What is blind isolation?

What are isolation blinds? Also known as paddle blinds, isolation blinds, are devices which temporarily halt the flow of fluid or gas while sections of process piping undergo maintenance.

What devices are used to isolate piping and vessels?

Pipe Blinds Blinds – also known as blanks or spades – provide positive isolation between sections of a process.

How do you isolate a vessel?

Isolation for vessel entry is usually achieved by the installation of blinds or the removal of valves, spools or expansion joints as close to the equipment as possible. Isolation by double block and bleed is NOT sufficient protection for vessel entry.

How do you use a spectacle blind flange?

Spectacle Blinds are simple safety devices that are installed between two pipe flanges. 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.

What is a paddle blind?

A paddle blind is essentially the solid half of a spectacle blind – and is typically used in tighter spaces or areas with limited access. They are also lighter and will more often be used for piping with larger diameters.

Can butterfly valves be used for isolation?

Butterfly valves offer true isolation and control capabilities in a single product. Designed for accurate flow and pressure control, they are ideal in applications where positive isolation is required.

Can a control valve be used for isolation?

Generally, a control valve has Class IV leakage, and if the process involves toxic and flammable liquid, it is advisable to use a remote operated on-off valve downstream of the control valve to isolate the system totally.

What is positive isolation valve?

Positive Isolation: Isolation of process piping, equipment or vessels from hazardous materials (vapors, liquids, or solids) such that it is impossible for hazardous materials to enter the work area. Single Valve Isolation: Most common valves provide only one sealing surface to isolate upstream pressure and fluids.

What are the types of isolation valve?

Gate, globe, ball, butterfly, play, and diaphragm valves are all types of stop or isolation valves. These all valves used for isolation of fluid in a pipeline.

What are Blind flanges used for?

Blind flanges are used to seal the end of piping systems or pressure vessel openings. They are commonly used for testing the flow of gas or liquid through a pipe or vessel, in addition to allowing for easy access to the pipe in case work must be done inside the line.

What is the difference between blind and slip on pipe flanges?

Blind pipe flanges also allow for easy access to the pipe in case work must be done inside the line. They are oftentimes used for high pressure applications. Slip on Pipe flanges with a hub have published specifications that range from 1/2″ thru 96″.

What are Pipe Flanges used for?

These pipe flanges are used to seal the end of piping systems or pressure vessel openings. They are commonly used for testing the flow of gas or liquid through a pipe or vessel. Blind pipe flanges also allow for easy access to the pipe in case work must be done inside the line. They are oftentimes used for high pressure applications.

What sizes do hydrotest Blind flanges come in?

Hydrotest blind flange can be purchased in sizes up to 96″ are available. Many thickness, rating or alloy can be produced upon request. Includes both MSS SP44 Series “A” and API-605 Series “B” ratings. Class 150#, 300#, 400#, 600#, 900#, 1500# & 2500# available with sizes ranging from ½” – 60”

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