Standard rating: 100 psi at 180°F
PP Compression Fittings typically have a pressure rating of 100 psi (6.9 bar) at 180°F (82°C). This is the standard for polypropylene fittings. It matches the rating of PP pipe. Example: a compression coupling handles 100 psi.
Rating at room temperature (73°F)
At 73°F (23°C), the pressure rating is higher. Many fittings handle 150-200 psi at room temperature. This is due to the material's strength. PP Compression Fittings exceed pipe burst strength at cold temperatures.
Burst pressure
The burst pressure tests at 400-600 psi typically. This is 4-6 times the working pressure. Safety margins protect against pressure spikes. PP Compression Fittings have large safety factors.
Temperature derating
As temperature goes up, pressure rating goes down. At 140°F (60°C), rating might be 120 psi. At 200°F (93°C), rating drops to 60-80 psi. PP Compression Fittings follow derating rules.
Pressure rating by pipe size
Pressure ratings may vary by pipe size. Smaller diameters often have higher ratings. Larger diameters may have lower ratings. PP Compression Fittings ratings are size-specific.
Example: residential application
A house has water at 60 psi and 120°F. PP Compression Fittings easily handle these conditions. The fittings have a large safety margin. Example: a reliable system.
Example: commercial application
A commercial building has water at 80 psi and 140°F. PP Compression Fittings are suitable. The pressure is below the rating. Example: a safe commercial system.
Example: high-temperature heating
A heating system operates at 180°F and 60 psi. PP Compression Fittings are suitable. The rating is 100 psi at 180°F. Example: a safe heating system.
Pressure testing
Fittings are tested at 1.5 times working pressure. This ensures safety and reliability. PP Compression Fittings pass rigorous testing.
Manufacturer specifications
Always check the manufacturer's pressure rating. Some brands may have different ratings. PP Compression Fittings should be used per guidelines.
Pressure ratings and safety
Do not exceed the rated pressure. Over-pressurization can cause failure. PP Compression Fittings are safe when used correctly.
Final pressure summary
PP Compression Fittings have a pressure rating of 100 psi at 180°F. At room temperature, ratings exceed 150 psi. Burst pressure is 4-6 times higher. Temperature derating applies at higher temperatures. PP Compression Fittings are reliable for most applications. Example: choose fittings with the right rating for your system.