Compressed Air and Vacuum Systems 1MB | PDF

Compressed Air and Vacuum Systems 1MB | PDF
Compressed Air and Vacuum Systems
ISO 9001 Certified
The Gast
The
GastGroup
Difference
Group
Difference
For over 90 years, Gast Manufacturing has been providing innovative air solutions
to a broad breadth of customers. With the relatively recent addition of JUN-AIR,
we have expanded our capabilities and formed, “The Gast Group.” Together, our
diverse engineering background and pneumatic experience allow us to provide both
component and system solutions to meet all of your pneumatic needs...backed by
our strong commitment to quality and customer support.
Products for Almost Any Application – Worldwide
We offer an extensive and versatile line of air-moving products, including vacuum pumps, compressors, air motors,
gearmotors, vacuum generators, and regenerative blowers. We design and build these components for original
equipment manufacturers worldwide, but we also develop complete pneumatic solutions to solve tough customer
challenges.
To ensure fast, efficient delivery of products, Gast has a vast network of sales representatives/distributors throughout
the United States and the world. Plus, we maintain direct sales and service facilities in Europe, Hong Kong, and
Shanghai, China.
Unparalleled Design Expertise
Unlike other manufacturers, who might expect you to modify your pneumatic system to fit their available product(s),
Gast is committed to finding the right product to meet your specific needs. If we don’t have a high-quality, off-the-shelf
product to fit your existing application or meet your anticipated needs, we’ll propose customized cost-effective design
options that will serve your special requirements. We can even develop and produce your complete pneumatic system
for you.
Our experienced Research and Development engineers and Product engineers work together to analyze customer
needs and use computer-aided design to generate timely solutions for air-handling problems. The design team has
one goal: to create problem-solving solutions that capitalize on the latest available technology, meet all application
requirements, and benefit from cost-effective production methods. The end result: products and solutions that are the
best value in the marketplace for our customers.
A Lasting Commitment to Quality
We invest heavily in both equipment and people to maintain the consistent quality for which our products are known
worldwide, and we have done so since day one. As early as 1983, we implemented a total quality process designed to
ensure the quality of our products. In keeping with that tradition, Gast has achieved ISO 9001 certification, making us
a member of the elite group of manufacturing companies in the world to receive that certification.
European Community Directives
With extensive sales outside the United States, Gast has pledged to conform to the European Community Directives.
These directives contain essential requirements concerning health, safety, environment, and consumer protection
for all products targeted for the European Community market. Currently, all Gast products available for sale in
the European Community are in compliance with the Machinery, Low Voltage, and Electromagnetic Compatibility
Directives.
Pictorial and dimensional data is subject to change without notice. The information presented is based on technical data and test results of nominal units. It is believed
to be accurate and is offered as an aid in the selection of Gast products. It is the user’s responsibility to determine suitability of the product for intended use and the
user assumes all risk and liability whatsoever in connection therewith. Environmental and application conditions may affect advertised life.
2 Gast Compressed Air and Vacuum Systems
www.gastmfg.com
Why use a Compressed Air and Vacuum System?
Many find it difficult to decide whether to use stand-alone pumps or complete tank packages for their applications.
The tank system offers many advantages, which satisfy:
High Volumes
Quiet Operation
If your application requires an instantaneous supply of high
pressure or vacuum, then the reservoir provided by a tank
system is essential. Even the largest of pumps has to start at
atmospheric pressure and therefore will not be able to give that
instantaneous supply of pressure/vacuum.
In a tank system the pump runs on demand, which means that
it is not operating a good part of the time. No operation, no
operating noise.
Longer Pump Life
A tank system makes it possible to utilize two pumps on one
tank. Add a pressure switch and alternator control to start/stop
the pump(s) only when needed. This allows the pump to cool
down and “rest” between cycles to prolong operating life.
Cost Savings
Pulse Free
Pulse-free air is required by many pneumatic systems for
proper operation of pneumatic tools or components. A tank
provides pulsation-free air from the reciprocating compressor.
Central System
Small industrial shops where different tools are required at different times find tank systems ideal, since one tank system can
supply air to multiple locations.
