(5) Give Distance of Water supply horizontally from injector, and size and description of suction line.

(6) What is the average and maximum Temperature of the feed water? .

(7) How many injectors are required? Is each one to be of sufficient size to supply the whole battery, or otherwise?

(8) Are Connections to be supplied screwed, flanged or blank (for brazed copper connection)?

(9) State whether any of the following Fittings are also to be furnished.

Steam valve, suction valve, strainer, check valve, discharge valve, overflow funnel, water pressure balanced valve (for suction line subject to irregular high pressure), dirt stop (strainer fitting for suction line).

EJECTORS

Ejectors (or Exhausters) are most commonly used for elevating water or other liquids, and for exhausting or priming pumps, etc. Their use has in recent years, however, been extended to cover almost any of the operations of ordinary pumps, air compressors, vacuum pumps, and heaters. The information necessary to submit to the makers, for obtaining quotations for the more usual operations, is outlined below. The more complicated or unusual cases should be handled by an engineer, who should submit all pertinent information to the manufacturing specialists.

(1) Describe the use to which the ejector will be put.

(2) Describe the nature of the liquid; its specific gravity or weight per cubie foot (if other than water); and its temperature.

(3) What will be the minimum and average steam pressures at the ejector? If there is doubt about the sufficiency of steam available, state conditions and ask for builder's opinion.

(4) (For Lifting Liquids.) Will the ejector be of the "Forcing" type (placed within about 5 ft. of the water level); or of the "Lifting" type (placed as high as the steam pressure and the temperature of the liquid will allow)? In either case, state how high (vertically) above the water level the ejector will be placed, and the total height (vertically) to which the liquid has to be raised. (5) (For Lifting Liquids). If the suction consists of piping, describe same, giving size of pipe, number of bends, etc. Also, describe discharge line in the same

manner.

(6) (For Priming Pumps). Give all the information called for above, and state size of pump and the approximate time in which it is desired to prime it. (7) (For Lifting Liquids). How many gallons per hour are to be raised? (8) How many units are required? Is each one to be of sufficient size for the above work, or otherwise?

(9) Is a strainer required?

Special Uses

Information to be given in addition to the above.

(10) For Driven Well Service. State flow of well (capacity of ejector must not be greater than this). State size of casing (I. D.); depth of casing; depth to water level when not running; depth to water level when being pumped. (11) For Sand or Mud Eduction. Send sketch of the situation. Will steam or water be used for lifting?

(12) For Lifting Corrosive Liquids. For this purpose, ejectors of lead, stoneware, C. I., etc., may be used as best suited. Describe the character and strength of the liquid. State whether steam or air is to be used for lifting? (13) Water-jet Eductors. These are used for draining sumps, etc., with the aid of water from ordinary or special pressure mains. Send a sketch of the conditions and give the water pressure available. A check valve may be installed in the suction. The eductor may be made automatic in action by means of a float device.

CHAIN DRIVE MATERIAL

(For ordering sprockets and chain for a power transmission.)

(1) Submit sketch showing: relative position of shafts, driving and driven sprockets designated, direction of rotation, distance between centres of shafts.

(2) What is the horse-power to be transmitted?

(3) Service which drive is to perform?

(4) Is load steady, pulsating, or irregular? Is drive started or stopped suddenly? (5) Will drive run under dirty conditions? Describe same.

(6) Diameter and speed of driving shaft?

(7) Diameter and speed of driven shaft?

(8) Can distance between shafts be adjusted? How much?

(9) If drive is to replace leather or rubber belts, give diameter of pulleys, and width and thickness of belt; also, if drive is other than straight, describe by sketch.

(10) State which of the following items are to be supplied, and which are not to be supplied; driving sprocket with key and set-screw, driven sprocket with key and set-screw, chain, take-up, idler pulley or sprocket with shaft and bearings, oil-guard complete with supports (see sketch), spare links and pins, repair links, repair block.

SPROCKET WHEELS

(1) Give number of chain sprocket is to work with.

(2) Give number of teeth, or give approximate (pitch) diameter required.

(3) State whether it is a driven or driving sprocket.

(4) Give exact size of bore, and state whether it is to be key-seated or set-screwed. Note. When size of key-seat is not given, maker's standard is supplied.

(5) When wheels have clutch hubs, or hubs on one side only, state whether it is to be on the right or left-hand side as top of wheels turn from you.

(6) If a number of sprockets are required, submit the above information in a table made out as follows:

For an outline for an engineer's design of a spiral-conveyor installation, see p. 72.

(1) Is a solid-scroll, ribbon, cut-flight, double flight, mixer-paddle, or other type of spiral required?

(2) Give diameter of scroll.

(3) Is scroll to be right-hand, or left, or both?

If in doubt, send sketch showing direction of travel of material and required direction of rotation.

(4) Give length of conveyor required, over-all of inlet and discharge spouts, or inside-to-inside of end-heads.

(5) Of what material is scroll to be made, steel plate, extra heavy steel plate, or cast iron?

(6) Of what material is trough to be made, steel plate, wood with curved steel lining, or special?

(7) Are scroll or trough to be galvanized?

(8) Is trough to be of standard size, or extra large? If the latter, describe requirements.

(9) Will the driving belt operate the conveyor direct, or through a spur gear reduction, or will a bevel-gear arrangement be used?

(10) Give size and speed of driving shaft.

(11) At about what speed is scroll to operate?

(12) State which of the following items are to be furnished and which are not to be furnished:

Scrolls (including hangers and couplings), trough or trough lining, end bearings, end driving gearing complete, pulley, driving chain or belt, driving sprocket or pulley (for line-shaft).

