2007 Master Catalog - (Page 5) LIVE CHAT! Click Here Vacuum Pump Selection Guide 2. Vessel Evacuation: In many process applications it is necessary to evacuate a vessel for the purpose of purging gases, leak testing and degassing viscous fluids. It may also be simply the length of tubing between the pump and cup. Knowing the evacuation speed will help determine process completion time or the production rate of a pick and place system. To find the speed, use the evacuation charts listed in the performance data for each venturi. Note that the charts are based on a one cubic foot volume. 1. Determine the total volume to be evacuated – vessel and/or vacuum lines (cu. ft.), 1728 cu. in = 1 cu. ft. 2. Desired vacuum level Hg [mbar] is determined by customer 3. Time to reach vacuum level (seconds) – determined by customer Application Assumptions: Vessel volume: Vacuum line: 2 cu ft 3/8" ID, 3 ft length Application #1 Application #2 Evacuate Vacuum Lines Between Vacuum Cup and Pump Desired Vacuum level: 28"Hg Evacuation time: 10 seconds or less 1. Volume = Area of Tubing ID x Length d2 x L = (.375)2 x 3' = 0.11045 4 4 2. Multiply 0.11045 x length of tubing in inches 0.11045 x 36 = 3.976 cu. in. 3. Convert cu. in. to cu. ft – divide by 1728 3.976 / 1728 = 0.0023cu. ft. (volume of tubing) 4. In evacuation chart – go to vacuum level required 28"Hg = 790.80 seconds per cu. ft. 5. Multiply cu. ft (0.0023 x 790.80) = 1.82 seconds Answer: Depending on the style of pump and options needed, choose from VP Series, J Series, VDF Series or FDF Series pumps – they all have the ability to meet your application requirements. Evacuate Vessel and Vacuum Lines Find Total System Volume Desired Vacuum level: 28"Hg Evacuation time: 5 minutes or less 1. Add vessel volume + tubing volume (Application 1) 2 cu. ft + 0.0023 cu. ft. = 2.0023 cu ft. 2. In evacuation chart – go to vacuum level required 28"Hg – start with smallest pump first until you find the time that meets your requirements. Note, you may have to go to larger pumps 3. Multiply cu. ft (2.0023 x 125) / 60 = 4.17 minutes Answer: Depending on the style of pump and options needed, choose from VP Series, J Series, VDF Series or FDF Series pumps – they all have the ability to meet your application requirements. Model# 60H 90H 100H 150H 0"Hg 0.00 0.00 0.00 0.00 3"Hg 15.00 6.50 2.70 2.30 6"Hg 29.80 12.30 6.50 3.80 Evacuation Time in Seconds Based on 1 Cu. Ft. Volume /"Hg 9"Hg 12"Hg 15"Hg 18"Hg 21"Hg 50.60 74.20 102.80 135.90 183.20 18.90 32.50 47.00 65.40 92.20 11.20 17.50 25.80 38.40 55.40 6.50 10.20 14.10 21.30 44.90 24"Hg 245.90 130.00 79.20 55.00 27"Hg 410.20 222.20 166.70 81.00 28"Hg 790.80 281.30 251.80 125.00 Phone: 1-800-848-8788 or 508-359-7200 E-Mail: engineering@vaccon.com 5 https://www.websitealive5.com/2126/rLogin.asp?groupid=2126&websiteid=0&departmentid=0&sessionid_=36&loginname=&loginemail=&loginquestion=&infocapture_ids=&infocapture_values=&dl http://www.vaccon.com
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