Hydraulic tanker

Ship stability is improved by eliminating free surface in partially filled tanks.

[2] Ship structural stresses are reduced by eliminating dynamic loading caused by sloshing of fluids in partially filled tanks.

[3] The hydraulic system is ineffective with heavy or viscous oils and not recommended for greater than 15-degree Baumé.

Low solubility is typically of negligible concern with respect to product loss, but discharge water can contribute to oil pollution.

Pollution levels may be insignificant where navigable waters contain elevated background levels of petroleum products; and the advantages make hydraulic tankers useful oil spill recovery ships when their storage tanks may act as oil–water separators.