Sulman API610 OH1 and OH2 Petrochemical Process Pumps
1. API610 OH1 Chemical Process Pumps
API610 OH1 pumps are horizontal, single-stage, overhung centrifugal process pumps with foot-mounted casings, designed for process services in the petroleum, petrochemical, natural gas, and related industries.
2. API610 OH2 Petrochemical Process Pumps
API610 OH2 pumps are horizontal, single-stage, overhung centrifugal process pumps with centerline-mounted construction, designed for demanding process services in refineries, petrochemical plants, oil & gas facilities, and chemical plants.
3. API610 OH1 Pumps Compared with OH2 Pumps:
| Feature | API610 OH1 Pumps | API610 OH2 Pumps |
| Mounting | Foot-mounted | Centerline-mounted |
| Stage | Single-stage | Single-stage |
| Pump type | Overhung | Overhung |
| Orientation | Horizontal | Horizontal |
| Bearing housing | Yes | Yes |
| Thermal expansion | Less favorable | More favorable |
| Typical service | General process | Heavy-duty process |
| Hot hydrocarbon service | Possible | Very suitable |
API610 explicitly distinguishes OH1 as foot-mounted and OH2 as centerline-mounted.
API610 OH1 and OH2 Pumps Design Features
API610 OH1 and OH2 are both single-stage, horizontal, overhung centrifugal process pumps. The key structural difference is the casing support/mounting arrangement: OH1 is foot-mounted, while OH2 is centerline-mounted. API610 identifies OH1 as a special type requiring particular attention to pressure rating and casing support; OH2 has a dedicated bearing housing and centerline mounting arrangement.
API610 OH1 and OH2 Process Pumps Basic design comparison:
| Design Feature | API610 OH1 Pumps | API610 OH2 Pumps |
| Pump configuration | Single-stage overhung | Single-stage overhung |
| Orientation | Horizontal | Horizontal |
| Casing mounting | Foot-mounted | Centerline-mounted |
| Impeller | Overhung on shaft | Overhung on shaft |
| Bearing housing | Yes | Single bearing housing |
| Shaft support | Bearings on one side of impeller | Bearings on one side of impeller |
| Coupling | Flexible coupling | Flexible coupling |
| Baseplate | Yes | Yes |
| Thermal expansion | More limited | Better controlled |
| Typical duty | General process service | Heavy-duty process service |
| Typical industry | Chemical / refinery / process | Refinery / petrochemical / oil & gas |
Sulman API610 OH1 and OH2 Process Pumps Applications
| Industry | OH1 Pumps Applications | OH2 Pumps Applications |
| Oil & Gas | Oil transfer, hydrocarbon transfer, utility services | Hydrocarbon transfer, boosting, high-temperature process |
| Refinery | Product transfer, cooling, condensate, general process | Refinery charge, reflux, vacuum bottoms, LVGO/HVGO |
| Petrochemical | Chemical transfer, circulation, utilities | High-temperature process circulation, petrochemical feed |
| Chemical | Chemical transfer and circulation | Corrosive/hot chemical process services |
| Gas Processing | General liquid transfer | Hydrocarbon/gas-processing circulation and boosting |
| Pipeline | Transfer/booster duties | High-pressure hydrocarbon boosting |
| Marine/Offshore | Auxiliary services | Seawater booster and critical process services |
API610 OH1 vs OH2 Pumps — Application Difference
OH1: General process + transfer + utility
OH2: Heavy-duty process + high-temperature + critical refinery/petrochemical service
However, this is a selection tendency, not an absolute rule. OH1 and OH2 classifications describe the pump's mechanical configuration; they do not by themselves specify the pump's flow, pressure or temperature capability.
If a refinery needs to transfer a relatively moderate-temperature hydrocarbon:
→ OH1 may be suitable
If the refinery needs to circulate high-temperature vacuum bottoms or HVGO:
→ OH2 is typically a more appropriate configuration
This is because OH2's centerline-mounted casing is better suited to managing thermal effects in demanding services.
Sulman API610 Process Pumps Mainly Usages
| Application | Typical Service |
| Crude Oil Transfer | Transfer of crude oil between tanks and process units |
| Hydrocarbon Transfer | Pumping gasoline, diesel, kerosene and other hydrocarbons |
| Refinery Process Units | Feed, circulation and transfer duties |
| Petrochemical Plants | Process liquids and chemical feed |
| Hot Oil Circulation | Circulation of high-temperature thermal oil |
| Reflux Service | Returning condensed liquid to distillation columns |
| Boiler Feed & Condensate | High-pressure water and condensate transfer |
| Cooling Water | Cooling-water circulation and boosting |
| Gas Processing | Hydrocarbon and process-liquid circulation |
| Vacuum Service | Vacuum bottoms and other refinery process fluids |
| Fractionation | Bottoms and product transfer from fractionation units |
| Seawater Service | Seawater intake, circulation and booster duties |
| Chemical Transfer | Corrosive or hazardous process liquids |
| Pipeline Boosting | Increasing pressure in oil and refined-product pipelines |
Sulman API610 Process Pumps Main Types
1. Overhung Pumps
OH1 and OH2 are particularly important for refinery and petrochemical process applications.
2. Between-Bearings Pumps
| Type | Construction | Typical Application |
| BB1 | Axially split, 1–2 stage | High-flow process service |
| BB2 | Radially split, 1–2 stage | Refinery/process service |
| BB3 | Axially split, multistage | High-head applications |
| BB4 | Radially split, multistage | High-pressure service |
| BB5 | Double-casing, radially split, multistage | Very high-pressure service |
3. Vertically Suspended Pumps
Why Choose Sulman API610 OH1 and OH2 Process Pumps?
API610 OH1 and OH2 pumps are widely selected for oil & gas, refinery, petrochemical, chemical, and other critical process applications because they provide high reliability, robust construction, and long service life.
1. High Reliability
API610 pumps are designed for continuous and demanding operation, helping reduce unexpected shutdowns and maintenance costs.
2. Heavy-Duty Construction
OH1 and OH2 pumps feature robust components such as heavy-duty shafts, bearings, bearing housings, and pump casings, making them suitable for severe industrial services.
3. Excellent Thermal Performance
OH2 centerline-mounted pumps are particularly suitable for high-temperature applications because the centerline mounting helps minimize thermal distortion and maintain shaft alignment.
4. High Mechanical Stability
The robust shaft and bearing arrangement helps reduce: Shaft deflection, Vibration, Bearing loads, Mechanical seal wear, Alignment problems
5. Suitable for Critical Process Services
Crude oil transfer
Refined product transfer
Hydrocarbon circulation
Cooling and utility services
Boiler feed and condensate services
Petrochemical processes
Gas processing
Refinery process units
Hot oil circulation
Chemical transfer
6. Long Service Life
High-quality materials and conservative engineering design help extend the operating life of critical pump components such as impellers, shafts, bearings, wear rings, and mechanical seals.
7. Easier Maintenance
The single-stage overhung design provides relatively straightforward access to major components, making inspection, maintenance, and spare-parts replacement easier.
8. API610 Industry Standard
API610 compliance provides a recognized engineering framework for pump design, materials, mechanical performance, testing, and reliability, which is particularly important for critical oil & gas and petrochemical installations.
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