Guide to Selecting JIS B2220 Flanges for Industrial Piping

In piping systems where terminal points or future expansion spaces are required, blind flanges serve as critical components to ensure system integrity and safety. For industrial applications adhering to the JIS B2220 standard, precise flange specification matching forms the foundation of engineering reliability.

The JIS B2220 standard encompasses multiple pressure ratings, with 5K and 10K being the most frequently specified for low-pressure piping systems. When selecting blind flanges—such as those with DN 300 bore diameters—engineers must consider both pressure ratings and material compatibility with the conveyed medium.

For standard industrial water treatment or non-corrosive gas transportation, carbon steels like SS400 and S235JR offer optimal mechanical strength and cost efficiency. In contrast, chemically aggressive environments found in pharmaceutical or petrochemical applications typically require corrosion-resistant alloys such as 316L or 304L stainless steel to maximize equipment service life.

Proper engineering design mandates strict adherence to pressure-temperature ratings, particularly for large-bore applications like DN 300 systems. Flange thickness and sealing surface finish must comply with standard specifications to prevent leakage risks. Through meticulous material selection and installation protocols, operators can significantly reduce maintenance costs while ensuring stable performance in complex industrial pipeline networks.