193.Safematic steering gear

• I1 and I2 are isolation valves.
• B1 and B2 are bypass valves.
• This system offers 100% redundancy.
• There are 3 options for running the system in normal condition.

1. Pump No 1 running giving oil to ram A and B

• Valve I1 and I2 ------------------------- Shut
• Valve B1 ---------------------------------Shut
• Valve B2 -------------------------------- Open 

      2. Pump No 2 running giving oil to ram C and D

• Valve I1 and I2 ------------------------- Shut
• Valve B1 ---------------------------------Open
• Valve B2 -------------------------------- Shut 

      

       3. Pump No 1 and No 2 running giving oil to ram A,B,C and D

• Valve I1 and I2 ---------------------------------- Shut
• Valve B1 and B2 ---------------------------------Shut

• Valve I1 and I2 ---------------------------------- Open
• Valve B1 and B2 ---------------------------------Shut

• Assume that Pump No 1 is running and there is a leak in point X
• 1st --------- Low level alarm will come
• 2nd -------- No 1 tank Low low level alarm will come and standby pump No 2 starts automatically.
• 3rd -------- No 1 tank lowest level alarm will come and Pump No 1 will stop and the system will get isolated by shutting I1 and I2. B1 opens and B2 shuts. Pump No 2 will continue to run.