Centerline Mounted Centrifugal Pump (API 610 OH2)

Model: CHD

The API 610 OH2 Model CHD Pump is a horizontal, single-stage, overhung centrifugal pump designed in full compliance with API 610 standards for oil & gas, refinery, and petrochemical services. It features a centerline-mounted casing, optimized hydraulics, and heavy-duty construction for high thermal stability, reliable performance, and continuous operation.

API 610 OH2 Pump

Introduction

The CENTFOS-CHD API 610 OH2 pump is a horizontal, overhung, centerline-mounted, single-stage centrifugal pump designed fully in compliance with the latest edition of API 610 for refinery, petrochemical, and oil & gas applications.

The OH2 configuration is the most widely used API process pump type, engineered for high reliability, thermal stability, and heavy-duty service, particularly in high-temperature hydrocarbon and chemical applications.

The CENTFOS OH2 series combines optimized hydraulic performance, rugged mechanical design, and API-compliant construction to deliver continuous, safe, and efficient operation in critical process environments.

Key Features
  • Designed in full compliance with API 610 (OH2 type)
  • Centerline-mounted casing to handle thermal expansion
  • Radially split casing
  • Single-stage, overhung impeller
  • Back pull-out design for simplified maintenance
  • Heavy-duty shaft with low deflection (API limits)
  • Closed impeller with optimized vane profile
  • API 682 compliant seal chamber
  • Replaceable casing and impeller wear rings
  • Oil-lubricated bearing housing
  • Designed for continuous 24/7 operation
  • Suitable for VFD operation
Technical Specifications
Parameter Range
Flow Rate Up to 2,000 m³/hr
Head Up to 300 m
Design Pressure Up to 50 bar (higher on request)
Temperature Range -46°C to +400°C
Speed 1,450 / 2,950 rpm (50 Hz)
Nozzle Orientation End suction, top discharge
Flange Rating ASME B16.5 Class 150–600
Seal Type Single / Dual Mechanical Seal
Seal Plans API Plan 11 / 52 / 53 / 54
Mounting API baseplate, centerline supported
Design Characteristics
Hydraulic Design
  • High-efficiency closed impeller
  • Optimized volute for stable flow characteristics
  • Low NPSHr design
  • Balanced hydraulic thrust
Mechanical Design
  • Centerline mounting prevents misalignment due to thermal growth
  • Shaft designed to API deflection criteria (≤0.05 mm at seal)
  • Heavy-duty bearing housing
  • Long L10 bearing life (≥25,000 hours)
  • Cartridge mechanical seal compatible
Seal Chamber
  • Large bore seal chamber
  • API 682 compliant
  • Suitable for hazardous and high-temperature services
  • Designed for dual seal and pressurized seal systems
Maintenance-Friendly
  • Back pull-out design allows removal of rotating assembly without disturbing casing or piping
  • Quick access to bearings and seal
Construction & Materials
Component Standard Material
Casing ASTM A216 WCB
Impeller CF8M / SS316
Shaft AISI 4140 / 410 SS
Wear Rings SS / Hardened Alloy
Shaft Sleeve SS 410 / 316
Bearings SKF / FAG / Equivalent
Baseplate Fabricated Steel, API Type
Optional materials:
  • Duplex Stainless Steel
  • Super Duplex
  • Alloy 20
  • Monel
  • Hastelloy
  • Special corrosion-resistant alloys
Applications
The CENTFOS OH2 pump is ideal for:
  • Refinery process units
  • Crude oil transfer
  • Hydrocarbon service
  • Condensate service
  • Naphtha, diesel, gasoline transfer
  • Chemical processing
  • LPG/LNG auxiliary systems
  • High-temperature oil services
  • Boiler feed (low to medium pressure)
Advantages
  • Handles high-temperature applications effectively
  • Superior alignment stability due to centerline mounting
  • API 610 compliant for critical services
  • Long operating life with minimal downtime
  • Flexible sealing and material options
  • Suitable for hazardous area installations
Why Choose CENTFOS-CEE OH2?
  • Engineered to international API standards
  • Proven reliability in oil & gas applications
  • Optimized hydraulic performance
  • Heavy-duty mechanical design
  • Custom-built to process requirements
  • Global support and technical expertise