RING JOINT GASKETS
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Ring joint gaskets (RTJ) are designed for high pressures and depending on the profile of the ring they are able to seal up the working pressure up to 1500 bar and temperatures up to 1000 °C.

Due to a small contact/sealing surface (metal/metal) and a suitable composition of materials, the contact surfaces of the flange together with the correct choice of the gasket material the ring joint gaskets provide an excellent tightness of the joints.

Ring joint gaskets are offered in two basic profiles: oval - KT 21-R, or octagonal - KT 31-R.

For higher pressures from 700 to 1500 bar, we recommend applying types KT 51-RX and KT 61-BX.

To ensure a good sealing effect of the ring joint gaskets it is necessary to pay close attention to the surface treatment at the point of the contact of the ring and the contact surface of the flange.

In case of leaks and the impossibility to seal up the flange joint using RTJ we can offer a solution by means of the VCS system (Very Critical Services).

Standard profiles shapes

RTJ KT 11

circular cross section

RTJ KT 21-R

oval cross section

RTJ KT 31-R

octagonal cross section

RTJ KT 41-L

lens cross section

RTJ KT 51-RX

octagonal cross section with spec. shape

RTJ KT 61-BX

octagonal cross section with hole

STANDARD METAL MATERIALS

material AISI / ASTM specification acc. to EN 10027-1 specification acc. to EN 10027-2 BS ČSN/CZ temperature (°C) hardness density
min max max HB max HV (g/cm3)
carbon steel 238-C RSt. 37.2 CS 1.0038 D/40B 11 375 -40 +500 90 56 7,85
low carbon steel - M2 / ARMCO 1.1003 S/LCS - -60 +500 120 68 7,85
F5 (5Cr 1/2 Mo) A182-F5 12CrMo 195 1.7362 - - -40 +650 130 72 7,83
stainless steel 304 X5CrNi 18 10 1.4301 304S 15/16/31 17 240 -250 +550 160 83 7,9
stainless steel 304L X2CrNi 19 11 1.4306 304 S11 17 249 -270 +550 160 83 7,9
stainless steel 309 X15CrNiSi 20 12 1.4828 309 S24 17 251 -110 +1000 160 83 7,9
stainless steel 316 X5CrNiMo 17 12 2 1.4401 316 S31/33 17 346 -200 +550 160 83 7,9
stainless steel 316L X2CrNiMo 18 14 3 1.4404 316 S11/13 17 349 -200 +550 160 83 7,9
stainless steel 316Ti X6CrNiMoTi 17 12 2 1.4571 320 S31 17 348 -270 +550 160 83 7,9
stainless steel 321 X6CrNiTi 18 10 1.4541 321 S12/49/87 17 247 -270 +550 160 83 7,9
stainless steel 347 X10CrNiNb189 1.4550 347S31 - -250 +500 160 83 7,9
stainless steel 410 X6Cr13 1.4000 410S21 17 020 -20 +850 170 86 7,8

DIMENSIONS

RTJ style standards for RTJ used with flanges
RTJ standard flange standard
R ASME B16.20 / API 6A / ISO 7483 ASME B16.5 / ASME B16.47-A / BS 1560 / MSS-SP44 / API 6A/6B / ISO 7005
RX ASME B16.20 / API 6A ASME B16.5 / BS 1560 / MSS-SP44 / API 6B / ISO 7005
BX ASME B16.20 / API 6A API 6A-6BX

Table of recommended Seating stress

material recommended seating stress at 20°C
AISI/ASTM min (N/mm2) opt (N/mm2) max (N/mm2)
carbon steel D 235 350 525
low carbon steel LCS/S 265 400 600
A182 F5 A182 F5 400 600 900
stainless steel 304 335 500 750
stainless steel 316 335 500 750
stainless steel 321 335 500 750
stainless steel 347 335 500 750




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