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DOLPHIN

Liquid ring vacuum pumps and compressors

dolphin_lt_0170_a

DOLPHIN are the robust liquid ring vacuum pumps and compressors from Busch. This series encompasses decades of experience in the use and further development of liquid ring technology.

Their proven operating principle provides virtually isothermal (cold) compression which is especially useful for sensitive or hazardous gases.

They are the perfect solution for demanding applications. For example, the evacuation of saturated gases and vapors.

The DOLPHIN series comprises a large variety of sizes and assemblies: single- or two-stage, with a directly flange-mounted motor, or assembled on a base plate, vacuum pumps and compressors.

Operating principle

DOLPHIN are single- or two-stage liquid ring vacuum pumps and compressors.

An eccentrically mounted impeller rotates in a housing partially filled with operating fluid. The impeller blades dip into the fluid, and the centrifugal force exerted by their rotation forms a so-called liquid ring within the housing.

The pumped medium is transported in the spaces between the blades and the liquid ring. The eccentric rotation of the impeller alters the volume of these spaces. Thereby, the gas is drawn in, compressed and expelled.

In the single-stage versions, compression is carried out once. In the two-stage versions, the pumped medium is compressed again to allow higher vacuum levels to be achieved. Operation as a compressor is possible.

Discover our DOLPHIN series

  • dolphin_la_0143_a_1
    DOLPHIN LA/LB

    Reliable vacuum for a variety of chemical processes

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  • dolphin_lg_0890_a_1
    DOLPHIN LG/LR

    Our largest liquid ring vacuum pumps

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  • dolphin_lm_0100_a
    DOLPHIN LM/LT

    Robust principle, modern design

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  • dolphin_ln_3002_a
    DOLPHIN LN

    The perfect solution for flare gas recovery

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  • dolphin_lx_0110_c
    DOLPHIN LX

    The compact solution for challenging environments

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  • dolphin_vl_0170_a_continuousflow
    DOLPHIN VL

    The complete solution

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DOLPHIN LA/LB

dolphin_la_0143_a_1
Reliable vacuum for a variety of chemical processes

  • Extremely high vapor and particle tolerance
  • For harsh process conditions
  • Various sizes and versions
  • Different operating fluids possible

Benefits of the DOLPHIN LA/LB series

DOLPHIN LA/LB is our series of robust and reliable liquid ring vacuum pumps in base plate design. Their proven operating principle allows them to be used in many sectors of industry.

Even demanding applications, such as evacuating saturated gases and vapors are possible without problems. Different operating fluids may be used according to process conditions.

Thanks to the modular design, various assemblies are possible. The precisely dimensioned range of sizes, a wide variety of shaft sealing options, choice of accessories and construction materials allows you to find the perfect DOLPHIN LA/LB for your process.

DOLPHIN LA are single-stage vacuum pumps whereas DOLPHIN LB have two stages for a higher vacuum.

All DOLPHIN LA/LB products

  • DOLPHIN LA 0053–0143 A
    DOLPHIN LA 0053–0143 A

    Ultimate pressure:
    100 TORR
    Nominal pumping speed:
    min. 34.0 ACFM max. 111.0 ACFM

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  • DOLPHIN LA 0224–0475 A
    DOLPHIN LA 0224–0475 A

    Ultimate pressure:
    100 TORR
    Nominal pumping speed:
    min. 160.0 ACFM max. 335.0 ACFM

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  • DOLPHIN LA 0756/0906 A
    DOLPHIN LA 0756/0906 A

    Ultimate pressure:
    100 TORR
    Nominal pumping speed:
    min. 497.0 ACFM max. 686.0 ACFM

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  • DOLPHIN LA 1157–1807 A
    DOLPHIN LA 1157–1807 A

    Ultimate pressure:
    100 TORR
    Nominal pumping speed:
    min. 817.0 ACFM max. 624 – 1207 ACFM

