PENFLEX

The Penflex Hose and Braid Product Catalog lists the maximum pressures for hose assemblies “at 70 °F”. What if I have a temperature which is higher?

The maximum pressures of braided assemblies are based for the most part on theoretical calculations of braid strength which use the “Ultimate Tensile Strength” of the wire used to make the braid. As the temperature increases, the “Ultimate Tensile Strength” of the wire decreases and this reduces the pressure the braid can handle. For this reason, it is the alloy of the braid, not the hose, which should be used to choose the temperature adjustment factor in the following table.

TEMP REDUCTION FACTORS	304L	316L	321	MONEL	BRONZE
TEMP deg F
70	1.00	1.00	1.00	1.00	1.00
150	0.95	0.93	0.97	0.93	0.92
200	0.91	0.89	0.94	0.90	0.89
250	0.88	0.86	0.92	0.87	0.86
300	0.85	0.83	0.88	0.83	0.83
350	0.81	0.81	0.86	0.82	0.81
400	0.78	0.78	0.83	0.79	0.78
450	0.77	0.81	0.81	0.77	0.75
500	0.77	0.78	0.78	0.73
600	0.76	0.76	0.77	0.72
700	0.74	0.76	0.76	0.71
800	0.73	0.75	0.68	0.70
900	0.68	0.74	0.62
1000	0.60	0.73	0.60
1100	0.58	0.67	0.58
1200	0.53	0.61	0.53
1300	0.44	0.55	0.46
1400	0.35	0.48	0.42
1500	0.26	0.39	0.37

Additional information and an example of how to calculate the maximum working pressure at elevated temperatures can be found in our Corrugated Metal Hose and Braid Specification Guide.