Why Hospitals Size Water Storage Per Bed
Bed count is the one number every Philippine hospital project already knows before the mechanical design starts, which is why per bed figures became the default first-pass sizing method. A licensed bed capacity is fixed by the facility's DOH registration, it is available at feasibility stage long before fixture schedules exist, and it correlates reasonably well with the loads that actually consume water: patient bathing and toilets, ward housekeeping, central sterile supply, laboratory, dietary, and linen. Multiply beds by an assumed daily allowance, multiply again by the days of reserve you want to carry, and you have a defensible target capacity. The method has limits. It under-reads for facilities with a large outpatient department, a busy dialysis unit, or in-house laundry, because those loads do not scale with inpatient beds, and it over-reads for a facility running at low occupancy. Treat the per bed number as your starting envelope, then adjust for the departments your hospital actually operates.
Liters Per Bed Per Day: What Figure to Design Around
There is no single universal number, and any supplier who gives you one without qualification is guessing. Industry sizing guidance aimed at full hospital campuses runs high: PHCP Pros, writing for US healthcare campus design, cites 250 to 350 gallons per day per bed, roughly 950 to 1,325 liters per bed per day, a deliberately inclusive figure that absorbs outpatient buildings, central utility plant makeup, and support facilities alongside the wards. Philippine planners working on a single-building facility commonly design to a materially lower allowance covering inpatient and direct support use only. Your governing figure should come from the current DOH Health Facilities and Services Regulatory Bureau Planning and Design Guidelines for your facility class, read together with the National Plumbing Code of the Philippines and any local water district requirement, and confirmed by your mechanical designer of record. Get that number in writing before you procure a tank: a two-fold difference in liters per bed per day is a two-fold difference in the tank you buy, the slab you pour, and the footprint you have to find.
Worked Examples: 50, 100, and 200 Beds
Here is the arithmetic, using an illustrative design allowance of 500 liters per bed per day and a one-day reserve. Substitute your own confirmed allowance and reserve duration; the method does not change. A 50-bed facility at 500 liters per bed per day needs 25,000 liters per day, so a one-day reserve is a 25 KL tank, the scale of our 25 m3 hospital water tank in Cebu configuration. A 100-bed facility needs 50,000 liters per day, so a one-day reserve is 50 KL, matching the 50 m3 hospital water tank in Metro Manila. A 200-bed facility needs 100,000 liters per day, so a one-day reserve is 100 KL, the 100 m3 hospital water tank in Metro Manila scale, and a two-day reserve is 200 KL. Every one of those capacities sits inside the 1,000 liter to 500,000 liter range we install as modular bolted panel systems. Two adjustments matter: if the mains supply into your site is intermittent, carry more than one day, not less; and on a retrofit, the available slab footprint often caps capacity before the calculation does, pushing the design toward a taller, smaller-footprint configuration.
Potable Reserve and Fire Reserve Are Two Different Numbers
The per bed calculation gives you domestic and potable demand. It does not give you fire reserve, and the two should never be quietly merged into a single headline capacity. Fire reserve volume is set by your fire protection design, sprinkler and standpipe demand, and the duration your design basis requires, reviewed against the Fire Code of the Philippines by the Bureau of Fire Protection during permitting. Practically, a hospital ends up with one of two arrangements: two separate tanks, one potable and one fire, or a single tank with the fire reserve protected by drawing the domestic suction off a higher takeoff point so domestic demand physically cannot pull the tank below the fire allocation. The second saves footprint, which matters on a constrained rooftop, but it has to be designed deliberately and shown on the drawings, not assumed. We build hospital systems to the code-compliant fire reserve required by the project's approved design. Bring your fire protection consultant's reserve figure to the sizing conversation; if you only bring bed count, we can size the potable side and will hold the fire side open until that number arrives.
