Burst Pressures and Working Temperatures

This graph provides a guide to the relationship between pressure capabilities of the Colex industrial range of hose and tube, when working within a recommended working temperature range.

As the temperature falls the hose will become less flexible, the cold bend temperature being: –45°C for PVC & –70°C for Polyurethane.

Extreme caution should be taken if the temperature is exceeded. Any increase in temperature above 20°C will result in a decrease in the short term burst pressure.

Short term burst pressure is defined as the value recorded when testing a hose from zero pressure to burst pressure, in a single uninterrupted attempt.

Examples

Burst pressure of RP19/26 at 20°C = 550 PSI = 100%
Burst pressure of RP19/26 at 40°C = 55% of 550 PSI = 302 PSI
Burst pressure of RPU10/16 at 20°C = 780 PSI = 100%
Burst pressure of RPU10/16 at 40°C = 55% of 780 PSI = 429 PSI

Safety Factors

When selecting a hose for an application it is vital that an adequate safety factor is taken into account. Below is an extract from ISO 7751 : 1997 which will assist an installer in providing a proven level of safety. Discretion is advised when determining a safety factor for your chosen application