APPENDIX |

COMPARISON OF P.V.C. AWWA C900
TO
DUCTILE iRON (D.1.) PIPE

A. RESISTANCE TO AGGRESSIVE ENVLRONMENTS

f. Corrosion

P.V.C. pipe is considered to ba immune to all forms

common to metallic pipe and to corrosion affected by
aggressive soils and waters. .

Thermal oeftects

Rett SEER ea eleven

P.V.C. fs a thermoplastic material disptaying a

variation in physical properties with temperature
change.

yee UE See ATH

i) Temperature falls ~ the stiffness and tensile
strength of the pipe increases thereby increasing
the pressura capacity of P.V.C. pipe and its
resistance to earthtoading deflection; hewever,

the pipe loses impact strength and becomes mora
brittle.

Temperature rises = the impact strength and the
flexibility of P.v.c. pipe rises; however, the
pipe loses tensile strength and stiffness
consequently reducing Its pressure capacity.

se OTE Sat lea TE Se ORES Wee

Considering the ‘usual Temperature ranges during
the construction period in the lower mainland the
thermal effects on tha pipe are nat an important
factor providing that the recommended handling and
installation procedures are adhered to.

Expansion/Contraction = the coefficient of therma!
expansion Is approximately 4 times higher for
P.V.~C. than for Q.I. An allowance has been made
by the manufacturer in the design of the pipe
Joint to take care of potential! problems caused by
expansion and contraction.

Biological attack

Polyvinyl Chloride pipe will not deteriorate or braak
down under blological attack although the D.!. pipa
suppliers have stated that P.V.C, pipe is susceptible
to rodent attacks. Actual cases of this problem hava
not been documented by them.