Figure 4-2.—Water Brakes.
(1)
(2)
(3)
(4)
(5)
(6)
Retraction engine cylinder and piston
Advance stroke buffer
Retract stroke buffer
Main hydraulic accumulator
Sheaves
Cable equalizers (retract and advance)
b. Rotary retraction engine system:
(1)
(2)
advance)
(3)
(4)
Retraction engine hydraulic motor
Cable tensioner assemblies (retract and
Screw and traverse carriage installation
Sheaves
4. Drive system. This system provides the means
of transferring the motion of the retraction engine to the
grab to advance and retract the shuttle and piston
assemblies.
a. Linear retraction system:
(1) Grab
(2) Advance and retraction cables
(3) Fairlead sheaves
b. Rotary retraction system:
(1) Grab
(2) Advance and retraction cables
(3) Fairlead sheaves
(4) Drum assembly
5. Hydraulic system.
a. Linear system:
(1) Two main hydraulic pumps
(2) A circulating pump
(3) A drain pump
(4) A gravity tank and external cooler
(5) The associated piping and control
valves
(6) The main hydraulic accumulator
(7) Air flasks (2)
4-3
