NESL - Semi/Permanent Tanksweeps
The success of NES Tanksweeps used on problem tanks where the sludge level was above the manways and required a hot-tap to insert Tanksweep has led to the development of the fixed Tanksweep.
NES Fixed Tanksweeps are for use in new tanks or tanks that have been cleaned and are about to be put back into service. Alternatively, they can be used on tanks where the manway can be removed for cleaning and used to re-suspend accumulated solids enabling the tank to be pumped down with a maximum contents removal effected without man entry.
Fixed Tanksweeps are simple to install by using the existing manways and can be connected to the tank operators own pumps and existing pipework.
The number of tanksweeps required depends on the tank diameter. Typically 2 Tanksweeps are required for tanks up to 50m in diameter, 3 Tanksweeps are required for tanks with diameters between 50m and 80m, and 4 Tanksweeps are required where the tank has a diameter greater than 80m.
Tanksweeps will prevent a build-up of sludge on the tank floor by creating a movement in the oil inside the tank. This movement ensures that any solids are suspended in the mobile oil and do not settle on the tank floor.
Tanksweep nozzles can be rotated 200 degrees either manually from the outside of the tank by means of a hand wheel, or the unit can be hydraulically controlled.