What Is API 610?
API 610 is the internationally recognized standard for centrifugal pumps used in petroleum, petrochemical and natural gas industries. It establishes stringent requirements for design, manufacturing, testing and reliability, ensuring safe and continuous operation in demanding services.
The standard is specifically intended for demanding applications involving high pressure, high temperature, and hazardous, flammable, or corrosive fluids, where reliability and operational safety are essential.
Meeting API 610 requirements is critical for pump manufacturers serving the oil and gas industry.
YOUNAI manufactures a complete range of API 610 compliant pumps, including OH, BB, and VS series configurations, providing dependable pumping solutions for refinery, petrochemical, and natural gas processing facilities worldwide.
API 610 Pumps: Overhung Process Series
Engineered to API 610 standards for maximum reliability, our overhung process pumps handle corrosive, abrasive, high-temperature, and low-temperature fluids – delivering excellent performance across the industry’s most challenging pumping applications.
Capacity: 3～2600m3/h
Total head: 3～300m
Suitable for general process duties
Capacity: 2～400m3/h
Total head: 20～200m
Max.operating pressure 10.0MPa
Operation temperature: -80～450℃/ -112～842°F
Max. pressure: 10.0MPa
Conform to API610/API682 standard
Capacity: 2.5～350m3/h
Total head: 100～350m
Solid content is below 20g/l
API 610 Pumps: Vertical Suspended Series
Designed for wet pit applications and fully compliant with the latest API 610 standards, our vertical suspended pumps handle demanding petrochemical media with ease, offering proven durability and reliability. This delivers: reduced maintenance, extended continuous operation time, and a lower total cost.
Vertically Suspended PumpCapacity: 5～1000m3/h
Total head: 10～150m
Operation temperature: -40～400℃/ -40～752°F
VS4 PumpCapacity: 0.3～2400m3/h
Total head: 5～230m
Operation temperature: -40～400℃/ -40～752°F
VS6 PUMPCapacity: 10～500m3/h
Total head: 10～80m
Operation temperature: 0～180℃/ 32 ~ 356°F
API610 Pump Materials
Wetted parts materials are selected based on fluid properties, operating temperature, pressure, and corrosion requirements, in accordance with API 610 material classes.
- Carbon Steel · Chrome Steel · Martensitic Stainless Cast Steel — general and high-temperature hydrocarbon service;
- SS 304 · SS 316/316L · Duplex 2205 · Super Duplex 2507 — corrosive and H2S service;
- Hastelloy B · Hastelloy C — aggressive chemical and acid service;
- Titanium · Titanium Alloys — highly corrosive and chloride-rich service;
- High-Chrome White Cast Iron — abrasive and particle-laden service.
Applications
- Crude oil transfer (high-temperature service)
- Atmospheric distillation units
- Vacuum distillation units
- Hydroprocessingfeed systems
- Ethylene (cryogenic service)
- Olefins
- Polymer transfer systems
- Heat transfer fluids (high-temperature service)
- LNG transfer
- Cryogenic methanol wash systems
- Light hydrocarbon transfer(ethane/propane/butane)
API 610 Pumps: Between Bearings Series
The highly efficient between-bearing pumps are used for multiple applications in the petroleum, petrochemical, and natural gas industries. YOUNAI provides a wide range of options and configurations specifically designed for severe services, including high flows, high pressure, high temperature, low temperature, and corrosive or abrasive media.
Circulation pump, condenser water pump
High-flow, medium pressure. Multiple sizes available. High efficiency, reliable, and stable operation. Design life >20 years (wear parts excluded ). Continuous operation >3 years ( excluding damage from operational error, overload, or inadequate maintenance).
High-pressure boiler feed, hydrocracker/hydrotreater charge, ethylene service.
Double-case, radially split, single stage or two stages design. For high-pressure, safe, leak-proof performance in steam systems of refineries, petrochemical, and thermal power plants.
High-pressure boiler feed, crude oil pipeline, Supercritical liquefied petroleum gas, ethylene, high-pressure refinery services.
