Multistage pressure booster sizing, supply, installation and commissioning for 20-storey condos in the Philippines: head math, pressure zoning, VFD duplex sets, quote in 1 day.
What a 20-storey condominium demands from a pressure booster
A 20-storey residential tower is the point where a simple packaged booster stops being enough. Water is normally stored at ground or basement level, and the booster has to lift it to the highest fixture on the top floor while still leaving usable pressure at the shower head.
Worked head calculation for a 20-storey tower
Total dynamic head for a booster is the sum of three numbers: static lift, friction loss, and residual pressure at the highest fixture. Here is that arithmetic on an illustrative 20-storey condominium, using assumptions you should replace with your own drawings. Static lift: 20 floors at 3.0 metres floor-to-floor gives 60 metres from the basement pump room to the top-floor fixture. Friction loss: on a riser of that length, plus valves, elbows, meters, and the horizontal run from the tank, allow roughly 10 to 15 metres. Residual pressure: residential fixtures need real pressure left over at the outlet, so confirm the target with your plumbing consultant and carry it as a line item rather than an afterthought. Adding those gives a duty point in the region of 90 metres of head. For flow, tally water supply fixture units per the National Plumbing Code of the Philippines (NPCP) and convert using the code's fixture-unit-to-flow table, which is deliberately non-linear because not every fixture opens at once: as an illustrative example consistent with NPCP-style fixture-unit tables, a tower of roughly 160 residential units typically lands near 70 to 80 cubic metres per hour of peak simultaneous demand. Motor power follows from flow times head divided by 367 times pump efficiency. Cross-check the result against the pump curve, not just the catalogue heading; the full method is in our guide on how to size a booster pump for a commercial building. Our CDL and CDLF vertical multistage range (0.37 to 200 kW) is sized to the duty point after that sizing check, rather than sold off a fixed catalogue ceiling.
One pressure zone or two: the zoning decision above 15 floors
Once a tower passes about 15 floors, you have to decide whether one booster serves everything or the building is split into pressure zones. The problem is not the top floor, it is the bottom. If a single set generates the roughly 90 metres of head the 20th floor needs, the ground-floor and podium fixtures see that same column of water minus almost nothing, which means burst supply hoses, screaming taps, blown cartridges, and a maintenance backlog that lands on the property manager. There are two workable designs. The first is a single booster set sized for the top zone with pressure reducing valves fitted at the lower floors, which is simpler to install, cheaper up front, and pushes the ongoing cost into PRV maintenance and the energy wasted throttling pressure you paid to create. The second is split zoning: a low-zone set covering roughly floors 1 to 10 and a high-zone set covering floors 11 to 20, each sized to its own static lift. Split zoning costs more in equipment and pump room space but runs closer to each zone's best efficiency point and removes most of the PRV count. Which one is right depends on your riser layout, whether a transfer tank exists at a mid-level plant room, and your energy versus capital preference. Send us the riser diagram and we will price both so the comparison is on paper before anyone commits.
Booster set configuration: duplex, triplex, VFD control, and the pressure vessel
A condominium booster is three things bought together, and mismatching them is the most common cause of a bad install. First, pump count. Duplex (two pumps) is the normal configuration at condominium flow rates and lets you run duty and assist through the morning peak, or duty and standby overnight. Triplex is worth it on larger towers where you want a genuine standby pump still available while two pumps carry the peak, so a single failure never drops building pressure. Second, control. We supply and install VFD duplex pump control panels, built with industrial-grade drives, with alternation so run hours spread evenly across pumps, soft ramp to stop the riser hammering, and constant pressure regulation off a discharge transducer; whether the drive pays for itself is covered in VFD versus fixed speed pumps. The panel is where the reliability actually lives, and it is why we treat it as an engineered item rather than a commodity add-on. Third, the hydropneumatic pressure tank. A diaphragm vessel absorbs small draw-offs so the pumps are not started for one flushed toilet at 2 a.m., which is what protects motor and contactor life over years rather than months. We supply, install and commission all three under one contract so responsibility for the duty point and the install quality never gets split across separate vendors. If the tower's ground or roof storage also needs replacing or expanding, TankSmith's FRP modular tank line uses WRAS-certified panels and can be sized, supplied and installed alongside the booster set under the same contract.
