Spectacle blind

It is different than a valve in that the blind is a permanent or long term isolation device. These are three different components that used in piping for positive isolation of the section of a line or equipment during maintenance and shutdown.

Flange spades and ring spacers, as separate products, are used when the rotation of a spectacle blind would be difficult due to space constraints. A spectacle blind combines, in one single product, a flange spade and a ring spacer.

We typically machine our spectacle blinds using a single piece of metal, but for larger size blinds we often craft these from two metal discs that are attached to each other by a small section of steel. In most cases, spectacle blinds are installed for long-term use.

Their simple operation and durable design ensure a long service life with minimal maintenance. Instead of bolting the blind in place around the full circumference of the pipe like you would a. Ring spacers The spectacle blind flange is also called the figure-blind flange. Paddle Spacer Type 2. Click any image above to enlarge it and lock it in place, then scroll to the bottom table for. Spectacle Blind Installation.

One end of the spectacle flange is soli while the other end has a hole in the center. When the spectacle blinds need to be rotated frequently, considering also high costs of plant shutdown, our solution enable to support operators and maintenance technicians permitting a quick and safety changing procedure in opening and.

The blind is installed in between flanges tosecurely shutdown pipeline during leakage. 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.

If a piece of equipment needs to be inspected or removed from service then the plate covers the ring to form an airtight seal which consequently isolates a section of line or the piece of equipment. A3 A6F4 F4 F5 F6 F6 F706. It consists of a pair of metal discs attached to each other as shown in the figure.

During normal operation, the open end is installed as a spacer to allow uninterrupted flow. To stop the flow in the pipeline, the blind end is rotated into place between the flanges. This positively isolates the downstream piping and equipment. One is solid disc and the other is hollowed.

The hollowed disc allows fluid flow and solid disc is used for positive isolation. You can simply rotate a spectacle blind by 1degrees to close or open a pipe to allow fluid to.

Thickness of spectacle blind is specified based on the pressure and pipe size. Mixed Material Joints ASME B16. These devices are cost-effective alternatives to isolation valves. What are spectacle blind flanges?

The shape is similar to a pair of glasses or.

A single provides closure, while a spacer ring keeps a line open. A vented blind can drain a line or allow access to internal pressure. It fits in the line between two flanges and is bolted in place. One side of the spectacle blind is open (spacer) and the other side of the spectacle blind is blanked ( blind or spade).

Dizionario Inglese-Rumeno spectacle blind. RTJ flanges and requires two pairs of ring joint gaskets unlike the male RTJ spectacle blinds where the gasket is an integral part of the spectacle blind. It is a combination of the two that can be rotated to function as Single Bind or a Ring Spacer.

This kind of flange is generally a piece of metal than 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. A ring spacer is bored to match the pipe I. Technical specification of spectacle blind flange) Haihao Group manufacture steel pipes,pipe fittings and flange products according to standard ANSI,ASME,API,BS,DIN,EN,JIS,GOST etc,we also can manufacture the products as per client’s requirements.

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