Using a tank system can reduce initial maintenance and replacement costs. Here’s why: Applications that require high
volumes of air in intermittent cycles can use relatively
small pumps. The longer the interval between cycles, the more
applicable a tank system can be. For example, a 1 HP compressor on a tank can supply the same amount of flow for one
minute as a stand alone 10 HP compressor.
Call your Gast distributor
for custom systems
Your Gast distributor has a complete line of complementary products to satisfy most
of your requirements for pneumatic systems of all kinds. If your application requires
modification of an existing system or a new design, your Gast distributor will be
glad to assist you. Gast tank systems, just as all Gast products, can be modified or
customized to satisfy the needs of quantity users. A list of distributors, both domestic
and international, are listed on our website at www.gastmfg.com or call us at
269-926-6171 for the stocking distributor in your area.
www.gastmfg.com
Gast Compressed Air and Vacuum Systems 3
2 Gallon Compressed Air Systems
Applications
• Beverage dispensing
• Lab use
• Portable displays
• Commercial door actuation
• Portable - off site use
71R142-P075T-D300X
Includes
• Pressure switch
• Manual drain
• Pressure safety valve (ASME)
• Pressure gauge
• Unloading capability
• Globe valve
• 100% oilless operation
DOA-P206T-AA
ROA-P206T-AA
1HAB-11T-M100X
Model Number
Tank
CFM @ psig
Recovery of Shipping
Size ON/OFF 0 to 100
Standard
Motor Weight
Gallons
0
10
30
50
70 100
psig
Setting
Setting
Voltage
HP lbs
ROA-P206T-AA
2
.76
.68 .55
.41 .27.1070/100
5:00
1:55 115-60-1 1/8 39
DOA-P706T-AA
2
1.00
.85
.20
1:30
0:55
1HAB-11T-M100X
2
1.25 1.10 .85
.65 .5 .3570/100
2:55
0:55 115-60-1 1/6 49
IHAE-11T-M104X
2
1.25 1.10 .85
.65 .5 .3570/100
2:55
0:55 220-50-1 1/6 49
1LAA-11T-M100X
2
1.5 1.401.15
.88 -
- 30/50
0:50
0:20 115-60-1 1/6 49
2HAH-11T-M200X
2
1.65 1.551.30 1.15 .90.8570/100
1:45
0:30 115-60-1 1/4 56
71R142-P075T-D300X
2
2.00
1:30
0:25
.50
1.80 1.50
4 Gast Compressed Air and Vacuum Systems
-
-
30/50
1.25 1.10 .90 70/100
115-60-1
1/8
115-50/60-11/3
39
42
www.gastmfg.com
12, 20, 30 Gallon Compressed Air Systems
7HDD-11T-M750X
Applications
• Beverage dispensing
• Cylinder actuation
• Pneumatic temperature control
• Photo processing
• Spray painting
• Pneumatic logic
• Small to medium shops and filling stations
Includes
• ASME coded tank
• Pressure switch
• Manual drain
• Pressure safety valve (ASME)
• Pressure gauge
• Globe valve
• Magnetic starter (6HCA, 7HDD, 8LDF and
8HDM not shown in picture)
• 100% oilless operation (auto drain assembly
K602 optional)
*71R640-P64T-D500X
5HCD-11T-M550X
