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- #Water jet ejector design calculation pdf
- #Water jet ejector design calculation install
- #Water jet ejector design calculation professional
In all cases, the correct unit is the one that matches your desired range of motive-to-suction flows the closest. As a general rule in dilution applications, the HL is the best unit to choose. In this case, the motive flow should be matched to the desired motive flow and the suction port should be throttled to achieve the desired dilution rate. In other applications, such as the dilution of chemicals, the motive flow should be as high as possible: while the suction flow will be low. This is generally true for pumping applications. In some cases, the unit chosen will have the greatest suction flow while consuming as little motive fluid as possible. (*** Turndown Ratio = max suction flow minus suction flow divided by max suction flow desired) If a turndown ratio*** of greater than 35% is needed, then choose two or more eductors that have the correct turndown ratio and operate these units in parallel. Step 5 Select the unit from Steps 1-4 that best meets the motive and suction parameters of the specific application. Do this for each of the models of eductors. Step 4 Calculate the amount of motive flow used by multiplying the Qm and Qs found in the tables by the Tabulated S.F. If an exact match is desired, consult with us. equal to or greater than the Desired S.F. If a standard unit is being used, pick the size unit that has a Tabulated S.F. = Desired Suction Flow ÷ Tabulated Suction Flow To determine the size of eductor needed, first use the following formula to determine the Desired Sizing Factor (S.E) Do this for each of the models.ĭesired S.F. The flow specified represents the Tabulated Suction Flow for each of the different models of eductors.
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Step 3 Find the motive pressure (Pm) Locate the motive pressure from the table that is closest to or lower than your actual motive pressure. (** Outlet Head = vertical distance, F, from the outlet connection to the surface or the outlet liquid destination. (Be certain that friction losses in the outlet line are calculated using the combined rate of both the motive and the suction flows.) It is important that the outlet line from the eductor be as large or larger than the outlet connection. It Is important to include friction losses into the desired outlet head. Step 2 Find the outlet head** (Ho) equal to or greater than your actual outlet head. (* Suction lift = vertical distance, Ft, from the suction connection to the surface of the suction liquid source. Using the NPSH number will correct for temperature variations and friction losses, resulting in a more accurate value. You can also or use the calculated result from the NPSH formula found on page 5 of this manual. If your lift is between two of the lifts on the table, use an average of the two. Step 1 Find the suction lift* or head (Hs) that is equal to or greater than your desired lift. (NOTE: All JRG/JT tables use the 1-1/2 inch unit as the standard, and eductors are sized using a Sizing Factor (S.E.) based on this standard unit.)
#Water jet ejector design calculation pdf
To determine the correct eductor for a specific application, follow the steps in this section, using the (tables open in a PDF format in a new window/tab) provided to achieve your desired results.
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#Water jet ejector design calculation professional
Professional and experienced suppliers are called upon to furnish proven and warranted products. This is not done in conventional engineering circles. It is obvious that someone (you or your supervisors) will have to take the risk and gamble of seeing to it that your design works as per specified needs. What you are proposing is not the conventional case since you yourself admit you know little or nothing of designing such a unit.
#Water jet ejector design calculation install
With proven designs available, why would you feel pressed to design, test, modify, and install your own personal design? Are you limited in being able to buy an existing, proven & warranted design? This is understandable, since a lot of the technology is locked up by the existing manufacturers who have spent a lot of time and money in developing their designs. I've only heard of two instances where an engineer took to designing and building his own ejector.