Octagonal Ring Joint Gasket: The ring type joint was initially developed for high pressure and temperature applications found in the petroleum industry
Octagonal Ring Joint Gasket
installed inside a ladder type ring groove on the surface of the flange, when screw down the connecting bolt, the axial compression and up and down the ladder type slot 1, produce plastic deformation, forming a ring seal belt, establish the initial seal.After booster, under the action of medium pressure, make the ring gasket radial expansion.Gasket with trapezoidal groove cant post more tightly, self-tightening effect.Medium pressure increases, however, also can make the flange and the connecting bolt deformation, caused by a relative separation between the sealing surface, gasket seal than relative decline, thus, ring gasket can be thought of as a half since the tight closure.
Octagonal metal ring gasket
It mainly match with flange groove is surface contact, compared with the oval ring gasket though with flange groove or not easily, but it can be used again, and because of the cross section is made up of straight line easy processing.At the same time choose octagonal metal ring gasket material should be lower than the flange surface hardness 15 ~ 20 hb
Note
When octagonal type is chosen, the material hardness of the pad should be 15~20HB lower than that of the flange face. It is recommended the
pad is not recycled.
Applicable standards
ANSI B16.5-1973 、 JPI-75-15-70 、 GB 699 、 GB1220 、 JB755 、 HG20633-97
Octa ring gasket drawings
Main materials :
|
Material |
Maximum hardness BRINELL |
Temperature（ ℃ ） |
Abbreviations |
|
|
Brucellosis |
Rockwell |
|||
|
Soft Iron |
90 |
56 |
-60 500 |
D |
|
Low Carbon Steel |
120 |
68 |
-40～540 |
S |
|
304SS |
160 |
83 |
-250 540 |
304 |
|
304LSS |
160 |
83 |
-250 540 |
304L |
|
316SS |
160 |
83 |
-200 815 |
316 |
|
316LSS |
160 |
83 |
-200 815 |
316 |
|
321SS |
160 |
83 |
-200 870 |
321 |
|
347SS |
160 |
83 |
-200 870 |
347 |
|
410SS |
170 |
86 |
-40 850 |
410 |
|
5Cr-0.5Mo |
130 |
|
-29 650 |
|
|
Copper |
80 |
|
-100 315 |
|
|
Aluminum |
35 |
|
-200 425 |
|
|
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 |
|
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