Double Stage Vacuum Pumps

Oil-sealed rotary vane pumps use a thin film of oil to create a tight seal between the rotor and stator, enabling deeper ultimate vacuum levels down to 0.5 mbar or lower. Water-ring pumps, by contrast, use a rotating liquid ring of water as the sealant and are better suited for handling wet or saturated gas streams without risk of oil contamination. The right choice depends on your process sensitivity, required vacuum depth, and tolerance for carryover.

Double-stage pumps compress the gas in two sequential rotor stages connected in series, which yields significantly deeper vacuum and better ultimate pressure than a single-stage unit of comparable size. They are ideal for applications requiring stable vacuum below 1 mbar, such as freeze drying, high-vacuum furnaces, and mass spectrometry backing. Our engineering team can review your target operating pressure and gas load to recommend the most energy-efficient configuration.

Under normal industrial operating conditions we recommend a full oil change and filter inspection every 1,500 to 2,000 running hours, or every six months, whichever comes first. For processes involving corrosive vapors or heavy particulate loads, a quarterly inspection cycle is advisable to check vane wear, shaft seals, and exhaust filter saturation. Detailed service schedules are provided in the commissioning manual shipped with every pump.

Yes, we regularly engineer fully customized vacuum skids that include inlet moisture traps, condensers, non-return valves, PLC-based control panels, and explosion-proof motor options. Our in-house design team works directly with your process engineers to map piping and instrumentation diagrams before fabrication begins. Lead times for custom builds typically range from four to eight weeks depending on the complexity of the scope.

We recommend using a high-quality mineral-based vacuum pump oil with low vapor pressure and good thermal stability, typically ISO VG 68 or VG 100 grade depending on your operating temperature range. For chemically aggressive applications we supply specially formulated inert synthetic oils that resist acid build-up and extend drain intervals. Oil should be replaced at the first sign of visible contamination, emulsion, or darkening beyond the golden amber baseline.

All our double-stage rotary vane pumps come standard with an adjustable gas ballast valve that introduces a controlled amount of dry air into the compression cycle. This feature is essential when pumping condensable vapors such as water, alcohols, or solvents because it raises the vapor partial pressure and prevents condensation inside the oil sump. Open the gas ballast fully during initial pump-down of wet systems, then close it once the process stream stabilizes to regain ultimate vacuum.

Every Tulsi double-stage vacuum pump is backed by an 18-month warranty from the date of dispatch or 12 months from the date of commissioning, whichever occurs later. The warranty covers manufacturing defects in materials and workmanship on the pump body, rotor assembly, and motor under normal operating conditions. Consumable items such as oil, filters, shaft seals, and vanes are covered for 90 days from commissioning.

Correct sizing requires three key data points: the required ultimate vacuum level in mbar or Torr, the total volume of the system to be evacuated, and the desired pump-down time to reach operating vacuum. Our application engineers use these inputs along with conductance losses from piping and valves to calculate the effective pumping speed needed at the chamber. We then select a pump model with at least 20 percent headroom above that calculated requirement to account for process variability and future expansion.

We maintain an extensive inventory of genuine spare parts covering pump models manufactured over the last 25 years, including rotor vanes, shaft sleeves, bearing kits, gasket sets, and exhaust filter elements. For legacy models that have been superseded, our service team can often retrofit modern equivalent components with minimal modification. Emergency spare part dispatches are processed within 24 hours for customers with active annual maintenance contracts.

Standard catalog models in the 5 to 25 HP range are typically available for dispatch within two to three weeks from order confirmation, subject to stock availability at our Gujarat manufacturing facility. Larger units above 30 HP or pumps requiring special metallurgy for corrosive service may require four to six weeks. We provide a firm delivery schedule at the quotation stage and offer expedited manufacturing slots for critical project deadlines.

Absolutely. Our double-stage pumps are engineered with oversized oil reservoirs, forced-air cooling fans, and thermal overload protection specifically for round-the-clock duty cycles. The cast iron construction and dynamically balanced rotor assemblies minimize vibration and wear even under sustained high-temperature operation up to 90°C ambient. Many of our units have logged over 40,000 continuous operating hours in chemical plants and pharmaceutical manufacturing lines with only routine preventive maintenance.

Yes, our field service engineers are available for on-site installation supervision, alignment checks, and full commissioning including vacuum leak-down testing and performance validation against the factory test certificate. We provide a detailed commissioning report with baseline vibration signatures, ultimate vacuum readings, and motor current draw for your maintenance records. On-site support can be bundled into the equipment purchase or arranged as a standalone service visit across all major industrial zones in India.