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  • DOLPHIN LA 1908–2808 A
    DOLPHIN LA 1908–2808 A

    Ultimate pressure:
    100 TORR
    Nominal pumping speed:
    min. 1333.0 ACFM max. 1866.0 ACFM

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  • DOLPHIN LA 3809/5109 A
    DOLPHIN LA 3809/5109 A

    Ultimate pressure:
    100 TORR
    Nominal pumping speed:
    min. 2304.0 ACFM max. 3096.0 ACFM

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  • DOLPHIN LB 0063–0184 A
    DOLPHIN LB 0063–0184 A

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 39.0 ACFM max. 132.0 ACFM

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  • DOLPHIN LB 0265–0425 A
    DOLPHIN LB 0265–0425 A

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 193.0 ACFM max. 295.0 ACFM

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  • DOLPHIN LB 0526/0726 A
    DOLPHIN LB 0526/0726 A

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 341.0 ACFM max. 453.0 ACFM

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  • DOLPHIN LB 0857–1757 A
    DOLPHIN LB 0857–1757 A

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 586.0 ACFM max. 1177.0 ACFM

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  • DOLPHIN LB 2108–3108 A
    DOLPHIN LB 2108–3108 A

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 1368.0 ACFM max. 2063.0 ACFM

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  • DOLPHIN LB 3809/4409 A
    DOLPHIN LB 3809/4409 A

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 2225.0 ACFM max. 2813.0 ACFM

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DOLPHIN LG/LR

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Our largest liquid ring vacuum pumps

  • Extremely high vapor and particle tolerance
  • For harsh process conditions
  • Various sizes and versions
  • Different operating fluids possible

Benefits of the DOLPHIN LG/LR series

DOLPHIN LG/LR is a series of high-capacity liquid ring vacuum pumps. They can be used in many industrial sectors, even for demanding applications. For example, the discharge of particle-laden gases or highly saturated vapors.

Their modular base plate design allows these vacuum pumps to be perfectly adapted to many different industrial processes.

Various assemblies and construction materials are possible, including cast iron (EN-GJL-200) and 316 grade stainless steel.

A wide variety of operating fluids can be used to perfectly match all process requirements.

All DOLPHIN LG/LR products

  • DOLPHIN LG 0890/1200 A
    DOLPHIN LG 0890/1200 A

    Ultimate pressure:
    120 TORR
    Nominal pumping speed:
    min. 5237.0 ACFM max. 7062.0 ACFM

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  • DOLPHIN LG 1910/2680 A
    DOLPHIN LG 1910/2680 A

    Ultimate pressure:
    120 TORR
    Nominal pumping speed:
    min. 11240.4 ACFM max. 15771.8 ACFM

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  • DOLPHIN LR 0700/1190 A
    DOLPHIN LR 0700/1190 A

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 4119.5 ACFM max. 7003.2 ACFM

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  • DOLPHIN LR 1560/2200 A
    DOLPHIN LR 1560/2200 A

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 9180.6 ACFM max. 12947.0 ACFM

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DOLPHIN LM/LT

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Robust principle, modern design

  • Extremely high vapor and particle tolerance
  • For harsh process conditions
  • Universal flanges
  • Various sizes and versions
  • Easy servicing

Video: How DOLPHIN LM/LT vacuum pumps work

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Benefits of the DOLPHIN LM/LT series

The DOLPHIN LM/LT series is the latest generation of liquid ring vacuum pumps from Busch. It combines all the advantages of proven technology with additional refinements.

Even demanding applications such as evacuating saturated gases and vapors are possible without problems. Their operating fluid is usually water, but other liquids may be used if required by the process conditions.

Their new sealing concept with optimized Viton or FFKM seals makes them suitable for most applications.

Universal flanges allow for simple fitting or replacement of existing vacuum pumps. The precisely dimensioned range of sizes and the choice of accessories and construction materials allows you to find the perfect DOLPHIN LM/LT for your process.

