RTJ vs Raised Face Flanges
/ 6 min read
Why a ring joint seals where a sheet gasket cannot, what it costs you in maintenance access, and how to choose between them.
Blog
Ring joint sealing, AWWA waterworks classes, and isolation hardware.
The word ring covers three unrelated flange families, and most of the mistakes come from mixing them up. These articles work through each one.
AWWA C207 Class B, D, E and F Explained
/ 5 min read
Four classes, four water working pressures, and only two of them are ring flanges. Plus the drilling overlap with ASME that causes most of the confusion.
Selecting R, RX and BX Ring Joint Gaskets
/ 6 min read
Octagonal versus oval, what pressure-energized means, why BX rings have a vent hole, and how to pick the ring material and hardness.
Lap Joint Flanges and Backing Rings
/ 5 min read
The loose ring that lets you spin the bolt holes into line, and lets you buy the expensive alloy only where the fluid touches it.
Spectacle Blinds, Paddle Blinds and Ring Spacers
/ 6 min read
Positive isolation hardware, why a closed valve is not isolation, how blind thickness is calculated, and the bolt length nobody remembers.
Machining and Inspecting Ring Joint Grooves
/ 5 min read
Surface finish, why radial tool marks leak, flank angle tolerance, and the gauges that prove a groove is good before it goes in the line.
More technical reference material is published on Texas Flange.
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