Page 74 - Facility Piping Systems Handbook for Industrial, Commercial, and Healthcare Facilities

PIPING

2.24 CHAPTER TWO

mechanically while being resistant to a wide variety of chemicals. Joints are bell and
spigot secured with adhesive, threaded and secured with adhesive, butt and wrapped,
and mechanical joints. Adhesives selected depend on the specific service intended and
type of pipe.
The resin is the binder that holds the composite structure together. It supplies the source
of temperature and chemical resistance. There are four resin types: epoxy, polyester, vinyl
ester, and furans. Furans are difficult to work with and are rarely used. Epoxy and vinyl
ester are the most widely used. Epoxy resin is stronger than vinyl ester. The curing agent
(or catalyst) also has an effect on the chemical resistance of the pipe. Aromatic amine-cured
epoxy has better chemical resistance than polyamide-cured epoxy.
The various combinations of materials are resistant to a great variety of chemicals and
suitable for many services. Consult manufacturers’ information to select the appropriate
pipe material combination.
RTHP pipe should conform to the following ASTM standards:

1. D-3262: sewer pipe, D-3840 and D-4160: fittings
2. D-3754 and D-3517: pressure pipe
3. D-2996: filament wound pipe
4. D-299: centrifugally cast pipe

OTHER PIPING MATERIALS

ASBESTOS CEMENT PIPE (ACP)

Asbestos cement pipe is manufactured by mixing portland cement (with or without silica)
and asbestos fiber. This pipe is widely used for pressurized systems such as potable water
mains and noncorrosive, nonpressurized sewer systems. Piping is available in sizes ranging
from 4 to 42 in (100 to 1000 mm), and in pressure ratings ranging from nonpressure (gravity)
pipe to 100-, 150-, and 200-psi pressure-rated pipe and fittings. Gravity pipe is made in five
strength classes, each denoting the three edge-bearing strengths regardless of size. These
strength classes are 1500, 2400, 3300, 4000, and 5000 lb per linear foot.
Joints are made using compression gasket joints or asbestos-cement/rubber-gasket
joints.
Asbestos cement pipe shall conform to the following standards:

1. AWWA C-400, 401, 402, and 403: pressure pipe
2. ASTM C-428: gravity pipe.

GLASS (GL)

Glass pipe is made from a low expansion borosilicate glass with a low alkali content. It is
used for laboratory gravity waste service and is available in sizes up to 6 in. The pipe is
joined by an elastomeric compression gasket secured by a sleeve. Glass pipe conforms to
the following standards: ASTM C 599 and Federal Specification DD-G-541B.
This pipe is primarily used for drainage of various corrosive liquids. It is considered
very brittle, and should be used where it has some measure of protection, such as in pipe
spaces or behind laboratory furniture.

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