Temperature Correction Factors
As the service temperature increases, the maximum pressure a hose assembly can withstand decreases. The material from which the hose is made and the method of fitting attachment (mechanical, soldered, welded, silver brazed) determine the maximum pressure at which an assembly can be used. By using the factors given in the chart below, the approximate safe working pressure at elevated temperatures can be calculated for assemblies with welded or mechanically attached fittings.
Determine if 3/4" annular stainless hose with welded fittings is satisfactory for the given operating conditions?
Maximum operating temperature is 700°F.
Maximum operating pressure is 200 PSIG.
From the Series HSA specification table — nominal rated burst pressure for 3/4" hose with 1 braid with welded fittings is 3200 PSIG.
From Temperature Correction Factors Chart — factor for stainless at 700°F is .70
Rated Burst Pressure: 3200 PSIG x .70 = 2240 PSIG
(rated burst pressure at 700°F)
Safe Operating Pressure: 2240 ÷ 4 = 560 PSIG (using 4:1 safety factor)
Since the maximum operating pressure for 3/4” HSA with 1 braid at 700°F is 560 PSIG the hose will meet the required operating conditions outlined above.
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