ASME B16.48 Hastelloy C-276 Spectacle Blind Nickel Alloy Flanges Material Size 2'-24' 1200#

1. What is Spectacle Blind or figure 8 blind?

Spectacle blind is pressure retaining plate with one solid end and one open end connected with small nose piece (small tie bar). Now, look at the image of this blind. As it resembles a pair of eyeglasses or numeric number Eight, Spectacle blind is also known as a figure 8 blind and sometimes refer collectively as figure 8 spectacle blind.

2. Paddle blank or Spade or Slip Blind

Paddle blank or spade is similar to the solid end of the spectacle blind. A handle is welded with the spec blind. See the image.

3. Paddle Spacer or Spacer Ring

Paddle blank or spacer ring is similar to the open end of the spectacle blind. A handle is welded with the blank. See the image.

4. Use of Spectacle Blind, Spades and Spacers

Spectacle Blind, Spades and Spacers are used to provide flexibility during maintenance an operation. Therefore, it is essential to consider this during design of Piping system. Blanks are installed in horizontal line. In general, you can see the use of spectacle blind flange at following location;

. At inlets and outlets of static equipment

. At inlets and outlets of rotary equipment

. At inlets and outlets of fired heater and common headers

. In bypass line

. At unit battery limit

5. Spectacle Blind Flange Class & Types

ASME B16.48 standard that covers Line Blanks. This standard covers the Spectacle Blind, Spades and Spacers with pressure class 150, 300, 600, 900, 1500, and 2500 as listed in ASME B16.5.

6. Spec blinds are available in the following face type;

. Raised Face

. Female Ring-Joint Blanks

. Male Ring-Joint Blanks

7. More Information about C276

Hastelloy Alloy C276 Pipe Flanges Chemical Composition

Hastelloy C276 Plate Flanges Mechanical Properties

Equivalent Grades for C276 Hastelloy Industrial Pipe Flanges

8. Hastelloy Flange Standards / Types And Pressure Class :

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