When CPVC Pipes and Fittings Fail in Hydronic Heating Systems

Priddy, Duane B.; Arnold, B.C.; Battjes, Kevin

doi:10.1002/j.1941-9635.2012.tb00827.x

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…During attachment, the peak of biofilms in PE pipe was 33 mgVSS/cm 2 with a growth rate of 4.75 mgVSS/cm 2 .d, which was significant higher than that of PVC pipe giving 6 mgVSS/cm 2 and a growth rate of 1.01 mgVSS/cm 2 .d. This may be because PVC pipe commonly coated with antimicrobial agent in manufacturing process [14] while none of that for PE pipe. Consideration of the influence of the flow velocity, because the velocity fluctuation in water distribution is typical in a network, therefore biofilm density commonly decreased with decreasing flow velocity [10].…”

Section: Development Of Biofilms In Pipelinementioning

confidence: 99%

Colonization of Microbial Biofilms in Pipeline of Water Reuse

Kumjaroen

Chiemchaisri

2014

Environmental Engineering Research

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Aim of this study was to investigate biofilms attached in pipeline of water reuse from the MBR system treating sewage without chlorination in correlation to the outflow water quality. Two general pipe materials: polyvinyl chloride (PVC) and polyethylene (PE) were employed in the experiment. The peak growths were found at week 4 in both pipes. The maximum biofilms in PE pipe was 33 mgVSS/cm 2 with the growth rate of 4.75 mgVSS/cm 2 -d which was significant higher than that of PVC pipe. Biofilms examined by PCR-DGGE technique revealed five bacterial species in PE biofilms namely Sinorhizobium medicae WSM419, Sinorhizobium fredii NGR234, Geobacter sp. M18, Parachlamydia acanthamoebae UV-7, and Mycobacterium chubuense NBB4. The VSS concentrations in outflow had directly correlated to the biofilm attachment and detachment. High COD concentrations of outflow appeared during biofilm detaching phase. In summary, water quality of reuse water corresponded to the biofilms attachment and detachment in the pipeline.

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Section: Development Of Biofilms In Pipelinementioning

confidence: 99%

Colonization of Microbial Biofilms in Pipeline of Water Reuse

Kumjaroen

Chiemchaisri

2014

Environmental Engineering Research

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“…Since primer is used to soften surface layer of CPVC pipe before the joining, primer acts as a plasticizer [ 6 ], and thus it has been suspected that the use of primer may introduce ESC in the CPVC pipe. However, the role of primer on the CPVC pipe failures has attracted little attention so far, even though ESC in CPVC pipe has been reported in the literature [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Acetone and Primer on Strength and Ductility of Chlorinated Poly(vinyl chloride)

Huang²,

Jar³

2023

Polymers

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Primer is widely used to prepare bonding of chlorinated poly(vinyl chloride) (CPVC) pipe. The study examined the influences of primer and its major component, acetone, on CPVC’s mechanical properties. Two types of CPVC product, sheet and pipe, were used in the mechanical testing. Sheet specimens were immersed in acetone or primer for 40 and 10 min, respectively, i.e., the maximum allowable time without mass loss, and then dried in air before the mechanical testing. Pipe (ring) specimens were treated either through immersion in acetone or primer for 30 min or in contact with these solvents locally on the inner surface for 2.5 h, and then air dried for 10.5 days before the mechanical testing. Results showed that CPVC’s strength decreased after the absorption of these solvents, and air dry could remove acetone but not completely primer. The study also showed that pipe specimens by local contact with primer could generate brittle fracture. In view that sheet specimens always fractured in a ductile manner, brittle fracture of the pipe specimens could not be caused by CPVC degradation. Rather, strength decrease in the local region could provide a plausible explanation for the brittle fracture behavior, though further investigation is needed.

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“…Thanks to the large active surfaces, such systems further require significantly lower flow rates and can be operated at reduced temperature gradient, thereby improving the performance of heat pump systems and allowing for the use of alternative resources that operate at lower primary temperature, such as geothermal energy, groundwater, ambient air, or process heat . Rare cases of system failure have been reported, which are generally attributed to the contamination of the refrigerant or oxygen infiltration leading to corrosion issues in the hydronic system . When embedded in opaque building components, such failures are hardly detectable and cost‐intensive to repair.…”

Section: Introductionmentioning

confidence: 99%

Outdoor Performance of Fluidic Glass–Glass Laminate Windows for Building Integration

2019

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Fluidic windows enable the implementation of liquids in building envelopes. Such liquids may act as a heat reservoir and exchange medium or provide additional functionality to the building skin. Here, outdoor operations of double‐glazed windows which include a transparent capillary panel as one of the glazings are reported. The capillary devices were used as heat exchangers by which water circulates across the window surface. A mobile demonstration facility is built, which uses 1.6 m2 of active window surface for thermal input to a test room of 9 m3. Outdoor operations are conducted over multiple weeks in winter and summer seasons to demonstrate hydronic heating and cooling, respectively, by varying the inlet temperature and the flow rate of the circulating liquid. For heating operations at an outdoor air temperature of −5 °C, an overall heat transfer coefficient of 22 W m−2 K−1 is demonstrated. Using the same system for cooling with southeast façade orientation at an average solar irradiance of 800 W m−2 enables significant reduction of peak and average room temperature. In comparison to conventional heating, ventilation and air‐conditioning technology, a significant reduction of the applied temperature gradient and air circulation rates is achieved.

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When CPVC Pipes and Fittings Fail in Hydronic Heating Systems

Cited by 3 publications

References 3 publications

Colonization of Microbial Biofilms in Pipeline of Water Reuse

Colonization of Microbial Biofilms in Pipeline of Water Reuse

Influence of Acetone and Primer on Strength and Ductility of Chlorinated Poly(vinyl chloride)

Outdoor Performance of Fluidic Glass–Glass Laminate Windows for Building Integration

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