Tank CFM @ psig
Recovery of
Shipping
Size
ON/OFF
0 to Off
Standard
Motor
Weight
Model Number
Gallons0 10305070100 psigSetting Setting Voltage HP lbs
Min/Sec
Min/Sec
2LAF-11T-M200X
12 2.10 1.801.70 1.50 --
3HEB-11T-M345X
--
30/50
2:15
0:55
115-60-1 1/4
55
12 2.402.201.851.501.301.15 80/100 5:45
1:55
115-60-1 1/3
93
3HBE-11TF-M303X 12 2.402.201.851.501.301.15 80/100 5:45
1:55
220-50-1 1/3
93
3LEM-11T-M345X
12 2.9 2.702.20 2.00 --
--
30/50
1:45
0:45
115-60-1 1/3
93
3LBA-11T-M300X
12 3.1 2.702.20 1.80 --
--
30/50
93
1:45
0:45
115-60-1 1/3
*71R640-P64T-D500X 12 3.503.152.652.201.851.46 90/110 5:43
1:13
115-60-1 3/4 105
*71R640-P67T-D500X 12 3.503.152.652.201.851.46 90/110 5:43
1:13
115-60-1 3/4 105
*71R640-P65DT-D500X12 7.006.305.304.403.702.92 90/110 3:13
0:45
115-60-1 3/4 115
4HCC-11T-M450X
20 3.503.302.802.402.101.70 80/100 7:00
2:50
115-60-1 1/2 118
4LCB-11T-M450X
20 4.5 4.003.20 3.00 --
2:25
1:00
115-60-1 1/2
5HCD-11T-M550NGX20 4.704.403.903.402.902.40 80/100 5:00
--
30/50
1:55
115-60-1 3/4 121
118
5HCD-11TA-M550X 20 4.704.403.903.402.902.40 80/100 5:00
1:55
230-60-1 3/4 121
6HCA-11T-M616X
30 5.405.204.704.303.903.20 80/100 5:50
2:25
115-60-1 1
124
6HCA-11TD-M617
30 5.405.204.704.303.903.20 80/100 5:50
2:25
460-60-3 1
123
6LCF-11T-M616X
30 6.30 6.005.50 5.00 --
2:00
0:50
115/230-60-11
7HDD-11T-M750X
30 9.008.407.256.505.755.00 80/100 4:15
1:35
115-60-11 1/2155
7HDD-11TA-M750X 30 9.008.407.256.505.755.00 80/100 4:15
1:35
230-60-11 1/2155
--
30/50
125
7HDD-11TC-M853
30 9.008.407.256.505.755.00 80/100 4:15
1:35
230-60-3 2
155
7HDD-11TD-M853
30 9.008.407.256.505.755.00 80/100 4:15
1:35
460-60-3 2
155
8HDM-11TC-M853
30 11.0010.259.25 8.50 7.50 7.00 80/100
1:10
230-60-3
2
160
460-60-3
2
160
230-60/50-1 2
162
3:30
8HDM-11TD-M853
30 11.0010.259.25 8.50 7.50 7.00 80/100
3:30
1:10
8LDF-11TA-M850X
30 12.50 12.0010.60 9.3
0:45
0:20
--
--
30/50
* These units also include
•
•
•
•
•
•
•
UL 1450 listed
Enhanced design to start under any conditions
Fully enclosed compressor design for safe operation
All inclusive, fully assembled system
Easy to install and maintain
Automatic drain (optional)
Pressure switch with on/off toggle switch, cord, and plug
www.gastmfg.com
Gast Compressed Air and Vacuum Systems 5
60 Gallon Compressed Air Systems (Duplex)
Applications
•Hospitals
•Medical/dental clinics
•Pneumatic temperature control
•Small to medium shops and filling stations
•Pneumatic logic
•Clean room environment
Includes
•ASME coded tank
•Easy-to-use electric panel (see page 10)
•Manual drain
•Pressure safety valve (ASME)
•Pressure gauge
•Globe valve
•100% oilless operation (auto drain assembly
K602 optional)
8HDM-30DTD-M853
Pump Up Time in Minutes: Seconds (Approx.)
