VACUUM PUMP/ LEAK DETECTOR CATALOG
Mel Sattler Production Manager
Thomas Dobler Sales Manager
Chris Long CFO
Ken Harrison President & CEO
GNB is a company of technical experts serving other technology experts. Since our beginning in 1968 it has been our commitment to technology that has set us apart. During this time we have produced outstanding, innovative products that have met the most demanding applications in areas such as temperature extremes, large sizes, radiation levels, vacuum levels, vibration levels, and unique applications.
Introduction
However GNB is more than just technology, we are passionate about building winning relationships. It is our corporate vision that customers will be so impressed that they say, “Wow! We want to do business with GNB again.”
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Other vacuum product companies produce large catalogs and encourage customers to design their systems around the standardized products. However, with GNB you can have it your way. You can select a standard item or we will custom make one just the way you want it. Consequently, GNB is no ordinary vacuum products company. This brochure depicts a sampling of our most popular products, but it should be treated as an idea book—not an exhaustive product catalog. No matter what your application is, please give us a call; and we will gladly share our technical expertise.
Vacuum Pump Products
Vacuum Pump Products
04~06
High Vacuum Pumping Technologies
07~08
Dry Screw Pumps
09
Single Stage Screw Pumps
10~11
Single Stage Blower Packages
12~13
Dual Stage Rotor Pumps
14~15
Dual Stage Screw Pumps
16~17
Dual Stage Pump Packages
18~20
GNB Turbo Molecular Pumps GNB Turbo Molecular Pumps
21~24
TCDP-II Turbo Pump Controller
25
GNB Rotary Vane Pumps GNB Rotary Vane Pumps
26~27
Leak Detecting Products Leak Detecting Products
28
Leak Detecting Process
29
Helium Leak Detectors
30
Vacuum Pump Products Vacuum Pump Products The products in this family are: Dry Screw Pumps, Turbo Pumps, Rotary Vane Pumps, and Dry Scroll Pumps. Introduction to Pumps Vacuum pumps are machines that remove gas molecules from a closed system. Rough vacuum pumps are required to remove a large volume of gas, but they are not able to achieve a high vacuum level. High vacuum pumps typically cannot tolerate a high gas load, but they are able to pump down a system to a lower pressure. Ultra High Vacuum (UHV) pumps are able to take the vacuum system down to even lower pressures. Although there are no absolute technical definitions for the different vacuum ranges, the gas flow properties change as the vacuum pressure decreases. In common practice the rough vacuum range is between 7.5 Torr (10 mbar) to 7.5x10-4 Torr (1x10-3 mbar), the high vacuum range is 7.5x10-4 Torr (1x10-3 mbar) to 7.5x10-9 Torr (1x10-8 mbar), and the ultra-high vacuum range is a pressure less than 7.5x10-9 Torr (1x10-8 mbar). In the rough vacuum pressure range, there are a variety of pump designs that are available. Examples include: rotary vane pumps, diaphragm pumps, reciprocating piston pumps, scroll pumps, screw pumps, and roots blowers. In the high vacuum range there are diffusion pumps, turbomolecular (turbo) pumps,and cryogenic (cryo) pumps. To achieve UHV pressures, ion pumps and titanium sublimation pumps are used. Some turbomolecular and cryogenic pumps can also be used when they are specifically designed for UHV pressures. Rough Pumping Technologies Pumps can be categorized into pumps that use oil and dry pumps. Oil-sealed pumps use oil to lubricate and fill in the small gaps that would allow gas molecules to escape from higher pressures back to the low pressure areas. Advantages of the oil-sealed pumps are that they can achieve a long operational life and they can pump all gasses including those with a very small sized molecule. The disadvantages are that they require regular maintenance because the oil will become contaminated and needs to be changed, and under some conditions they can allow oil to back stream into the vacuum system and contaminate it. Rotary vane pumps and roots blowers are examples of oilsealed pumps. Diffusion pumps also use oil which can backstream, although they use a different technology for pumping.