Tank Material for Hospital Potable Storage
Once you know the capacity, material selection is a documentation question as much as an engineering one. We supply modular bolted panels in FRP, GRP and SMC, hot-dip galvanized steel, and stainless steel 304 or 316; full specifications are on the GRP and FRP panel tanks page. For potable storage we specify WRAS-certified water tanks for potable storage, rated up to 65C, with NSF-compliant liners, which is the paperwork an infection control committee or a DOH licensing inspection will ask to see. Panels come from ISO 9001 manufacturer QMS facilities and are TUV SUD tested. FRP panel systems carry a 3-year panel warranty with a 20 to 25 year design life, which suits the replacement cycle hospitals plan around. Stainless steel 304 or 316 is the step up where the facility wants a harder surface or tighter process requirements. Hot-dip galvanized steel remains the cost-efficient choice for fire reserve duty. The bolted format matters for hospitals specifically: panels are carried in and assembled on site, so an occupied facility with a tight service corridor or a lift-only rooftop is still a viable install.
Storage Is Half the System: Pressure and Redundancy
A correctly sized tank still fails the facility if the pressure side cannot deliver to the top floor at the flow the fixtures need, and a hospital cannot accept a single point of failure on water delivery. We supply pressure booster pump systems: vertical multistage centrifugal pumps in the CDL and CDLF series, SS304, from 0.37 kW to 200 kW, driven by VFD duplex control panels using Inovance drives, IP54 rated, with pressure feedback and automatic alternation. Duplex with auto-alternation means two pumps share runtime and either one can carry the load while the other is serviced, so a failed pump is a maintenance ticket rather than an outage. Variable frequency control holds a steady setpoint across the swing between a quiet 03:00 ward load and a peak morning load. We deliver storage and pressure under one contract with a single team, alongside our hospital water infrastructure and booster pump installation service, with the sequence set out in the installation timeline. Typical installation runs 5 to 14 days for 20 KL to 500 KL, depending on capacity and civil readiness.
Frequently Asked Questions
There is no single figure that applies to every facility. Campus-level sizing guidance from PHCP Pros cites 250 to 350 gallons per day per bed, roughly 950 to 1,325 liters, because it covers outpatient and support buildings as well as wards. Single-building Philippine facilities commonly design to a lower allowance. Take your governing figure from the current DOH HFSRB Planning and Design Guidelines for your facility class, read with the National Plumbing Code of the Philippines, and have your mechanical designer of record confirm it before you procure a tank.
Multiply beds by your confirmed daily allowance, then by your reserve duration. At an illustrative 500 liters per bed per day, a 100-bed facility uses 50,000 liters per day, so a one-day reserve is a 50 KL tank and a two-day reserve is 100 KL. Fire reserve is calculated separately and added on top or protected within the same tank by a raised domestic takeoff. We design and install modular bolted panel systems from 1,000 liters to 500,000 liters, so any capacity in that band is buildable.
No. Per-bed sizing gives you domestic and potable demand only. Fire reserve is a separate volume set by your fire protection design, sprinkler and standpipe demand, and required duration, and it is reviewed by the Bureau of Fire Protection during permitting. You can carry it as a second dedicated tank or protect it inside a single tank by taking the domestic suction off a higher point so normal use cannot draw down the fire allocation. Bring your fire consultant reserve figure to the sizing conversation so both sides can be specified together.
For potable duty we specify WRAS-certified panels, rated for potable water up to 65C, with NSF-compliant liners, because that is the documentation a DOH licensing inspection or an infection control committee will ask to see. FRP and GRP bolted panels are the common choice and carry a 3-year panel warranty with a 20 to 25 year design life. Stainless steel 304 or 316 suits facilities wanting a harder surface. Hot-dip galvanized steel is the cost-efficient option for fire reserve duty where potable certification is not required.
Yes, and that is the main reason hospitals choose bolted panel systems over one-piece tanks. Panels are carried in individually and assembled in place, so a tight service corridor, a lift-only rooftop, or a standard doorway does not rule out the install. Retrofit work on an occupied facility is usually constrained by available slab footprint and structural loading rather than by access, which often points to a taller configuration with a smaller base. Typical installation runs 5 to 14 days for 20 KL to 500 KL, depending on capacity and civil readiness.
Yes. We supply, install, and commission both the storage side and the pressure side under one contract with a single team, so there is no scope gap between tank and pump. Pumps are vertical multistage centrifugal units, CDL and CDLF series, SS304, from 0.37 kW to 200 kW, controlled by VFD duplex panels with Inovance drives, IP54, pressure feedback, and automatic alternation. Duplex auto-alternation gives hospitals the redundancy they need, so a pump out for service does not take the water supply down. We cover NCR, Luzon, Visayas, and Mindanao.