Difference between LO/LC y CSO/CSC

[ygcampos]

Lock system in a block valve can be LO/LC and CSO/CSC, which is the difference between both devices.

 

[dcasto]

I would interpert LO/LC to mean a physical lock that takes a key to operate the valve, it would be an engineered (designed) controled access. CSO/CSC means a tag that can be removed easily under Administrative controls (paperwork/permit/permission).

 

[dtn6770]

dcasto's statement is consistent with my experience. I would add that LO/LC probably applies to isolation activities such as LOTO (lock out tag out) whereas CSO/CSC can be applied to "normal" modes of operations. For example, equipment to be worked on would need to have valves locked; to prevent a valve from being opened or closed during daily operations they could be CSO or CSC (car-seal-open or car-seal-closed).

Facilities I'm familiar establish "car-seal" lists that are routinely check to make sure the valve seals are intact.

 

[JLSeagull]

I too agree. Some plants prefer locks. Other facilities prefer seals.

LO/LC pertains to physical locks. Car seals indicate a reason not to operate, while permitting operation in an emergency.

Some complex operations have required "Kirk Keys" that require lock operations within a sequence.

Some companies use a key cabinet within the operating superintendent control.

Car Seals
Offshore, losing a key could be very problematic.

Some operations simply use tie-wraps with a tag for Who, why, when, etc.

 

[Ashereng]

I agree with all statements above.

CSO/CSC is under specific site adminstration requirements to remove the seal. Whehter there is a physcial lock or not is not evident by the designation alone.

A LO/LC has a lock. Whether there are other adminstrative requirements to remove the lock, this is not evident by the designation alone.

In terms of how common CSO/CSC vs LO/LC is, I typically see CSO/CSC more than LO/LC. I guess one reason is losing a key is a pain.

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