Blind flange

A Blind Flange is used to close ends of piping systems. It is a kind of round plate with no center hold but with all the proper bolt holes. This blind Flange is available in various sizes and materials and is used to provide positive closer on the ends of pipes, valves or equipment nozzles.
This flange helps in easy access to a line once it has been sealed. The blind flange is sometimes custom made or machined to accept a nominal sized pipe to which reduction is being made. This reduction can be a threaded reduction or welded reduction.
Features of blind flanges:
Some important features of blind flanges are as follows:
·Blind flanges are sometimes supplied with NPT fittings which allow pressure test connections to be fitted.
·They are used to blank off the ends of pipe.
·They are also used to blank off the ends of valves and pressure vessel opening.
·Considering factors like internal pressure and bolt loading, blind flanges, especially in the larger sizes, are the most highly stressed of all types of flanges.
·Since the maximum stresses in a blind flange are bending stresses at the center, they can safely be allowed to be higher than in other types of flanges.
·Blind flanges are made to fit standard pipes in all sizes.

Slip-on flanges are a popular type of pipe flanges. These are type of flanges that slide over the end of piping and then welded in place. These flanges are ideal for lower pressure applications. These are easily fitted and welded into different pipes. Welding reduces fabrication costs of these pipes. These are available in wide variety of sizes and applications.
Advantages of slip on flanges:
·Low cost installation
·Less time needed to spent on ensuring the accuracy of the cut pipe
·They are somewhat easier to align
·The slip-on flanges have low hub because the pipe slips into the flange before welding
·The flange is welded both inside and outside to provide sufficient strength
·They prevent leakage
Weld Neck Flanges are a very common type of pipe flanges used in various industrial applications. They have a long tapered hub and are often used for high pressure applications.
Key Features:
·This is the most common type of high pressure pipe flange.
·They are distinguished from other types of pipe flanges by their long tapered hub and gentle transition of thickness in the region of the butt weld joining them to the pipe.
·The long tapered hub provides an important reinforcement of the Weld Neck Flange proper in terms of strength and resistance to dishing.