The right way to select a pump suitable for hazardous areas will depend on factors like the hazardous area classification, the type of fuel, and the volume needed. What will be right in Zone 2 cannot necessarily work in Zone 1, while even the air-operated pump or manual-operated one needs to have grounding in place. Certification, hoses, and installation all play their role. A company that makes fuel handling and dispensing systems, such as Aocheng, would be a good starting point to look at pumps.
An unrated transfer pump may act as a source of ignition in case it is being operated in proximity to flammable fuel vapors. Arcing or sparking can result from the electric motors, switches, plugs, and brushes present in the pump. The transfer pump itself can overheat, while flammable fuel can get statically charged when passing through hoses and connectors.
The situation becomes even more dangerous in case there is not enough ventilation in the area. As a rule, gasoline poses a higher flammable vapor risk compared to diesel under normal usage circumstances.
Gasoline is more volatile as compared to normal diesel fuel. Most diesel fuels have a flash point that is higher than 55°C (131°F). This keeps them safer in the usual state, but things may change if the diesel fuel is heated up, mixed with some gasoline, or if it comes out in the form of a spray mist.
This means that when it comes to choosing a fuel transfer pump for your site, depending only on the label is not enough. It should also consider the fuel temperature and the possibility of its flammability.
When buying an explosion-proof fuel pump, the fuel label indicates only that it is designed for use in a specific hazardous location, but not that it is applicable everywhere.
The pump has to be designed and certified for use at the particular hazardous location. Where there is electrical equipment, this would involve the motor and the electrical enclosures as well. The equipment has to match the gas group and temperature class.
The complete transfer system is important as well. Hoses, nozzles, connections, switches, tanks, and pipes can contribute to the risk of ignition. A certified pump can still be dangerous when improperly installed or connected to equipment that produces static.
Hazardous area zones determine the frequency with which the atmosphere of explosive gas, vapor, or mist might be present. This determines the equipment that is suitable for use, although the hazardous zone has to be determined.
| Hazardous area | Meaning | General equipment requirement |
| Zone 0 | An explosive atmosphere is present continuously, for long periods, or frequently. | Equipment specifically certified for Zone 0. Routine fuel transfer should generally be avoided unless the operation has been engineered for it. |
| Zone 1 | An explosive atmosphere is likely to occur occasionally during normal operation. | Equipment certified for Zone 1, with the correct gas group and temperature class. |
| Zone 2 | An explosive atmosphere is unlikely during normal operation and, if it occurs, is expected to last only briefly. | Equipment certified for Zone 2 or a more demanding classification. Proper installation and grounding are still necessary. |
Fuel tanks and storage or fuel dispensing facilities can be composed of several zones. The space above the fuel inside the tank can have harsher conditions than the space outside the tank. The vents, fill points, hoses, and dispensers can be either Zone 1 or Zone 2, depending on the configuration of the facility.
The use of a pump certified for Zone 2 does not mean that it can be used for Zone 1. The same applies to the gas group and temperature class; general certification for a hazardous area does not mean that all kinds of flammable substances and operating conditions are covered by the certification.
Therefore, an ATEX transfer pump should be chosen based on its actual certification labels and the needs of the site. Certification from ATEX is concerned with the equipment used in explosive atmospheres within the European framework. IECEx is yet another certification that proves conformity with international standards. None of these certifications should substitute for the actual rating of the equipment.
When choosing a Zone 1 transfer pump, one should make sure that the pump and its accessories are certified for Zone 1. In case of uncertainty about the classification of the zone, a competent person should classify the zone in accordance with the applicable local code.
The selection of the drive will depend upon the frequency of transfer, utility available, site classification, and required flow rate. There is no perfect drive that will prevent all possibilities of ignition. Hence, while selecting the drive, all factors related to the entire process need to be considered.
In the case of air-operated double-diaphragm pumps, the electric motor is replaced with compressed air. Thus, it eliminates the possibility of ignition due to electricity, making it a viable alternative in certain hazardous areas.
Yet, not all pneumatic pumps are compatible with flammable fuels. The pump must be designed for the zone in which it will operate, and the problem of static electricity must be addressed. Grounding must be done in spite of the presence of compressed air.
The pneumatic type of drive may be a feasible option if a facility has compressed air and frequent fuel transfers.
An explosion-proof electric pump can be used in a fixed installation where there is electricity available and the hazardous area classification is known. The motor and the electrical housing of an explosion-proof electric pump are designed such that the surrounding atmosphere cannot be ignited by the pump.
“Explosion-proof” should not be used as a general rating. The certificate must correspond with the zone, gas group, and temperature class. It does not mean that an ordinary electric diesel pump would be safe to use in a hazardous area just because it is meant for fuel use.