BELT, SLAT OR SCRAPER CONVEYORS

For an outline for an engineer's design, see p. 71.

(1) Length of Conveyor, c. to c. of end pulleys?

(2) Is conveyor to be level or inclined, or partly level and partly inclined? Send a sketch showing the slope, length, etc.

(3) State the material to be handled.

largest and smallest sizes of pieces.

Give weight per cubic foot, and average,

(4) Is the material wet or dry, hot or cold? Give temperature. Does it possess destructive properties, chemical or physical?

(5) Give average quantity of material to be moved per hour in pounds, bushels or cubic yards.

(6) Give maximum capacity per hour and explain the governing conditions. (7) In what manner is material to be fed to the conveyor; by hand or by dredges, bins, chutes, crushers, rolls, etc.?

(8) To what will the conveyor deliver? and how? If at intermediate points, give number of delivery points and state whether they are to be fixed or movable.

(9) From which end will the conveyor be driven? If advisable, would it be possible to drive from other end?

(10) Is the conveyor to be operated from engine, motor or line-shaft?

(11) If to be operated by an existing engine, give size of cylinder, speed, steam pressure and size of pulley.

(12) If to be operated by an existing motor, give horsepower, and size and speed of pulley.

(13) If to be operated from line-shaft, give speed and diameter of shaft.

(14) Of what material is the supporting framework of the conveyor to be made, steel or wood?

(15) Specify which of the following items are to be supplied by the contractor, and

which are not to be supplied: All special material entering into the construction of the conveyor proper; the supporting framework complete or the irons only for the supporting framework; the transmission material for the driving end of the conveyor; driving belts; the driving engine; motor pulley; house over the whole.

BUCKET ELEVATORS, ETC.

(1) State nature of material to be handled.

(2) Quantity in pounds or bushels or cubic feet per hour.

(3) Height material is to be elevated, and whether perpendicular or at what incline. (4) Speed and diameter of shaft from which power to drive elevator is taken. (5) State whether elevator can be driven more conveniently from top or bottom. (6) If chain belting is to replace rubber or cotton belts, give inside measurements of old leg, width of belt to be replaced, and diameter of head and foot pulleys. (7) Is the elevator to be of all-metal construction, or is the leg to be of wood? (8) Which of the following items are to be supplied and which are not to be supplied? Main chain, chains or belt; buckets; boot with take-up, shaft and sprocket, etc.; head with shaft and sprocket (or pulley); leg complete (of wood or steel, or irons only for wood); driving gear complete; driving belt or chain; belt or sprocket for line-shaft.

LEATHER BELTING

For an outline of a specification which may be used when purchasing leather belting, see p. 128. The following notes give supplementary information concerning this material and also outline the data to be submitted in case it is not desired to write a formal specification.

(1) Style.

Leather belting is prepared in various forms, the principal of which are oaktanned, chrome-tanned, waterproofed (dipped in a waterproofing compound after making up), waterproof (made up with waterproof cement, etc.). Prices differ very widely, not only with the grade of leather used but also with the method of composition.

(2) Thickness.

Thicknesses are usually designated as "single," "double" and "triple." A more extended division is also in use and should preferably be adopted in ordering, such as "ordinary single" or "light single," "heavy single," "ordinary double" or "light double," "heavy double," "light triple" and "heavy triple;" the grades merge into one another, but permit of a more definite description of the weight of belt needed. In case large, triple belts are required, however, it is best to calculate the thickness required and so specify. (3) Order List. State:

(g) Whether any of the belts are to be endless (send sketch of drive).
(h) Whether material is to be packed for export.

CANVAS BELTING

Under this term is included all that class of belts having woven-cotton or canvas as a base.

For a specification-form which may be followed in case it is desired to present same, see p. 128.

(1) Style.

State whether woven canvas, stitched canvas, rubber-canvas, treated cotton fabric, "Balata," etc., is required.

(2) Thickness.

The thickness of canvas belts is usually given as "4-ply," "5-ply," etc., according to the number of layers of canvas used, but the thickness and quality of the latter are variable quantities, so that the term is not a sufficient unit for comparisons.

The weight required may be specified in three ways: (1) by giving the thickness of the equivalent leather belt, (2) by stating the ply (when the make to be used is decided upon), and (3) by stating the belt-speed and horse-power to be transmitted. The first method is quite generally used and is probably good enough for most purposes if the bidders are required to state the ply of the belts proposed; follow the six-division classification for leather belts given on p. 185, (2).

(e) Material for making (—

−) joints in (- −) in. belt (give list).
(f) Whether any of the belts are to be endless (send sketch of drive).
(g) Whether material is to be packed for export.

HACK SAW BLADES

Quite usually hack saw blades are ordered with no indication being given as to the class of work they are intended for. Blades vary not only in the number of teeth per inch, but in the temper given them; and for cutting different materials, such as soft steel, cast iron, brass, tubing, etc., a different type of saw should be used. To avoid possible dissatisfaction on this account, the information outlined below should be given the dealer or manufacturer.

(1) Number of blades required.

(2) For hand or machine use.

(3) Length.

(4) Number of teeth per inch (if definitely known).

(5) Material to be cut.

In absence of specifications as to cut of tooth, always ascertain, if possible,
what class of material is to be cut with the blades ordered, and furnish a
"Regular" tooth for solids in soft steel, a

"Medium" tooth for hard tool steel, cast iron and general work, or where the