Locke open/cloesed vs car seal open/closed 3

[B.L.Smith]

Dear friends,

What is the difference between locked open/closed valves and car seal open/closed valves? Is there any difference in appearance of these valves?
I tried to find the answer in the net but I couldn't. Could u mind share ur knowledge and photos, if any.

Best Regards,
B.Smith

 

[hsbcn]

The car seal lock is a lock installed to avoid inadvertant or accidental opening/closing of a valve. A locked valve, however, is one that is not only locked but should only be opened/closed after certain security measures have been taken and/or approvals obtained.

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[pennpiper]

The "Lock open/closed Valve or car seal open/closed Valve" is not a type of valve. It is a "Condition" of a valve. Any valve can have a lock or a Car-Seal added to it. These devices would be considered "after-marker add-on".
Any standard valve (Gate, Globe, Ball, Plug, Needle, Diaphram, Orbit, Butterfly, etc) can have a locking device or Car-Seal added to it. Conversely any valve that had these devices on them, can have them removed and then they are just valves.

prognosis: Lead or Lag

 

[LittleInch]

Pennpiper has it nailed. The "car seal" is normally just a small seal, often plastic now, but sometimes still metal - see websites below for typicals. This is often installed by Quality inspectors when sealing off tanks or ops guys arranging valves in a particular mode for a specific operation. Removing these seals normally requires very little force or simple cutters.

http://www.americanseals.com/meter-seals/spin-wire-seals-twist-model-name-spinseal

http://www.seton.com/wire-with-crimping-seal-js255.html

Locked open / closed means exactly that, i.e. you need a key to open a padlock which is kept secure and only released against work permits etc. Tends to be for safety critical valves - isolation valves for Pressure relief valves for example - to keep them open or closed and stop someone changing the position without authorisation.

The valve looks the same - some hole or other mechanism which prevents opening without breaking the seal / removing the lock. Often seen on valve data sheets as a Y/N option.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[MortenA]

As far as i know the term "car seal" comes from box-cars on trains. The seals were to proof that the doors of the car had not been opened during the travel.