An electric pump may be easier to incorporate in a fixed transfer system, but the installation must be done according to the instructions from the manufacturer.
A manual rotary or lever pump can be used in cases where the transfer is small and does not require any powered equipment. Such pumps do not pose any risk of electrical sparking due to the pump and do not require any compressed air.
Nevertheless, even when using a manual pump, the danger of static discharge or fuel spillage will remain. Conductive equipment, suitable hoses, bonding, and grounding might still be needed. The fuel must be transferred in a controlled manner and not splashed or poured from a height.
In case of occasional use, a manual pump can be less expensive.
Though increased flow rate can reduce transfer time, maximum speed does not necessarily mean that the process will be safe. High flow rates can lead to the creation of static electricity, turbulence, splashing, and vaporization. The pump has to match the job needs rather than being the fastest one.
Compact 12V fuel transfer pump with a 30 L/min flow rate, 100W motor and 3,000 rpm motor speed. Designed for transferring gasoline, diesel, HVO, XTL and kerosene in compatible fuel systems.
Explore Product & SolutionsThe quantity of the fuel to be transferred during one operation, the distance and height that the fuel will travel, and the volume of the tank or container where it will land have to be considered. The pump, the hose, and the nozzle all have to work within their parameters.
When dealing with flammable liquids, a steady flow through the proper conductive hoses and fittings is recommended rather than trying to work fast. When possible, the delivery pipe or nozzle has to come down near the bottom of the container to avoid splashing.
It is more prudent to buy a certified explosion-proof transfer pump with the required flow rate than an uncertified high-flow one for saving time.
There are several things you can do to increase risk when transferring fuel:
The right flow rate would help achieve the objective without causing turbulence, spillage, or static.
Proper installation is necessary since static electricity is capable of causing ignition even with a proper motor. The certification of the pump does not make a transfer system installation safe, and an improper one dangerous.
Bonding will ensure that the electrical potential difference between the parts is minimized. The grounding ensures a connection with earth. When fuel is being transferred, the pump, conductive hoses and couplings, pipes, barrels, tanks, and receiver vessel should be bonded and grounded according to the equipment instructions.
The grounding circuit has to be verified to ensure that there is continuity through it with a suitable means. If there is any specified resistance value in terms of a manufacturer or code requirements, such values have to be checked rather than simply observed.
Sometimes nonconductive hoses or plastic containers cause difficulties in the management of static electricity. Conductive or specially approved equipment should be used according to transfer procedures. It is a mistake to assume that simply touching the pump to a metal vessel is sufficient.
However, the pump constitutes merely one component of the system. Other components such as hoses, nozzles, fittings, switches, etc., must be adequate for use with the fuel being dispensed and in the classification of the area. Some accessories intended to be used around potentially flammable vapors may require certification as well.
Additionally, the installation should ensure sufficient ventilation and spill containment. Ignition sources should be kept away from the fuel transfer area. It is important to adhere to the manufacturer’s recommendations regarding installation and operating procedures. Local laws related to electricity and fire safety will take precedence to the extent of specific requirements.
Before commencing operations, check that the pump is properly certified for the area, all connections are tight, grounding has been properly accomplished, and the fuel path is suitable.
Not in every situation, but one may be required if the pump operates in a classified hazardous area. Diesel’s relatively high flash point reduces vapor risk under normal conditions, yet hot or contaminated diesel, fuel mist, and enclosed spaces can create additional hazards.
The area’s classification and the pump’s certification determine whether a standard diesel pump is acceptable. A properly grounded pump may be suitable in some lower-risk settings, but the site assessment must guide the decision.
Yes, if the pump is certified for the specific hazardous area and installed correctly. An air-operated diaphragm pump removes the electric motor as a potential ignition source at the pump, but static electricity remains a concern.
An ATEX transfer pump using compressed air must still meet the required certification, grounding, and installation conditions. The hoses, piping, valves, and containers also need to be addressed as part of the complete transfer system.
For small, occasional transfers, a manual rotary or lever pump may be a lower-cost option when it is suitable for the fuel and the location. Conductive equipment, appropriate bonding and grounding, and a well-ventilated transfer area remain important.
An ordinary low-cost electric pump or an improvised plastic setup should not be used in a hazardous area simply to reduce costs. A fuel transfer pump explosion-proof solution must meet the site’s safety requirements, even when the transfer volume is small.
There is no single zone for every fuel storage area. A site may include Zone 0, Zone 1, and Zone 2 locations, depending on the tank design, vapor release points, fuel properties, ventilation, and operating conditions. The vapor space inside a tank may have a more demanding classification than the surrounding area. Vents, fill points, and dispensing equipment may fall into Zone 1 or Zone 2. A competent person should classify the site before a Zone 1 transfer pump or other hazardous-area equipment is selected.
Oct 30,2026