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Vacuum Pump Products Dry pumps have the advantage that they do not use oil and therefore can be used in the cleanest of applications with no risk of contaminating the process with oil. However, because they do not use oil to fill in the small clearances between moving parts, they do not perform as well when pumping the smallest atoms such as helium and hydrogen. They also can face challenges with heat dissipation which in turn can create interferences between closely fitting moving parts due to thermal expansion. Rotary Vane Pumps A rotary vane pump is an oil-lubricated rough vacuum pump. They use sliding vanes to compress gas from a point of lower pressure, decreasing the volume of the gas until its pressure rises above atmospheric pressure and then expels it into the exhaust line. These are long life pumps that are economical to purchase and operate. They are used for numerous smaller applications such as vacuum sealing/packaging, glove boxes, or to hold a vacuum in vacuum jacketed piping. They are also commonly used as a backing pump for a turbo pump, roots blower or cryo-pump. They have an advantage over dry backing pumps in that they do not allow the background helium from the atmosphere into the vacuum system and this is better for helium leak checking. Rotary vane pumps can be made with a single stage or they can have multiple stages where the exhaust from one stage is sent to the inlet of the next. Multistage pumps can therefore achieve a higher vacuum level.
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Vacuum Pump Products Dry Screw Pumps Dry screw pumps are able to pump a much greater volume of gas than a rotary vane pump. In this style of pump, two screw rotors turn in opposite directions in order to trap the gas and move it to the discharge. There is a tight tolerance between the screws and their housing in order to minimize leakage past the screws.
The body of the pump is water-cooled or air cooled to dissipate heat, but the rotors will run hot in order to keep contaminants from forming inside the pump. A variety of coatings such as ceramic or nickel-Teflon® are available to coat the inside of the pump to prevent corrosion and provide lubrication, depending on the application. GNB offers both constant pitch and variable pitch screw pumps. The variable pitch can provide better heat dissipation and lower power consumption, while the constant pitch has an exceptionally short screw length which reduces the buildup of contaminants.
Roots Blowers A roots blower is sometimes called a lobe pump. Two symmetrically shaped lobes rotate in opposite directions. This action is able to move large quantities of gas molecules. Roots blowers are typically classified as an oil lubricated pump, but the modern blowers, such as the pump that GNB provides, have the oil separated from the vacuum so that the vacuum system is not to be contaminated. Often roots blowers are used in combination with another pump. GNB offers pump packages that have a roots blower and a dry screw pump mounted together in one system.
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Vacuum Pump Products High Vacuum Pumping Technologies Turbo Pumps Turbo molecular pumps move gas molecules from a low pressure area to a high pressure area through a series of rotating blades that have different angles as the pressure inside the pump increases. The series of blades are machined out of a single block of aluminum.
Between the blades there are stators held by the housing of the pump. The rotor spins at a very high velocity. Turbo pumps with larger diameters may spin at 15,000 rpm while smaller turbo pumps will exceed 40,000 rpm. In the past, some turbo pumps used oil to lubricate their high speed bearings, and this oil could allow a small amount of oil to migrate into the vacuum system. Most new pumps use ceramic bearings with grease or the rotors are magnetically levitated so that they only use mechanical bearings (bearing surfaces) during low speeds at startup or shutdown. Turbo pumps should not be placed in a system where any object could ever fall into them. They have protective screens over their inlets which will prevent solid objects from falling in, but they also should not have moisture or any other contaminats enter them. Turbo pumps can only operate effectively in the high vacuum range. If the gas load is too high, they can overheat. Some turbo pumps can be started at an atmospheric pressure and they will slowly increase in speed (spin up) as the pressure decreases. All turbo pumps require backing pumps. These are roughing pumps which lower the pressure at the discharge port. The ultimate pressure for a properly configured turbo pump is around 1x10-10 Torr (1.3 x 10-10 mbar). To achieve this pressure, the turbo pump must be very clean. Baking out the turbo pump to drive out moisture and other contaminants helps the cleaning process.