DOLPHIN LM are single-stage vacuum pumps whereas DOLPHIN LT have two stages for a higher vacuum. More than ten sizes allow an exact match to every process.

All DOLPHIN LM/LT products

  • DOLPHIN LM 0100–0270 A
    DOLPHIN LM 0100–0270 A

    Ultimate pressure:
    100 TORR
    Nominal pumping speed:
    min. 58.0 ACFM max. 157.0 ACFM

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  • DOLPHIN LM 0530/0800 A
    DOLPHIN LM 0530/0800 A

    Ultimate pressure:
    100 TORR
    Nominal pumping speed:
    min. 327.0 ACFM max. 510.0 ACFM

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  • DOLPHIN LT 0130–0220 A
    DOLPHIN LT 0130–0220 A

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 75.0 ACFM max. 137.0 ACFM

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  • DOLPHIN LT 0320–0510 A
    DOLPHIN LT 0320–0510 A

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 188.0 ACFM max. 300.0 ACFM

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  • DOLPHIN LT 0630/0750 A
    DOLPHIN LT 0630/0750 A

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 340.0 ACFM max. 418.0 ACFM

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DOLPHIN LN

dolphin_ln_3002_a
The perfect solution for flare gas recovery

  • API-681 standard
  • ATEX-certified
  • Minimum thermal expansion
  • Modular design
  • Easy cleaning with hot steam
  • Test run without operating fluids possible
  • Easy start function

Benefits of the DOLPHIN LN series

DOLPHIN LN liquid ring compressors have been specially designed for all demanding overpressure applications in the oil and gas industry. They are perfectly suited for flare gas recovery and off-gas or chlorine gas compression.

Of course, they comply with the API-681 standard and are ATEX-certified.

Their oval-shaped housing, together with operating liquid management via cylindrical type distributor, ensures reliable operation. Being not sensitive to thermal expansion, there is no risk of rotor seizing. Even an unlikely axial shift of the impeller is tolerated.

The modular two-stage design allows for quick replacement of bearings and mechanical seals. No clearance readjustment is necessary at reassembly.

DOLPHIN LN can be cleaned very easily. You just use hot steam while the impeller rotates in the empty compression chamber.

With the innovative easy start function, you can simply turn on the compressor under full discharge pressure. It then builds up performance within ten seconds. There is no need for special shut-down or starting procedure.

All DOLPHIN LN products

  • DOLPHIN LN 3001/3002 A (Former NSB SB 1.25/2.25)
    DOLPHIN LN 3001/3002 A (Former NSB SB 1.25/2.25)

    Ultimate pressure:

    Nominal pumping speed:

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DOLPHIN LX

dolphin_lx_0110_c
The compact solution for challenging environments

  • Compact monobloc design
  • Extremely high vapor and particle tolerance
  • For harsh process conditions
  • Various sizes and versions

Benefits of the DOLPHIN LX series

DOLPHIN LX are robust and reliable liquid ring vacuum pumps in a monobloc design. The directly flange-mounted motor makes them exceptionally compact. Therefore, DOLPHIN LX are very well- suited for integration into existing systems or machines.

Thanks to the robust liquid ring principle, even the extraction of particle-laden gases or highly saturated vapors can easily be carried out.

DOLPHIN LX are available in different construction materials and ATEX versions.

Different operating fluids may be used according to process conditions.

All DOLPHIN LX products

  • DOLPHIN LX 0030–0055 B
    DOLPHIN LX 0030–0055 B

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 18.2 ACFM max. 33.0 ACFM

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  • DOLPHIN LX 0110–0180 C
    DOLPHIN LX 0110–0180 C

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 48.8 ACFM max. 84.7 ACFM

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  • DOLPHIN LX 0260–0430 C
    DOLPHIN LX 0260–0430 C

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 140.7 ACFM max. 267.8 ACFM

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DOLPHIN VL

dolphin_vl_0170_a_continuousflow
The complete solution

  • Unit installed on base frame
  • Operating fluid separator
  • System control
  • Wide range of sizes
  • Continuous flow, partial or total recirculation system

Benefits of the DOLPHIN VL series

DOLPHIN VL is the new generation of liquid ring vacuum pump units. They are based on our proven DOLPHIN LM/LT technology. The unit is installed on a base frame with operating fluid separator and complete instrumentation.

