COVERAGE

MUD TANK AND MUD PIT CLEANING SYSTEMS
MAREX MARINE SERVICES LTD, BON ACCORD HOUSE, GREYHOPE RD, ABERDEEN AB11 9RD TEL 00 44 1224 894498

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PERFORMANCE DETAILS

The criteria used when determining how many machines are to be placed in each tank are the tank construction and the tank dimensions. When considering tank dimensions it is most unlikely that tanks on rigs or vessels engaged in oil related activity will justify the installation of more than one machine per tank on the basis of size alone. The table of jet length against pressure for 8mm nozzle size is as follows:

Pressure (kg/ cm2)	Flow (m3/ hr)	Jet Length (m)	Cycle Time (min)

4	10.2	11.5	28
6	12.6	12.9	20
8	15.0	14.3	15
10	16.2	15.2	12
12	18.0	15.9	10

Nozzle size, gearing and top connections may be varied to suit individual requirements.

It can be seen that at operating pressures of 8 bar or more the jet length exceeds 15 metres. It should be emphasised that this jet length is pessimistic, in that the actual concentrated effect begins to be lost at that point, although the fluid will carry considerably further.

That being said, the construction of the tank may cause shadow areas. Internal supports or very deep transverse framing are the most typical reasons for more than one machine being required and occasionally internal divisions make more than one machine absolutely essential.

The fact that throughput is doubled with the addition of one machine should ensure that caution is exercised when designing systems.