Gaskets Seals And Wellheads Api Type R Ring Joint Gasket

The type 'R' ring joint gasket is not energised by internal pressure. Sealing takes place along small bands of contact between the grooves and the gasket, on both the OD and ID of the gasket. The gasket may be either octagonal or oval in cross section. The type 'R' design does not allow face-to-face contact between the hubs or flanges, so external loads are transmitted through the sealing surfaces of the ring. Vibration and external loads may cause the small bands of contact between the ring and the ring grooves to deform the plastic, so that the joint may develop a leak unless the flange bolting is periodically tightened. Standard procedure with type 'R' joints in the BOP stack is to tighten the flange bolting weekly.

Figure 6.4.1

Figure 6.4.1

Ring Joint Flange
Ring Type Gasket
ENERGISED

SECTION 6 : WELL CONTROL EQUIPMENT

Figure 6.4.3

Clamping Force Ring Joint Octagonal

SECTION 6 : WELL CONTROL EQUIPMENT

API Type 'RX' Pressure-Energised Ring Joint Gasket

The 'RX' pressure-energised ring joint gasket was developed by Cameron Iron Works and adopted by API. Sealing takes place along small bands of contact between the grooves and the OD of the gasket. The gasket is made slightly larger in diameter than the grooves, and is compressed slightly to achieve initial sealing as the joint is tightened. The 'RX' design does not allow face-to-face contact between the hubs or flanges. However, the gasket has large load-bearing surfaces on the inside diameter, to transmit external loads without plastic deformation of the sealing surfaces of the gasket. It is recommended that a new gasket be used each time the joint is made up.

Figure 6.4.4

Figure 6.4.4

Well Control
Figure 6.4.5
Groove Joint Gasket

SECTION 6 : WELL CONTROL EQUIPMENT

API Type 'BX' Pressure-Energised Ring Joint Gasket

Sealing takes place along small bands of contact between the grooves and the OD of the gasket. The gasket is made slightly larger in diameter than the grooves, and is compressed slightly to achieve initial sealing as the joint is tightened. Although the intent of the 'BX' design was face-to-face contact between the hubs and flanges, the groove and gasket tolerances which are adopted are such that, if the ring dimension is on the high side of the tolerance range and the groove dimension is on the low side of the tolerance range, face-to-face contact may be very difficult to achieve. Without face-to-face contact, vibration and external loads can cause plastic deformation of the ring, eventually resulting in leaks. Both flanged and clamp hub 'BX' joints are equally prone to this difficulty. The 'BX' gasket frequently is manufactured with axial holes to ensure pressure balance, since both the ID and the OD of the gasket may contact the grooves.

In practice, the face-to-face contact between hubs or flanges is seldom achieved.

Figure 6.4.6 Figure 6.4.7 Figure 6.4.8

Preformed Control Joint Gaskets

Figure 6.4.6 Figure 6.4.7 Figure 6.4.8

Well Control

SECTION 6 : WELL CONTROL EQUIPMENT

API Face-to-Face Type 'RX' Pressure-Energised Ring Joint Gasket

The face-to-face 'RX' pressure-energised ring joint gasket was adopted by API as the standard joint for clamp hubs. Sealing takes place along small bands of contact between the grooves and the OD of the gasket. The gasket is made slightly larger in diameter than the grooves, and is compressed slightly to achieve initial sealing as the joint is tightened. Face-to-face contact between the hubs is ensured by an increased groove width, but this leaves the gasket unsupported on it's ID. Without support from the ID of the grooves, the gasket may not remain perfectly round as the joint is tightened. If the gasket buckles or develops flats, the joint may leak.

This type of gasket has not been accepted by the industry and is seldom used.

Figure 6.4.9

Figure 6.4.10

Figure 6.4.9

Ring Type Gasket

Figure 6.4.10

Groove Joint Gasket
ENERGISED

SECTION 6 : WELL CONTROL EQUIPMENT

'CIW' Type 'RX' Pressure-Energised Ring Joint Groove

CIW modified the API face-to-face type 'RX' pressure-energised ring joint grooves to prevent any possible leaking caused by the buckling of the gasket in the API groove. The same API face-to-face type 'RX' pressure energised ring joint gaskets are used with these modified grooves. Sealing takes place along small bands of contact between the grooves and the OD of the gasket. The gasket is made slightly larger in diameter than the grooves, and is compressed slightly to achieve initial sealing as the joint is tightened. The gasket ID will also contact the grooves when it is made up. This constraint of the gasket prevents any possible leaking caused by the buckling of the gasket. Hub face-to-face contact is maintained within certain tolerances. The maximum theoretical stand-off from the stack-up of the tolerances of the gasket and the groove is 0.022 inches.

Face-to-face contact cannot be assured with this ring/groove combination. This ring is seldom found in use. The 'CX' ring accomplishes the intent of the 'RX' face-to-face design.