Model Number
of both Units @ psig
Tank
Total CFM
#1Pressure #2 Pressure On-Off
Recovery of Recovery of
Shipping
Size Setting
Setting
Setting
1 Pump
2 Pumps
Voltage/Motor
Weight
Gallons 0
10
30
50
70
100 On/Off psig On/Off psig or 0-90 psig 80-100
70-100
Enclosure
HP
lbs
6HCA-15DTA-M616X60 10.8010.409.40 8.607.807.00 80/100
70/90
6:40
3:10
2:25
230-60-1 Open1
425
6HCA-15DTC-M617 60 10.8010.409.40 8.607.807.00 80/100
70/90
6:40
3:10
2:25
230-60-3 Open1
425
6HCA-15DTD-M617 60 10.8010.409.40 8.607.807.00 80/100
70/90
6:40
3:10
2:25
460-60-3 Open1
425
7HDD-69DTA-M750X 60 18.00 16.80 14.50 13.0011.5010.50 80/100
70/90
4:20
2:25
1:40
230-60-1 Open 1.5
450
7HDD-69DTD-M853 60 18.00 16.80 14.50 13.0011.5010.50 80/100
70/90
4:20
2:25
1:40
460-60-3 Open 1.5
450
8HDM-30DTC-M853 60 22.00 20.50 18.50 17.0015.0014.50 80/100
70/90
3:20
1:40
1:10
230-60-3 Open 2
455
8HDM-30DTD-M853 60 22.00 20.50 18.50 17.0015.0014.50 80/100
70/90
3:20
1:40
1:10
460-60-3 Open 2
455
6 Gast Compressed Air and Vacuum Systems
www.gastmfg.com
Vacuum Tank Systems (Simplex and Duplex)
Applications
•Vacuum thermo-forming
•Food processing
•Impregnation and degassing
•Avionics
•Tansfer/handling equipment
Includes
• Swing type check valve
• Vacuum switch
• Large inline filter/exhaust muffler
• Easy-to-use electrical panel
(Duplex only - See page 11)
• Vacuum gauge
• Pre-tank filter AV460C optional
0523-V184T-G588DX
2565-V93DTC-T336
Tank
Simplex
Size
Model Number
Approximate Pump Down
Switch Setting inHg Speed (minutes: seconds)
(Gallons)
Off
On
0-25 inHg
System Voltage
O = Oilless
20-25 inHg
L = Lubricated
HP
Shipping
Weight
lbs
0523-V81T-SG588DX
2
25” 20”
0:15
0:09
115-60-1/L 1/447
0523-V184T-G588DX
2
25” 20”
0:15
0:09
115-60-1/O 1/446
1023-V17TA-SG608X
30
25”
20”
1:30
0:45
230-60-1/L 3/4191
1023-V126T-SG608X
30
25”
20”
1:30
0:50
115-60-1/O 3/4191
1023-V126TA-SG608X 30
25”
20”
1:30
0:50
230-60-1/O 3/4191
Tank
Approximate Pump Down
Switch Setting inHg
Duplex
Switch #1 Switch #2
Model Number
Size
Gallons Off
On
Off
On
Speed (minutes;seconds)
0-25 inHg
20-25 inHg 17-25 inHg
(2 pumps)
(1 pump)
(2 pumps)
System Voltage
Shipping
Lubricated-L
Oilless-O
Weight
HP
lbs
2565-V93DTC-T336 60 25”20”20” 17” 0:30
0:29
0:17
230-60-3/L 1.5 450
6066-V113DTC-T339 60 25”20”20” 17” 0:29*
0:15*
0:13*
230-60-3/O
5
0.25** 0.10** 0:8**575
6066-V113DTD-T339 60 25”20”25” 17” 0.29*
0.15*
0:13*
460-60-3/O
5
0.25** 0.10** 0.8**575
* Pump running cold
**Pump operating at stabilized
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Gast Compressed Air and Vacuum Systems 7
Accessories
ACCESSORY Pressure and
Vacuum Tank
Assemblies
(Complete Package
Minus Pump)
Pressure
and Vacuum
Switches
Check
Valves
Gauges
PART NO. DESCRIPTION
USED ON
AF599D
2 Gallon Tank Assembly for Roa & Doa Series (Pressure)
DOA-706T-AA
ROA-P206T-AA
AF599
2 Gallon Tank Assembly for 48 Frame Piston (Pressure)
1HAB, 2HAH
AF599A
2 Gallon Tank Assembly for 56 Frame Piston (Pressure)
4HCC, 5HCD
AF600
12 Gallon Tank Assembly for 48 Frame Piston (Pressure)
1HAB, 2HAH, 3HBB
AF600B
