6.3 — Conduits and pipes embedded in
6.3.1 — Conduits, pipes, and sleeves of any material
not harmful to concrete and within limitations of 6.3
shall be permitted to be embedded in concrete with
approval of the engineer, provided they are not considered
to replace structurally the displaced concrete,
except as provided in 6.3.6.
6.3.2 — Conduits and pipes of aluminum shall not be
embedded in structural concrete unless effectively
coated or covered to prevent aluminum-concrete reaction
or electrolytic action between aluminum and steel.
intervals between the various operations;
(e) Any other loading or condition that affects the safety
or serviceability of the structure during construction.
For multistory construction, the strength of the concrete
during the various stages of construction should be substantiated
by field-cured test specimens or other approved
R6.3 — Conduits and pipes embedded in
R6.3.1 — Conduits, pipes, and sleeves not harmful to concrete
can be embedded within the concrete, but the work
should be done in such a manner that the structure will not
be endangered. Empirical rules are given in 6.3 for safe
installations under common conditions; for other than common
conditions, special designs should be made. Many general
building codes have adopted ANSI/ASME piping codes
B 31.1 for power piping6.8 and B 31.3 for chemical and
petroleum piping.6.9 The specifier should be sure that the
appropriate piping codes are used in the design and testing
of the system. The contractor should not be permitted to
install conduits, pipes, ducts, or sleeves that are not shown
on the plans or not approved by the engineer or architect.
For the integrity of the structure, it is important that all conduit
and pipe fittings within the concrete be carefully assembled
as shown on the plans or called for in the job
R6.3.2 — The code prohibits the use of aluminum in structural
concrete unless it is effectively coated or covered. Aluminum
reacts with concrete and, in the presence of chloride
ions, may also react electrolytically with steel, causing
cracking and/or spalling of the concrete. Aluminum electrical
conduits present a special problem since stray electric
current accelerates the adverse reaction.
6.3.3 — Conduits, pipes, and sleeves passing through
a slab, wall, or beam shall not impair significantly the
strength of the construction.
6.3.4 — Conduits and pipes, with their fittings, embedded
within a column shall not displace more than 4
percent of the area of cross section on which strength
is calculated or which is required for fire protection.
6.3.5 — Except when drawings for conduits and pipes
are approved by the structural engineer, conduits and
pipes embedded within a slab, wall, or beam (other
than those merely passing through) shall satisfy
220.127.116.11 through 18.104.22.168.
22.214.171.124 — They shall not be larger in outside dimension
than 1/3 the overall thickness of slab, wall, or
beam in which they are embedded.
126.96.36.199 — They shall not be spaced closer than 3
diameters or widths on center.
188.8.131.52 — They shall not impair significantly the
strength of the construction.
6.3.6 — Conduits, pipes, and sleeves shall be permitted
to be considered as replacing structurally in compression
the displaced concrete provided in 184.108.40.206
220.127.116.11 — They are not exposed to rusting or other
18.104.22.168 — They are of uncoated or galvanized iron or
steel not thinner than standard Schedule 40 steel pipe.
22.214.171.124 — They have a nominal inside diameter not
over 2 in. and are spaced not less than 3 diameters on
6.3.7 — Pipes and fittings shall be designed to resist
effects of the material, pressure, and temperature to
which they will be subjected.
6.3.8 — No liquid, gas, or vapor, except water not
exceeding 90 F nor 50 psi pressure, shall be placed in
the pipes until the concrete has attained its design
6.3.9 — In solid slabs, piping, unless it is for radiant
heating or snow melting, shall be placed between top
and bottom reinforcement.
6.3.10 — Concrete cover for pipes, conduits, and fittings
shall not be less than 1-1/2 in. for concrete exposed to
earth or weather, nor less than 3/4 in. for concrete not
exposed to weather or in contact with ground.
6.3.11 — Reinforcement with an area not less than
0.002 times area of concrete section shall be provided
normal to piping.
6.3.12 — Piping and conduit shall be so fabricated and
installed that cutting, bending, or displacement of reinforcement
from its proper location will not be required
R6.3.7 — The 1983 code limited the maximum pressure in
embedded pipe to 200 psi, which was considered too restrictive.
Nevertheless, the effects of such pressures and the
expansion of embedded pipe should be considered in the
design of the concrete member.