This video explain Purpose of spectacle blind and How to identify Spacer and spade in field and drawing?
Clearly explained with Pictures and P&id symbols.

Use of Spades and Spacers Blinds:
Spectacle Blind, Spades, and Spacers are used to provide flexibility during maintenance and operation. Therefore, it is essential to consider this during the design of a Piping system.

In general, you can see the use of these flanges at the following location;

1.Inlets and outlets of static equipment
2.At inlets and outlets of rotary equipment
3.Inlets and outlets of the fired heater and common headers
4.In bypass line
5.Unit battery limit

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