Available in 4-14 stages. Axially split, back-to-back impellers for thrust balance. Heavy-duty design, double volute casings, low NPSH. For demanding high-flow, high pressure, and high-temperature applications.
Feed water pump, petrochemical industry, high-pressure services.
Radially split, multistage pump with single casing ( ring-section/segmented design). Compact construction, high head, small footprint, light weight. Optimized radial diffusers for higher efficiency and lower energy consumption. High adaptability, wide range of sizes and specifications.
High pressure or ultra-high pressure services, refining, petrochemical, gas processing, crude oil transportation, atmospheric and vacuum pressure unit
Diffuser-type barrel pump, horizontal, radially split, multistage. Centerline support for strong thermal stability and higher nozzle load capability. Various impeller and diffuser arrangements available, enabling customized optimal efficiency and performance.
Why Choose YOUNAI for API 610 Pumps?
YOUNAI engineers and manufactures centrifugal pumps to the full requirements of API 610 — tailored to your exact process conditions, and built to perform reliably in the most demanding services.
- Centerline-mounted design for thermal stability;
- Heavy-duty shaft for extended service life;
- Seal chamber designed in accordance with API682;
- Proven reliability in process applications;
- Meets procurement specifications for critical pumping equipment across oil & gas, chemical, coal chemical, and thermal power generation.
- High-pressure BB3 between-bearings design;
- Axially split, double volute casing for low NPSH and reduced radial loads;
- 4–14 stage configuration for high-flow, high-pressure continuous service;
- Forged steel, chrome-steel, and corrosion-resistant materials available;
- Customized solutions to your process conditions and project specifications.
The API610 standard specifies requirements for critical pumps used in key applications such as petroleum, natural gas, petrochemical, coal chemical, and thermal power plants. It covers pump performance, service life, installation and maintenance requirements, safety, leakage rates, etc. The ANSI standard primarily focuses on dimensional standardization to facilitate product interchangeability and maintenance. API610 is for critical, severe-duty; ANSI is for general, less demanding applications.
YOUNAI provides a wide range of material options as per API610, including carbon steel, stainless steel, duplex stainless steel, super duplex stainless steel, titanium, titanium alloy, nickel, Hastelloy B/C, etc. Our sale and engineers’ team will recommend the most cost-effective material for your specific fluid properties and operating conditions.
YOUNAI engineers products to your exact specifications, including:
Special hydraulic performance (flow & head).
Specific or high-grade materials for wetted parts.
Custom seal flush plans for severe services (handling corrosive, abrasive, or polymerizing media).
Designs for extreme temperatures, with options like jacketed casings or cooling systems.
Modifications to meet unique installation or connection requirements.
Optional configuration: control cabinet, auto alarm system, diesel engine, trailer.
API 610 Pump for Petrochemical Applications: Engineering Features and Field Performance
OH2 Centerline-Mounted Pumps Supplied for a Refinery Upgrade Project
- API 610 Pump Standard and Industrial Applications
API 610 establishes internationally recognized requirements for centrifugal pumps used in petroleum, petrochemical, and natural gas industries, focusing on reliability, vibration control, long service life, and maintainability. It is widely applied in refinery and petrochemical processes involving critical and continuous-duty services. Typical applications include refinery units, petrochemical plants, and other high-demand process industries.
- Refinery Upgrade Project Background
A refinery modernization and upgrading project in Central Asia, with an annual crude oil processing capacity of approximately 7.5 million tonnes, involved a large-scale expansion of process units aimed at improving fuel quality to meet Euro IV standards.
The sulfur recovery project included systems associated with:
- Sulfur Recovery Unit (SRU)
- Sour Water Stripper (SWS)
- Amine Regeneration Unit (ARU)
These units handle H₂S-containing gas, ammonia-rich sour water, and corrosive process streams, creating demanding conditions for rotating equipment.
