How RF and RTJ sealing differ

Both designs can provide reliable service when correctly specified, machined, assembled and maintained. Neither facing compensates for inadequate bolting, misalignment or uncontrolled external loads.

When RTJ is commonly specified

RTJ connections are often found in higher-pressure refinery, hóa dầu, offshore and oil-and-gas systems. The metal ring and groove arrangement can suit demanding joint requirements, but selection must follow the project line class and the available facing provisions for the selected standard and class.

Installation quality is critical. The ring material and profile must be correct, grooves must be clean and undamaged, and the flanges must be aligned. A reused or incorrect ring can compromise the seal even when the flange material and class are correct.

Compatibility and conversion traps

An RF flange should not be bolted to an RTJ flange as a normal field solution. The facing geometry and sealing concept differ. Converting a joint requires engineering approval, compatible replacement components and verification of dimensions, rating, miếng đệm, bolting and connected equipment.

Buyers should state the exact facing and any groove designation required by the project. “RTJ flange” by itself may still omit the standard, NPS, lớp học, vật liệu, loại mặt bích, groove or ring reference, bore and finish.

Inspection and ordering checklist

• ASME standard, NPS, class and flange type
• RF or RTJ facing and required finish
• RTJ groove and ring-gasket designation where applicable
• ASTM material specification and exact grade
• Mating-flange or equipment-nozzle details
• Face or groove dimensional inspection
• Protection against corrosion and handling damage
• Bolting, miếng đệm, MTC, Yêu cầu về PMI và NDE

Keep machined faces protected through shipping and storage. Damage in an RTJ groove or across an RF sealing path can be more consequential than rust on a non-sealing exterior surface.