12 Gallon Tank Assembly for 56 Frame Piston (Pressure)
4HCC, 5HCD, 6HCA
AF601
20 Gallon Tank Assembly for 2 Cylinder 56 Frame Piston (Pressure)
4HCC, 5HCD, 6HCA
AF606
30 Gallon Tank Assembly for 56 Frame Piston (Pressure)
5HCD, 6HCA, 7HDD, 8HDM
AF599H
2 Gallon Tank Assembly for 48 Frame Rotary Vane (Vacuum)
0523
AH318
30 Gallon Tank Assembly for 56 Frame Rotary Vane (Vacuum)
1023 (Oilless & Lube)
AH333
30 Gallon Tank Assembly for “65 Series” Rotary Vane (Vacuum),
Does not include magnetic starter
2565, 2567
AH336
60 Gallon Tank Assembly for “65 Series” Rotary Vane (Vacuum),
Does not include magnetic starter
2565, 6066
AF265
Diaphragm-Type Unloading Pressure Switch 10-100 psi
Range, 20-30 lb Differential
ROA-DOA
AF564
Diaphragm-Type Pressure Switch 10-100 psi Range, 20-30 lb
Differential (No Unloader)
All Simplex Systems
AE265
Diaphragm-Type Vacuum Switch, Cutout 5-25 inHg, Differential 4-12 inHg
All Simplex Systems
AE238
Spring-Loaded Check Valve, 1/4” NPTM Threaded at Both Ends
ROA (Pressure)
0523 (Vacuum)
AJ550
Compression-Type Check Valve, 1/4” NPTM Threaded at Both Ends
DOA, 1HAB-6HCA (Pressure)
AJ550A
Compression-Type Check Valve, 3/8” NPTM Threaded at Ends
7HDD (Pressure)
AJ824
Spring-Loaded Check Valve, 3/8” NPTM Threaded at Both Ends
1023 (Vacuum)
AH326A
Swing Check Valve, 3/4” NPTM Threaded at Both Ends
2565 (Vacuum)
AH326B
Swing Check Valve, 1” NPTM Threaded At Both Ends
6066 (Vacuum)
AK430
Spring-Loaded Check Valve, 3/8” NPTM Hose Connection
(Inside Tank)
4HCC-8HDM
AA806
2” Dial Face Pressure Gauge, 0-160 PSI (0-11 Bar), 1/4” NPTM Mounting
All Simplex
AE362
2” Dial Face Pressure Gauge, 0-100 PSI (0-7 Bar) 1/4” NPTM Bottom Mounting
All Duplex Pressure Systems
AE136
2” Dial Face Vacuum Gauge, 0-30 HG (0-76mm HG) 1/4” NPTM Back Mounting
All Simplex Vacuum Systems
AA640
2” Dial Face Vacuum Gauge, 0-30 HG (0-76mm HG) 1/4” NPTM Bottom Mounting
All Duplex Vacuum Systems
8 Gast Compressed Air and Vacuum Systems
www.gastmfg.com
Accessories
ACCESSORY Drains
Intake Filters
PART NO. D
ESCRIPTION
USED ON
AE248
Manual Drain Cock, 1/4” NPTM
All Systems
AK602
Auto Tank Drain, 1/4” NPT
Pressure Systems
B300A
1/4” NPTM, Plastic with Internal Felts
1HAB-7HDD
B300F
3/8” NPTM, Plastic with Internal Felts
8HDM
AA900D
Jar-Type, 3/4” NPTF Ports
2565
AV460C
Catch Pot with Vacuum Bag Element and Cloth Sack, 1 1/4”
NPTF Ports (Install Before Tank)
6066
V400G
Jar-Type, 3/4” NPTF Ports
0523 (Oilless & Lubricated)
AB599
Jar-Type, 3/8” NPTF Ports
1023 (Oilless & Lubricated)
V425L
Jar-Type, 1/4” NPTF with Deflector in Exhaust Port
0523 (Oilless & Lubricated)
AB599B
Jar-Type, 3/8” NPTF with Deflector in Exhaust Port
1023 (Oilless & Lubricated)
AA900E
Jar-Type, 3/4” NPTF with Deflector in Exhaust Port
AD560B
Jar-Type, 1” NPTF with Deflector in Exhaust Port
2565 Simplex and Duplex
6066
Exhaust Mufflers
Shock
Mounts
AF631
1” Diameter, 3/4” Thickness, 1/4 X 20 Threading 1/2” LongOptional
AF633
1 1/2” Diameter, 1” Thickness, 5/16 X 18 Threading 5/8” Long
All Systems Except ROA and DOA
Hose And Tubing
Bases
Oil and
Solvent
www.gastmfg.com
