Laserfiche WebLink
<br />Analysis <br />Since the strength property of the pipeline is known, Figure 1 can be <br />used to solve the inverse probl®, specifically, determining a safe level of peak <br />particle velocity based on the design strength of the pipeline. Pertinent data <br />and strength charactesiatica of the pipeline are given in Appendix A. <br />The design strength of a steel pipeline is defined as the Specified <br />Minimum Yield Strength (SPII'S>. ltte pipeline of concern has an calculated S!fl'S of <br />41,000 psi. (See Appendix A) <br />In addition, there is a static stress on the pipeline from internal <br />• <br />pressurization which must be considered. At the nazvw.l operating pressures of 400 <br />psi, the pressurization stress for the pipeline is calculated in Appendix B. <br />Bence, the allowable blast-induced stress for the pipe can then be determined by <br />subtracting the internal pressurization stress from the value given by SMYS, as <br />shown below in Table i. <br />TABi$ I <br />Raton Gas Transmission Oomparry: <br />SMYS 41,000 psi <br />Internal Pressurization Stress 11,000 psi <br />Allowable Blast-induced Stress 30,000 psi <br />1t~e envelope of the SRI data plotted in Figure 1, which assumes a <br />caret case condition, can be used to determine the levels of ground motion <br />corresponding to the values of allowable blast-induced stress. 'itiese are listed <br />below in 15b1e II. <br />-4- <br />