Physical Vacuum Boosters are dry pumps that meet most of the great machine pump requirements. They work on good displacement principle and are accustomed to raise the effectiveness of water ring /oil ring /rotating vane /piston pumps and steam or water ejectors. They are utilized in combination with any one of the aforementioned pumps, to over come their limitations. Vacuum booster pumps offer very desirable characteristics which make them probably the most economical and energy efficient selection.

The major advantages are:-

(a) Might be built-in with any installed vacuum system including Steam Ejectors, Water Ring Pumps, Oil Sealed Pumps, Water Ejectors, an such like.

(b) The vacuum booster is a Dry Pump because it doesn't use any pumping fluid. It pushes vapor or gases with equal ease. Small amounts of condensed liquid can be moved.

(d) Vacuum boosters are energy efficient. Frequently a variety of Vacuum Booster and ideal backup pump leads to paid down energy consumption per-unit of pumping rate. They offer high pumping speeds even at low pressures.

(d) Boosters boost the working vacuum of the process, generally very needed for process

performance and efficiency. Vacuum Booster can be utilized over a wide working pres-sure range,

from 100 Torr down seriously to 0.001 Torr (mm of mercury), with suitable arrangement of backup pumps.

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(e) It's very low pump friction losses, thus requires relatively low power for high volumetric

Rates. Generally, their speeds, at low vacuums are 20-30 times more than corresponding vane

pumps / ring pumps of comparable power.

(f) Usage of electronic control devices such as for example Variable Frequency Control Drive allow to switch

Machine boosters operating faculties to conform to the detailed requirements of the primary

vacuum pumps. Hence they could be easily incorporated into all current moving set up to boost their


(g) Vacuum boosters do not have any valves, rings, stuffing field etc., therefore, do not require regular maintenance.

(h) Due to vapor compression action by the booster, the pressure at the release of booster (or intake of backup pump) is maintained high, leading to benefits such as low back streaming of primary pump water, powerful condensation also at greater condenser temperatures and improvement of the backup pump efficiency.

The Dining table below provides rough estimate of how the boosters increase the working vacuums of the processes when installed in combination with various types of industrial machine pumps currently utilized in the industry. Identify more about Arizona real estate - by browsing our thought-provoking web site. They could successfully replace multistage steam ejectors, resulting in significant steam savings and paid down loads o-n cooling towers. Physical Vacuum Boosters are adaptable machines and their traits depend largely o-n backing pump. Numerous kinds of backing pump can be used, depending upon the machine need and ultimate vacuum requirements.

Nevertheless, the final vacuum is governed by the suitable selection of the backing pump and booster

arrangement. The table below provides wide range of vacuum achieved with different assistance pumps combinations.

Vacuum Pump Expected machine Vacuum o-n installation Array of Booster (single phase)

Single Stage Ejector 15-0 Torr 1-5 - 30 Torr

Water Ejector 100 Torr 10 - 20 Torr

Water Ring Pump 4-0 - 60 Torr 5 - 1-0 Torr

Liquid Ring Pump 2-0 - 30 Torr 2 - 5 Torr

Piston Pumps 2-0 - 30 Torr 2 - 5 Torr

Rotary Piston Pumps 0.1 Torr 0.01 Torr

Circular Vane Oil Pump 0.01 - 0.001 Torr 0.001 - 0.0001 Torr.

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As an example, if a process is using water band Pump, the estimated working cleaners could be of the order of approximately 670-710 mmHg gauge (90-50 mmHg abs.), mainly depending on the water temperature and pump design. The vacuum levels of-the order of 5-10 Torr could be easily reached, each time a Booster is installed prior to the water ring pump, in series. In-a Multi-Stage enhancement installation, vacuum degrees of the order of 0.5 Torr & better can quickly be anticipated. Physical Boosters offer a com-pletely dry pumping answer and don't enhance any steam weight, unlike steam ejectors, and therefore, do not need significant inter phase condenses. At low vacuums, higher pumping rates are required to maintain the through-put, because the specific volume increases with the increase in vacuum. Vacuum boosters improve the pumping speeds by about 3-10 times based upon the selection by virtue which one can expect through-puts and higher process rates. The disadvantages of steam ejector system including sensitivity to motive water pressures and discharge pres-sure are overcome easily from the Mechanical Boosters, considering that the volumetric displacements/pumping speeds are insensitive to the inlet & outlet working pressures.

