Specification of blind flange

The specifications of blind flange mainly include size range (DN15-DN1500), pressure rating (Class 150 to 2500lb), material standards (such as ASTM A105, A182), and sealing surface types (such as convex RF, flat FF), designed according to international standards such as ASME B16.5. ‌‌
Size range and pressure rating
Size: The nominal diameter covers from DN15 (1/2 inch) to DN1500 (60 inch), with commonly used specifications ranging from DN15 to DN1200. ‌‌
Pressure rating: including Class 150, 300, 600, 900, 1500, 2500lb, corresponding to PN6 to PN25 materials and standards
Material:
Carbon steel: ASTM A105, 20 #, etc. ‌‌
Stainless steel: ASTM A182 F304, 316, etc. ‌‌
Alloy steel and low-temperature steel: ASTM A182 F11, A350 LF2, etc. ‌‌
Standards: ASME B16.5, ASME B16.47, MSS SP-44, and EN1092