What is the fire rating for schedule 40 stainless steel pipe?

Answer 1

It depends on the size of the pipe. The larger the inside diameter, the lower the pressure rating.

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In case you're looking for an answer that actually answers the question.....

http://www.engineeringtoolbox.com/stainless-steel-pipes-pressure-ratings-d_346.html

(Note that schedule 10S is not included, and this information is for schedule rated stainless steel pipe only!!!!!!)

Answer 2

Heat resisting properties of stainless steelsMost stainless steel grades that would be considered for building applications ie the 304 (1.4301) and 316 (1.4401) types have useful, long-term oxidation resistance at temperatures over 800°C and do not begin to melt until temperatures of over 1375°C are reached. It is unlikely that uniform, sustained high temperatures like these would be reached in short term 'transient' fire conditions.

The short term mechanical (tensile) strength, elastic (Youngs) modulus and physical properties of thermal expansion and conductivity are of interest in assessing stainless steels for fire resistance.

The 304 and 316 austenitic types loose strength to about 55% of their ambient temperature levels at 700°C, the 0.2% proof strengths being around 225 to 308 Mpa (N/mm2) at ambient to 95 to 131 Mpa (N/mm2) at 700°C. The modulus, typically around 200KN/mm2 at ambient temperatures, falls to around 144 KN/mm2 at 700 °C for type 304. This is significantly different from carbon steels, where the modulus at 800 °C can be as low as only 9% of the ambient value.

The higher thermal expansion rates for the austenitic stainless steels means that physical distortion can be a problem in transient fire conditions where thermal gradients are likely to be large.

The thermal conductivity of the austenitic family is lower than ferritics and although this may be useful in containing heat flow through a structure, it may contribute to thermal distortion.

Allowances for distortion and seizing of items like fire doors should be considered.