- Selection of API 610 OH2 Pumps for Critical Service
For these critical services, API 610 OH2 centerline-mounted pumps were selected due to their superior thermal stability, mechanical robustness, and suitability for continuous operation in refinery environments. Key advantages include improved shaft stability, reduced vibration levels, and high nozzle load tolerance, making them suitable for demanding process conditions.
- API 682 Plan 53A Sealing System
The pumps were equipped with API 682 Plan 53A pressurized barrier fluid systems for sour water and H₂S-containing services. Barrier fluid pressure is maintained above seal chamber pressure to ensure process containment and environmental safety. This configuration improves seal reliability, reduces leakage risk, and supports long-term stable operation in hazardous process environments.
- Engineering Design Features of API 610 OH2 Pumps
The pumps incorporate heavy-duty engineering features designed for refinery service. The bearing housing is constructed from cast steel and designed for high rigidity. Oil-cooled lubrication ensures uniform heat dissipation and improves bearing life. Rotor dynamics are designed in accordance with API 610 requirements, ensuring adequate critical speed margins for stable operation and low vibration.
The casing is designed to withstand high nozzle loads, with the pump capable of handling loads up to approximately 2–3 times the API 610 11th Edition allowable values, ensuring reliability under real piping stress conditions. In addition, the pump structure is engineered for extreme mechanical robustness, with casing strength capable of withstanding up to three times the API 610 specified limits.
For drainage and maintenance optimization, a low-point drain is provided at the suction-side inlet, and the nozzle extension length is limited to a maximum of 150 mm to improve drainage efficiency and maintenance accessibility.
Maintenance-friendly features such as low-point drainage and high-point venting simplify startup and shutdown operations.
- Factory Acceptance Testing (FAT)
Before shipment, the pumps were subjected to factory acceptance testing witnessed by the end user. The testing program included:
- Hydraulic performance testing
- Vibration measurement
- Noise testing
- Mechanical inspection
All contractual requirements were successfully achieved before equipment delivery. Customer participation in the testing process provided additional confidence that the pumps would perform as expected in refinery service.
- Field Performance in Refinery Operation
Following installation and commissioning, the pumps have been operating in the refinery’s sulfur recovery and sour water systems under continuous service conditions. They continue to meet operational requirements for vibration control, noise levels, hydraulic performance, and overall stability. The pumps have remained in reliable service since commissioning, with approximately nine years of field operation recorded as a service reference. Long-term operation confirms the suitability of API 610 OH2 design for refinery critical service applications.
- Why API 610 Pumps Are Preferred in Refineries
Refinery operators around the world continue to specify API 610 pumps because they provide:
- Proven reliability in critical process services
- Long equipment life
- Superior rotor dynamic performance
- Improved maintainability
- Enhanced safety when combined with API 682 sealing systems
- Reduced risk of unplanned shutdowns
- Engineering Support and Contact
YOUNAI provides engineered API 610 centrifugal pump solutions for refinery and petrochemical applications, including sulfur recovery, sour water treatment, hydroprocessing, and general process services.
All three types are designed for medium-flow, high-pressure services, but each services a distinct purpose. The BB5 is built for the most extreme pressures (e.g., in crude/vacuum distillation) and offers the greatest robustness and safety integrity. The BB4 is the most compact and cost-effective option, making it the most common choice for high-pressure applications like boiler feed water. The BB3 covers a wide range of duties, including lean methanol service, delivering very high pressure with the advantage of convenient maintenance. Not sure which one you need? Share your parameters with us, and we’ll recommend the right fit quickly.
Thanks for asking. Our standard API610 pumps typically ship in 4-6 weeks. We maintain a well-stocked semi-finished warehouse, which helps reduce delivery time. For pumps requiring special materials or customized, non-standard components, delivery time will be longer. Once your order is confirmed, we provide a firm schedule and keep you proactively updated until delivery.
In line with industry practice, we offer an 18-month standard warranty from equipment commissioning, or within two years after departure. For issues outside the warranty scope, we remain committed to proactive communication and will assist you in finding a resolution.
