APPENDIX H – Check Valves
Surge Analysis and the Wave Plan Method
Supplementary Material: Example Problems and Solutions
Appendix H – Problem 7
H.7 A pump trip surge analysis was performed on a long transmission main using some popular software assuming certain characteristics for the check valve downstream of the pump that was tripped. A generic slanted-seat check valve was proposed for this project. The flowrate variation within the pipeline immediately downstream of the tripped pump was recorded and the associated flow deceleration curve was plotted as shown in the following figure. The variation in the pressure head at a node immediately downstream of the tripped pump was recorded and plotted along with the variation in the flowrate as shown in the following figure. If the celerity of pipeline connected to the downstream end of pump is 981 m/s, determine if the data assumed when modeling the check valve was appropriate for the generic slanted-seat check valve selected for this project. Use dynamic check valve characteristics data provided by any manufacturer for the slanted-seat check valves or use the dynamic characteristics curves shown in Figure H.16.
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