UV exposure problems could be minimized by applying light color water-based
latex paint on exposed portion of the pipes.
PVC Pipe 4" diameter schedule-40 specification (ASTM D1785)
Outside diameter: 4.5"
Inside diameter: 3.998"
Max working pressure: 220psi, non-shock
Tts rating is only applicable for 73°F. You have to apply the following
derating factor at higher temperatures:
(°F) De-Rating Factor 731.00 800.88 900.75 1000.62 1100.51 1200.40 1300.31
1400.22
Example: If the system will operate with water temperature up to 90°F, the
highest allowable working pressure will be = 0.75 x 220psi = 165psi.
Sudden closure water hammer pressure is about 65psi for a 4" dia s-40 PVC pipe
based on the site layout and a flow rate of 9L/s, leaving only 100psi available
for the working pressure.
I haven't found info on burst pressure of PVC pipes but based on typical
physical characteristics of PVC pipes, I've computed a Safety Factor of 2.5 for
Tom's application. I agree that only pressure fittings should be used. Treading
will cut the safe working pressure by half.
mengelmar <[EMAIL PROTECTED]> wrote:
--- In [email protected], Eilrem Fernandez
<[EMAIL PROTECTED]> wrote:
> GI pipes are mild steel pipe coated with zinc, while BI means black
iron or uncoated mild steel pipe. High pressure PVC pipes are usually
rated at 100psi, equivalent to a maximum of 70m head. However, this
just left you a small factor of safety. An accidental blockage of the
nozzle or too rapid closure could cause the pipes to burst.
>
He should be alright with 4" Sched. 40 PVC (NOT cell-core) and
pressure fittings. ASTM D1785 "Standard Specification for Poly(Vinyl
Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120" indidcated a
maximum working pressure of 133psi with a burst pressure of 700 psi.
Keep in mind that UV exposure will cause the pipe to become more
brittle over time.
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