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Vacuum Pump Products Cryo-Pumps A cryo-pump is a vacuum pump that creates a high vacuum by freezing the gas molecules, so they are no longer free to move about in the system. Cryo-pumps are able to pump water vapor very well. Water vapor is typically the bulk of the gas load in the high vacuum range. A limitation of cryo-pumps is their ability to pump gasses that freeze at very low temperatures. For this reason they must employ other technologies to pump smaller molecules such as helium and hydrogen. Although GNB does not offer cryo-pumps, GNB does manufactures cryo-coils and baffles that are used to trap water vapor and increase the pumping speed. Diffusion Pumps Another technology for a high vacuum pump is an oil diffusion pump. A low vapor pressure oil (often silicon oil) is heated so that it rises rapidly through a central pipe. Next the oil vapor is expelled from the pipe and cooled. These high velocity jets of oil vapor carry along the gas molecules as the oil vapor now rapidly descends back down toward the liquid oil reservoir. As the oil changes state and becomes a liquid again, the gas molecules are released at a higher pressure than where they were first picked up. A backing pump then removes these gas molecules from the diffusion pump. Diffusion pumps have no moving parts and are a cost effective option; however some oil can migrate from the pump into the vacuum system. GNB manufactures baffles which are placed above the diffusion pump to block 99% of the oil from entering the system.
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Dry Screw Vacuum Pumps Dry Screw Vacuum Pumps Energy saving designs with a very short gas path inside the pump to reduce residue buildup path inside the pump. Screw Pumps
Options: · · · ·
Standard screw coating is Defric, options include nickel, nickel-teflon and nano-ceramic coating Standard pumps are water-cooled but air-cooled motors and air-cooled pumps are available Pumps can be sold as pump blower packages Explosion proof motors
Advanced Microprocessor Control: The visual graphics microprocessor control provides status monitoring. Alarm parameters can be set to ensure operational excellence. Remote control software provides control room monitoring of one or more pumping systems.
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Single Stage Screw Pumps
Screw Pumps
Single stage rotors provide the shortest gas path for minimal conformation and heat load.
Model
A
B
C
D
E
G
H
K
L
M
14.96 [380] 16.14 [410] 16.93 [430]
26.10 [663] 26.69 [678] 25.59 [650]
21.73 [552] 22.32 [567] 21.22 [539]
7.48 [190] 8.58 [218] 8.98 [228]
29.13 [740] 32.95 [837] 34.76 [883]
32.05 [814] 35.24 [895] 36.22 [920]
22.68 [576] 22.91 [582] 22.05 [560]
26.30 [668] 25.39 [645] 24.69 [627]
4.13 [105] 4.13 [105] 2.87 [73]
8.82 [224] 7.91 [201] 7.24 [184]
in[mm] in[mm] in[mm] in[mm] in[mm] in[mm] in[mm] in[mm] in[mm] in[mm]
SWP-S 80-A SWP-S160-A SWP-S180-A
Dimensions in inches [mm]
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Single Stage Screw Pumps SWP-S80,160,180
Screw Pumps
Technical Data for Single-Stage Dry Screw Pumps Model
Unit
Pumping Speed (50Hz/60Hz) Ultimate Pressure (50Hz/60Hz)
L/min m³/hr cfm Torr
S80-A 1300/1600 80/96 47/57
S160-A 2150/2500 130/156 77/92
≤ 7.5x10-3
Mbar
-2
≤ 1x10 ≤1 50/60 220-440 6 4.47 NW50 NW40 28-57
Pa Frequency Voltage
Canned Motor
Rated Power Inlet Outlet Pressure
Connection
Cooling Water
Min. Flow Temp. Connection Pressure Dilute Flow
N2 Sealing Flow
Hz V HP Kw
4 2.98
PSI L/min, gal/min °C, °F
6 4.47
3 L/min 15°C-7L/min 30°C 0.8 gal/min 59°F-1.9 gal/min 86°F RC3/8” 22-29 0-60 L/min, 0-2.11cfm 0-20 L/min, 0-0.706cfm 0-20L/min 0-0.706 cfm Swagelok1/4”
PSI L/min, cfm L/min, cfm
Connection Dim.
S180-A 2500/3000 150/180 88/106
mm
814x380x663
895x410x678
920x430x650
in.
32x15x26
35x16x27
36x17x26
Weight
Kg/lb.
280 kg, 617 lbs.
300 kg, 661 lbs.
320 kg,705 lbs.
Noise
Db(A)
