Ship Freshwater & RO Capacity Tool

Crew Demand • Potable Storage • RO Product Capacity • Recovery • Feed & Brine • N-1 Redundancy • TDS Screen • Energy • Voyage Reserve

Ship Freshwater & RO Capacity Tool

Turn people, service loads, potable-water storage and watermaker capacity into a voyage freshwater plan. Simple mode answers daily demand, RO coverage, reserve endurance and bunker-water requirement. Advanced builds the ship from consumer groups, service loads, potable tanks, RO units and voyage legs, then checks N-1 production, feed/brine flow, product-TDS screening, energy and tank inventory across the voyage.

↑

Need N-1 watermakers, tank-by-tank inventory, feed/brine and voyage legs? Click Advanced above.Demand defaults are examples only. MLC requires adequate drinking water, while quantity and quality details are implemented by flag State/company requirements.

DemandPeople + service water

ProductionRO output vs daily use

ReserveTank endurance & makeup

Freshwater Demand & Voyage

People aboard

Freshwater use per personL/person/day, user-entered planning basis.

Other service freshwaterm³/day for galley, laundry, cleaning or technical loads not included above.

Voyage durationdays.

Desired reservedays of current daily demand.

Storage & RO Production

Usable freshwater tank capacitym³.

Starting freshwater inventorym³.

RO rated product capacitym³/day.

Expected RO production factor% of rated output across the voyage.

Planned shore / bunkered waterm³ available during the voyage.

Reserve / Product-Water Basis

Desired reservedays of baseline demand.

User product-TDS acceptance limitmg/L. TDS alone does not prove potability.

Minimum N-1 production coverage% of baseline daily demand.

People / Hotel Demand Register

Use	Group	People	L/person/day	Duty %

Fixed Freshwater Load Register

Use	Load	m³/day	Duty %

Potable / Freshwater Tank Register

Usable fraction lets you keep unpumpable volume or operating restrictions outside the planning inventory.

Use	Available?	Capacity m³	Current fill %	Usable %

RO Watermaker Register

Modeled product TDS = feed TDS × (1 − salt rejection). Actual product-divert logic and potable-water acceptance require the vessel’s salinity/conductivity and water-quality controls.

Use	Available?	Rated product m³/day	Capacity factor %	Recovery %	Salt rejection %	Feed TDS mg/L	SEC kWh/m³

Voyage Leg Register

Legs are simulated in the entered order. Demand factor applies to baseline consumption; RO operating factor represents sea/port restrictions, maintenance or planned run time. Shore uplift is added at the start of that leg, subject to usable tank capacity.

Use	Phase	Days	Demand factor %	RO operation %	Shore uplift m³

Freshwater / Watermaker Checks

Flag / company potable-water quantity basis checkedDaily demand and reserve assumptions match vessel requirements. Potable-water quality program checkedSampling, disinfection, tank hygiene and distribution controls are separate from this capacity screen. RO salinity / conductivity divert testedOff-spec product is prevented from entering potable tanks. Remineralization / stabilization verifiedDesalinated water post-treatment is operating where required. Sea-water intake conditions reviewedContamination, harbour restrictions and overboard-discharge arrangement are considered. Prefilters / membranes / HP pump condition checkedEntered capacity factor reflects current watermaker condition. Tank usable volumes verifiedStarting inventory excludes inaccessible or isolated volume. Shore-water quality / connection controls plannedBunkered potable water is managed under the vessel water-safety procedure.

Water-quality boundary: capacity is not potability. WHO ship-sanitation guidance treats onboard-produced water as part of a complete water-safety system and notes the need for appropriate desalination, stabilization/remineralization and disinfection controls. This tool does not certify microbiological, chemical or health compliance.

Planning basis: MLC Regulation 3.2 requires ships to carry and serve drinking water of appropriate quality and quantity, with detailed potable-water standards implemented by flag States. WHO’s Guide to Ship Sanitation recognizes reverse osmosis and distillation for onboard water production and emphasizes post-treatment, materials, disinfection and water-safety controls. RO production, recovery, rejection and energy demand are equipment-specific, so those values remain user-entered in this tool.

Generated by ShipUniverse.com

By the ShipUniverse Editorial Team — About Us | Contact