User Guide

Plumbing Design Assistance Manual l Chapter 6 – Installation methods l 81
Public-use xtures
Water hammer is probably the
most signicant concern when
piping for public-use xtures.
In typical installations with
metallic piping where back-to-
back restrooms are separated
by a mechanical chase, the
supply header is usually kept
at roughly the same height as
the xture supply. This creates
sharp, abrupt paths for the
water, resulting in pressure
surges (water hammer) when
a fast-actuating valve closes.
To compensate, most local
codes require water hammer
arrestors.
The exibility of Uponor
AquaPEX piping combined
with its ability to withstand
high surge pressures makes
it the perfect product for
supplying public-use xtures.
PEX has an approximate
modulus of elasticity of
91,350 psi, compared to
copper’s 16,000,000 psi.
Refer to Chapter 5 for more
information about expansion
and contraction.
Because Uponor requires a
minimum distance between
ProPEX ttings (see Table
2-1), take care when creating
a xture header. In typical
installations using Uponor
AquaPEX, the PEX header is
elevated to allow for adequate
spacing between ProPEX tees
and to also offer ample room
for AquaPEX pipe drops to the
xture (see Figure 6-42).
Pipe labels
If pipe labels are required to
be afxed to Uponor AquaPEX
pipe, Uponor approves the
use of permanent, exible,
vinyl stickers with pressure-
sensitive acrylic. Consult local
code for proper placement and
requirements regarding pipe
labeling.
Water hammer arrestor where required by code
(exact locations vary by manufacturer)
Isolation ball valve (typical)
Bend support
(½" to ¾" typical)
Vent
pipe
Waste
pipe
Urinal carrier behind
Copper stub
Uponor AquaPEX pipe
header (size varies)
Stud wall assembly
Uponor ProPEX EP tee
Support
Uponor AquaPEX pipe
supply (size varies)
Copper carrier bracket
Water closet carrier
Commercial ush bank detail
Figure 6-42: Fixture bank elevation view
Figure 6-41: Fixture bank section view
Wall assembly
Uponor AquaPEX pipe
header (size varies)
Support
Uponor AquaPEX pipe
supply (size varies)
Vent pipe
Uponor ProPEX LF
brass sweat adapter
Copper stub
Copper carrier bracket
Water closet carrier