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8/16/2019 Gaskets Information
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12/5/2016 Gaskets Seal s And W el lheads Api Type R R ing Joi nt Gasket - W el l C ontr ol
http://www.netwasgroup.us/well-control-2/gaskets-seals-and-wellheads-api-type-r-ring-joint-gasket.html
Netwas Group Oil » Well Control
Gaskets Seals And Wellheads Api Type R R ing JointGasket
Last Updated on Mon, 11 Apr 2016 | Well Control
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 oct agonal or oval in
cross section. The type 'R' design does not allow face-to-face con tact 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
ENERGISED
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SECTION 6 : WELL CONTROL EQUIPMENT
Figure 6.4.3
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
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Figure 6.4.5
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'
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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
Figure 6.4.6 Figure 6.4.7 Figure 6.4.8
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
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Figure 6.4.10
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
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Figure 6.4.13 Figure 6.4.14
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
SECTION 6 : WELL CONTROL EQUIPMENT
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'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
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 loadingon 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
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section 6 : WELL CONTROL EQUIPMENT
Figure 6.4.18
Figure 6.4.18
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r section 6 : WELL CONTROL EQUIPMENT
Figure 6.4.19
Figure 6.4.19
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SECTION 6 : WELL CONTROL EQUIPMENT
Figure 6.4.20 SPECIFICATIONS FOR BOP FLANGES, RING GASKETS, FLANGE
BOLTS AND NUTS
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Responses
0 0
4 years ago
Where do rx gaskets seal?
Alex
Reply
4 years ago
What are the sealing areas of ring gasket and ring grove?
olga
Reply
3 years ago
What is the benifit of cameron cx gaskets?
Robel
Reply
3 years ago
What is the external pressure rating of a VX vetco ring gasket?
IVANA
Reply
2 years ago
How does a r type ring gasket seal?
james
Reply
2 years ago
Where do API ring grooves seal at?
lodovica
Reply
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1 year ago
Are Cameron AX and Vetco VX ring gaskets interchangable?
christian
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