The VL series has been designed to support a wide range of processes in many industrial sectors. Such as plastics, food and beverage, chemical and pharmaceutical industries.

DOLPHIN VL units are available with either single- (DOLPHIN LM) or two-stage (DOLPHIN LT) vacuum pumps. More than ten sizes allow an exact match to every process.

If required by the process conditions, other operating fluids than water may be used. DOLPHIN VL are available as a simple continuous flow system, or as a partial or total recirculation system.

All DOLPHIN VL products

  • DOLPHIN VL 0100–0270 A Continuous Flow
    DOLPHIN VL 0100–0270 A Continuous Flow

    Ultimate pressure:
    97.5 TORR
    Nominal pumping speed:
    min. 57.7 ACFM max. 157.1 ACFM

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  • DOLPHIN VL 0100–0270 A Partial Recirculation
    DOLPHIN VL 0100–0270 A Partial Recirculation

    Ultimate pressure:
    97.5 TORR
    Nominal pumping speed:
    min. 57.7 ACFM max. 157.1 ACFM

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  • DOLPHIN VL 0100–0270 A Total Recirculation
    DOLPHIN VL 0100–0270 A Total Recirculation

    Ultimate pressure:
    97.5 TORR
    Nominal pumping speed:
    min. 57.7 ACFM max. 157.1 ACFM

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  • DOLPHIN VL 0130–0320 A Continuous Flow
    DOLPHIN VL 0130–0320 A Continuous Flow

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 75.3 ACFM max. 188.3 ACFM

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  • DOLPHIN VL 0130–0320 A Partial Recirculation
    DOLPHIN VL 0130–0320 A Partial Recirculation

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 75.3 ACFM max. 188.3 ACFM

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  • DOLPHIN VL 0130–0320 A Total Recirculation
    DOLPHIN VL 0130–0320 A Total Recirculation

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 75.3 ACFM max. 188.3 ACFM

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  • DOLPHIN VL 0430–0750 A Continuous Flow
    DOLPHIN VL 0430–0750 A Continuous Flow

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 250.7 ACFM max. 417.8 ACFM

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  • DOLPHIN VL 0430–0750 A Partial Recirculation
    DOLPHIN VL 0430–0750 A Partial Recirculation

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 250.7 ACFM max. 417.8 ACFM

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  • DOLPHIN VL 0430–0750 A Total Recirculation
    DOLPHIN VL 0430–0750 A Total Recirculation

    Ultimate pressure:
    25 TORR
    Nominal pumping speed:
    min. 250.7 ACFM max. 417.8 ACFM

    Learn more
  • DOLPHIN VL 0530–0800 A Continuous Flow
    DOLPHIN VL 0530–0800 A Continuous Flow

    Ultimate pressure:
    97.5 TORR
    Nominal pumping speed:
    min. 327.2 ACFM max. 510.2 ACFM

    Learn more
  • DOLPHIN VL 0530–0800 A Partial Recirculation
    DOLPHIN VL 0530–0800 A Partial Recirculation

    Ultimate pressure:
    97.5 TORR
    Nominal pumping speed:
    min. 327.2 ACFM max. 510.2 ACFM

    Learn more
  • DOLPHIN VL 0530–0800 A Total Recirculation
    DOLPHIN VL 0530–0800 A Total Recirculation

    Ultimate pressure:
    97.5 TORR
    Nominal pumping speed:
    min. 327.2 ACFM max. 510.2 ACFM

    Learn more