STP400 Plunger pump

Technical Specifications

Performance Data (Typical):

Applications

The STP400 Plunger Pump is deployed across a broad spectrum of oilfield operations:

• Cementing Operations – Pumping cement slurry for well completion, including self-dispensing of cement slurry, slurry pumping, displacing slurry, and pressure testing

• Acidizing Operations – Pumping acid solutions for well stimulation and formation treatment

• Fracturing Operations – High-pressure injection of fracturing fluids for reservoir stimulation

• Sand Control – Gravel packing and sand control operations

• Well Killing – High-pressure fluid injection for well control

• Well Washing – Cleanout and flushing operations

• Circulating Operations – Fluid circulation in drilling and workover operations

Product Types

SJ Petro offers the STP400 and related plunger pumps in a variety of configurations:

By Power Rating:

1. STP400 (400 bhp) – High-performance triplex plunger pump for cementing, acidizing, fracturing, and sand control.

2. TPH400 (600 bhp) – Higher-capacity triplex pump for demanding well service applications.

3. TPD/TPE 600 (600 bhp) – Triplex pump designed specifically for cementing and acidizing operations.

4. 3ZB Series – Including 3ZB-265 (350 hp), 3ZB-670 (900 bhp), and 3ZB-1340 models.

By Mounting Configuration:

5. Standalone Pumps – Individual pump units for integration into custom skids or packages.

6. Skid-Mounted Pump Packages – Complete pumping packages with engine, transmission, and controls on a single skid.

7. Truck-Mounted Pump Packages – Integrated into truck-mounted cementing and well service units.

By Drive Type:

8. Diesel-Driven Pumps – Powered by diesel engines with mechanical or hydraulic transmissions.

9. Electric-Driven Pumps – Variable frequency motor drive for quiet, emissions-free operation.

OEM & Customization Solutions

Every operation presents unique challenges, and SJ Petro's engineering team delivers tailored solutions through comprehensive OEM and customization capabilities:

• Plunger Size Selection – Choose from multiple plunger sizes to achieve the precise pressure and flow rate combination for your operation

• Fluid End Material – Specify corrosion-resistant materials for aggressive fluid environments

• Fluid End Configuration – Customize suction and discharge connection interfaces to match your piping requirements

• Power System Integration – Select diesel engine or electric motor drive with your preferred specifications

• Skid Design – Custom skid dimensions, lifting points, and layout for offshore or onshore installation

• Certification – Arrange API, DNV, or other certifications for international or offshore operations

• Wear Part Customization – Customize plungers, packing, valves, and seats to match your specific operating conditions

Why Choose SJ Petro?

World-Leading Pump Manufacturer

SJ Petro is the world's most famous manufacturing base for petroleum drilling and production equipment. We are the industry standard setter for cementing equipment and plunger pumps in China, recognized as a leading manufacturer of high-pressure plunger pumps.

Over 30 Years of Pumping Expertise

SJ Petro began developing cementing equipment in the 1980s. With more than 30 years of continuous engineering and manufacturing experience, we have mastered the design and production of series plunger pumps, mixing control systems, and complete cementing units.

Complete In-House Manufacturing

SJ Petro has established seven production lines for drawworks, gear boxes, cylinders, masts, high pressure manifolds, plunger pumps and post treatment, and three assembly lines for drilling rigs, workover rigs, and cementing and fracturing equipment. Annual production capacity includes over 5,000 plunger pumps.

Advanced Materials Technology

Through fundamental research on pump body materials and optimized structural design, SJ Petro has developed high-strength pump heads with 50% improved toughness and 100% improved hardenability. Pump body service life is twice that of comparable advanced products.

"Million-Stroke” Quality Assurance

Every SJ Petro plunger pump undergoes "million-stroke” type testing before release, ensuring reliable performance in the field.

API-Certified Quality

SJ Petro holds API, ISO9001, and HSE management system certifications.

Proven Global Track Record

SJ Petro plunger pumps and equipment have been exported to Canada, Mexico, Kazakhstan, Turkmenistan, Syria, Cuba, and many other countries.

Interchangeable Parts – Global Serviceability

SJ Petro's plunger pumps feature wear parts that are interchangeable with major international brands. This ensures easy maintenance and global parts availability.

One-Stop Solution Provider

Beyond manufacturing, we offer equipment inspection, testing, and major overhaul services. From initial design to field service and spare parts supply, SJ Petro delivers complete oil and gas exploration and production equipment solutions.

Frequently Asked Questions

Q: What is the STP400 plunger pump?

A: The STP400 is a 400 bhp horizontal triplex plunger pump designed for intermittent well service applications including cementing, acidizing, fracturing, sand control, and well killing.

Q: What is the maximum input power of the STP400?

A: The STP400 is rated at 400 bhp maximum input power.

Q: What is the maximum rod load?

A: The STP400 has a maximum rod load of 120,000 lbs.

Q: What plunger sizes are available?

A: The STP400 is available with plunger diameters ranging from 3-3/4″ to 4-1/2″.

Q: What is the stroke length?

A: The STP400 has a stroke length of 127 mm (5″).

Q: What is the difference between the STP400 and TPH400?

A: The STP400 is rated at 400 bhp, while the TPH400 is rated at 600 bhp and features an 8″ stroke and 8.6:1 gear ratio. Both are triplex plunger pumps designed for well service applications.

Q: What fluids can the STP400 handle?

A: The STP400 is designed to pump cement slurries, sand-laden fluids, crude oil, acids, mud, and other oil well servicing fluids.

Q: What is the operating temperature range?

A: The STP400 operates reliably from -20°C to +50°C.

Q: Are SJ Petro plunger pump wear parts interchangeable with other brands?

A: Yes. SJ Petro's plunger pumps feature wear parts that are interchangeable with major international brands, ensuring easy maintenance and global parts availability.

Q: What quality testing do SJ Petro plunger pumps undergo?

A: Every SJ Petro plunger pump undergoes "million-stroke” type testing before release, validating durability and performance under real-world operating conditions.

Q: Are SJ Petro products API certified?

A: Yes. SJ Petro holds API, ISO9001, and HSE management system certifications.

Q: Do you offer OEM or customized solutions?

A: Absolutely. We offer comprehensive customization including plunger size selection, fluid end material, fluid end configuration, power system integration, skid design, and certification.

Q: What is your manufacturing capacity and lead time?

A: We produce over 5,000 plunger pumps annually with comprehensive manufacturing capabilities. Lead times vary by configuration—contact our sales team for specific project timelines.

Q: Do you provide after-sales support and spare parts?

A: Yes. We offer comprehensive after-sales support including spare parts supply, equipment inspection, testing, and major overhaul services.

Tag: Light duty truck mounted rig | Truck mounted drilling solutions | Truck mounted rig specifications | Heavy duty cementing truck