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SDX ® BOP Stack
Subsea Wellhead Connectors
Features
D
ril-Quip’s
DX® BOP Stack Subsea Connectors
are an excellent choice to safely meet the everchanging requirements for subsea connectors. They are
designed for deep water, high wellhead pressure, deep
wells and long drilling times. DX Connectors are available in a variety of designs and configurations and can
be modified to meet specific customer requirements.
Basic DX models are identified as:
• DX-HAR Connector – pressure rated to 10,000 psi,
with advanced features for high angle release
• DX-15 Connector – pressure rated to 15,000 psi
• DX-DW Connector – pressure rated to 15,000 psi,
with advanced features for deeper water
• SDX-DW Connector – pressure rated to 15,000 psi,
DX-DW Connector designed for the 30" mandrel
subsea wellhead systems
Features:
• High load capacity
• Available with flange or studded connection
• Tight load path through the upper body, latch segments and wellhead
• Annular piston/cam ring design maximizes locking force within a smaller dimensional envelope
• Special seal design and stainless steel surfaces
extend seal life
• Self-locking taper on latch segments offer greater
locking reliability
• Quick unlatching time; meets all international
regulatory requirements
• Primary unlocking force 25% greater than
locking force
• Emergency secondary unlocking force 88% greater
than primary locking force
• Ring gasket profile includes primary metal-to-metal
seal surface with secondary metal-to-metal surface
for emergency use
• Seals on the independent secondary release piston
are not used during normal connector operation
• Design is compatible with existing blowout
preventor hydraulic control systems
• Design offers trouble-free, easy operation
• Field-proven performance
2
This catalog focuses on DX Connectors for subsea
BOP stack applications. Other uses for Dril-Quip
DX and SDX Connectors are:
• Dry Tree Systems (Tie-Back to Floating
Production Platform)
• Subsea Completion Trees
• Export Riser Connector
• Surface BOP Stack Connector
• Flowline Connector
Connector Components
Upper Body
Gasket Retainer/
Release Lever
Indicator Rod
Ring Gasket
Retaining
Mechanism
Primary
Lock Port
Upper
Split Ring
Retractor
Secondary
Unlock Port
Latch
Segment
Spreader
Lower
Split Ring
Retractor
Primary
Unlock Port
Hydrate Diversion Seal
Annular
Piston/Cam Ring
Conversion KIT
Ring
Gasket
Latch
Secondary
Segment Unlatch
Piston
SDX BOP Stack Subsea Wellhead Connector
3
Design and Operations
Design Features Assure Positive Disconnects
DX Connectors incorporate three hydraulic circuits:
• Secondary Unlock
• Primary Lock
The primary locking circuit is optimized to deliver
maximum locking force to the annular piston/cam ring.
• Primary Unlock
In emergency situations, the independent secondary unlock circuit functions a
passive secondary annular piston. The
secondary unlock piston unlocks the
connector with 88% more force than the
primary lock piston.
The primary unlock circuit provides 25% more unlockSecondary
ing force than locking force.
Unlock Piston
Hydraulic
Fluid
Secondary
Secondary
Unlock Piston
Unlock
Piston
Hydraulic
Hydraulic
Fluid
Fluid
Annular
Annular
Piston/Cam
Piston/Cam
Ring
Ring
Locking
Segments
Arrow
Represents
Movement
Annular
Piston/Cam
Ring
Annular
Piston/Cam
Ring
Arrow
Represents
Movement
Locking
Segments
Arrow
Arrow
Represents
Represents
Movement
Movement
Hydraulic
Fluid
Annular
Piston/Cam
Ring
Arrow
Represents
Movement
Locking
Locking
Segments
Segments
Secondary
Unlock Piston
Locking
Segments
Hydraulic
Fluid
DX Connector
in Locked Position
DX Connector
in Unlocked Position
DX Connector
in Unlocked Position
Using the Secondary
Unlock System
2-608267 30” DXDW Connector
Secondary
Unlock Piston
Latching Segments are Automatically Retracted
When the Connector is Unlocked
DX Connectors incorporate
a positive unlocking mechanism. This mechanism ensures
that the latch segments are
fully retracted from the wellhead when the connector is
unlocked. A spreader, attached
to the annular piston/cam
ring, spreads the latching
segments apart when unlock
pressure is applied and the
cam ring moves up. Then the
split ring retractors pull the
latch segments away from
the wellhead.
4
Latch Segment
Locked
Latch Segment
Unlocked and
Automatically
Retracted
Testing and Technical Data
The DX Connector Clamp Design
Prevents Bolt Failure
BOLTS NOT IN
LOAD PATH
The DX Connector is a “clamp segment” type that
behaves as a simple hub and clamp arrangement.
