Hydraulic Handbook

Library of Congress Catalog C and Number 65-263 13

Such a method will be described here. However specific speed is only one of the factors considered by the manufacturer when determining the proper impeller diameter. The head at shut-off can be taken as approximately the same as that for water. Velocity head can be defined as the head required. On the other hand, too shallow an irrigation should be avoided to eliminate high evaporation losses.

For instance, the pumping of dirty stock with fibrous and stringy material is best accomplished by use of a closed impeller stock pump with good solid handling ability. Since the head in feet developed by a centrifugal pump is independent of the specific gravity, if the head for a.

The agreement is good provided pump efficiency does not change too much. Would you like to tell us about a lower price? Require normal starting torque for continuous duty.

Conversely, certain substances, such as the chromates and dichromates, may inhibit the corrosive action of many solutions on ferrous metals. This pressure is equal in all directions and exerts itself perpendicularly to any surfaces in contact with the liquid.

Related titlesTools & MediaThe Hydraulic Handbook - The Lee Company

The best results are obtained with water at atmospheric temperature. This will raise the vapor pressure in the tank. No reputable authority will go-on record to endorse friction factors for other than new pipe. The major portion of the head against which many pumps operate is due largely to the friction losses caused by the created flow. Density may also be computed for any liquid as follows.

Handbook of Hydraulics Eighth Edition

Such a series is provided in Fig. Note that as galvanic corrosion is generally understood, it consists of the total corrosion, which comprises the normal t Courtesy H y d r d i c Institute. There are two values of N P S H to consider. If possible, install relatively small replaceable sections of the less noble material at joints, and increase its thickness in such regions.

This value may be used as an estimate of the possible head reduction by the use of a siphon providing a reasonable allowance for friction losses is deducted from it. The following suggestions, based on field experience, are offered as a guide in pump selection and application. The rate of application of water to clay soils must be much slower than for the lighter types, however, since water penetrates such soils slowly. Typical performance curve of a centrifugal pump with constant impeller diameter but varying speeds.

When a liquid flows through the suction line and enters the eye of the pump impeller an increase in velocity takes place. Being a mechanical device and adjustable the gauge must always be calibrated before use.

The Hydraulic Handbook - The Lee Company

Relative roughness is a ratio of the heights of protrusions inside the pipe to the average inside diameter of the pipe, both Epsilon e and D are expressed in inches in the English system. Dredge pipes when water and water sand mixtures are being pumped. Specific gravity and temperature relations of petroleum oils approximate f. The number of irrigations required will depend upon the time of planting, the time of harvest and the occurence of n a t u r a l rainfall. Thus, the cost of two high-speed pumps may not be much greater than that of a single slow-speed pump.

Insulate dissimiliar metals wherever practical, including use of plastic washers and sleeves at flanged joints. Monel metal can be used for brines but not for corn, lima beans or peas where copper may produce darkening. Conversion Table-Brix-Baume-Specific ft. What will be the maximum suction lift permissible?

Amazon Inspire Digital Educational Resources. Increased speeds without proper suction conditions often cause serious trouble from vibration, noise and pitting. Medium loam soils retainzmore moisture than sandy soils so may be irrigated at greater intervals, but with larger amounts. However, in measuring vacuum the gauge line will be empty of liquid and the gauge will be reading the vacuum a t the elevation of the point of attachment of the gauge line t o the pipe line. Velocity required in the piping system depends upon the specific gravity, size, shape, consistency and friability of the material being pumped.

Centrifugal Pumps-Parallel. Corrosion Resistant Alloys. The tkbles show discharge in U.

Handbook of Hydraulics, Eighth Edition, features the latest data and computational modeling techniques and clearly explains cutting-edge methods, processes, and technologies. Flanged fittings should have lower resistance coefficients than screwed fittings. The purpose of irrigation is to supplement natural rainfall and t o supply the requisite amount of water to a cropped soil.

Fully updated hydraulics engineering concepts, methods, and practices. Hydraulic performance and efficiency is secondary although also important. Moore is a Senior Hydraulic Engineer at Stantec. Handbook of Applied Hydrology, antivirus nokia 500 Second Edition. Much of the material in the Hydraulic Handbook has been published previously and is reassembled in this single volume for your convenience.

The work that can be done, therefore, on the suction side of a pump is limited, so N P S H becomes very important to the successful operation of the pump. Among the more important factors affecting the operation of a centrifugal pump are the suction conditions. The manufacturer can supply ratings of their pumps under these adverse conditions. Example Single suction mixed flow or axial flow pump. Experience has shown that where water is plentiful stock is more easily handled in lower percentages.

Technical Hydraulic Handbook (12th Edition)

Maximum shock pressure caused b y water hammer based on instantaneous closure of valves. The speed of the pump should be selected to meet the head.

From the lakes or ponds the water is taken by the sprinkler pump. No allowance has been made for age, differences in diameter resulting from manufacturing tolerances or any abnormal conditions of interior pipe surface. The purpose of all three methods is to supply the pump with liquid a t a pressure above its vapor pressure a t the suction inlet to the pump impeller.

This discussion of N P S H applies to any type of pump whether centrifugal, positive displacement, peripheral, angle or mixed flow or propeller. Shock results from these pulsations when any Iiquid, traveling with a certain velocit'y, is stopped in a short period of time. Gauges are available in most any dial graduation desired, but the units the gauge indicates is not always given on the face of the gauge.

Library of Congress Catalog C and Number 65-263 13