1. What's blind flange usage
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.
2. 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.
3. Blind flange material
Stainless Steel: ASTM A 182, A 240
Grade: F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H,
317, 347, 347H, 904L, Duplex stainless steel UNS S31803, 2205,
Super Duplex stainless steel UNS S32750
Carbon Steel: ASTM A 105, ASTM A 181
Alloy Steel: ASTM A 182, GR F1, F11, F22, F5, F9, F91
Nickel Alloys: Monel 400 & 500, Inconel 600 & 625, Incolloy 800,
825, Hastelloy C22, C276
Copper Alloys: Copper, Brass & Gunmetal
Size: 1/8" NB TO 48"NB.
Class: 150#, 300#, 400 #, 600#, 900#, 1500# & 2500 #.
4. Blind flange standard
ANSI: ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
DIN: DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655,
DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633,
DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
B. S: BS4504, BS4504, BS1560, BS10 |
