Robert F
check into teflon and silicon with steel or stainless covering

sciquest
You didn't mention the chemical detail. The cause of failure could be one, or a combination of, thermal (harness change or tensile strength change at elevated temperature), chemical (molecular disintegration), or mechanical (bend or vibration fatigue). Your temperature condition does not seem stressful at all. All four groups of typical hose's base rubber (methyl, vinyl, phenyl, and fluorine-containing) should be capable. If the cause was in deed thermal or chemical you may want to try one of the toughest filler materials such as the pink-color fluorosilicone. Fluorine has an electronegativity even higher than oxygen so that the hose microstructure is at an energy level lower than all possible oxidization phases, and hence cannot be disintegrated by oxidation. The cause of failure may be mechanical fatigue due to either repeated flexing or excessive vibration. To reduce bending strain, you may want to dress the hose to form a larger strain relief loop so that no sections of the hose will be bent too acutely. For vibration, failure is more likely when resonance occurs. A lose hose structure may have very low natural frequency. Resonance occurs when a new cycle of vibration external force adds in phase with the ongoing natural vibration mode of the hose. It is critical that you do not let any of the pump vibration modes be near a natural frequency of any hose section. If needed you may want to tie the hose down to the pump's chassis at as many points as possible to increase the hose structure's natural frequency.

AL in Bama
Sounds like you need a stainless steel braided hose with a teflon liner inside.

reza_hemmatdj
the hose should be suitable. the hose u should provide depends on the pressure that the compressor provides , the gas passing through it and the temperature of your working fluid.

rice_dog
AL in Bama has the correct answer! I have converted several recip. and Rotary-Screw compressors to Stainless Steel Braided Reinforced Teflon hoses many times in my career for this condition you describe!

Fittings Doc
The first thing you should examine is the hoses application. You say it moves up and down but do not indicate at what frequency this cycle occurs. Any high frequency of movement will shorten the hose's service life accordingly. Physical flexing of the hose beyond its RATED bend radius can also be a cause of Physical stress that leads to premature failures. You should also look into the other environmental and compatibility issues IF the rubber hose you are using is RATED for the temperatures you have listed. Remember that the RATED maximum temperature is the highest temperature to which the hose should EVER be exposed. That is BOTH the interior temperature of the Air in the hose and the exterior environment in which it is placed. All to often when I found this type of hose failures these factors were overlooked. One such example was found in Steel Mills where the exterior of the hose was so hot it baked both the exterior and interior of the hose. Something you should also look at is whether the hose is being lubricated, as in air tool use, if so the hose must be compatible with the lubricant or it will deteriorate. My GUESS, since you seem t be having a problem with both the interior and exterior of the hose, is that the hose is being overflexed in an environment where you REAL temperature requirement exceeds the 150-200 degree F, or you are spiking pressures beyond the RATED maximum working pressure of the hose. If you require frequent movement you might talk to your supplier about installing a Swivel Joint of some kind to take the stress off the hose. Most hose manufacturers/distributors will be able to look at the application and advise you accordingly. If yours cannot come up with a solution, once they have ALL the information, it might be time to find another source. Good Luck