OH4
API 610 Vertical Heavy-Duty Solutions
Eureka’s OH4 Process Pumps are vertical in-line, single-stage, single-suction pumps designed for continuous-duty service in offshore, refinery, and industrial environments. Fully compliant with API 610 standards, these compact and robust pumps are ideal for handling seawater, crude oil, and process fluids across a wide range of temperatures and pressures.
With over 1500 units delivered over four decades, Eureka’s OH4 pumps are a proven solution for space-constrained and safety-critical installations. Available in Super Duplex, Duplex, AISI 316 Stainless Steel, and Carbon Steel, they are optimized for use in aggressive offshore environments.
All units are designed in accordance with API 610 and NORSOK requirements, comply with the EU Machinery Directive 2006/42/EC, and can be ATEX and IECEx certified for use in hazardous environments.
Main Features & Benefits
- API 610-compliant design for process and offshore reliability
- Compact vertical in-line configuration for small footprint
- Continuous duty for oil & gas, refinery, and chemical service
- Multiple material options: 25% Cr Super Duplex, 22% Cr Duplex, AISI 316, Carbon Steel
- Impeller designed for low NPSH requirements
- Top-down rotor access for easy removal without disturbing piping
- Supports single and dual mechanical seals for application flexibility
- Compatible with dry or wet motor configurations
- Optional variable speed drive and condition monitoring
Description
The OH4 is a radially split vertical in-line pump with integrally cast suction and discharge nozzles. The electric motor is pedestal-mounted directly onto the pump cover, creating a compact and maintenance-friendly layout.
The pump is optimized for reliability and performance in hazardous environments, with features like pressurized seal chambers, balanced impellers, and optional instrumentation for remote monitoring.
Key Functional Design:
- Vertical in-line configuration for space-saving installation
- API 610-compliant casing and hydraulic design
- No internal pump bearings – rotor is supported by motor bearings
- Maintenance-friendly design allows rotor removal as a single unit
Pump Casing & Cover
- Radially split design for pressure containment and ease of service
- Cast-in nozzles for structural strength
- Pump cover with integrated seal chamber, supporting motor pedestal
Flanges & Connections
- ANSI B16.5 300 lbs RF flanges (standard)
- Custom flange ratings available upon request
Shaft, Sleeve, & Coupling
- Keyed shaft sleeve to prevent rotation
- Rigid coupling for stable torque transfer
Impeller & Wear Rings
- Optimized impeller eye for reduced NPSH requirements
- Impeller with wear rings on both sides are installed with interference fit and mechanically
secured
Bearings & Rotor Support
- No internal bearings in pump body
- The rotor is fully supported by motor bearings, simplifying maintenance
Electric Motor
- Mounted on pedestal directly to the pump cover
- Available in dry or wet configurations
- Designed for continuous duty in harsh environments
