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Adeel Ahmad
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Join Date: Nov 2009
Location: Kingdom of Saudi Arabia
Posts: 49

Spectacle Blind (Use to Isolate the Line)

09/08/2018 7:21 AM

Is spectacle blind required coating in case of pipeline/ line-pipe is lined?

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lyn
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Join Date: Oct 2008
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#1

Re: Spectacle Blind (Use to Isolate the Line)

09/08/2018 10:45 AM

Read the specification.

Spectacle Blind - Piping Designer
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SolarEagle
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#2

Re: Spectacle Blind (Use to Isolate the Line)

09/08/2018 11:14 AM

It's advisable to use "best practices" for the materials being used, fluids being pumped, and environmental effects of location...check these links below for further info...

https://www.eng-tips.com/viewthread.cfm?qid=248014

https://plantdesignoperations.wordpress.com/2014/08/05/blinds-in-process-piping/

http://www.piping-designer.com/index.php/disciplines/mechanical/stationary-equipment/pipe-flanges/92-spectacle-blind

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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#3

Re: Spectacle Blind (Use to Isolate the Line)

09/11/2018 9:52 AM

Find out here.

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Whitephone
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Join Date: Jan 2010
Location: Mineral wells Tx
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#4

Re: Spectacle Blind (Use to Isolate the Line)

09/12/2018 9:46 AM

One of the important functions of the spectacle blind or figure eight is to indicate whether the passage of fluid through the pipe is open or closed. The coating must cover the flanges but not the external extension of the spectacle blind. This is relevant in case of fires with smoke in the environment since it allows viewing from a distance if the flow is open or closed
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Anonymous Poster #1
#5
In reply to #4

Re: Spectacle Blind (Use to Isolate the Line)

09/12/2018 10:38 AM

Mean that the part of spectacle blind (closed) comes in contact with corrosive fluid is required coating.

Whitephone:The coating must cover the flanges but not the external extension of the spectacle blind.
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Adeel Ahmad
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Join Date: Nov 2009
Location: Kingdom of Saudi Arabia
Posts: 49
#6
In reply to #5

Re: Spectacle Blind (Use to Isolate the Line)

09/12/2018 10:43 AM

Thanks a lot

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Whitephone
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#7
In reply to #6

Re: Spectacle Blind (Use to Isolate the Line)

09/12/2018 11:04 AM

I never respond to anonymity. The external extension is not in contact with the fluid that extension should not be covered by the coating
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Adeel Ahmad
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Location: Kingdom of Saudi Arabia
Posts: 49
#8
In reply to #7

Re: Spectacle Blind (Use to Isolate the Line)

09/12/2018 11:16 AM

Yes you're right, we are not going to apply coating over external extension but only at section of Spectacle blind (closed at one side, as shown in Fig.) which comes in contact with corrosive media.

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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

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#9
In reply to #7

Re: Spectacle Blind (Use to Isolate the Line)

09/13/2018 10:14 PM

How would that hurt anything? (Other than a few cents of budget.)

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Users who posted comments:

Adeel Ahmad (2); Anonymous Poster (1); lyn (1); PWSlack (1); SolarEagle (1); Tornado (1); Whitephone (2)

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