=======+===========+===========+===========+============+==========
| | | | |Capacity
| Discharge | Suction | Steam | Steam jet |per Hour,
Size | Pipe | Pipe | Pipe | Diameter |in Gallons
-------+-----------+-----------+-----------+------------+----------
No. 1 | 1/2 in. | 3/4 in. | 3/8 in. | 11/100 in. | 300
„ 2 | 3/4 „ | 1 „ | 3/8 „ | 15/100 „ | 500
„ 3 | 1 „ | 1-1/4 „ | 1/2 „ | 20/100 „ | 750
„ 4 | 1-1/4 „ | 1-1/2 „ | 1/2 „ | 25/100 „ | 1,200
„ 5 | 1-1/2 „ | 2 „ | 3/4 „ | 30/100 „ | 1,700
„ 6 | 2 „ | 2-1/2 „ | 3/4 „ | 40/100 „ | 3,000
„ 7 | 2-1/2 „ | 3 „ | 1 „ | 50/100 „ | 5,000
„ 8 | 3 „ | 4 „ | 1 „ | 60/100 „ | 7,500
„ 9 | 4 „ | 5 „ | 1-1/4 „ | 80/100 „ | 10,000
„ 10 | 5 „ | 6 „ | 1-1/2 „ | 1 „ | 14,000
-------+-----------+-----------+-----------+------------+----------
[Illustration: FIGS. 540 and 541.]
The accompanying Figs. 540 and 541 represent an ejector with a foot
strainer. The table, page 259, gives an idea of its pipe sizes and
capacities.
_Application of ejectors._ The Fig. 536, page 256, shows two ejectors
applied in different ways. One is mounted _to lift and force water_,
and the other _to force only_; the latter is submerged in the water
to be elevated, and placed in a vertical position to reduce the
condensation of operating steam to a minimum. In both of these examples
of the use of the device it will be noted a strainer is attached to the
suction pipe. The arrows show the direction of the flow of both the
steam and water.
Certain ejectors will not work well when the steam pressure is too
high. In order to work at all the steam must condense as it flows
into the combining tube. Therefore, when the steam pressure is too
high, and the heat is very great, it is difficult to effect complete
condensation; so that for high pressure steam good results can only be
obtained with cool water. It would be well when the feed water is too
warm to permit the ejector to work right, to reduce the pressure, and
consequently the temperature of the steam supply, as low pressure steam
condenses quickly, and therefore can be employed with better results
than high pressure steam.
NOTE.—This instrument is marketed as “Van Duzen’s steam jet pump”
(Cincinnati, Ohio), and credit should be given the makers for the
useful table on page 259.
_For high elevations_ and high temperature of liquids, ejectors should
be submerged from three to six feet; the suction pipe should always be
provided with a strainer and the makers of the instruments recommend
the placing of a check valve in the force pipe to facilitate the
cleaning of the suction pipe by steam, when made necessary through the
raising of impure substances.
_To start the ejector_ open the steam valve slowly until the suction
works satisfactorily, _when full amount of steam should be quickly
admitted_.
[Illustration: FIG. 542.]
[Illustration: FIG. 543.]
[Illustration: FIG. 544.]
_A double tube ejector_ is represented in Fig. 542. This is calculated
to use steam economically by reason of its having two tubes, besides
it is well made and properly proportioned to raise water to high
elevations.
Fig. 543 is a cheaper form of apparatus and is designed to elevate
water to very moderate heights and where a saving of steam is not of so
much consequence as in localities where the price of coal is high.
_The jet pump_ presented in Fig. 544 is another compact form of this
style of ejector and is adapted for its own particular class of work
which is but little known to those unaccustomed to use these appliances.
When working either an injector or ejector from a long lift or with
a long pull through horizontal piping, it takes several minutes to
exhaust the air from the pipe when steam is turned on, resulting in a
considerable waste of steam each time the injector is started. This
waste can be done away with by the use of a foot valve.
[Illustration: FIG. 545.]
[Illustration: FIG. 546.]
[Illustration: FIG. 547.]
_Universal double-tube injector_ (original Korting injector). This
instrument is the combination of two jets (see Figs. 545 and 546);
it is proportioned for extreme temperature and for quick and strong
action, which includes maximum high suction. _The discharge is into
the upper jet_, where the water receives the additional strong impulse
to carry it into the boiler. _The pressure and volume from the lower
jet corresponds to the steam pressure_, and this is as it should be to
answer the requirements of the upper or forcing jet. The varying volume
insures the proper working at high steam pressure as well as at low,
and an increased pressure admits of increased high temperature.
The action of the injector is thus explained; its favorable operation
is due to the double-tube principle; the pieces composing the Korting
injector are shown in the numbered cuts, page 263, and _the names of
the parts_ are given below.
_Number and name of piece._ 1, Body; 2, handle lever; 3, side rods;
4, connecting fork; 5, cross head for shaft; 6, nuts for cross head;
7, starting shaft; 8, nuts; 9, yoke bar; 10, lower steam valve;
11, upper steam valve; 12, lower steam nozzle; 13, upper steam
nozzle; 14, lower water nozzle; 15, upper water nozzle; 16, front
body caps; 17, side body caps; 18, overflow nozzle; 19, check valve
compressor; 20, overflow valve compressor; 21, stuffing-box; 22,
fol. for stuffing-box; 23, nuts for stuffing-box; 24, cross head for
overflow; 25, links for overflow; 26, pin for links; 27, screws; 28,
bell cranks; 29, coupling nuts; 30, pipe unions; 31, spanner wrench;
32, sokt. nozzle wrench; 33, un. for cop. pipe.—Regulator complete
replaces pieces 10 and 16.