Spectacle Blind Plate Specification 2

[calder]

I am looking for a standard or short specification for the construction of a spectacle blind plate for use in a steam blowdown line (vented to atmosphere). It may have other names but what I mean by a spectacle lind plate is basically a blind flange and an attached spacer (it looks like a pair of spectacles) that can be used to allow isolation of a line (requiring a short shutdown)without introducing a valve into the system.

I would appreciate hearing from anyone who knows of an applicable standard, has a short specification, or simply has some experience with the use of a spectacle blind plate.

Thanks,

Calder

 

[butelja]

The thickness of spectacle or slip blind plates is covered by ASME B31.1 (If power steam piping) or ASME B31.3 (if refinery or chemical plant piping).

 

[kstaylor]

Check out API standard 590, Steel line blanks, from the American Petroleum Institute (

http://www.api.org).

API standards are applicable to many industries beyond the petroleum industry.

 

[br549]

You Might want to look at Cam-Set, This is the higher end of the spectical bline market but has some really nice features if it will be used a lot.
MFG Fetterolf Corporation

 

you may fabricate the figure 8 using the thickness defined in b31.3. it is found under para 304.5.3 equation 15. note that that the material should comply with the listed components.

 

[flangetrade]

Standard for Spectacle plates is API 590
Drawings etc for ANSI flanges are on

http://www.flangetrade.com

Also Spectacle plates for flanges not specified in API are shown on this site.

 

[Freddy73]

Check out ASME B16.48, that standar covers pressure-temperature ratings, materials, dimensions, tolerances,marking and testing for operating line blanks(paddle blank like spectacle blind plate)