In general, the strength and therefore the pressure rating of metal hose decreases as the temperature increases.  Thus, as the operating temperature of a metal hose assembly increases, the maximum allowable working pressure of the assembly decreases.   The pressure ratings shown in the specifications charts for corrugated and interlocked hose are valid at 70F.  Elevated service temperatures will decrease these pressure ratings by the factors shown in the following chart.  What also must be considered is the maximum working temperature of the end fittings, of the hose and their method of attachment.

Temperature Adjustment Factors

Example:
Calculate the maximum working pressure for 3/4" ID single braided stainless steel corrugated hose at 800F.
From the corrugated metal hose specification table, the maximum working pressure at 70F is 775 PSIG.
Multiply 775 PSIG by 0.66.  The maximum working pressure at 800F is 511 PSIG.

Maximum Service Temperatures

The component of a metal hose assembly with the lowest temperature rating as shown in this chart determines the maximum service temperature of that assembly.