API RTJ gaskets

Quick Overview

The API RTJ gaskets also called ring type joint gaskets are heavy duty and high-pressure gaskets largely used in offshore and onshore petrochemical industry, oil-field drilling and completion equipment, and in valves and pipework assemblies, along with some high integrity pressure vessel joints. The API right gasket material must be selected based on chemical compatibility with the media and the hardness of the flange. Generally, the gasket material should be roughly 30 Brinell less than the flange material to ensure sufficient deformation of the gasket without damaging the flange facing.

API RTJ gaskets comply with the ASME B16.20 standards, and are available for ASME B16.5, ASME B16.47 Series A, API 6B, API 6BX flanges.

Types of API RTJ Gaskets

The API RTJ gaskets have different style type such as R type octagonal and Oval, BX and SBX, RX and SRX, IX and AX type ring type joint gaskets

R Type Oval and Octagonal API RTJ Gaskets

The type R metal ring joint gaskets are manufactured according to ASME B16.20 and API 6A. The type R oval configuration was the original design and was followed by the type R octagonal which offered more specific contact areas.

RX RTJ Gaskets

The type RX metal ring joint gaskets are manufactured according to ASME B16.20 and API 6A. The type RX RTJ gasket series is of higher strength materials designed primarily for well-head pressures of 700 bar and beyond.

BX RTJ Gaskets

The BX metal ring joint gaskets are manufactured according to ASME B16.20 and API 6A. The type BX RTJ gasket series is of higher strength materials designed primarily for special applications involving high pressures up to 20,000 psi.

SBX and SRX RTJ Gaskets

Type SRX and SBX RTJ gaskets are the same design as the Type RX and BX gaskets. They are manufactured to API 17D and apply for Subsea Wellhead and Tree Equipment. The S indicates these gaskets have cross-drilled holes to assure that any liquid trapped behind the ring gasket on either side will flow to the I.D. bore. SRX Ring Gaskets usually be designed in 6BX and/or 17D RTJ flanges under water.

Materials of API RTJ Gaskets

API RTJ Gaskets generally are made from soft iron, low carbon steel, alloy steels (such as F5 and 410), stainless steels (including 304, 304L, 316, 316L, 321, 347, 410), and also be designed by some non-ferrous metals, for example, high nickel alloys, super alloy steels and Titanium, etc.

Material	Brinell (Hardness)	Rockwell (Hardness)	Temperature ℃	Abbreviations marker
Soft Iron	90	56	-60 - 500	D
Carbon Steel	120	68	-40 - 540	S
304 SS	160	83	-250 - 540	304
304L SS	160	83	-250 - 540	304L
316 SS	160	83	-200 - 815	316
316L SS	160	83	-200 - 815	316
321 SS	160	83	-200 - 870	321
347 SS	160	83	-200 - 870	347
410 SS	170	86	-40 - 850	410
5Cr-0.5Mo	130		-29 - 650
Copper	80		-100 - 315
Inconel 600	150		-100 - 1095
Incoloy 825	150		-100 - 1095
Monel 400	150		-100 - 760
Titanium	215		-200 - 540
Nickel 200	110		200 - 760
Hastelloy B2	230		-100 - 1095
Hastelloy C276	210		-100 - 1095