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The piston must be able to supply enough force at its operating pressure to break the shear pins with a 2x safety factor, which is the safety-critical guideline for parachute components presented by NASA (Section 3.3.1.5). The same source (Section 3.3.1.6) dictates a design burst pressure factor of 2 times 2x the maximum design pressure. [5] As of 12/27/2017, we plan on using 180lbs of shear pins, making for a desired yield force of 720lbs. This analysis makes Then, to determine when the cylinder will burst, we make use of thin-walled pressure vessel theory [2], paraphrased below:
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