Blind Flange 
This flange is used to blank off pipelines, valves and pumps, it can also be used as an inspection cover. It is sometimes referred to as a blanking flange.
Standards: ANSI B16.5: 150LB, 300LB, 600LB
DIN: 2527 PN10, 2527 PN16
UNI: 6092 PN10, 6093 PN16
Materials: Carbon steel, stainless steel and alloy steel.