Standard Booster Installation

(1) Evaporator (2) Gauge (3) Condenser (4) Mechanical Booster

(5) copy Pump

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Calculating the Pump Capacity: -

In line with the fundamental gas regulations PV= RT, an expression may be made for Volumetric Flow Rates needed for putting different vapors/gases. On the basis of the Mass flow rates one can estimate the pump capacity required.

V = Dhge.. Tgas / P Q1/M1 + Q2/M2............. Qn/Mn

Where V = Inlet Volume flow rate m3/hr.

Page1=46 = Universal fuel Constant, 83.14 mbar m3/ Kgmol x K

Tgas = Gas/Vapor abs. Temperature, in K

G = Process Absolute Pres-sure in mbar

Q1, Q2, Q3 = Gas / Vapor flow rate, in Kg/hr.

M1, M2,M3 = Molar size, in Kg/mol. of fuel /vapor.

Booster Operation:

Power Constraints restrict the total differential pressures over the booster. This requires to ensure the total differential pressure throughout the Booster must not exceed the limits. This is guaranteed by some of the following means:-

1.) Manual method:- Initially the fore pump is switched on before the required cut in force is achieved and there-after the booster is switched on.

2.) Auto method:- Installation of mechanical By-pass arrangement across-the booster or hydro kinematic travel or Variable Frequency Drive (VFD). In this arrangement, the fore and booster pump could be started simultaneously from atmosphere.

Benefits of using Digital Variable Speed Device

Electric A.C Variable Frequency Get a grip on Drives are most favored units used to modify the

Booster pace to fit the various load conditions of-the process. These devices enhance the efficiency of the Boosters and offer various advantages for the difficulty free operation.

The major advantages are: -

1. Booster can be started right from atmosphere.

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Boosters for Vacuum Process Everest Transmission January, 2005.

2. No need for independent force change, by pass line or offloading valves.

3. Substantial savings in power.

4. Stops over-heating of Boosters.

5. Shields the Booster against excess and extortionate pressures.

6. Offers c-omplete protection to engine against over voltage, under voltage, over current,

Over-heating, ground fault.

7. Reduces the requirements of overload relays and split up starter for your Motor. Dig up more about Home Improvement Ideas You Will Be Dying To Try - by browsing our riveting encyclopedia.

8. Automatically adjusts the speed of Booster between low and high range set providing high

pumping speeds with relatively low input power.

The Electronic Variable Fre-quency Get a grip on Drive is just a microprocessor based digital drive which can be specifically developed to satisfy the requirements of the Booster allowing it to work directly from atmosphere along with appropriate fore pump. Traditionally, Boosters can be started only after reaching forefront machine in the range-of 30 - 10-0 Torr, since they are not recommended for direct discharge into the atmosphere. Use of Pres-sure Switch, Hydro kinematic drive and by pass valves is important to prevent the overloading of the Booster. Considering that the drive is set to manage the Booster speed automatically, keeping the strain on engine within permissible limits nevertheless using the installation of Electronic Variable Fre-quency Control Drive all the traditional methods could be bypassed. This allows the Booster to start out simultaneously with backup pump. When the backup-pump and Booster are started the Booster speed is reduced by the drive to the pre-set degrees and as the vacuum is created the Booster speed sees, achieving the final pre-set speed, providing many maximum performance over the whole range. Since all the variables are easily programmable, one can modify the booster pumping speeds to match the device needs quickly and easily. The drive limits the current to the motor and safeguards the motor against over voltage, under voltage, electric thermal, overheat ground faults. i.e. protects the motor against all possible defects.

External computer get a handle on overall facets of booster performance is possible via RS485 serial interface included in the drive electronics. This permits the Booster to be incorporated into any computer-controlled operating-system.

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