Estimate the safe working pressure for a 4 in. (100 mm) dia., schedule 40 pipe, carbon steel, butt welded, working temperature 100^{\circ} C. The safe working stress for butt welded steel pipe up to 120^{\circ} C is 6000 lb / in ^{2}\left(41.4 N / mm ^{2}\right).
Question 5.5: Estimate the safe working pressure for a 4 in. (100 mm) dia....
P_{s}=\frac{(\text { schedule no. }) \times \sigma_{s}}{1000}=\frac{40 \times 6000}{1000}=\underline{\underline{240 ~ b / in ^{2}}}=\underline{\underline{1656 kN / m ^{2}}}
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