Figure 6.4.13 Figure 6.4.14

Figure 6.4.13 Figure 6.4.14

Ring Gaskets

SECTION 6 : WELL CONTROL EQUIPMENT

Type 'AX' and 'VX' Pressure-Energised Ring Joint Gasket

The 'AX' pressure-energised ring joint gasket was developed by Cameron Iron Works. The 'VX' ring was developed by Vetco.

Sealing takes place along small bands of contact between the grooves and the OD of the gasket. The gasket is made slightly larger in diameter than the grooves, and is compressed slightly to achieve initial sealing as the joint is tightened. The ID of the gasket is smooth and is almost flush with the hub bore. Sealing occurs at a diameter which is only slightly greater than the diameter of the hub bore, so the axial pressure load on the connector is held to an absolute minimum. The belt at the centre of the gasket keeps it from buckling or cocking as the joint is being made up. The OD of the gasket is grooved. This allows the use of retractable pins or dogs to positively retain the gasket in the base of the wellhead or riser connector when the hubs are separated. The gasket design allows face-to-face contact between the hubs to be achieved with minimal clamping force. External loads are transmitted entirely through the hub faces and cannot damage the gasket.

Figure 6.4.13 Figure 6.4.14

Cameron GasketCameron Gasket

SECTION 6 : WELL CONTROL EQUIPMENT

'CIW' Type 'CX' Pressure-Energised Ring Joint Gasket

The 'CX' pressure-energised ring joint gasket was developed by Cameron Iron Works. Sealing takes place along small bands of contact between the grooves and the OD of the gasket. The gasket is made slightly larger in diameter than the grooves, and is compressed slightly to achieve initial sealing as the joint is tightened. The gasket is patterned after the 'AX' and 'VX' gasket, but is recessed, rather than being flush with the well bore, for protection against keyseating. The gasket seals on approximately the same diameter as do the 'RX' and 'BX' gaskets. The belt at the centre of the gasket keeps it from buckling or cocking as the joint is being made up. Since the 'CX' gasket is protected from keyseating, it is suitable for use through the BOP and riser system, except at the base of the wellhead and riser connectors. The gasket design allows face-to-face contact between the clamp hubs or flanges to be achieved with minimal clamping force. External loads are transmitted entirely through the hub faces and cannot damage the gasket.

Figure 6.4.15 Figure 6.4.16

Figure 6.4.15 Figure 6.4.16

Ring Gaskets

section 6 : WELL CONTROL EQUIPMENT

Application of Type 'AX', 'VX' and 'CX' Pressure-Energised Ring Joint Gaskets

The 'AX', 'VX' and 'CX' face-to-face pressure-energised ring gaskets allow face-to-face contact between the hubs to be achieved with minimal clamping force. The 'AX' and 'VX' gasket is used at the base of the wellhead and riser connector when the hubs are separated. The 'AX'/'VX' design ensures that axial pressure loading on the connector is held to an absolute minimum. The 'AX' gasket also is suitable for side outlets on the BOP stack, since these outlets are not subject to keyseating. The 'CX' gasket is recessed for protection against keyseating. The 'CX' gasket is suitable for use throughout the BOP and riser system, except at the base of the wellhead and riser connector.

Figure 6.4.17 HYDRIL DRILLING SPOOL DATA

Figure 6.4.17 HYDRIL DRILLING SPOOL DATA

Drilling Spool Dimensions

section 6 : WELL CONTROL EQUIPMENT

Figure 6.4.18

Figure 6.4.18

Gasket Ring Types For Wellhead

r section 6 : WELL CONTROL EQUIPMENT

Figure 6.4.19

Figure 6.4.19

Well Control Equipment

SECTION 6 : WELL CONTROL EQUIPMENT

Figure 6.4.20 SPECIFICATIONS FOR BOP FLANGES, RING GASKETS, FLANGE BOLTS AND NUTS

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Responses

  • Alex
    Where do rx gaskets seal?
    8 years ago
  • olga
    What are the sealing areas of ring gasket and ring grove?
    7 years ago
  • Robel
    What is the benifit of cameron cx gaskets?
    7 years ago
  • IVANA
    What is the external pressure rating of a VX vetco ring gasket?
    7 years ago
  • james
    How does a r type ring gasket seal?
    5 years ago
  • lodovica
    Where do API ring grooves seal at?
    5 years ago
  • christian
    Are Cameron AX and Vetco VX ring gaskets interchangable?
    5 years ago
  • Lana
    What are ring gaskets used for in drilling?
    3 years ago
  • mika
    How do R54 Ring Gaskets seal?
    7 months ago
  • ralph loewe
    How rX ring gasket works?
    3 months ago
  • hildigrim
    How does a BX seal work?
    26 days ago

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