Day tanks: Tanks at or near the generator set from which the generator set draws its fuel are called day tanks (although they do not necessarily contain sufficient fuel for a day’s operation). These are used as a convenience or when it is not practical to draw directly from the primary fuel storage system. The distance to, the height above or below, or the size of the primary tank are reasons for using a day tank. All diesel engines have limitations as to fuel lift capability (or fuel draw restriction), fuel head pressure (both supply and return) and fuel supply temperature. The fuel is transferred from the primary tank to the day tank using a transfer pump often controlled by an automatic system utilizing level sensors in the day tank. If the tank is small, the fuel return is pumped back into the primary fuel tank to avoid overheating of the fuel.
Sub–base tanks: Usually larger than day tanks, these tanks are either built into the base frame of the generator set or constructed so that the generator set chassis can be mounted directly onto it. These tanks hold an amount of fuel for a specified number of hours of operation such as 12 or 24 hour sub–base tank. Sub–base tanks are often dual–wall, incorporating a secondary tank around the fuel container for the purpose of fuel containment in case of a primary tank leak. Many local regulations require secondary fuel containment such as dual–wall construction along with full monitoring of primary and secondary containers.
No comments:
Post a Comment