The 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.
Specifications:

Blind Flanges, BL Flange
Size: 1/2” to 60”, DN 12mm to DN 1500mm
Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250
Facing: RF / RTJ
Material:
Cabon steel: A105, A350 LF2
Stainless steel: A182 F304/F304L/F316/F316L/F321
Alloy steel: F11, F12
Packing: plywood case and plywood pallet
Standards, Dimensions & Weight
AWWA Flange Charts and Drawings
ASME/ANSI B16.5 Class 150 BL
ASME/ANSI B16.5 Class 300 BL
ASME/ANSI B16.5 Class 600 BL
ASME/ANSI B16.5 Class 900 BL
ASME/ANSI B16.5 Class 1500 BL
ASME/ANSI B16.5 Class 2500 BL
ASME B16.47 Series A/MSS SP-44 Class 150 BL
ASME B16.47 Series A/MSS SP-44 Class 300 BL
ASME B16.47 Series A/MSS SP-44 Class 600 BL
ASME B16.47 Series A/MSS SP-44 Class 900 BL
ASME B16.47 Series B/API 605 Class 75 BL
ASME B16.47 Series B/API 605 Class 150 BL
ASME B16.47 Series B/API 605 Class 300 BL
ASME B16.47 Series B/API 605 Class 600 BL
ASME B16.47 Series B/API 605 Class 900 BL
DIN 2527 PN10
DIN 2527 PN16