Socket weld flange : SWRF flanges have a pipe that goes into the flange Using the exact same interior diameter (I.D.) as the pipe These flanges are broadly useful for ambient and higher temperature solutions in https://minaykgk483584.blog-gold.com/35084484/how-much-you-need-to-expect-you-ll-pay-for-a-good-carbon-steel-flanges-in-uae