AE814B
12 1/2” L. Plastic Tubing (Needs AG427 Male Connector)
ROA, DOA
AF634
14” L. Teflon Core, 1/4” NPTM Fittings
1HAB-5HCD
AH332
16” L. Teflon Core, 3/8” NPTM Fittings
6HCA-8HDM
AH325F
16” L. Plastic Tubing (Needs 2-AH138E Clamps)
0523 (Oilless & Lubricated)
AH307C
25 1/2” L. Plastic Tubing (Needs 2-AH138D Clamps)
6066
AB322E
Base For Duplex Vacuum System (Need 2)
6066
AD220
1 Quart High Detergent 10 Weight Lubricating Oil
0523, 1023, 2565
AH255B
14 Ounces of Aerosol Can Nonflammable Flushing Solvent
Vacuum Systems
Gast Compressed Air and Vacuum Systems 9
Technical Data
Compressed Air Systems
Moisture When air is compressed in a tank system, water
accumulates in the tank. To understand how this works, think
of a stack of sponges saturated with water. Exert pressure on
the sponges and water comes out. Compressing volumes of air
has the same effect. The humidity in the air accumulates in the
tank, which will require draining. If you are considering a tank
system for an application that requires moisture-free air, the
design should include a refrigerated, or desiccant type air dryer.
Consult your Gast Distributor for more information.
Air Consumption/Air Delivery Before Pump Cycles This table
shows the cubic feet of air in a tank between various duties.
With this data, you can estimate how many cycles of your
operation can be performed before the pressure switch starts
compressor operation.
CUBIC FEET OF AIR
Pressure
Setting
Tank Size in Gallons
2
12
20
30
0 PSI
.26
1.6
2.6
4
60
8
0-50 PSI
1.1
7.0
11.4
17.6
35.2
0-100 PSI
2
12.4
20.8
31.2
62.4
30-50 PSI
0.3
2.2
3.6
5.5
10.9
80-100 PSI
0.3
2.1
3.6
5.4
10.8
70-100 PSI
0.5
3.2
5.4
8.1
16.2
The following example will assist in sizing a tank package based
on a desired duty cycle.
Application Example:
Determining Duty Cycle (compressor On vs. Off time)
Given: Air requirement is .5 CFM continuous @ 70 psig. Refer
to the above chart and based on the pressure switch setting,
select one of the tank sizes based on the available/stored air.
First choice could be a 20 gallon tank and a .5 HP compressor.
The 4HCC-11T-M450x provides a starting point for you to
consider.
Determining Pump Operating Time:
1.Determine the average flow provided by the compressor
between the cut in and cut out pressure settings for the
pressure switch. (The average pressure for a Simplex tank
package is 85 psig and Duplex tank package is 90 psig).
The flow at 85 psig for model 4HCC compressor is 1.9 CFM.
(For this example .5 CFM is continuously being supplied to
the application). The actual flow going into the receiver will be
corrected to 1.4 CFM (1.9 CFM - .5 CFM = 1.4 CFM).
3.Determine the amount of time the air compressor will
operate to satisfy the pressure switch setting (70 psig - 100
psig). We determined in step #1 the compressor delivers 1.4
CFM into the receiver. The required volume of air of 3.6 cu ft
will return the receiver pressure to 100 psig. The amount of run
time the compressor will operate will be 3.6 cu ft / 1.4 CFM =
2.6 minutes or 2 minutes and 36 seconds.
