PN20 rating at 20°C
PEX EVOH Pipe typically has a PN20 pressure rating. PN20 means 20 bar (290 psi) at 20°C. This is the standard for most residential systems. Example: a PEX EVOH Pipe handles typical water pressures easily.
Pressure decreases with temperature
As temperature rises, pressure capacity drops. At 70°C, PN20 decreases to 10 bar (145 psi). At 90°C, it drops to 7 bar (101 psi). Example: PEX EVOH Pipe requires derating for hot water.
PN16 and PN25 options
Some manufacturers offer PN16 (16 bar) pipes. PN25 (25 bar) is available for high-pressure systems. The rating depends on pipe construction. Example: PEX EVOH Pipe ratings vary by product.
SDR and pressure rating
Pressure rating relates to the SDR (Standard Dimension Ratio). SDR 6 has a higher rating than SDR 7.4. Thicker walls mean higher pressure capacity. Example: PEX EVOH Pipe follows the SDR system.
Cold water pressure rating
At cold temperatures, pressure ratings are higher. The pipe can handle 25 bar at 10°C. This is due to increased material strength. Example: PEX EVOH Pipe has high cold water capacity.
Example: residential hot water
A home has hot water at 60°C and 4 bar. PEX EVOH Pipe easily handles these conditions. The pipe has a large safety margin. Example: a reliable, safe hot water system.
Example: high-pressure commercial system
A commercial system operates at 16 bar and 20°C. PEX EVOH Pipe with PN20 is suitable. The pipe meets system requirements. Example: a safe, reliable commercial system.
Example: heating system at 80°C
A heating system operates at 80°C and 5 bar. PEX EVOH Pipe has a derated pressure of 9 bar at 80°C. The pipe is well within its limit. Example: a safe heating system.
Pressure ratings by standard
ASTM and ISO standards specify pressure ratings. PEX EVOH meets these standards. Ratings are based on extensive testing. Example: PEX EVOH Pipe is certified to industry standards.
Pipe dimension marking
Sizes are marked as 20×3.4, 25×4.2, etc. The first number is diameter (mm). The second number is wall thickness (mm). Example: PEX EVOH Pipe has clear dimension markings.
Maximum operating pressure
The maximum continuous operating pressure is 20 bar. Short-term pressure spikes may be higher. The pipe can handle brief surges. Example: PEX EVOH Pipe has a safety margin for surges.
Final pressure summary
PEX EVOH Pipe typically has a PN20 rating (20 bar at 20°C). PN16 and PN25 are also available. Pressure ratings decrease at higher temperatures. At 70°C, the rating drops to 10 bar. At 90°C, it drops to 7 bar. Cold water ratings are higher. Always check the derating curve for your temperature. PEX EVOH Pipe meets ASTM and ISO standards. Example: choose the correct rating for your system.