_a._ Water and steam pipe connections must have standard flanges to
connect with pipes of the sizes given below.
=============+==============+===============+========+========
Size of Pump.| Diameter of | Diameter | Steam | Exhaust
Gal. Per Min.| Suction Pipe.|Discharge Pipe.| Pipe. | Pipe.
| Inches. | Inches. | |
-------------+--------------+---------------+--------+--------
500 | 8 | 6 | 3 | 4
750 | 10 | 7 or 8[C] | 3-1/2 | 4
1,000 | 12 | 8 | 4 | 5
1,500 | 14 | 10 | 5 | 6
-------------+--------------+---------------+--------+--------
[Footnote C: Eight-inch preferred, this being the more common size for
valves, fittings, and pipes.
These suction pipe sizes, although larger than common for trade pumps
of the same size, are believed to be amply justified by experience, and
exert a powerful influence toward enabling the pump to run smoothly at
high speed with water cylinders filling perfectly at each stroke. No
defect is more common than restricted suction pipes.]
_b._ A single suction entrance at the end of the pump is to be provided
unless otherwise specified by the purchaser.
Some situations render desirable side suction entrances, for
permitting drafting water from two different sources of supply. These
additional openings are to be considered as extras. Ordinarily, the
purchaser can provide for such situations by proper piping at the
single end suction entrance.
If there is to be but one suction opening on casting, this had best
be at center, for the reason that, if suction pipe ever gets to
leaking air, this air stands a better chance of being distributed
equally to the two plungers, and has less tendency to make the pump
run unevenly.
_c._ Standard flanges and standard bolt layouts as adopted by the
Master Steam Fitters, July 18, 1894, must be used on all the above pipe
connections, as per table given below.