Spectacle Blind Dimensions

A spectacle blindis generally a piece of metal that is cut to fit between two pipe flanges and usually sandwiched between two gaskets.  A spectacle blind is often made from two metal discs that are attached to each other by a small section of steel.  The shape is similar to a pair of glasses or "spectacles" – hence the name spectacle blind.  One end of the blind will have an opening to allow flow through the pipe during operation and the other end is solid to block flow during maintenance.  They are generally installed as a permanent device to separate process piping systems.

SPECTACLE BLIND DIMENSIONS

 
Ref.
346810121416182024
AIn/Po5 1/86 1/2810 1/213151719212328
mm130165203267330381432483533584711
BIn/PoInside diameter of pipe, unless otherwise specified
mm
CIn/Po33 3/44 3/45 7/87 1/88 1/29 3/810 5/811 3/812 1/214 3/4
mm7695121149181216238270289317375
DIn/Po222 1/22 1/23333444
mm5151636376767676102102102
EIn/Po3/43/47/87/8111 1/81 1/81 1/41 1/41 3/8
mm1919222225252929323235
FIn/Po5 3/46 1/27 1/28 3/41011 1/212 1/213 3/414 1/215 3/418
mm146165190222254292317349368400457
GIn/Po3/43/43/411111111
mm1919192525252525252525
HIn/Po3/43/43/43/43/43/43/43/43/43/43/4
mm1919191919191919191919
RIn/Po11111111111
mm2525252525252525252525
TIn/Po3/163/161/43/83/81/21/25/85/83/43/4
mm4.84.86.49.59.512.712.715.915.91919
Notes
  1. Thickness, see T.
  2. Material: Stainless steel 304L-316L. Other alloys available upon request.
  3. Other designs and thicknesses available upon request.
  4. Tolerances: ±1/16”.