| Tank Capacity | Working volume versus nominal volume | Select a nominal capacity that leaves approximately 10% free space for thermal expansion and operating margin. | Do not use the full nominal volume as the routine filling limit. Confirm the tank manufacturer's marked fill level. | Verify usable volume, fill-limit markings, access clearance, and compatibility with the receiving container. |
| Tank Material | Construction material and corrosion resistance | Carbon steel is common for diesel and fuel-oil service; stainless steel or compatible plastics may be suitable for corrosive or chemical liquids. | Material selection must match the liquid, concentration, temperature, and exposure conditions. Check chemical compatibility before purchase. | Inspect welds, coatings, fittings, gaskets, and drain points for damage or incompatibility. |
| Tank Design | Structural strength and mounting | Use a tank designed for the intended stationary, mobile, or vehicle-mounted application; do not repurpose an unapproved container. | Vehicle-mounted tanks require secure anchoring and must account for liquid sloshing, impact loads, axle loading, and applicable transport rules. | Confirm support points, load rating, center of gravity, restraint hardware, and protection from impact. |
| Secondary Containment | Spill control and leak collection | Provide a containment system sized according to local requirements; a commonly used planning value is at least 110% of the largest container, with site-specific allowances where required. | U.S. facilities may need to evaluate federal, state, and local spill-prevention requirements, including applicable SPCC provisions. | Confirm the bund or spill pallet is liquid-tight, accessible for inspection, and protected from stormwater accumulation. |
| Ventilation | Normal and emergency venting | The tank should have correctly sized vents and a fill arrangement that prevents excessive pressure or vacuum during filling and withdrawal. | Never block, undersize, or substitute a tank vent. Flammable-liquid service may require flame-arresting or pressure-relief features. | Keep vent openings unobstructed and route them away from ignition sources, doors, air intakes, and occupied areas. |
| Liquid Compatibility | Fuel, oil, water, chemical, or solvent service | Use a tank and pump whose wetted materials are rated for the specific liquid and temperature range. | Compatibility includes the tank shell, hose, seals, gaskets, valves, filters, meter components, and electrical equipment. | Document the liquid's safety data, viscosity, flash point, corrosivity, and temperature before selecting components. |
| Pump Flow Rate | Required transfer rate | Choose the pump from the actual system curve; typical portable transfer applications may range from approximately 10 to 60 L/min, while larger systems can require more. | A higher advertised flow rate may fall substantially when hose length, elevation, filters, meters, and nozzle restrictions add resistance. | Calculate total dynamic head and verify the pump's flow at the required pressure, not only its maximum free-flow rating. |
| Pump Pressure | Maximum discharge pressure | The pump's maximum pressure must remain below the pressure rating of the tank, hose, pipe, filter, meter, and nozzle assembly. | Install pressure relief or bypass protection where a positive-displacement pump can deadhead against a closed valve. | Confirm pressure ratings, relief settings, valve positions, and the consequences of a blocked discharge line. |
| Pump Type | Diaphragm, gear, vane, centrifugal, or peristaltic design | Use a self-priming design when suction lift is unavoidable; use a centrifugal pump where clean, low-viscosity liquid and continuous flow are suitable. | Positive-displacement pumps generally require overpressure protection. Dry-running limits vary by pump design. | Check priming method, dry-run tolerance, viscosity range, maximum suction lift, and maintenance access. |
| Electrical Safety | Motor, controls, and hazardous-area classification | Use equipment rated for the site's voltage, frequency, enclosure conditions, and classified hazardous location, where applicable. | For flammable liquids, equipment selection should follow the applicable area classification and recognized electrical codes; ordinary motors are not automatically suitable. | Provide correct overcurrent protection, grounding, disconnecting means, cable routing, and an emergency stop when required. |
| Bonding and Grounding | Static-electricity control | Bond and ground conductive tanks, pumps, piping, and receiving containers before transferring flammable or static-generating liquids. | Static-control practices should follow the applicable fire and electrical standards, facility procedures, and liquid-specific risk assessment. | Use verified bonding conductors, suitable clamps, clean contact points, and a documented inspection or continuity-check procedure. |
