30 



AGRICULTURE HANDBOOK 134. U.S. DEPT. OF AGRICULTURE 



Figure 55. 



PN-47.'->l 



Coiling lateral lines for ease of handling. 



Figure 56. — Load of tubing to be taken to evaporator 

 house for cleaning and storage. 



temperatures are favorable to microbial prrowth 

 (yeasts, molds, and bacteria). However, if the 

 sap in the tubing: were sterile, either because of 

 excellent sanitary practices or because of the 

 sterilizing effect of sunlight, no subsequent 

 gi'owth would occur. But this seldom, if ever, 

 happens. Excessive microbial growth usually 

 occurs, especially if higher temperatures follow 



takedown of the tubing. Once gi'owth occurs, it 

 becomes increasingly difficult to clean the tub- 

 ing. Therefore, the tubing should be washed 

 within a few hours after its takedown, and if 

 that is not possible, within 1 or 2 days. Tubing 

 in which microbial gi'owth is excessive must be 

 cleaned by more elaborate methods. 



Etiiiifniiriil 



The following equipment is requii'ed for 

 washing the tubing: 



(1) A tank to hold the hypochlorite solution. 

 This can be a 55-gallon drum or a stock-water- 

 ing tank of approximately 200-gallon capacity. 



(2) A gear-pump that will deliver at least 50 

 gallons per hour at 10 to 15 pounds' pressure. A 

 bypass arrangement on the pump provides flex- 

 ibility of operation. The pump is attached to the 

 drain valve of the tank and is equipped with a 

 15-foot length of hose provided with a tapered 

 nozzle. 



(3) Wash or sanitizing solntioti consisting of a 

 10-percent solution of a commercial liquid 

 bleach (which contains approximately 5 percent 

 of sodium hypochlorite); 20 gallons should be 

 used with 180 gallons of water. 



ii) Rubber gloves to protect the hands against 

 the caustic action of the sanitizing solution. 



