Elbo 



Centrifugal Pump 

 PVC Nozzle 

 V I.D. Orifice 



Pump Nose 



Nipple ,Powerline 



Rubber Shaft Coupling 



Opening 



Micarto Discs 



Threaded Rod 



-Micarto Discs 



SCALE 



6" 



Figure 3. --Schematic drawing of the collector with the outer casing cut away. 



Construction details of the collector are 

 shown in figure 3. The outer casing is a 24- 

 inch length of 6-inch I.D. polyvinyl chloride 

 (PVC) tubing slotted on top at the front edge 

 to admit the powerline for the motor. A 1/2- 

 inch bronze centrifugal pump (1/2-inch dis- 

 charge, 3/4-inch suction) is bolted to a 

 micarta (1-inch linen phenolic sheet) disc 

 that fits in the front opening of the PVC 

 casing. The impeller in this pump is the 

 semi-open type, which, according to speci- 

 fications, permits pumping a percentage of 

 solids. A capacitor starting, 1/2-horsepower 

 (hp.) A.C. motor (3,450 r.p.m.) is friction 

 mounted in two micarta discs that slide 

 easily into the casing. The motor is an 

 hermatically sealed, water-cooled unit. The 

 pump and motor shafts are connected by a 

 flexible rubber coupling and the entire pump- 

 motor assembly is rigidly aligned by four 

 3/8-inch threaded rods through the micarta 

 discs. The assembly is secured in the casing 

 by tightening another micarta disc against the 

 back edge with a nut on each of the threaded 

 rods. To insure proper cooling of the motor 

 there are a few small slots at the forward 

 edge of the casing and also on the outer edges 

 of the motor mounting discs. The disc against 

 the back edge of the casing has a large central 

 opening. 



The conical nose of the collector is com- 

 posed of a truncated aluminum funnel held 

 against the face of the pump mounting disc 



by a specially machined PVC nozzle screwed 

 into the axial intake of the pump. The funnel 

 is strengthened by a coating of fiberglas 

 and has one small hole to admit water so that 

 it will not collapse under external hydrostatic 

 pressure. The back edge of the funnel is cut 

 away on one side to accommodate the outlet of 

 the pump, A street elbow brazed to the outlet 

 contains a "close" pipe nipple to which the 

 end of the 1-inch I.D. delivery hose is coupled. 



The one vertical and two horizontal stabi- 

 lizers, which are not shown in the drawing of 

 the collector, are made of 1/32-inch sheet 

 stainless steel. 



The lower hose-cable terminal assembly 

 (fig. 4), which serves tobring water, electrical 

 and support elements together inside the 2-inch 

 I.D. hose, is made of standard galvanized pipe 

 fittings. The hose couplings are secured in the 

 ends of the hoses with heavy-duty hose clamps. 

 The heavy steel rod to which the cable is con- 

 nected by a swivel and shackle was specially 

 formed and welded through the center of the 

 pipe plug at the bottom of the assembly. 



The hose and powerline are a few feet 

 longer than the support cable to insure that 

 the latter bears the entire load of the towed 

 unit. The strain exerted by the towed unit 

 should be approximately 800 pounds, the down- 

 ward force that the depressor is designed to 



