Generator Diesel Fuel Day Tank





Day tanks are fuel containment systems designed for installation in close-proximity to an engine to provide a reliable supply of diesel fuel. They are often mandatory when the engine-mounted fuel pump is unable to draw fuel from a remote-mounted fuel tank due to distance or elevation issues. For safety and reliability, these fuel systems are configured as suction-type, meaning that the day tank draws fuel from the main tank, and the engine draws fuel from the day tank.

There are key differences in the configuration of these systems when used with above-ground storage tanks (AST) or under-ground storage tanks (UST). There are also important considerations that relate to tank accessories.

Integration with AST – in this type of application, attention should be given to the elevation of the day tank in relation to the main AST. Because of the possibility for syphoning between the day tank and AST, certain components should be installed in the fuel piping. Typically, a solenoid valve and strainer are installed on the tank’s pump inlet. This is an electrically-operated valve that will be normally closed. It will only open when the tank level is sensed to be low, at which point the solenoid valve is opened and the supply pump is energized. As the tank reaches a full level, the solenoid valve and pump are de-energized, which stops the flow of fuel and closes the fuel inlet to the tank. Additional components that are recommended on these systems are manually-operated ball valves and fusible link valves that automatically close in the event of a fire. These should be installed on the inlet and outlet of the tank to allow isolation of the equipment for emergency or regular scheduled maintenance purposes.

A well-designed system requires that the day tank be capable of returning any excess fuel back to the AST. Failure to stop a fill pump or close a solenoid valve could result in continuous filling of the tank. Without the means to return excess fuel, a spill will be inevitable. The overflow return pump is generally mounted on the tank and should be sized to be able to overcome the supply pump. Its outlet should be equipped with a check valve to prevent backfeeding when the return pump stops.

Some applications will have the AST in a remote location that is too far for the day tank pump to draw fuel reliably. In these cases, the day tank is equipped with an overflow pump, and a stand-alone supply pump is mounted near the main tank to draw fuel from the AST and push it to the day tank. The remote pump would still interface with the tank’s level controller to receive start/stop signals.

Integration with UST – in this type of application, consideration should be given to the possibility that the day tank supply pump might lose its prime. For this reason, a foot valve is generally installed on the main tank, and a hand pump, check valve and solenoid valve are installed on the day tank. The hand pump allows for emergency filling and also provides the means to restore fuel prime on the line that feeds the motor-operated pump. The check valve and solenoid valve act to restrict any backflow to the main UST. In UST applications, overflow (return) fuel is generally piped from the day tank to the UST and gravity is enough to prevent overflowing of the day tank. As in AST designs, should the day tank be too far from the UST, the supply pump should be located by the UST.

General configuration recommendations – following are additional recommendations to consider for a properly configured system:

1. Insist not only in UL142-compliant day tanks but also in UL508-compliant controls.

2. Size the tank to allow for a minimum 2 hours of engine run-time without need to refill.

3. The supply pump should be sized to three-times the full-load fuel consumption of the engine (or engines if the tank feeds multiple engines). In the example above (120GPH or 2GPM consumption), the pump should be sized at minimum of 6GPM.

4. The return pump (if applicable) should be sized to exceed the capacity of the supply pump.

5. Size all accessories (such as ball valves, solenoid valves, etc.) no smaller than the fuel lines that connect to the accessories.

6. Specify double wall construction with rupture basin leak detection sensor. This sensor is interconnected to the supply pump to stop its operation in the event of a leak in the main containment. The controller should also indicate the condition with a visual alarm.

7. Always specify that the appropriate pressure relief vent caps be included with the tank. These allow for emergency venting should the normal atmospheric vent become obstructed. In interior installations, the working vent must be piped to the exterior.

8. Review local authorities having jurisdiction (AHJ) to understand whether controls and accessories should obtain power from engine batteries (i.e.: 24Vdc) or whether a 120Vac emergency accessory circuit would be acceptable.

9. Most diesel engines draw more fuel than is required for combustion. The excess fuel is typically returned to the day tank. Depending on rate of fuel return, you may need to consider routing it to the main tank, or you may need to design your system with a larger day tank or a fuel cooler to avoid heating of the fresh fuel supply. Heated fuel will diminish the engine’s horsepower rating, and may lead to engine shutdown if the building loads exceed the power capability of the engine.

