Without getting into an explanation of friction loss of your ten foot, one inch diameter pressure hose, you will require 33.5 psi at the pump to provide the 30 psi at the eductor. All Proline dredge/high-banker combos are popular with prospectors who are looking for maximum versatility in a well-built proven design. Refer to a conversion chart to find conversion of decimal inched to 'regular' inches which is fractionally larger than 1/2'.Īt 30 psi the 1/2' eductor will require 41 g.p.m. 264 IMPORTANT: this is the radius of the eductor size - NOT the bore size! When other 2.5' dredges were floating on inner-tubes, required a suction nozzle for producing dredge vacuum, and had limited depth capabilities, the Proline 2. Now for the tricky part: convert backwards and finally come up with a bore diameter.Įductor size is. This machine was a trend setter when it first came on the market and it continues to be one of our best sellers many years later. In our opinion he makes the best nozzles on the market. inchesĮxample: 2 inch jet Ģ inch jet = 3.14 x (1' (radius of jet) Squared)ģ.14 sq inches x 7% (.07) =. Stainless Steel Straight Twin Jet Water Dredge and swivel suction nozzle Diving Equipment Specialtiesbuilds stainless steel water dredges for underwater digging and sells complete, turn-key underwater dredging systems for both private and commercial use. Here we have the Dryland dredge nozzle made by Sam in America.

Jet nozzle design for dredges