Conclusion:
The 4HCC-11T-M450X will operate with a Duty Cycle of 27%
Pump run time: 2.6 minutes per cycle or 15.9 min per hour or
2.12 hours (8 hour shift) or 10.6 hours (5 day week, 8 hour shift)
or 551 hours per year. Pump off time: 7.2 minutes per cycle or
1,528 hours per year.
Location of Tank System Regardless of what system your
application requires, its size, and the heat it generates, it is
usually desirable to locate the tank system away from the work
area. Operating noise, even when it is reduced by cycling, can
still be a factor in determining location. However, a remote
installation can cause problems in a pneumatic system. Some of
these may be prevented by following these few simple rules.
1.Be sure the electrical hookup can supply proper voltage and
amperage to the area selected for installation. Don’t run the
system from an extension cord. Do have the system installed
by a trained electrician.
2.Choose a location for the tank system which will be readily
accessible for weekly maintenance, then establish and follow
a regular maintenance schedule. Make copies of all tags and
instructions for a permanent file, then return originals to the
tank so they’re available for quick reference.
3.Use the largest size pipe practical when plumbing the system.
The larger the pipe, the smaller the frictional losses. In other
words, pipe that is too small will restrict air flow and prevent
tools from operating properly regardless of compressor size.
Large pipe also provides capacity for expansion of the system,
should it become necessary.
4.In both vacuum and compressed air systems, the biggest
problem that affects performance is leaks in plumbing. Be sure
to use a sealant when setting up your system and periodically
check all gaskets in filters.
It should be recognized that the performance in this catalog
is based upon ambients at sea level. Changes in altitude
or barometric pressure will affect pumping speed for both
compressors and vacuum pumps.
2.Determine the amount of time the receiver (alone) will
supply the required flow before the pressure switch turns
on the air compressor. We selected a 20-gallon air receiver
and referring to the above chart we can determine that 3.6
cubic feet of air is stored in the receiver between 70 psig - 100
psig. The amount of time the receiver satisfies the continuous
flow of .5 CFM will be 3.6 cu ft / .5 CFM = 7.2 minutes or 7
minutes and 12 seconds.
10 Gast Compressed Air and Vacuum Systems
www.gastmfg.com
Technical Data
Vacuum Forming Work sheet
Sizing a Vacuum Receiver
To understand tank sizing for a desired level of vacuum, it is
important to remember that the volume of the tank vs. the volume
of the mold will determine your system vacuum.
Example: Let’s assume that for each inch of mercury we have
one “super molecule”, and we have a tank that is 1 cubic foot
and a mold that is 1 cubic foot.
At sea level the barometric pressure is 29.92 inHg absolute (0
gauge). Due to variations in the atmospheric pressure, we can
safely assume that 30 inHg is a good round number. So, at sea
level we can say that the atmosphere has almost 30 “super molecules.”
1 cubic foot Mold 30 inHg
absolute pressure
(0 inHg gauge vacuum)
1 cubic foot Tank 10 inHg
absolute pressure
(20 inHg gauge vacuum)
Now, we open up the valve and what happens? It balances
20 "super molecules"
(10 inHg gauge)
20 "super molecules"
(10 inHg gauge)
Now, with an average of 20 molecules per cubic foot, our system
vacuum is 30 - 20 = 10 inHg gauge vacuum.
If we double the size of the vacuum tank, we now have an
average of 10 super molecules in two cubic feet and 30 super
molecules in the one cubic foot mold. So, we have 10 + 10 + 30
= 50 super molecules in 3 total cubic feet, or 17 super molecules
per cubic foot, relating back to our new vacuum gauge reading,
30 - 17 = 13 inHg gauge vacuum.
Now that we understand this concept, here is a simple tank calculation based upon Boyles Law of P1V1 = P2V2. If we have a tank
that we are going to pump down to 25 inHg and we need a total
system vacuum of 20 inHg, we can do the following calculation:
D
T-D
So:
D = 20 inHg
T = 25 inHg
D = Desired Mold Vacuum inHg
T = Tank Vacuum inHg
R = Tank to Mold Ration or Tank Volume: Mold volume (1)
20
= R,
25 - 20
20
5
= R,
4:1 = R
We need a 4:1 ratio between the tank volume and the mold volume. This means if the mold is 1 gallon, the tank must be at least
4 gallons to reach the level of 20 inHg instantaneously.
