A critical facility must run for several hours or longer
Hospitals, data centers, factories and commercial facilities need a direct relationship among target runtime, critical load and fuel reserve.
Power-System Component / Extended Runtime
Fuel Autonomy and Refueling System
A generator that starts has solved only the first minutes of an outage. A dependable fuel system combines consumption, usable tank capacity, supply and return lines, automatic transfer, level alarms and delivery access so standby power can continue safely.
Consumption and Load MatchingTank CombinationsAutomatic Fuel TransferLevel and Leak Monitoring
Why Add a Fuel-Autonomy System
When an outage can outlast the generator's onboard fuel, or a delivery cannot arrive at any time, the complete fuel chain must be planned in advance
The customer value is not simply a larger tank. Fuel volume must be calculable, flow must remain continuous, refueling must be practical, abnormalities must raise alarms, and fire, environmental and inspection boundaries must be clear.
Nighttime, disaster or remote-site fuel delivery is uncertain
Day-tank capacity, bulk storage and replenishment intervals reduce the risk of a second shutdown while a delivery is delayed.
Tank size is estimated only from full-load consumption multiplied by hours
Actual load factor, unusable volume, return flow, minimum level, fuel temperature and contingency reserve change real runtime.
Storage volume is defined without a transfer or safety concept
Tank location, pumps, valves, vents, overflow, spill containment, fire separation and tanker access must be reviewed together.
Complete Path from Storage to Engine
Calculate the operating requirement first, then make storage, transfer, monitoring and replenishment one uninterrupted fuel chain
Failure at any interface can stop a project that still has fuel in storage. Every stage should match the engine's supply-and-return limits, the control sequence and the site's safety conditions.
Estimate consumption from load factor and operating hours
Use the engine's consumption curve, load profile, starting and no-load time while reserving unusable volume and operating margin.
Assign roles to base, day and bulk tanks
The near-engine tank stabilizes supply while external storage provides longer autonomy under the site's space, code and maintenance limits.
Pumps, filters, valves and piping keep fuel moving
Supply and return lines must meet the engine's flow, lift, restriction and cleanliness requirements.
Transfer automatically by level with a manual bypass
Low level starts transfer and high level stops it, while pump failure, overfill, valve position and interlocks generate alarms.
Coordinate venting, overflow, spill control and fire protection
Storage areas, wall penetrations, grounding, static control, bunding and fire separation follow the site rules.
Include tanker access and supply cadence in the operating plan
Define the fill point, vehicle position, operator steps, reorder level, supplier response and severe-weather contingency.
Product and System Configurations
Combine base tanks, day tanks, bulk storage and automatic transfer around target runtime and site conditions
Do not begin with one fixed tank capacity. First define consumption, operating time, available space and expected delivery frequency, then select the tank hierarchy and control method.
Base Tank or Generator-Integrated Tank
For short standby periods, compact spaces and easy delivery access. External piping is reduced, but usable volume and service access still need verification.
Independent Day Tank
Provides stable supply near the generator and can combine with bulk storage, transfer pumps and level controls for easier daily inspection.
External Bulk Tank or Storage Vessel
Provides the main reserve for prolonged outages and is located around safety distances, foundations, corrosion protection, bunding, venting and tanker access.
Automatic Transfer and Multi-Generator Fuel System
Duty/standby pumps, filters, valves, level control and alarms feed one or several generators for extended operation and centralized supervision.
Every capacity should be reviewed against engine-manufacturer consumption data, project load factor and local fire and environmental rules. This page does not promise a fixed consumption rate or fixed runtime.
Fuel Economy and Runtime Matching
To reduce fuel cost, keep the generator in a sensible load range before optimizing tanks and replenishment
Fuel economy cannot be judged from one catalog number. Engine platform, generator sizing, actual load factor, idle time, maintenance condition and fuel quality together determine the cost of delivered electricity.
Short Transfer CoveragePrioritize reliable starting and short operation; verify usable integrated-tank volume and practical refueling.
