The function of Spectacle Blind ASME B16.5 is isolating or connecting piping systems. It is a steel plate with a fixed thickness which consists of two discs. The two discs are connected by a flat steel, one is solid and the other is a hollow ring, which is the same diameter as the flange.

1. Spectacle Blind  2. Flange 3. Gasket 4. Bolt

Spectacle Blind ASME B16.5 is  independent of other facilities or devices in the piping system. Normally, it is located in the open position so that the fluid passes through the pipe. When the Spectacle Blind is in the closed position, the pipe and fluid are off.

The maintenance of the piping system is a reason for the Spectacle Blind rotate to the closed position. Spectacle Blind ASME B16.5 connected to a hole in the web, loosen and dismantle part of the bolts, Spectacle Blind can rotate between the flange, after replacing the gasket, the bolts can be reassembled and fastened.

Spade and Spacer

The spade and spacer are basically similar to the Spectacle Blind asme b16.5 , the difference is that the they are two separate parts.

The spade and spacer suits for piping systems that do not require constant maintenance, or for large-diameter pipelines. Depending on the pipe diameter and pressure rate, the spade may have a weight of hundreds of pounds. In order to reduce the unnecessary piping load, we usually select the separate parts spade and spacer instead of Spectacle Blind.

Spade and Spacer

1. Spade  2. Flange 3. Spacer 4. Bolt

As described above about the spade, the pipe is maintained with the replacement of spade and spacer. Loosen all bolts, temporarily remove some bolts, the spade and spacer can be replaced. After replacing the spacer, the bolts can be reassembled and fixed.

Because the spade is between the flanges, we cannot see whether it is a spade or spacer. Therefore, special markings are usually made on the handle, or there is a separate design. Customers usually provide their own technical datasheet.

The ASME B16.48 covers pressure-temperature rating, material, dimension, tolerance, mark and test from 1/2 “to 24” pipeline blind flange. These fittings and ASME B16.5 flange are partners. Spectacle Blind, Spade and Sapcer are made of steel plates or forgings and are approved for use by ASME B31.3. Usually it has the same physical and chemical properties as the flanges and piping materials.

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