limitations which must be observed when specifying
plastic pipe for service from laundries, kitchens,
and other facilities discharging large quantities of
water at elevated temperatures (the temperature
limit given is for short-time, nonpressure use only;
lower temperature limit is required for long-time
use or for pressure use):
ABS ......... 82 degrees C (180 degrees F)
PVC ......... 71.degrees C (160 degrees F)
j. Do not use ABS pipe for applications where high
chemical resistance is desired, such as in lines
from laboratories or hospitals.
k. Use caution if considering concrete pipe for
septic flows. Depending on septicity, these pipes
may not be satisfactory.
2.
Pipe design:
a. Specify equivalent pipe design for the project
conditions (using the applicable criteria for each
pipe material) for each pipe material insofar as is
practicable. American Society of Civil Engineers
(ASCE Manual No. 37, "Design and Construction of
Sanitary and Storm Sewers," contains methods of
calculation for structural requirements of pipe;
from these, the required strengths for pipe of
various materials may be determined. Investigate
external loads, including earth loads, truck loads,
seismic loads, and impact, in the design stage of
the project.
b. Give special attention in the design stage of
project to plastic pipe materials, particularly with
respect to superimposed external loads which could
cause excessive deflection of the pipe. The degree
of sidefill compaction should be considered
realistically, particularly in marginal cases.
c. Where different classes, strengths, etc., of
pipe are required for different sections of long
pipelines due to significant differences in external
loading, expand or modify the applicable paragraphs
of this specification accordingly. Show the limits
for each class, strength, etc., either on the
project drawings or appropriately describe them in
the applicable paragraph of the project
specification.
3. Pipe joints: When more than one type of joint
is applicable for the specified piping, permit each
as a contractor's option except where watertight
joints are necessary in areas where root penetration
problems are anticipated. In these cases,
rubber-gasketed or compression-type, or
solvent-cemented joints are preferred. Use fuel
resistant joint gaskets when required.
SECTION 02531
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