| Hose and Piping | Pressure, chemical, and temperature rating | Select hoses with a working-pressure rating above the maximum system pressure and with a compatible liner, cover, and end connection. | Do not use damaged, kinked, swollen, cracked, or unidentified hoses. Conductive or static-dissipative hose may be required for certain liquids. | Keep hose runs short and supported, protect them from abrasion, and install compatible shutoff valves and breakaway protection where appropriate. |
| Filtration | Contaminant control and pressure drop | Choose filter media and micron rating based on the liquid and downstream equipment; monitor differential pressure rather than selecting solely by a low micron number. | A blocked filter can cause pump starvation, overheating, seal damage, or excessive pressure. Use a bypass only when safe for the liquid and system. | Install the filter in the correct flow direction and provide access for element replacement without uncontrolled spillage. |
| Overfill Protection | Level indication and automatic shutoff | Use a clearly readable level gauge and, where unattended filling is possible, an independent high-level alarm or automatic shutoff. | Overfill protection should be independent of the normal transfer control when the risk assessment requires it. | Test alarms, floats, emergency shutoffs, and interlocks before commissioning and at the required maintenance interval. |
| Leak Detection | Inspection and early-warning capability | Use visual inspection, containment monitoring, or a compatible leak-detection system appropriate to the tank location and liquid. | Leak detection does not replace secondary containment, routine inspection, or corrective maintenance. | Ensure sensors are accessible, protected from false alarms, and connected to a clearly understood response procedure. |
| Metering and Accuracy | Delivered-volume measurement | Select a meter with an accuracy specification suitable for the application and verify it at the actual operating flow range. | Meter accuracy can be affected by viscosity, air entrainment, pulsation, temperature, and inadequate upstream filtration. | Provide calibration access, a resettable totalizer where needed, and a method for preventing air from entering the suction line. |
| Installation Location | Clearance, drainage, and environmental exposure | Install on a stable, level, noncombustible surface where practical, with sufficient space for operation, inspection, and maintenance. | Keep tanks and pumps away from ignition sources, vehicle impact paths, incompatible materials, and areas where a spill could reach drains or waterways. | Provide bollards or impact protection, adequate lighting, weather protection, and controlled access where necessary. |
| Fire Protection | Ignition control and extinguishing equipment | Provide suitable fire-extinguishing equipment and maintain required separation distances for the liquid and installation type. | Flammable-liquid installations may be subject to requirements such as NFPA 30, OSHA rules, fire-code provisions, and local permits. | Post no-smoking and ignition-control signs, maintain clear access, and inspect extinguishers and emergency equipment. |
| Standards and Certification | Design approval and documentation | Prefer equipment supported by applicable test reports, listings, or construction standards for the intended service and location. | Examples may include applicable tank-construction standards, electrical classifications, pressure ratings, and local environmental or fire-code approvals. | Obtain drawings, manuals, certificates, material information, inspection records, and installation instructions before commissioning. |
| Maintenance | Inspection frequency and serviceability | Establish documented inspections for leaks, corrosion, hoses, grounding, filters, vents, valves, pump seals, and emergency devices. | Inspection intervals should reflect liquid hazards, operating hours, exposure, regulatory requirements, and the manufacturer's instructions. | Maintain a service log and remove damaged or out-of-date components from service immediately. |
| Emergency Response | Shutoff, spill kit, and incident procedure | Provide a clearly labeled emergency stop or isolation method and a spill-response kit suitable for the liquid. | Personnel should know how to stop the transfer, isolate energy, protect drains, notify responsible parties, and report releases when required. | Post emergency contacts and procedures near the equipment and conduct periodic drills or toolbox training. |
