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NSF/ANSI 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 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


 
Stero Co. (The) 
1758 Corporate Circle
Petaluma, CA 94954 
United States 
707-762-0071

Facility : # 2 USA


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 Chemical Sanitizing Door
  SG 20x20  N/A   19.2   85   10   10   [1]
  
[1] Optional tabling and shelving fully complying with NSF Std 2 may be provided.

Single Tank Chemical Sanitizing Door (Dual Sanitizing Mode Machines)
  SD3 20x20  5.1   55.2   38   10   2   [2] [3]
  
[2] Corner model is rated 47.6 gph for hot and 53.5 gph for chemical sanitizing.
[3] Final rinse must contain 50 ppm minimum available chlorine.

Single Tank Door (Dual Sanitizing Mode Machines)
  SD3 20x20  5.1   49.3   38   10   9   [2]
  
[2] Corner model is rated 47.6 gph for hot and 53.5 gph for chemical sanitizing.

Single Tank Door, Chemical Sanitizing, Pumped Fresh Water Rinse[4]
  SUL 20x20  N/A   22   85   12   12   
  
[4] Minimum 50 ppm available chlorine, minimum 120°F.

Single Tank Door, Hot Water Sanitizing, Pumped Fresh Water Rinse
  SUH 20x20  N/A   18.7   85   11   20   


Facility : Lancaster, PA


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 Chemical Sanitizing Door (Dual Sanitizing Mode Machines)
  SD3 20x20  5.1   55.2   38   10   2   [1] [2]
  
[1] Corner model is rated 47.6 gph for hot and 53.5 gph for chemical sanitizing.
[2] Final rinse must contain 50 ppm minimum available chlorine.

Single Tank Door (Dual Sanitizing Mode Machines)
  SD3 20x20  5.1   49.3   38   10   2   [1]
  
[1] Corner model is rated 47.6 gph for hot and 53.5 gph for chemical sanitizing.

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