As the segment latches to the wellhead, it clamps
to the DX Connector upper body simultaneously
and creates a closed loop with a near straight load
path. Any loads applied to the connector travel
only through the segment that is made from highly ductile alloy steel. The Dril-Quip DX Connector
has bolts connecting its outer body and cover
plate; however, these bolts are not in the load path.
These bolts are made from ductile API L7 alloy
material, and are treated with baked on Teflon
coating for corrosion protection. The bolts are not
zinc electroplated This simple clamp design of the
DX Connector removes the possibility of a bolt
failure causing loss of connection.
DRIL-QUIP DX CONNECTOR
LOAD PATH
Computer-Designed
Using highly sophisticated design tools, a very
extensive 3-dimensional advanced finite element
analysis (FEA) was carried out over numerous
design iterations to optimize every minute detail
of the profile. The analysis simulates very closely
the connector installation and service conditions and includes preloading and application of
internal/external loads (pressure, bending, tension/compression, and load combinations) while
observing the stress behavior throughout the
connector components. Particular attention has
been paid to achieve uniform load distribution
and minimization of the peak surface stresses on
the interface profiles of the latch segments, wellhead, and upper body which is directly related
to the fatigue performance of the connector. This
advanced technology has allowed the company
to develop an optimized locking profile geometry. Analysis has also been conducted on the DX
gasket to observe the behavior of contact loads
and gasket’s reaction to the internal pressure and
external loads. These results have enabled the
company to create wellhead connector design with
high load capacity, all within the smallest possible
dimensions envelope.
5
DX-DW Connector
DX-DW Connector
Dril-Quip’s SDX-DW Subsea Connector, is pressure rated to 15,000 psi, and is a high-strength,
field-proven BOP stack wellhead connector
designed for deep water, deep wells and long
drilling times. It is easily adaptable to any existing BOP stack with minimal modifications and
is compatible with all BOP stack control systems.
The SDX-DW Connector is designed to sit on a
30"subsea wellhead mandrel. Furthermore, the
connector can accommodate the SDX H-4 locking profile.
New High Fatigue
SDX Locking Profile
Dril-Quip's SDX Connector and SDX locking
profile is a proprietary design engineered specifically for high fatigue resistance and provides
extended service life during drilling and production operations. By modifying tooth profile curvature, the connector was designed to provide
maximum fatigue performance. The high fatigue
resistance is directly attributed to a very significant reduction of stress amplification factors of
all the critical fatigue locations of the connector
and wellhead profile interface.
SDX Profile
DX-DW
SDX Profile
SDH-H4 Profile
SDX-DW Connector 8 up 6 down
SDX
30" Mandrel
SDH H-4
30" Mandrel
Part Number
2-606742
2-604686
Rated Working Pressure
15,000 psi
15,000 psi
Swallow
27.49"
27.860"
Added Stack Height
34.65"
34.33"
Outside Diameter
64.53"
64.53"
Weight
39,000 lbs
39,000 lbs
*Maximum Operating Pressure
4,500 psi
4,500 psi
Fluid Vol. to Latch
15.04 gal
15.04 gal
Fluid Vol. to Unlatch
25.53 gal
25.53 gal
Fluid Vol. for Secondary Unlatch
26.18 gal
26.18 gal
DX-DW Specifications
*Secondary Unlatch Only
6
SDX Profile/30" Mandrel
Pressure End-Load (kips)
Internal Pressure (ksi)
15
10
5
0
0
2
6
8
4
Bending Moment (MM ft-lbf)
Rated Capacity (67% Yield)
Extreme (80% Yield)
10
12
Survival (100% Yield)
Capacities based on 3-D FEA with the following assumptions:
1. Internal pressure acting on 18-3/4" nominal bore with PEL included
2. Preload at 1,500 psi locking pressure = 4.08 million lbf
• Contact DQ Engineering for capacities with various levels of
tension/compression
• Extreme and Survival envelopes are presented for information purposes
SDH-H4 Profile/30" Mandrel
Pressure End-Load (kips)
Internal Pressure (ksi)
15
10
5
0
0
2
4
6
8
Bending Moment (MM ft-lbf)
Rated Capacity (67% Yield)
Extreme (80% Yield)
10
DX-DW SDX Profile
SDX-DW Connect
12
Survival (100% Yield)
Capacities based on 3-D FEA with the following assumptions:
1. Internal pressure acting on 18-3/4" nominal bore with PEL included
2. Preload at 3,000 psi locking pressure = 5.85 million lbf
• Contact DQ Engineering for capacities with various levels of
tension/compression
• Extreme and Survival envelopes are presented for information purposes
7
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