, and it is the first thing the app shows you.
- 2
Cascade on demand
As demand rises and pressure sags, the next pump cuts in; as demand falls, it drops back out. The building sees one steady pressure instead of a pump hunting between extremes.
- 3
Rotate duty, keep a standby
Lead duty alternates between machines so they wear evenly, and a healthy pump stands by for one that faults — nobody finds out the standby was seized when the duty pump fails.
- 4
Watch the trend, not just the number
The app plots line pressure through the day and logs every changeover, so a set that is starting to struggle shows up as a trend long before it becomes a complaint from the top floor.
What it takes
- Pressure transmitter on the system header for live line pressure
- Two or more pumps, each on an APCON smart driver
- Pressure vessel sized to the set
- The Devyami app for live pressure, lead/lag status and changeover history
What you get
- Constant pressure from the ground floor to the top floor
- Live line pressure in bar, with a trend through the day
- Even wear across the set through automatic duty rotation
- Every cascade and changeover logged — BMS-grade visibility for the pump room
Questions, answered
Why monitor line pressure if the system already controls it? ＋
Because control tells you what the set intended and monitoring tells you what the building got. A pressure trend that sags a little more each week is a set losing capacity — a failing pump, a waterlogged vessel, a clogging line — and it is visible weeks before anyone on the top floor complains.
Does duty rotation actually matter? ＋
Yes. Without it the lead pump does all the work and fails years before its standby, which has meanwhile seized from never running. Rotating duty spreads the hours and exercises every machine, so the standby actually works on the day it is needed.
The rest of the system
Every capability runs on the same controllers, the same app and the same live data.
Accurate Tank Level Monitoring
Two ways to read a tank — non-contact ultrasonic on the lid, or a contact hydrostatic level transmitter hanging in the water. Both report live percent and litres, warn you before an overflow or an empty tank, and feed the same reading the controller switches your pumps on.
How it is done →Digital Flow Monitoring & Water Metering
Digital flow meters turn every pipeline into a number you can manage: litres pumped today, consumption per wing or per site, and totals you can export. Water metering is also your leak detector — flow at 3 AM when everyone is asleep is a leak announcing itself.
How it is done →Hot Water Circulation
A monitored circulation loop keeps hot water at every tap the moment it opens — no running the shower cold for a minute. The app watches loop temperature, runs the circulation pump only when needed, and coordinates heat pumps and geysers so comfort never fights efficiency.
How it is done →Pump Status, Control & Protection
Every pump shows its truth in the app: running or stopped, current, voltage and run hours — and a Start/Stop that works from anywhere. Underneath, the APCON motor driver protects against dry run, overload, phase failure and voltage faults, whether or not your phone is in the room.
How it is done →Timer & Scheduler — Irrigation & Fountains
Garden irrigation, landscape zones and fountains run to a schedule you set once from your phone: start time, run duration, which days, which zone. The controller keeps time locally, skips a cycle when the tank is too low to spare the water, and logs every run.
How it is done →Want hpn & multi-pump pressure systems on your site?
Tell us what your pump room looks like today — we design, retrofit and stand behind the whole system.