=============+=================+=================
Size of Pipe |Gallons per Hour.|Gallons per Hour.
Connections. | Maximum. | Minimum.
-------------+-----------------+-----------------
3/8 inch. | 85 | 50
1/2 „ | 165 | 75
3/4 „ | 350 | 130
1 „ | 580 | 325
1-1/4 „ | 900 | 425
1-1/2 „ | 1750 | 750
2 „ | 2850 | 1150
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The figure below shows how the connections or piping should be made in
attaching the Manhattan and Peerless injectors.
The dotted lines indicating pipe and fittings in connection with the
suction represent the way the water supply is to be received from a
tank located above the level of the injector.
[Illustration: FIG. 519.]
The makers of these two instruments have kindly furnished the following
general rules to govern their connection with steam supply:
1. _Place injector in a horizontal position._ (See illustrations 512
and 514.) The flap nozzle must in all cases open upward in direction of
air valve. In taking injectors apart be careful to replace it in that
position.
2. _Take steam from the highest part of boiler_; never connect to pipes
furnishing steam for other purposes.
3. _Have all joints perfectly tight_, especially the suction pipe, as
no injector will lift water unless atmospheric air is excluded.
4. _Have all pipes thoroughly cleaned_ from red or white lead and scale
before the injector is connected; it will save trouble afterwards.
5. _All pipes must be of the same or larger diameter_ than the
corresponding parts of injector.
6. _Avoid all short bends_, and have all pipes as short and straight as
practicable.
7. _Use a strainer at the end_ of suction pipe; the holes in the
strainer should be small, but _their total area larger_ than the area
of the supply pipe.
8. _Insert stop valves in suction, steam and delivery pipes_, to
facilitate disconnection in cleaning injector and check valve in
delivery pipe.
[Illustration: FIGS. 520-533.]