What is spectacle blind?
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. This positively isolates the downstream piping and equipment. A Spectacle Blind is generally installed as a permanent fixture.
Why is spectacle blind used?
What is the purpose of spectacle blind? A spectacle blind is a safety device used to isolate a section of line or piece of equipment when the line or equipment needs to be inspected or removed from service. It is different than a valve in that the blind is a permanent or long term isolation device.
What is a pipeline blind?
A blind flange is a solid disk used to block off a pipeline or to create a stop. Instead, it is placed in between two open flanges, which stops the flow through a pipe. Many times this type of blockade is used when adding another line onto an existing pipeline or when a new valve is being added.
How do you flip a spec blind?
Adjusting spectacle blinds is straightforward. Simply loosen the bolts around the flange leaving the bolt running through the spectacle blind in place, rotate the desired face into the space between the pipes, and tighten the flange bolts again, some piping applications will require new gaskets to be installed.
What is a paddle blind?
A Paddle Blind is basically the solid half of a Spectacle Blind. A Paddle Blind is often made from one solid metal disc and will usually have a thin length of metal attached to one end to be used as a handle. A finished assembly will resemble the shape of a paddle, hence the name.
Where do you put spectacle blinds?
A spectacle blindconsists of a blind and spacer. The blind is installed in between flanges tosecurely shutdown pipeline during leakage or maintenance.
What B16 48?
The ASME B16. 48 standard that determines the dimensions of a spectacle blinds is ASME B16. The ASME B16. 48 Spectacle Blind Flange is available across different markets in sizes NPS 1/2 through NPS 24, whereas the pressure class rating of ASME B16. 48 is as follows i.e. 150, 300, 600, 900, 1500, and 2500.
Why is it called a blind flange?
The name comes from the fact that the assembly looks like eyeglasses, or “spectacles”. These are normally used in piping systems, usually between two standard flanges, and are designed to block off a section of pipe.
Where is blind flange used?
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 bleed ring?
A bleed ring is a ring section with one or more radial pipe connections designed to fit between standard flanges within the bolt circle, using conventional gasket material. The ring normally comes with a 1/2 inch socket weld or 3/4 inch tapped for connecting with valves and instruments.
What is spacer ring?
The spacer is an all-metal band that is meant to sit between your engagement ring and your wedding band, or within a stack of multiple bands. It is intended to protect your diamond bands rings from wearing on one another.
How big are the spectacle blinds in Sweco?
Piping Technology and Products, Inc. and SWECO Fab, Inc. designed and fabricated 24″ 300 # (ANSI rating), 2 1/2″ thick and 42″ 600 # (ANSI rating), 3 7/8″ thick carbon steel spectacle blinds. Spectacle blinds serve the same purpose as flow control valves at less the cost.
How big are 24 ” and 42 ” spectacle blinds?
24″ and 42″ Diameter Spectacle Blinds 24″ and 42″ Diameter Spectacle Blinds 24″ and 42″ Diameter Spectacle Blinds. Piping Technology and Products, Inc. and SWECO Fab, Inc. designed and fabricated 24″ 300 # (ANSI rating), 2 1/2″ thick and 42″ 600 # (ANSI rating), 3 7/8″ thick carbon steel spectacle blinds.
How long does it take to make spectacle blinds?
PT&P/SWECO Fab. can supply these spectacle blinds in any material needed, such as stainless steel, Monel, Inconel and carbon steel. Smooth, mill, machined or serrated finish is also available upon request. PT&P/SWECO Fab. can produce this product in small quantities/sizes in 48 hours if needed.
What’s the difference between line blind and spectacle blind?
These names describe particular devices used to isolate or “turn off” portions of piping systems. Line blinds can be used together with a valve or instead of a valve. At the right, we see an installed spectacle blind in the “open” position. The line blind shown in use on the right is a spectacle blind or figure 8.