O-ring gasket 95 series

steelflange

Metallic Ring-Joints are produced according to the standard established by the American Petroleum Institute, API 6A and API 17D and the American Society of Mechanical Engineers, ASME B16.20, for applications at elevated temperatures and/or pressures. A typical application of Ring-Joints is the “Christmas Tree” used in oil fileds. The seal is obtained in a line of contact by a wedge action with high seating pressures, thus forcing the gasket material to flow. The small sealing area with high contact pressure results in great reliability. However the contact surfaces of the gasket and the flange should be carefully finished. Some styles of Ring-Joints are pressure activated, that is, the greater the pressure the better the sealability. Style 950 Style 950, which is frequently referred to as the oval ring, was the gasket that was initially standardized. Later developments resulted in other styles. If the flange was designed using the older version of the gasket standard, for use with an oval ring, then it should be used only with style 950 gaskets. ringjoint Style 951 Style 951 has an octagonal section as shown in the Figure on the right. Style 951 has better sealing performance than Style 950 and its use is recommended for new applications. For this style flanges are manufactured according to new issues of ASME and API standards and have grooves with a profile designed to work with both 950 and 951. ringjoint Style 952 BX Style BX gasket has a square cross section with bevelled corners as shown in the Figure on the right. Designed for use only in flanges API 6BX. Style BX is recommended for pressures from 5000psi (34.5MPa) up to 20000 psi (138MPa).