高圧用途向けの RF フランジと RTJ フランジ

技術ニュースレビュー済み: 3 8月 2026による SASA FLANGE 技術コンテンツチーム

直接の答え

RF flanges seal by compressing a gasket against two raised faces. RTJ flanges seal by deforming a metallic ring gasket inside matched grooves. RTJ is commonly selected for severe high-pressure or high-temperature services when the line class and mating equipment require it, but it is not automatically better for every application. 対面, ガスケット, class and mating geometry must match exactly.

重要なポイント

RF and RTJ describe different sealing systems, not cosmetic face options.
An RTJ joint requires two compatible grooves and the specified metal ring.
High pressure alone does not decide the facing; the line class and service do.

How RF and RTJ sealing differ

特徴	盛り上がった顔 (RF)	リング型ジョイント (RTJ)
Sealing element	Compressed gasket on raised surfaces	Metal ring gasket seated in matched grooves
Contact pattern	Broader gasket contact area	Concentrated metal-to-metal ring contact
Common use	Wide range of process and utility duties	Severe pressure/temperature duties defined by line class
Critical inspection area	Face flatness, finish and damage	Groove profile, 仕上げる, corrosion and mechanical damage

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, 石油化学, 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, ガスケット, 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, クラス, 材料, フランジタイプ, groove or ring reference, bore and finish.

Inspection and ordering checklist

ASME規格, NPS, クラスとフランジの種類
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, ガスケット, MTC, PMI and NDE requirements

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.

よくある質問

Is RTJ always better than RF at high pressure?

いいえ. RTJ is common in severe service, but the approved standard, クラス, line class, gasket strategy and mating equipment determine the correct facing.

Can an RF flange mate with an RTJ flange?

They are not a normal compatible pair. Any conversion requires engineered replacement or an approved joint solution.

Can an RTJ ring gasket be reused?

Metal rings are generally treated as single-use sealing elements unless the governing procedure explicitly permits otherwise.

参照される主な規格

規格は発行者のページと照合してチェックされました。 3 8月 2026. 必ずプロジェクトで指定されたエディションを購入して適用してください.

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