[Abhijit N]

I would like to discuss few of the things about these piping components ultimately to know more about these piping items

Positive isolation–CLOSING VALVES DOES NOT MEAN POSITIVE ISOLATION.

-Spectacle Blind & Spade+Spacer both are used for positive isolation so as to ensure complete safety of the workers during maintenance.
-Positive isolation so as to avoid toxic release to atmosphere.
-Positive isolation might be used to divert fluid to elsewhere.
-Positive isolation to quickly stop the fluid flow in case of emergencies.
-Positive isolation for physical separation between systems when desired/required.
-Positive isolation of individual equipment or it can be the whole process unit as a whole.
-Both of the positive isolation methods are safest & most efficient when compared to other positive shut-off methods like Valve, Valve+Blind Flange.
-Ensures safety & avoids down time
-Shape of a spectacle blind resembles with spectacles, one side is having full blind plate and other side is having ring.
-Spade looks like a frying pan with a handle like bar for handling it.
-Spectacle blinds or Spades should have the same rating as of the piping.

Can somebody tell us more about Spade+Spacer arrangement? While running condition spacers are used & when we need isolation we insert the spade in place of spacer. When the line is running where do we keep the spade? Do we need special facility for storing spades used in the running plant?
We do not face this issue when we are dealing with the Spectacle blind as open/Close both the arrangement are in the same piece of component.

– When do we go for Spade & when do we use Spectacle Blind? As per me, line size drives the selection…hmm…..When the line size increases above 12″ we prefer spades over spectacle blinds. Right? Can somebdoy shaed more light on this matter?

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