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NSF/ANSI STANDARD 3
Commercial Warewashing Equipment

Racks per Hour / Dishes per Hour / Water Consumption Calculations

For informational purposes, the estimated racks per hour or dishes per hour for NSF/ANSI Standard 3 Certified dishwashers can be calculated as follows:

Racks per Hour for Stationary Rack Dishwashers = 3600(NR) / TC

Racks per Hour for Rack Conveyor Dishwashers = (CS)(60) / RL

Dishes per Hour for Rackless Conveyor Dishwashers = (120)(CS)(CW) / PD

Water Consumption (gallons per hour) for Stationary Rack Dishwashers = (GPC)(RPH)

Water Consumption (gallons per hour) for Conveyor Dishwashers = (GPM)(60)

Where: CS = Conveyor speed measured in feet per minute
              CW = Conveyor width measured in inches
              GPC = Gallons per cycle
              GPM = Gallons per minute
              NR = Number of racks the dishwasher is designed to hold per cycle
              PD = Distance between pegs measured in inches, center to center of the peg, in the direction of conveyor travel
              RL = Length of the rack measured in feet
              RPH = Racks per hour
              TC = Total cycle time measured in seconds

The total cycle time includes wash, rinse, dwell, and load times. Load times will vary depending on the type of dishwasher. Estimated load times commonly used for specific types of dishwashers are as follows:
door type (straight thru) - 5 seconds
door type (corner) - 7 seconds
hood type - 8 seconds
front opening type - 30 seconds


 
Auto-Chlor System, Inc. 
746 Poplar Avenue
Memphis, TN 38105 
United States 
901-579-2300
Visit this company's website

Facility : Memphis, TN


STATIONARY RACK DISHWASHING MACHINES
      Final Rinse    
      (20 psi) Operating Time  
  Model Rack Size Flow Usage (seconds) Footnotes
  Number Width gpm gph Wash Rinse Dwell  

Single Tank Door Chemical Sanitizing
  U34PT-10 20x20  N/A   41.3   56   24   10   [1] [2] [4] [7] [8]
  A4 20x20  N/A   41.3   56   24   10   [1] [2] [4] [7] [9]
  A5 20x20  N/A   40.5   56   24   10   [1] [2] [4] [7] [9]
  A4IW 20x20  N/A   41.3   56   24   10   [1] [2] [4] [7] [9]
  A5IW 20x20  N/A   40.5   56   24   10   [1] [2] [4] [7] [9]
  M4 20x20  N/A   41.3   56   24   10   [1] [2] [4] [7]
  U38 20x20  N/A   32.7   56   24   10   [1] [2] [4] [7]
  U34 20x20  N/A   32.7   56   24   10   [1] [2] [4] [7]
  
[1] Recirculated pumped rinse minimum 50 ppm available chlorine.
[2] Total water demands 1.09 gal. per complete wash, rinse cycle at 120°F.
[4] Unit also accepted with shorter time cycle in which the following would apply:
    Dwell - 10 sec.
    Final rinse usage: 54.3 gal/hr @ 130°F
    Rinse - 17 sec.       
    Wash  - 45 sec.
[7] Unit also accepted with shorter time cycle in which the following would apply:
    Dwell - 10 sec.
    Final rinse usage: 64.9 gal/hr @ 130°F
    Rinse - 15 sec.
    Wash  - 35 sec.
[8] Also acceptable with or without draintables.
[9] With or without suffix V to indicate a ventless system.

Single Tank Door Double Rack Chemical Sanitizing
  D2 2*20x20  N/A   74.3   56   24   10   [1] [3] [5] [6] [9]
  D2CL 2*20x20  N/A   72.7   56   24   10   [1] [3] [5] [6] [9]
  D2CR 2*20x20  N/A   72.7   56   24   10   [1] [3] [5] [6] [9]
  
[1] Recirculated pumped rinse minimum 50 ppm available chlorine.
[3] Total water demands 1.96 gal. per complete wash.
[5] Unit also accepted with shorter time cycle in which the following would apply:
    Dwell - 13 sec.
    Final rinse usage: 141 gal/hr @ 130°F
    Rinse - 21 sec.
    Wash  - 56 sec.
[6] Unit also accepted with shorter time cycle in which the following would apply:
    Dwell - 12 sec.
    Final rinse usage: 167 gal/hr @ 130°F
    Rinse - 15 sec.
    Wash  - 45 sec.
[9] With or without suffix V to indicate a ventless system.


 
Auto-Chlor System, Inc. 
746 Poplar Avenue
Memphis, TN 38120 
United States 
901-684-0600
Visit this company's website

Facility : Edwardsville, KS


CONVEYOR DISHWASHING MACHINES
      Final Rinse    
      (20 psi) Conveyor Speed  
  Model Conveyor Flow Usage (Max.) Footnotes
  Number Width gpm gph (ft/min.)  

Multiple Tank Rack Conveyor Dishwasher - Chemical Sanitizing
  AC-44 20"  2   120   6.8   [1]
  AC-44-RC 20"  2   120   6.8   [1]
  AC-66 20"  2   120   6.8   [1]
  
[1] Unit accepted when operated as a chemical sanitizing dishwasher provided it is installed
    with a Beta Technology Model H9200SR or H9300S chemical sanitizer feeder.

Multiple Tank Rack Conveyor Dishwasher - Hot Water Sanitizing
  AC-44 20"  2   120   6.8   
  AC-44-RC 20"  2   120   6.8   
  AC-66 20"  2   120   6.8   

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