Spring-Lined Convoluted PTFE Hose Installation Steps for Steam, Hot Air and Corrosive Chemical Lines

JINGCHENG Spring-Lined Convoluted PTFE Hose (series JCC-20000-PTFE) combines a smooth-wall PTFE inner tube, a corrugated outer profile and a 304 stainless steel spiral spring middle layer for highly corrosive chemicals, hot air, hot oil and steam from -65°C to +260°C. This page takes installers through six steps — sizing against the catalog table, routing around the minimum bend radius, cutting, end connections, avoiding twist and heat shock, and commissioning — plus a table of common installation mistakes.

Why Installation Matters for a Spring-Lined PTFE Hose

The JINGCHENG JCC-20000-PTFE hose is built in three functional parts: a PTFE inner tube with a smooth inner wall, a corrugated outer profile, and a 304 stainless steel spiral spring in the middle layer. That construction gives it a smooth, easy-to-drain bore together with crush and kink resistance, and it is rated from -65°C to +260°C for highly corrosive chemicals, hot air, hot oil and steam in the food, cosmetics, chemical and pharmaceutical industries. Many field problems with this type of hose are caused not by the hose itself but by the way it is cut, routed and connected. The steps below follow the catalog limits so the line performs as specified from the first start-up.

Step 1: Confirm the Size Against the Catalog Table

Before cutting anything, check that the chosen size covers the system pressure and the space available for bends. The seven standard sizes are:

Data source: JINGCHENG PTFE Hose Catalog (JCC-20000-PTFE Series). Operating temperature range: -65°C to +260°C. All specifications can be customized according to customer parameters.

Select a size whose working pressure is above the highest pressure the line will see in service. Burst pressure is a safety margin only and should never be used as an operating figure. Note that working pressure falls as the bore grows, from 2.64 MPa at 1/4" to 1.2 MPa at 1".

Step 2: Plan the Route Around the Minimum Bend Radius

The spring lets this hose bend far more tightly than a plain smooth bore tube, but every size still has a minimum: 19 mm for 1/4" and 5/16", 25 mm for 3/8", 38 mm for 1/2", 50 mm for 5/8", 63 mm for 3/4" and 75 mm for 1".

• Measure the bend radius at the centreline of the hose, not at the inside edge.

• Keep a short straight section next to each end connection instead of bending right at the fitting.

• Where the layout is tight, add length rather than forcing a smaller radius.

Step 3: Cut and Prepare the Ends

• Cut the hose square with a sharp tool so the spring and PTFE layers end cleanly.

• Remove loose fragments from the bore, especially on chemical and pharmaceutical lines where particles must not enter the process.

• Check that the spring end does not protrude into the sealing area of the connection.

Step 4: Make the End Connections

• Use connections matched to the actual inner and outer diameters in the table, for example 13.6 mm ID / 15.1 mm OD for 1/2".

• Push the hose fully onto the connection and secure it evenly; uneven clamping is a common source of leaks on corrugated outer walls.

• For finished assemblies, ask us to supply the hose with ends fitted to your drawing, since all specifications can be customized to customer parameters.

Step 5: Avoid Twist, Abrasion and Heat Shock

• Do not twist the hose during installation. Twisting loads the spring and the PTFE wall and shortens service life.

• Support long horizontal runs so the hose does not sag onto hot surfaces or sharp edges.

• On steam and hot oil lines, bring the system up to temperature gradually and keep the operating point inside -65°C to +260°C.

Step 6: Commissioning Checks

1. Inspect every connection visually before pressurising.

2. Pressurise gradually and stay below the catalog working pressure for the size.

3. Check for leaks at each end and for any flattening at bends.

4. Record the installation date so the line can be included in routine inspections.

Common Installation Mistakes

Order the JCC-20000-PTFE Hose

Send us the medium, temperature, pressure, size, length and end connection details, and our engineers will confirm the right size and supply hoses or assemblies made to your parameters.