Melting temperature of PVC

[Finnegan]

The plumber ran a pvc sch. 40 waste line about 1/4" away from a 1 1/4" iron monoflow loop heating pipe which feeds hot water baseboards. This near contact point occurs at a 90 degree bend, so if I push the two pipes together, there is only contact at that point as opposed the two two pipes running parallel. I expect the water temperature will be about 180 degrees in the heating pipe. Will there be a problem with the pvc melting or becoming brittle from the heat? I could not find anything on line about this and plumber says its fine.

[Chad Fabry]

Re: Melting temperature of PVC

It's rated for 140 degree water.

I can't say for sure that your scenario is OK, but I'd wrap the pvc loosely(leave what ever air gap possible) w/ some light gauge aluminum or that shiny pipe wrap and I wouldn't lose sleep.

[Finnegan]

Re: Melting temperature of PVC

That's what I was looking to hear. I have enough room to get a little insulation in between the two. I will give that a shot.

[johnsr]

Re: Melting temperature of PVC

The continuous service temperature limit for PVC is 160 degrees F. Max deflection temp is 154 degrees F. PVC is not rated for hot water service. The melting point is 360 degrees F.

Since this is a drain line and not under any pressure, there should be no problem as long as you take the suggestion to insulate the area around the potential point of contact.

[Chad Fabry]

Re: Melting temperature of PVC

Physical Properties of PVC Pipe Value Test Method
GENERAL
Cell Classification 12454 ASTM D1784
Maximum Service Temperature 140°F
Color white, dark gray
Water Absorption % increase 24hrs @ 25°C .05 ASTM D570
Hardness, Rockwell 110-120 ASTM D785
Poisson's Ratio @ 73°F .410
Hazen-Williams Factor C=150
MECHANICAL
Specific Gravity (g/cu,cm) 1.40 ± .02 ASTM D792
Tensile Strength, psi @ 73°F 7,450 ASTM D638
Modulus of Elasticity, psi @ 73°F (Tensile Modulus) 420,000 ASTM D638
Flexural Strength, psi @ 73°F 14,450 ASTM D790
Compressive Strength, psi @ 73°F 9,600 ASTM D695
Izod Impact, ft-lb./in. @ 73°F .75 ASTM D256
THERMAL
Coefficient of Linear Expansion (in/in/°F) 2.9 x 10 (to -5) ASTM D696
Coefficient of Thermal Conductivity (BTU/in/hr/ft/°F) 3.5 ASTM C177
Heat Distortion Temperature, °F @ 264 psi 170 ASTM D648
Specific Heat, Cal/°C/gm .25 ASTM D2766
ELECTRICAL
Dielectric Strength, V/mil 1,413 ASTM D149
Dielectric Constant, 60 Hz, 30°F 3.7 ASTM D150
Volume Resistivity, ohm/cm @ 95°C, ohms/cm 1.2 x 10 (to 12) ASTM D257
Harvel PVC Pipe is non-electrolytic
FLAMMABILITY
Flammability Rating V-0 UL 94
Flame Spread Index <10 ASTM E162
Flame Spread 0-25 10-25 ULC ASTM E84
Flash Ignition Temp 730°F
Average Time of Burning (sec.) <5 ASTM D635
Average Extent of Burning (mm) <10
Burning Rate (in/min) Self Extinguishing
Softening Starts, (approx.) 250°F
Material Becomes Viscous 350°F
Material Carbonizes 425°F
Smoke Generation 80-225 600-1000 ULC ASTM E84

[Kgphoto]

Re: Melting temperature of PVC

I would take a piece of Hardy board tile undelayment and put between the two pipes. That would insulate it fully. this is the 1/4 gypsum tile undelayment material. I may be calling it by the wrong name.

Kirk

[Chad Fabry]

Re: Melting temperature of PVC

KG,

That's a good idea