Overnight or Single-Shift RuntimeHold enough fuel for unattended or delivery-restricted hours and use low-level alarms and shift handover records.
Full-Day or Multi-Day RuntimeCombine a day tank, bulk storage and automatic transfer with inventory, supplier and bypass plans.
Uncertain Outage DurationSet reserve from minimum safe stock, achievable delivery interval and severe scenarios rather than average outage duration.
Engine Consumption CurveReview manufacturer data around 25%, 50%, 75% and 100% load
Actual Load FactorAvoid chronic light loading or excessive generator oversizing
Target Operating TimeSeparate must-run critical loads from loads that can be delayed or shed
Usable Fuel VolumeDeduct unusable reserve, expansion space and minimum operating level
Fuel Quality and FiltrationStorage age, water, contamination and low temperature affect dependable supply
No-Load and Test ManagementRecord unloaded, exercise and loaded hours to avoid waste and wet stacking
Maintenance ConditionAir, fuel-filter and injection-system condition affects consumption and output
Level and Run RecordsUse trends to compare theoretical consumption, detect leaks and plan deliveries
Tank, Piping and Control Details
Runtime reliability depends on verifiable tank construction, level sensing, supply and return lines, and abnormal-condition protection
Customers do not need to design a fuel system, but they should be able to verify tank material, interfaces, level devices, pumps, filtration, spill controls and test records so stored fuel can actually reach the generator.
Tank Body and Welds
Material thickness, internal cleanliness, corrosion protection, welds and supports affect long-term storage and handling safety.
Local Level Gauge and Sensors
A local gauge supports quick checks while electronic sensors provide low, high and overfill alarms.
Fill, Vent and Overflow
Connections should prevent pressure problems, water entry and spills during refueling.
Supply, Return and Drain
Port sizes, location and piping restriction must match the engine and preserve water and sediment removal.
Transfer Pumps and Filters
Flow, head, duty/standby changeover and filtration cover normal transfer and pump-failure conditions.
Isolation, Check Valves and Bypass
Isolation, non-return protection and a manual bypass simplify service and prevent siphoning, backflow and operating errors.
Bunding and Leak Detection
Spill containment, alarms, grounding, static control and fire separation follow the site's rules.
Controls and Operating Records
Level, pump state, alarms, transferred volume and run hours support inspection and fault tracing.
Six Project Inputs
Provide consumption, runtime, space and replenishment conditions so the autonomy concept can be built and operated
Engine model and consumption data
Provide generator rating, engine model, expected load factor and fuel-use data at relevant load points.
Target runtime and critical loads
Define minimum guaranteed hours, load priorities, sheddable equipment and the outage-duration assumption.
Tank location, space and elevation
Share plant-room and outdoor storage locations, foundations, piping distance, level difference, access and environment.
Tanker route and supplier response
Confirm vehicle size, parking position, fill connection, arrival time, delivery cadence and operator responsibility.
Fire, environmental and spill requirements
Define storage limits, separation, bunding, venting, grounding, drainage and local approval boundaries.
Level points, alarms and remote monitoring
Define pump logic, alarm outputs, manual bypass, remote notifications and recording requirements.
Typical Runtime Tasks
Outage windows and delivery constraints differ by facility, so fuel reserve and operating strategy must be defined for each project
Protect life safety, cold chain and core IT loads during an uncertain outage
Set minimum inventory from critical demand, UPS ride-through, cooling needs and tanker response, then verify it against level and run records.
Bridge overnight, holiday and traffic-restricted delivery windows
Hotels, malls and schools balance runtime with noise, odor, fire safety, occupied areas and restrictions on refueling during operation.
Bring production loss, fuel supply and multi-generator operation into one plan
Factories and remote sites plan around process loads, generator rotation, stored-fuel quality, standby pumps and supplier intervals.
Review fuel autonomy around consumption, target runtime and site replenishment conditions
Share generator rating and engine model, load factor, required hours, tank space, delivery route, fire and environmental requirements and monitoring needs. HOHANK engineers will define the tank hierarchy, pumps, valves, piping, alarms and test scope.