Oak Services Company's history dates back to 1970 when it's founder, Dennis Pataki, started working for The Nash Engineering Company as a service technician. The next 7 years he gained experience servicing and repairing virtually all of Nash's products including vacuum pumps and compressors for industrial applications like nuclear and fossil power plants, hospital and laboratory installations, food and chemical processing, municipal water and sewage treatment, paper and steel mills and other applications.
Services
Installation, Operation and Maintenance manuals. Seal, packing, and gasket kits for pumps and motor units. Receiver accessories; valves, switches, gauges, strainers. Re-manufactured exchange pump and motor assemblies. Modern pump and motor conversion kits to fit old receivers. Complete new Type CLS vacuum condensate return and boiler feed units using Nash's unique proven design concepts.
The Nash Engineering Company also made many larger or custom designed vacuum and condensate return units that are not shown here. When inquiring about these special units, please provide us with the unit's SIZE NUMBER and TEST NUMBER. This information is found on the unit's brass nameplate. It is also very helpful to send us pictures of the equipment.
Type CLS Vacuum Heating Pumps employ positive displacement liquid ring vacuum pumps. In terms of CFM per horsepower, they are much more efficient than the water jet type vacuum producer found in other brands of vacuum heating pumps. Type CLS vacuum pumps are sealed with a gravity flow of recirculated condensate.
The drawing above shows the factory set-up to test a Nash Jennings Type CSM Vacuum Heating Pump. Capacity testing in the field does not need to be so elaborate, but the basic principles used in the factory test procedure can still be applied. The standard receiving tank sizing is based on the steam condensing rate of the system and provides a one minute condensate storage capacity.
The main reasons for having vacuum pumps on low pressure steam condensate return lines are AIR REMOVAL and PRESSURE REDUCTION. During mild weather when the boiler is on only part-time, the vacuum pump's main job is to mechanically remove air from the system so we don't have to use steam pressure to push air out.
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