A fluid pump apparatus (1100, 2100), the apparatus comprising: a suction compensator (1400, 3400) comprising: an ambient fluid compensator (1600, 2600) defining a first internal volume, an ambient fluid bladder (1620, 2620) disposed within the first internal volume, the ambient fluid bladder in fluid communication with ambient fluid, the ambient fluid bladder partitioning the first internal volume into a bladder volume (1630, 2630) and a residual volume (1610, 2610); a spring compensator (1500, 2500) comprising: a second internal volume, a first separator (1520, 2520) partitioning the second internal volume into a first suction fluid chamber (1510, 2510) and a compensation fluid chamber (1530, 2530), a spring (1515, 2515) disposed within the first suction fluid chamber, wherein the compensation fluid chamber (1530, 2530) is in fluid communication with the residual volume (1610, 2610) of the suction compensator; a housing compensator (1300, 2300, 3300) comprising: a third internal volume, a second separator (1320, 2320) partitioning the third internal volume into a second suction fluid chamber (1330, 2330) and a lubrication fluid chamber (1310, 2310), wherein the second suction fluid chamber (1330, 2330) is in fluid communication with the first suction fluid chamber (1510, 2510) of the suction compensator; a pump (1220, 2220) comprising: a housing (1222, 3222) defining a first lubrication fluid compartment, the first lubrication fluid compartment in fluid communication with the lubrication fluid chamber (1310, 2310) of the housing compensator, the first lubrication fluid compartment connectable with a suction circuit and a discharge circuit. a suction compensator (1400, 3400) comprising: an ambient fluid compensator (1600, 2600) defining a first internal volume, an ambient fluid bladder (1620, 2620) disposed within the first internal volume, the ambient fluid bladder in fluid communication with ambient fluid, the ambient fluid bladder partitioning the first internal volume into a bladder volume (1630, 2630) and a residual volume (1610, 2610); a spring compensator (1500, 2500) comprising: a second internal volume, a first separator (1520, 2520) partitioning the second internal volume into a first suction fluid chamber (1510, 2510) and a compensation fluid chamber (1530, 2530), a spring (1515, 2515) disposed within the first suction fluid chamber, wherein the compensation fluid chamber (1530, 2530) is in fluid communication with the residual volume (1610, 2610) of the suction compensator; an ambient fluid compensator (1600, 2600) defining a first internal volume, an ambient fluid bladder (1620, 2620) disposed within the first internal volume, the ambient fluid bladder in fluid communication with ambient fluid, the ambient fluid bladder partitioning the first internal volume into a bladder volume (1630, 2630) and a residual volume (1610, 2610); an ambient fluid bladder (1620, 2620) disposed within the first internal volume, the ambient fluid bladder in fluid communication with ambient fluid, the ambient fluid bladder partitioning the first internal volume into a bladder volume (1630, 2630) and a residual volume (1610, 2610); a spring compensator (1500, 2500) comprising: a second internal volume, a first separator (1520, 2520) partitioning the second internal volume into a first suction fluid chamber (1510, 2510) and a compensation fluid chamber (1530, 2530), a spring (1515, 2515) disposed within the first suction fluid chamber, wherein the compensation fluid chamber (1530, 2530) is in fluid communication with the residual volume (1610, 2610) of the suction compensator; a second internal volume, a first separator (1520, 2520) partitioning the second internal volume into a first suction fluid chamber (1510, 2510) and a compensation fluid chamber (1530, 2530), a spring (1515, 2515) disposed within the first suction fluid chamber, wherein the compensation fluid chamber (1530, 2530) is in fluid communication with the residual volume (1610, 2610) of the suction compensator; a housing compensator (1300, 2300, 3300) comprising: a third internal volume, a second separator (1320, 2320) partitioning the third internal volume into a second suction fluid chamber (1330, 2330) and a lubrication fluid chamber (1310, 2310), wherein the second suction fluid chamber (1330, 2330) is in fluid communication with the first suction fluid chamber (1510, 2510) of the suction compensator; a third internal volume, a second separator (1320, 2320) partitioning the third internal volume into a second suction fluid chamber (1330, 2330) and a lubrication fluid chamber (1310, 2310), wherein the second suction fluid chamber (1330, 2330) is in fluid communication with the first suction fluid chamber (1510, 2510) of the suction compensator; a pump (1220, 2220) comprising: a housing (1222, 3222) defining a first lubrication fluid compartment, the first lubrication fluid compartment in fluid communication with the lubrication fluid chamber (1310, 2310) of the housing compensator, the first lubrication fluid compartment connectable with a suction circuit and a discharge circuit. a housing (1222, 3222) defining a first lubrication fluid compartment, the first lubrication fluid compartment in fluid communication with the lubrication fluid chamber (1310, 2310) of the housing compensator, the first lubrication fluid compartment connectable with a suction circuit and a discharge circuit.