🫙 Propellant Tank Sizing Calculator

Tank volume with ullage · spherical diameter · tank mass estimate

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Inputs

Results

Propellant volume
– L
Tank volume (with ullage)
– L
Volume per tank
– L
Spherical diameter / tank
– cm
Tank mass estimate
– kg
Loaded system mass
– kg
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📖 How to use

  1. Bring the propellant mass (plus 2–5% residuals) from the Propellant tool and pick the propellant — storage density auto-fills.带入推进剂工具的推进剂质量（加 2–5% 残留），选推进剂种类——贮存密度自动填入。
  2. Set ullage: regulated liquid systems 5–10%; blowdown monoprop needs 25–50% gas volume; high-pressure gas tanks size on pressure, not ullage.设置气垫比例：调压液路 5–10%；落压单组元需 25–50% 气体容积；高压气瓶按压力而非气垫定容。
  3. Biprop systems: run the tool twice (fuel and oxidizer at ~1.6 O/F mass ratio) or use the preset.双组元系统：燃料与氧化剂（质量混合比约 1.6）各算一次，或用预设。
  4. The spherical diameter is the envelope driver — check it against your structure early; the tank is often the biggest single box in a smallsat.球罐直径是包络约束——尽早与结构核对；贮箱常是小卫星里最大的单件。

Tank sizing relations

V_tank = m_p/ρ × (1 + ullage); spherical diameter d = (6V/π)^(1/3) per tank.

Tank mass scales primarily with contained pressure-volume: light liquid tanks come in near 10% of the propellant mass, while 150–300 bar COPVs for xenon or cold gas run 50–100%. Xenon stores supercritically at ~1.6 g/cm³ at 150 bar — dense but pressure-hungry.

All computation runs locally in your browser.

贮箱设计关系式

V_箱 = m_p/ρ × (1 + 气垫)；单箱球径 d = (6V/π)^(1/3)。

贮箱质量主要随压力×容积增长：轻质液体贮箱约为推进剂质量的 10%，而氙气/冷气用的 150–300 bar 复合气瓶可达 50–100%。氙在 150 bar 下超临界贮存，密度约 1.6 g/cm³——密度高但耗压力容器。

全部计算在你的浏览器本地完成。