Fuel filler / tanks
The supply of consumers with fuels in the industrial and private area has enormous importance. The shortage or complete absence of fuels would burden or bring the economy to a standstill. The utility companies have installed large tank farms where they keep inventories along with refineries. From there, the fuel is distributed via tankers/tank lorries.
The energy market is constantly in motion due to increasing or decreasing crude oil prices. Despite the diesel scandal, most transports are carried out by diesel lorries. That is why this fuel will also be used in the future.
Loading diesel from large tanks into tank lorries and then into the storage tanks of petrol stations and final consumers takes place using pumps. For diesel fuels, pumps without ATEX classification can be used in most cases, with such zones coming into being in tank farms, anyway. For other fuels, which are handled in tank farms, ATEX areas are valid that are specified by the customer.
Successful application solutions
Diesel pumps must meet installation conditions and the requirements to explosion prevention level and should excel by good energy efficiency and good NPSH values. The delivery rate and pressures depend on the relevant types of application.
The task of drawing fuel out of an underground tank can be solved by using self-priming pumps, thus achieving a gain in operational safety. The same applies if the pumps stand next to the diesel tank and one have to suck beyond the edge of the tank. One can choose between compact bloc machines or multi-stage pumps for higher pump pressures. Actuation is effected via corresponding three-phase motors, but others are also possible.
Airports operate own tank farms and tank stations for airfield fuelling. Here the fuel Jet A1 is used. Therefore, increased ATEX requirement have to be met.
So far, vane pumps were used here, but which operate very noisily due to their design. A further requirement was to suck the fuel via very long suction lines, partly longer than 60m, with occurring high curves. Deployed were self-priming centrifugal pumps in spherical graphite iron design according to ATEX. That way, in case of suction-side “air sacs”, there is also a safe operation with good efficiency and little noise emission. Due to the multi-stage system, higher pressures instead of the common 2-3 bar can be generated. Expensive built-in pumps could be dispensed with.