_a._ This cone should be so constructed that the pump operator can
easily see any water wasting through the relief valve, and its passages
should be of such design and size as to avoid splashing water over into
the pump room.
_b._ The cone must also have a one-inch tapped connection for the
air-vent pipe required by Art. 45, and the arrangement must be such
that the pump operator can easily tell whether water is coming from the
air pipe or is wasting through the relief valve.
_c._ The cone should be piped to some point outside of the pump house
where water can be wasted freely, the waste pipes being as below.
===============+====================
SIZE OF | DIAMETER OF WASTE
PUMP. | PIPE FROM CONE.
---------------+--------------------
500-gallon. | 5 inches.
750 „ | 6 „
1,000 „ | 7 „
1,500 „ | 8 „
---------------+--------------------
The waste pipe can pass down to floor between the yokes at middle
of pump. It should be piped in such a way that steam and gases from
other drains or waste pipes will not work back through it, and, by
being troublesome in the pump room, suggest the covering of the cone
in any way, as it is desirable that the pump operator should always
be able to see instantly any waste from the relief valve or air vent.
This cast-iron cone, connected to the safety valve and air vent, is
included in price of pump, but the waste pipe beyond it is not.