Pumps, panels, and certifications we supply and install for high-rise boosters
TankSmith is a Philippines-based turnkey installer of modular water tank systems and matching pressure booster pump systems. We size, supply, install and commission both the storage side and the pressure side under one contract, so the tank design, the pump duty point, and the control panel are engineered together instead of being split across separate orders. On the pump side we supply, install and commission our CDL and CDLF vertical multistage booster series, built in SS304 wetted parts across a 0.37 kW to 200 kW range, which covers condominium potable water service with margin to spare. Replacing a booster on a live tower follows the same sizing process described above: send us the existing pump's nameplate and the riser details and we will quote a drop-in multistage replacement engineered to the same duty point, installed and commissioned by our own team rather than handed off to a separate contractor. On documentation, the equipment we supply carries ISO 9001 manufacturer quality management system certification and TUV SUD testing, with CE marking on electrical items, and the FRP panels in our modular tank line are WRAS certified for potable water service up to 65 degrees Celsius. We deliver, install and commission nationwide across NCR, Luzon, Visayas, and Mindanao, including PEZA, SBMA, and Clark locators, with local warranty and after-sales support.
Lead times, VAT treatment, and what to send us for a sizing check
Pricing is quote-based and we do not publish prices, because the duty point, pump count, panel rating, and vessel size move the number too much for a list price to mean anything. What we can commit to is turnaround: we respond to RFQs within 1 business day. Standard lead times are 21 to 35 days for ex-stock configurations and 45 to 90 days for made-to-order sets, so a booster replacement on a live tower should be started at least a quarter before the target changeover date. On tax, 12 percent VAT applies to VAT-registered buyers, and Zero-VAT treatment applies to PEZA and SBMA locators and to exporters, so tell us your registration status up front and the quotation will reflect it correctly the first time. To get a sizing recommendation rather than a generic catalogue reply, send us five things: the number of floors and the floor-to-floor height, the unit count and fixture schedule or the plumbing riser diagram, the location and capacity of the existing storage tank, a photo of the current pump room including the nameplate of any pump being replaced, and whether the building already has pressure zoning or PRVs installed. With those five items we can return a duty point, a recommended configuration, and a priced supply-and-install package, commissioned by our own team on handover.
Frequently Asked Questions
Work it as static lift plus friction loss plus residual pressure at the highest fixture. At a typical 3.0 metre floor-to-floor height, 20 floors gives about 60 metres of static lift, a riser of that length with valves and fittings usually adds 10 to 15 metres of friction, and you then add the residual pressure your plumbing consultant specifies at the top-floor outlet. That commonly lands near 90 metres of total dynamic head. Always confirm against the actual pump curve. Send us your riser diagram and floor heights and we will compute the duty point for you.
A multistage pump stacks impellers in series inside one casing, so each stage adds head without adding flow. That is exactly what a tall building needs: high pressure at moderate flow. End-suction and jet pumps run out of head long before 60 metres of static lift, so meeting a 20-storey duty point with them means either an oversized motor running badly off its best efficiency point or a staged pumping arrangement you did not budget for. Our CDL and CDLF vertical multistage range (0.37 to 200 kW) is sized to the duty point after a sizing check, confirmed case by case against the pump curve rather than read off a fixed catalogue envelope.
Both work, and the trade-off is real. One booster sized for the top zone is simpler and cheaper to install, but the lower floors then need pressure reducing valves, which adds maintenance and wastes energy throttling pressure you paid to generate. Splitting into a low zone (roughly floors 1 to 10) and a high zone (floors 11 to 20) costs more in equipment and pump room space but runs each set nearer its efficiency point and cuts the PRV count sharply. The right answer depends on your riser layout and whether a mid-level plant room exists. We quote both so you can compare on paper.
Duplex is the normal configuration at condominium flow rates: two pumps running duty and assist through the morning peak, or duty and standby overnight. Triplex is worth the cost on larger towers where you want a genuine standby still available while two pumps carry the peak. A VFD is strongly recommended either way, because condominium demand swings from near zero overnight to a sharp morning peak, and fixed-speed control responds to that by cycling and hammering the risers. We supply, install and commission VFD duplex control panels with industrial-grade drives, including pump alternation and constant pressure regulation.
Standard lead times are 21 to 35 days for ex-stock configurations and 45 to 90 days for made-to-order sets, so start a live-building replacement at least a quarter ahead of your target changeover. We respond to RFQs within 1 business day. Pricing is quote-based and we do not publish prices, since duty point, pump count, panel rating, and vessel size all move the figure. On tax, 12 percent VAT applies to VAT-registered buyers, and Zero-VAT applies to PEZA and SBMA locators and to exporters. Tell us your registration status with the enquiry and the quotation will be correct on the first pass.
Five items get you a real sizing recommendation instead of a catalogue reply: the number of floors and floor-to-floor height, the unit count with fixture schedule or the plumbing riser diagram, the location and capacity of the existing storage tank, a photo of the current pump room including the nameplate of any pump being replaced, and whether pressure zoning or PRVs are already installed. From those we return a computed duty point, a recommended pump and panel configuration, and a priced supply-and-install package. We deliver, install and commission nationwide across NCR, Luzon, Visayas, and Mindanao, including PEZA, SBMA, and Clark.
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