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4.2.4.2 OPTIONAL BURST PRESSURE TESTING
You can find a complete list of DTEG requirements that affect the Recovery system on the Hermes Recovery System page.
Desired Performance
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 2x the maximum design pressure, which aligns with DTEG requirement 4.2.2. [5] Then, to determine when the cylinder will burst, we make use of thin-walled pressure vessel theory [2], paraphrased below:
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