10. On a prime-duty application, increase system reliability by specifying a duplex fuel supply pump set with cast iron pump housings and steel rotors. Duplex pumps allow for lead/lag or simultaneous operation at the operator’s discretion. The heavier duty cast-iron pump will last longer and produce less operating noise.

11. Insist on the following local and remote alarms from your vendor:

a) low level alarm and remote annunciation output contact.

b) high level alarm and remote annunciation output contact.

c) critical high level alarm, pump shutdown and remote annunciation output contact.

d) critical low level alarm, engine shutdown (prevents loss of fuel prime) and remote annunciation output contact.

e) tank leak detection alarm and remote annunciation output contact.

The guidelines above may help in the selection of the appropriate product for your application. However, we recommend that you contact your vendor to review any options or accessories that might be needed to insure reliable and safe operation of a specific fuel system application. For additional resources related to day tanks and related fuel systems, you may visit http://www.hurtado.cc/resources.htm.

Certaines personnes se demandent si le jus de citron vert peut remplacer le jus de citron pour la perte de poids et vice versa. La réponse serait oui. Tous les fruits contenant de l'acide citrique peuvent être substitués les uns aux autres, comme le citron, le pamplemousse, le citron vert, etc. Les jus de citron et de citron vert peuvent fournir des éléments acides et du zeste à vos recettes lors de la cuisson au four. Si vous n'en avez pas, alors vous pouvez le remplacer par l'autre.

Pourquoi utiliser du jus de citron pour perdre du poids

Il y a déjà plusieurs affirmations sur le succès de ce régime. Pour perdre du poids efficacement, vous pouvez presser un citron dans l'eau chaude tous les matins. Certaines personnes se demandent si ces affirmations sont réelles. Eh bien, il semble que ce soit un fait dû aux preuves rassemblées sur l'efficacité des citrons dans la régulation de l'absorption du sucre dans le corps ainsi que dans l'amélioration de votre digestion. En plus de cela, il contient également de la vitamine C, qui est un élément très important pour ceux qui sont sérieux au sujet de leur perte de poids. En effet, le corps absorbe plus de calcium dans les cellules adipeuses, ce qui peut aider à perdre du poids.

Comment fonctionne le jus de citron pour perdre du poids

En fait, il est assez surprenant de constater à quel point le jus de citron peut être très efficace pour l’absorption du sucre ainsi que pour la régulation du métabolisme. Il vous aide donc à perdre du poids supplémentaire. Le secret est caché derrière la teneur en acidité du citron. Le jus de citron est plein d'acide citrique. C’est pourquoi, si vous prenez un verre de jus de citron avec de l’eau chaude en début de matinée, vous pouvez obtenir une digestion naturelle et saine dans votre estomac. L'acide citrique contenu dans le citron interagira avec les enzymes et les autres acides de votre système digestif, ce qui vous permettra d'avoir une digestion saine et sans souci.

Le jus de citron pour la perte de poids peut réduire votre absorption de sucre. Selon des études, cela prend juste un peu de citron et vous pouvez déjà réduire votre absorption de sucre. Cela est dû à la teneur élevée en acide du citron. En plus du jus de citron, vous pouvez également manger les zestes de citron. Les peaux contiennent de la pectine qui peut aider à perdre du poids, car elle formera une substance gel dans l'estomac et facilitera l'absorption du sucre dans les aliments que vous mangez.

Selon les recherches effectuées à l'Arizona State University, les personnes qui consomment des aliments riches en vitamines telles que le citron, le citron vert, les oranges, les kiwis et les raisins ont moins de chances de prendre du poids par rapport à celles qui consomment peu de vitamine C En plus d'avoir un système digestif en bonne santé, il peut également aider à absorber plus de calcium provenant des aliments que vous mangez et le calcium sera stocké dans les cellules adipeuses. Plus vous avez de calcium dans vos cellules adipeuses, plus vous brûlerez de graisse. C'est donc un autre avantage du jus de citron pour la perte de poids.