As B16.5 Flange flanges lack a weld bevel and enable the pipe to be altered in length in relation to the flange’s... moreAs B16.5 Flange flanges lack a weld bevel and enable the pipe to be altered in length in relation to the flange’s position, the slip-on flange is an easy and excellent substitute for a weld neck. The slip-bore will provide plenty of room for the complementary pipe. This gives the welder and fabricator enough room to operate while making the connection. The use of slip-on flanges type produced by manufacturers in India in lower pressure applications is widespread.