![](https://www.sundyne.com/wp-content/uploads/ND_2100x1610.jpg)
API-610 OH1 and ISO 13709 compliant for General Refinery Services centrifugal, single-stage, self-venting centrifugal process pump
The model ND is a single-stage, self venting centrifugal process pump for chemical, industrial, and petrochemical general services.
- Flows to 1,761 gpm (400 m³/hr)
- Heads to 492 ft (150 m)
- Temperature Range -58 to 482°F (-50 to 250°C)
Precision engineered API/ISO 13709 process pumps meeting rigorous engineering requirements for heavy duty applications while receding the total life cycle cost and improving mean time between repairs.
APPLICATIONS
Refineries
- Hydrocracking
- Topping
- Gas condensate
- HDS
- Merox LPG
- Amine
- Sour water
- Coking
- Platforming
Petrochemical
Crude oil and gas pipelines
Offshore and onshore oil and gas
Reverse osmosis
Synfuels
Proven to be reliable, efficient and long-lasting, Marelli OH1 pumps provide a number of operational benefits for process engineers and plant operators:
- API 610 11th Edition/ISO 13709 full compliance for reliability and accountability
- Suitable with 60 Hz and 50 kW motors
- Higher efficiencies due to a design with tangential discharge and a wide variety of hydraulics to match exact duty points
- Centerline mounted pump casing maintains alignment during operation and elevated temperatures
- Low suction specific speed and low NPSH characteristics with a wide choice of impellers for optimum efficiency over a large operating range
- Finned bearing housing to provide maximum heat dissipation under API 610 compliance
- Isolation chamber at bearing housing with a thermal barrier among mechanical seal chamber and bearing housing
- Deflection system with fins to improve cooling
- Labyrinth bearing seals to avoid external contamination and maximize seal and lubrication life
- Highly maintainable and replaceable wear rings to reduce overall life cycle costs
- Socket welded flanged drains and vents as standard (gussets and bracing also available)
- Choice of multiple impellers in each hydraulic pump casing for optimum efficiency over a wide operating range
- A variety of instrumentation options are available for monitoring all key operating perimeters (temperature, pressure, vibrations and more)
![](https://www.sundyne.com/wp-content/uploads/Marelli-OH2-Skid-300x231.jpg)
US 60 Hz
- Heads to 754 ft
- Flows to 5,283 gpm
- Standards API 610 OH1
- Maximum Motor Power 215 HP
- Temperature Range -58 to 482°F
- Maximum Case Working Pressure 232 psi
- Maximum Suction Pressure 145 psi
- Differential Head 492 ft
- Maximum Viscosity Consult Factory
- Mounting Configuration Horizontal-end top
- Seal Configurations Packing with optional mechanical seals
- Available Flanges PN17/FF
- Suction and Discharge Sizes Up to DN 200 / ND 150
Metric 50 Hz
- Heads to 161 m
- Flows to 960 m3/hr
- Standards ISO 13709
- Maximum Motor Power 160 kW
- Temperature Range -50 to 250°C
- Maximum Case Working Pressure 16 bar
- Maximum Suction Pressure 10 bar
- Differential Head 150 m
- Maximum Viscosity Consult factory
- Mounting Configuration Horizontal-end top
- Seal Configurations Packing with optional mechanical seals
- Available Flanges PN16/FF
- Suction and Discharge Sizes up to DN 200 / ND 150
Part | S1 | S5 | S6 | S8 | C6 | A8 | D1 |
Pressure Casing | Carbon Steel (A216 WCB) | 12% CHR | 316 AUS | Duplex | |||
Impeller | Cast Iron | Carbon Steel | 12% CHR | 316 AUS | 12% CHR | 316 AUS | Duplex |
Wear Rings | Cast Iron | 12% CHR Hardened | Hard-faced 316 AUS | 12% CHR Hardened | Hard-faced 316 AUS | Hard-faced Duplex | |
Shaft | Carbon Steel | AISI 4140 | 316 AUS | 12% CHR | 316 AUS | Duplex | |
Bearing Housing | Carbon Steel (A216 WCB) | ||||||
Base Gasket | AUS, Spiral Wound | 316 AUS Spiral Wound | AUS, Spiral Wound | 316 AUS, Spiral Wound | Duplex SS Spiral Wound |
Customized High Temperature Features
Cooled mechanical seal chamber
External cooling for bearing housing with finned heat exchanger fed with inert fluid and/or water
Convection venting for bearing housing with a low noise fan placed at the rear in the coupling side
![](https://www.sundyne.com/wp-content/uploads/Marelli-OH2-Coled-Mech-Seal-Chamber-222x300.png)
![](https://www.sundyne.com/wp-content/uploads/Marelli-OH2-External-Cooling-Feature-300x182.png)
![](https://www.sundyne.com/wp-content/uploads/Marelli-OH2-convection-VEnting-300x182.png)
High Suction Pressure Options
Heavy duty bearing housings
Mechanical seals to meet safety and environmental requirements
Pump casing and seal chamber
Engineered bearings
![](https://www.sundyne.com/wp-content/uploads/Marelli-OH2-High-Suction-Pressure-300x285.png)
Lubrication System
- Purge ports with drain valve
- Test gauges for condition analysis
- Oil mist lubrication system with purge ports
- Outboard oil mist system for assuring flow through each bearing
For Coking Services
- Backwash system for wear rings and neck bushing
- Specific coke crusher available
![](https://www.sundyne.com/wp-content/uploads/Marelli-OH2-Coking-235x300.png)
Baseplate Designs
- Pre-grouted and non-grouted for all driver types
- Special base designs to match oversize drivers, pump and turbines
- Tailor made baseplates available
- Skid mounting and oil field designs avaialable