| Hot water or aqueous fluids | EPDM is commonly considered for hot water service; the actual compound and hose construction must be confirmed. | Check the fluid’s additives, cleaning chemicals, concentration, and exposure duration against the hose supplier’s compatibility data. | Confirm the hose’s rated working temperature and pressure together. Hot service can reduce allowable pressure; do not rely on a temperature rating alone. | Verify the complete assembly, including end connections, seals, and clamps, is suitable for the operating conditions. Check applicable potable-water requirements if the fluid is for consumption. |
| Saturated steam | Use a hose specifically designed and identified for steam service; do not assume a general-purpose EPDM or rubber hose is suitable. | Confirm the hose is approved for saturated steam, and check whether superheated steam, condensate, or cleaning chemicals are present. | Match the steam pressure to its saturation temperature and the hose’s steam-service rating. Account for pressure cycling and temperature at the hose, not just at the boiler. | Check assembly and inspection requirements in the applicable specification, such as ISO 6134 where relevant. Follow the hose maker’s installation, inspection, and replacement instructions. |
| Hot oil or petroleum-based fluids | NBR or FKM may be candidates for screening, depending on the exact oil, temperature, and hose design. | Identify the oil type, additives, and any fuel or solvent content. Verify compatibility of the tube, cover, and seals; one suitable layer does not establish whole-hose compatibility. | Check the rated temperature and pressure for the specific fluid and duty cycle. Include surge pressure, continuous exposure, and any periods of elevated temperature. | Confirm permeation, fire-risk controls, and electrical-conductivity requirements where relevant. Verify that fittings and seals are rated for the same service. |
| Hot air or dry gas | EPDM, silicone, or other heat-resistant constructions may be considered, subject to pressure, gas, and application requirements. | Check for ozone, oil mist, chemicals, and gas permeation. Confirm the material is suitable for the specific gas and is not merely rated for hot air. | Verify temperature and pressure ratings for the assembled hose. For suction service, check vacuum resistance and the minimum bend radius. | Confirm the hose cannot collapse, kink, or loosen under operating conditions. Check whether gas permeability or static charge presents a hazard. |
| Hot chemical solutions | PTFE-lined or other chemically resistant hose constructions may be candidates; selection depends on the chemical and full assembly design. | Record the chemical name, concentration, temperature, mixture, and cleaning agents. Consult a compatibility chart or obtain written confirmation for the exact conditions. | Check pressure derating at operating temperature, permeation limits, and resistance to pressure cycling. A lining’s chemical resistance does not by itself establish the pressure rating. | Verify fitting material, liner retention, and assembly configuration. For regulated chemical service, check applicable local requirements and the relevant hose specification, such as EN 12115 where applicable. |
| Hot abrasive slurry | Abrasion-resistant rubber lining may be considered, with the compound selected for both the slurry and temperature. | Assess solids type, particle size, concentration, flow velocity, and any corrosive liquid phase. Ask for wear data relevant to the actual duty. | Confirm temperature and working-pressure limits, plus resistance to vacuum or pulsation if present. Consider the effect of bends and flow direction on wear. | Inspect for cover damage, exposed reinforcement, leakage, and excessive wear at bends. Establish an inspection and replacement schedule based on service conditions. |
| Intermittent hot service or thermal cycling | Select a construction rated for the actual peak temperature and repeated heating and cooling; material name alone is not sufficient. | Check compatibility during both hot operation and cool-down, including condensation, cleaning, and chemical concentration changes. | Record minimum, normal, and peak temperatures, exposure time, pressure changes, and cycle frequency. Verify ratings for the complete hose assembly. | Check for thermal expansion, movement, abrasion, and strain at fittings. Support and route the hose according to the supplier’s instructions. |
