According to leading leading manufacturer and supplier of specialised hoses, expansion joints and fittings, Pacific Hoseflex
, there are a number of design considerations to take into account when selecting PTFE hoses.
Database for pressures
All stated burst pressures are static and are measured on samples at ambient temperature from which averages are recorded to create relevant specifications.
Proof or test pressures are usually twice working pressure and all burst pressures are conservatively rated to provide a high margin of safety.
PTFE liner resists all chemicals and solvents, apart from molten alkali metals, Chlorine Trifluoride and Fluorine Gas.
Quality of the hose
Pressure test random length hoses. Ensure satisfactory and appropriate testing before supplying the hose assemblies to your customers for final use. Check the hoses extensively throughout all stages of the manufacturing process.
Reduced static PTFE hose
A damaging electrostatic charge can build up inside the hose when electrically resistive fluids are being transmitted at very high flow rates. This can be prevented by mixing a special carbon with the PTFE to reduce its resistivity.
Temperature and pressure
Increased working temperatures require a reduction in maximum rated working or burst pressure. Whenever excessive flexing, vibration, thermal fluctuations or rapid pressure impulsing is in evidence, further caution should be exercised in reducing the maximum working pressure.