pipe is used as the supply line. It consists of a
length of copper pipe with fittings wiped or
soldered on each end. Another flexible connector
is the swing joint type commonly used with
galvanized iron or steel service lines. (See fig. 7-6.)
This connection consists of two elbows separated
by a short section of pipe or a nipple. Next is the
expansion loop (fig. 7-7) used when copper tub-
ing is used as the service line.
A curb stop must be provided in every service
line to conform to the National Standard
Plumbing Code, paragraph 10.12.1. (See fig. 7-8.)
The curb stop provides an accessible shutoff of
the water supply to the building.
Next, a stop and waste valve (fig. 7-9) will be
installed to conform to the National Standard
Plumbing Code, paragraph 10.12.2. This valve
Figure 7-6.Typical swing joint.
Figure 7-7.Expansion loop.
is used to drain the building water system. It must
be installed at a point where drainage by gravity
can be achieved. When the valve is turned off,
drainage will occur through a drilled passage in
the valve body.
Finally, a meter stop is installed when a water
meter is to be included in the service line (fig.
7-10). It is installed on the pressure side of the
meter and can be used for convenient securing of
the water supply to the building. Where no meter
is used, a simple gate valve may be provided for
convenient use when repairing or maintaining the
building water lines.
Each fixture to be installed requires a fixture
stop valve and a certain size branch and riser
piping. Branch lines are calculated in the same
fashion as service supply lines. Risers for each
Figure 7-8.Curb stop.
Figure 7-9.Stop and waste valve.