CRP System

Question 1

What EOSS is associated with CRP?

Answer 1

PHOS

Question 2

What is the purpose of CRP?

Answer 2

Ahead and Astern propulsion without changing shaft rotation

Question 3

What is the ratings of the CRP pumps?

Answer 3

Attached: 190gpm 1000psi 168srpm

Motor driven: 190gpm 1000psi

Question 4

What is the purpose of control oil?

Answer 4

Moves Aux servo piston

400psi

Question 5

What is the purpose of power oil?

Answer 5

Move Hub Servo

500-800psi

Question 6

What is the purpose of the HOPM?

Answer 6

Hydraulic Oil Power Module

Heart of the CRP System

Question 7

What is the purpose of the main relief in the HOPM?

Answer 7

Set at 1000psi
Prevents over pressurization of the system
Excess oil is discharged back to the sump

Question 8

What is the purpose of the Sequencing Valve in the HOPM?

Answer 8

500psi
Maintains a back pressure of 500psig to ensure that there is sufficient control oil pressure to operate the control oil side of the system before power oil is sent to the hub.

Question 9

What is the purpose of AUX reducing in the HOPM?

Answer 9

400 psi

The 500 psig back pressure from the sequencing valve is reduced as the 400 psig nominal control oil pressure

Question 10

What is the purpose of AUX Relief in the HOPM?

Answer 10

500psi

If the control oil pressure exceeds 500 psig, the aux relief valve will open and return excess pressure to the sump

Question 11

What is the purpose of the Unloading Valve in the HOPM?

Answer 11

Senses the electric pump discharge and dumps the attached pump discharge back to the sump whenever the electric pump is running. Both pump discharges pass through each check valve to a common header to the sequencing valve and the main relief valve and power oil piping