Pneumatic Tube Technical Data

Burst Characteristics vs Working Temperatures

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

As the temperature falls, the tube will become less flexible, the brittle point temperature being –70°C. 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 tube to burst pressure, as described in BS EN ISO 1402.

Examples

• Burst pressure of NFM6/4 at 23°C = 1450 PSI = 100%
• Burst Pressure of NFM6/4 at 40°C = 80% of 1450 PSI = 1160 PSI
• Burst Pressure of NFM6/4 at 100°C = 37% of 1450 PSI = 535 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.