Stewart and Stevenson

Stewart and Stevenson provide a complete range of the following drilling products:

• Marine Riser Systems and Floatation Equipment
• Stripper Assemblies
• Check Valves
• Surface Test Trees and Accessories
• Choke and kill Manifold Systems
• Detroit Diesel and Electromotive
• Diesel Generator Sets
• Wellhead and Drill through equipment. Eg: Casing heads, Casing spools, Casing hangers, Tubing heads, Tubing hangers, Secondary seals, Tree caps

Gate Valves – Manual and Hydraulic
The Foley type “QF” and “QFP” gate valves have been designed to meet or exceed API standards, NACE MR-01-75, DNV and other special customer specifications. The valves are very useful for a wide range of land or offshore applications and are available in a wide range of sizes, working pressures and trims and offer such advantages as:

• Size, range of 2.1/16" to 7.1/16"
• Pressure range of 2000-15000 psi
• Service range for H₂S or CO₂ and a wide range of fluids and solids
• One piece gate with non-rising stem
• Bi-directional sealing valves seal against pressure in either direction
• Backseat stem to allow packing replacement without production loss
• Standard valve converts into a spring close or a hydraulically actuated safety valve
• Gate/Seat assembly allows easy replacement with conventional tools.
• Robust all forged-steel bodies with a wide range of connections
• A wide range of actuators including manual, hydraulic and pneumatic
• Hard-faced and lapped gates and seats provide a superior metal to metal seal.

Choke Valves
The “QF2” positive and adjustable chokes come in sizes 2.1/16" to 4.1/16" and working pressures from 5000-15,000 psi with the following design features:

• Available in a maximum 2" orifice in positive and adjustable chokes
• Robust forged steel body
• Adjustable chokes have stainless steel stem and seat with tungsten carbide tip and insert for long field life
• Manufactured according to NACE and API standards
• Available in PSL levels 1, 2 and 3
• Available in most trims
• Manufactured under the quality standard of ISO 9001
• Chokes can be actuated manually, pneumatically or hydraulically

A complete range of drilling choke systems tailored to the customers’ needs and requirements can also be provided.

Stewart and Stevenson also provide a range of Well Services which have been field proven. Their experience with these designs, and over the years in the oilfield, allows Stewart and Stevenson to service, repair and provide spare parts for these products or those produced by other manufacturers.

RAM type Blowout Preventer (BOP)
Advanced engineering and manufacturing practices have produced the Stewart and Stevenson Type “Q” ram BOPs for surface and sub-sea drilling applications, for a wide range of bore sizes and working pressures.

The Type “Q” ram BOP has a wide choice of connection types and body styles.

The top, bottom and outlet connections can be specified as flanged, hubbed or studded. Body styles can be specified as single, double or triple. These choices give the maximum flexibility to meet customer requirements.

The Type “Q” ram BOP design incorporates many features that enhance safety, reduce maintenance and provide flexibility.

• Bonnets are hydraulically opened to provide access for ram or ram seal change.
• Well bore pressure provides additional sealing when rams are closed.
• Design simplicity allows easy replacement of all seals and major parts when required.
• The design allows rams to be manually locked if hydraulic system fails and conditions require ram closure.
• All metal areas, parts and seals are resistant to H2S.
• Type “Q” Bop’s are manufactured in accordance with the latest API standards and under the quality standards of ISO 9001.

Annular BOP Details
The Type “S” annular BOPs provide a quick, positive sealing action to keep drilling fluids in the well during well control situations. It allows the maximum choice of connections and body styles. The bottom connection can be specified as flanged, hubbed or studded. The body style can be specified as screwed or latched head. It also incorporates features that enhance safety, reduce maintenance requirements and provide flexibility.

• Manufacturing and quality standards ensure high quality and safety standards for the intended application.
• Only two moving parts (piston and packing element) provide a dependable, efficient and low maintenance product.
• Well bore pressure assists the piston in energizing and effecting a packing element seal.
• Design simplicity allows replacement of all seals and major parts when required.
• All metal areas, parts and rubber goods exposed to well fluids are resistant to H2S
• Type “S” Annular BOPs are manufactured in accordance with the latest API specifications and under the quality standards of ISO 9001.

Coiled tubing and wireline BOPs are also part of our product range.

BOP Control System
The Koomey division of Stewart and Stevenson was the inventor of the modern BOP control system with its development in 1952. Today Stewart and Stevenson manufactures control systems to meet the many needs of the industry. A typical control system is equipped with:

• 11 gallon, 3000 psi wp accumulator bottles, ASME coded and stamped. (Additional bottle sizes and pressures are available as well as different certifying authorities such as Lloyds and DNV).
• Electric motor driven triplex pump assembly with motor starter and automatic switch all explosion proof.
• Fluid control manifold with air cylinders for remote control panels.
• Pressure transmitters and transmission of signals to remote control panels.
• Failsafe, pressure reducing and regulating valve (with override) to control hydraulic pressure to annular type BOP.
• Air or electric remote control panels.
• A complete set of safety alarms.

Accessories also include, diverter control panels, high pressure test units and chart recorder assemblies and crown block safety systems.

Stewart and Stevenson’s wide experience of design and operation of these systems allows us to provide full service and spare parts back-up for systems manufactured by ourselves and other companies.