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RTJs are designed to be used in high pressure applications and can be manufactured from a number of materials to suit the process media and the flange materials. RTJs are precision machined metallic rings which are designed to be used with API 6B, ASME B16.5 and API 6BX (dependent on the gasket style) flanges. RTJs are often used in offshore applications and certain styles can be adapted for subsea installation.
- Metallic ring joint gaskets are heavy duty, high-pressure gaskets largely used in offshore petrochemical applications. They are precision-engineered components designed to be used in conjunction with precision-machined flanges. All our Ring Joints are manufactured according to ASME B16.20 and API 6A.
- The gasket material is selected on a number of grounds primarily; chemical compatibility with the media and the hardness of the flange. The gasket material ideally needs to be roughly 30 Brinell less than the flange material to ensure sufficient deformation of the gasket without damaging the flange facing.
Common Materials | Material | Britnell Hardness | Temperature Limitations | Identification | | Soft Iron | 90 | -60 to 500oC | D | Low
Carbon Steel | 120 | -40 to 500 oC | S | 4-6% Cr
1/2% Mo | 130 | -250 to 500 oC | F5 | | 304 | 160 | -250 to 550 oC | S304 | | 316 | 160 | -110 to 550 oC | S316 | | 321 | 160 | -250 to 550 oC | S321 | | 347 | 160 | -250 to 550 oC | S347 | | 410 | 170 | -20 to 550 oC | S410 | | Monel (N0440) | 135 | 450 oC | N04400 | | UNS N08904 | 180 | 400 oC | 904L | | Incoloy 625 | - | 450 oC | 625 | | Incoloy 825 | - | 450 oC | 825 | | Hastelloy C276 | - | 450 oC | C-276 | | Titanium | - | 450 oC | TI | | Type | Nominal
Pipe Size | Class Rating | Type R
Oval & Octagonal | 1/2" to 24"
26" to 36"
1 ½” to 20” | 150 to 2500 ASME B16.20
300 to 900 ASME
B16.20 Series A API 6A | | Type RX | 1 1/2" to 24"
26" to 36"
1 ½ " to 20" | 720 to 5000 ASME B16.20
300 to 900 ASME B16.20 Series A
API 6A | | Type BX | 1 11/16" to 21 1/4" | 5000 to 20000 ASME B16.20 | |
