Schedule No. and High Cycle./ Low Stress Piping

1.What is the concept of the Schedule No. e.g. Schedule 40. How does it relate to the pipe wall thickness?

2. What is the basis of the 7000 cycles for the stress reduction factor f of 1.0 shown on Table 302.3.5

3.. Section VIII Div 2/ Fig. 5-110.1 shown on Appendix 5 - Mandatory. The figure shown is for the fatigue curves. It shows that if the interesection of the Se (per 319.4.4) and the f is below the fatigue curve, your pipe is OK. Question - is the f indicated on the fatigue curves the same as the stress reduction factor referred to 302.3.5?

4.The calculation of the wall thickness for straight pipe under internal pressure is farily easy using the hoop stress or the modified Lame equation per 304.1. But what about the calc of wall thickness considering external pressure such as those used in double jacketed pipe Received on Mon Jun 18 05:04:00 2001