Other tank to mold volume ratios:
D = 15 inHg
D = 22 inHg
T = 25 inHg
1.5:1 T = 25 inHg
www.gastmfg.com
7.5:1
To set up a proper vacuum forming system we must:
1. Calculate the volume of the cavity(ies) to be evacuated.
2. Calculate the volume of the plumbing.
3. Determine the proper receiver (tank) size.
4. Determine the proper vacuum for the application.
All of these factors are interrelated and demand equal consideration in the final system design. This work sheet is designed to
help you through these considerations in a step-by-step fashion.
The next step is usually easy for a vacuum former because they
know the area of the mold. Some simple reminders for volume
calculations are:
1.Volume is always surface area times depth (height).
2.Volume of squares or rectangles are calculated by multiplying
length times height times width.
3.Surface area of a circle is Pi x radius2 or 3.14 times radius2.
4.Volume of a sphere is calculated by multiplying 4/3 Pi x R3 or in
other words, 4.189 times Radius3.
Cubic Feet for 10-foot Section of Schedule 40 pipe
Pipe Inside
SizeDia. Volume
Pipe Inside
SizeDia. Volume
1/8”
1/4”
3/8”
1/2”
3/4”
1”
1 1/2”
2”
.269
.364
.493
.62
.004 cu ft
.007 cu ft
.013 cu ft
.021 cu ft
.824
1.049
1.610 2.067
.037 cu ft
.06 cu ft
.14 cu ft
.23 cu ft
Reference Dimensions (inches)
Plumbing
Overall
Connection
W
L
Model
Length Height Width Length Width Hole All Female
ROA-P206T
19
18 81043/81/4
DOA-P706T
18
15 81043/81/4
1HAB-11T18
17 81043/81/4
1LAA-11T18
17 81043/81/4
2HAH-11T18
18 81043/81/4
3HEB-11T 2625 1416127/161/4
4HCC-11T3327 1618149/161/4
5HCD-11T3327 1618149/161/4
6HCA-11T3829 1722159/163/8
7HDD-11T3829 1722159/163/8
8HDM-11T3829 1722159/163/8
0523-V
2117 10 10 4 3/8 1/4
1023-V 3930 2222159/161 1/4
2565-V90 4035 2424159/161 1/4
4HCC-89
48
35
38
26 18 1/2 9/16
1/2
5HCD-95
48
35
38
26 18 1/2 9/16
1/2
6HCA-15
48
35
38
26 18 1/2 9/16
1/2
7HDD-69D
48
35
38
26 18 1/2 9/16
1/2
8HDM-30D
48
35
38
26 18 1/2 9/16
1/2
2565-V93
49
36
37
26 18 1/2 9/16
1 1/4
6066-V113
50
48
34
26 18 1/2 9/16
1 1/4
71R640-P64T- 2623 131612
7/16”1/4”
71R640-P67T- 2624 131612
7/16”1/4”
71R640-P65DT- 2623 141612
7/16”1/4”
Gast Compressed Air and Vacuum Systems 11
Gast Manufacturing, Inc.
A Unit of IDEX Corporation
Post Office Box 97
2300 M-139 Highway
Benton Harbor, Michigan 49023-0097
Phone269-926-6171
Fax269-925-8288
www.gastmfg.com
Gast Hong Kong
Room 6, 9/F, New Commerce Centre
19 On Sum Street, Shatin
Hong Kong
Phone852-2690-1008
Fax852-2690-1012
Gast Group Ltd.
A Unit of IDEX Corporation
Unit 11, The I O Centre
Nash Road
Redditch, B98 7AS
United Kingdom
Phone +44 (0)1527-504040
Fax
+44 (0)1527-525262
®Registered
Trademark/™Trademark of Gast Manufacturing Inc.
Copyright ©2012 Gast Manufacturing Inc. All rights reserved.
H-10 (01-12)
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