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The piston must be able to supply enough force at its operating pressure to break the shear pins with a ?x safety factor. According to NASA standardsstandards established by the Aerospace Corporation, there must be a minimum ?x safety factor between this operating pressure and the design burst pressure [3].1.5 design burst factor. [4]
As of 12/27/2017, we plan on using 180lbs of shear pins, making for a desired yield force of 720lbs. This analysis makes use of thin-walled pressure vessel theory [2], paraphrased below:
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Note that this standard was cancelled in July, 2002.
[4] Aerospace Corporation, Operational Guidelines for Spaceflight Pressure Vessels