Treatment of the internal surfaces of petrol tanks for re-suspending accumulated sludge into the crude oil within the tank utilizing pumping out the crude, covering the sludge and re-injecting it under appropriate pressure

'accumul':13 'appropri':36 'cover':27 'crude':17,26 'inject':33 'intern':4 'oil':18 'petrol':7 'pressur':37 'pump':23 're':11,32 're-inject':31 're-suspend':10 'sludg':14,29 'surfac':5 'suspend':12 'tank':8,21 'treatment':1 'util':22 'within':19

Cleaning of petroleum storage tanks by means of reclaiming hydrocarbons present in tank sludge

'clean':1 'hydrocarbon':10 'mean':7 'petroleum':3 'present':11 'reclaim':9 'sludg':14 'storag':4 'tank':5,13

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