CPVC and Bacteria Build Up

CPVC AND BACTERIA BUILD UP

Studies have shown that bacteria build up with
CPVC is far lower than with alternative piping materials - copper, steel and other thermoplastics. Below are some results and conclusions of 3 different studies.

Study 1 :

Health concerns*

"CPVC piping supports the lowest bacterial
growth compared with traditional piping
materials." (see figure 1 )

(*)Study 1:Bakterielle Oberfläcjenbesidlung in trinkwasser-durchströmten Schlauch- und Rohrleitungen; Dr. Georg-Joachim Tuschewitzki; Privatdozent am Hygiene Institut der Universität Bonn; 23.10.1989.

Figure 1 :

Bacterial growth in water piping aat 120 day

Study 2 :
Water deterioration from extended
stagnation conditions in steel, copper and CPVC pipes*

"The clear winner in terms of water
deterioration in this laboratory study is the
CPVC pipe. As can be seen, very little deterioration occurred, even after
extended stagnation" (see figure 2)

"With the absence of chemical corrosion
reactions, the level of solids build-up was
very low compared to the copper and steel pipe sections."

(*) Study 2 : Study conducted by Prof. F.L. hart the Worchester Polytechnic Institute for the US Fire Administration, Federal Emergency Management Agency

Figure 2 :

Turbibity changes during extended periods of stagnation

Study 3 :

Biofilm-forming characteristics of pipe materials for drinking water installations*

"The biofilm concentration was lowest on CPVC" (see figure 1)

"In the presence of the two CPVC materials, the growth of Legionella bacteria in the water was low"
(see figure 2).

(*) Study : "Biofilm Fomation Potential of Pipe Materials in Internal Installations" by order of VROM. Authors : H. R. Veenendaal and D. van de Kooiy - KIWA N.V. - Division Chemistry and Biologie. June 1999. (KIEA is The Netherlands approvals agency for potable water piping systems).

Figure 1 :

Average biofilm concertrations on the
pipe wall (water flow simulating domestic use)

Figure 2 :

Number of legionella bacteria in the test water (average after8,12 and 16 weeks static test, no flow)

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