ECS Quick Reference Data
Atmosphere revitalization section (ARS) |
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| Cabin pressure | 4.8 ± 0.2 psia (normal, steady-state) | ||
| Suit circuit pressure | |||
| Cabin mode | 4.8 ± 0.2 psia (may exceed 5.0 psia during powered flight) | ||
| Egress mode | 3.8 ± 0.2 psia (4.7 psia maximum during powered flight) | ||
| Suit inlet temperature range | With suit temperature control valve in full cold position, temperature ranges from +38 F to +65 F; in full hot position, from +42 F to 100 F. | ||
| Cabin temperature | +55 F to +90 F | ||
| Relative humidity | 40% to 80% | ||
| Suit circuit fan flow | At 4.8 psia - 36.0 pounds per hour (minimum) At 3.8 psia - 28.4 pounds per hour (minimum) |
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Oxygen supply and cabin pressure control section (OSCPCS) |
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| Suit pressure increase | First 1-psi increase may occur in less than 1 second. Each succeeding 1 -psi increase occurs in not less than 8 seconds. | ||
| Cabin repressurization and emergency oxygen valve delivery rate | |||
| Descent mode | 4 pounds per minute (maximum) | ||
| Ascent mode | 8 pounds per minute at 700 psia | ||
| PLSS refill | 0.91 pound/refill at 850 psia; can only be partially filled at lower pressures | ||
| Cabin volume | 235 cubic feet | ||
| Dump valve bacteria filter efficiency | Removes 95% of all bacteria larger than 0.5 micron | ||
| Manual cabin pressure dump rate (without oxygen inflow) | Dump valve in forward hatch, with bacteria filter, from 5.0 psia down to 0.08 psia in 310 seconds; overhead hatch, without filter, in 180 seconds; both valves, without filter, 90 seconds (Bacteria filter only flown on Apollo 11.) | ||
| Number of cabin repressurizations | 4 at 6.6 pounds each | ||
| Cabin repressurization time | 2 minutes | ||
| Cabin pressure switch settings | When cabin pressure drops to 3.7 to 4.45 psia, contacts close. When cabin pressure increases to 4.40 to 5.0 psia, contacts open. |
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| Descent oxygen tank | |||
| Capacity | 48.01 pounds at 2,730 psia and +700 F (residual oxygen: 1.0 pound) |
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| Burst pressure | 4,500 psia | ||
| Ascent oxygen tanks | |||
| Capacity | 2.43 pounds (each tank) at 854 psia and +80 F (residual oxygen: 0.14 pounds (each tank) at 50 psia and +70 F | ||
| Burst pressure | 1,500 psia | ||
| Bypass relief valve | |||
| Full flow pressure | 3,030 psig (minimum) at +75 F | ||
| Cracking pressure | 2,875 psig (maximum) at +75 F | ||
| Reseat pressure | 2,850 psig (minimum) at +75 F | ||
| Overboard relief valve | |||
| Full flow pressure | 1,090 psig (maximum) at +75 F | ||
| Cracking pressure | 1,025 psig (minimum) at +75 F | ||
| Reseat pressure | 985 psig (minimum) at +75 F | ||
| High-pressure regulator | |||
| Outlet pressure with primary and secondary regulators operating normally | At inlet pressure of 1,100 to 3,000 psig and flow of 0. 1 to 4.0 pounds per hour, and inlet pressure of 975 to 1,100 psig and flow of 0.1 pound per hour, will regulate to 875 to 960 psig at 75 F | ||
Water management section (WMS) |
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| Descent water tank | |||
| Capacity | 333 pounds at 0.75 fill ratio | ||
| Initial fill pressure | 48.2 psia (maximum) at +80 F | ||
| Residual water | 6.66 pounds | ||
| Pressure upon expulsion of all expellable water | 11.0 psia (minimum) at +35 F | ||
| Ascent water tanks | |||
| Capacity | 42.5 pounds (each tank) at 0.75 fill ratio | ||
| Initial fill pressure | 48.2 psia (maximum) at +80 F | ||
| Residual water | 0.85 pound (each tank) | ||
| Pressure regulator discharge pressure | 0.5 to 1.0 psi above ARS gas pressure | ||
| PLSS refill (each) | 9.15 pounds of water | ||
Heat transport section (HTS) |
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| Coolant | Solution of ethylene glycol and water (35% and 65%, respectively, by weight) with inhibitors. Approximately 35 pounds of coolant is used in HTS. | ||
| Coolant slush point | -3 F | ||
| Coolant pump rated flow |
Flow rate of 222 pounds per hour (minimum) at +40 F, 30 psid, and 28-vdc input voltage | ||
| Coolant pump bypass relief valve | |||
| Cracking pressure | 33 to 36 psi | ||
| Fully open pressure | 39 psi | ||
| Reseat pressure | 1 psi less than cracking | ||
| Coolant temperatures | +29 F to +120 F | ||
| Flow into primary sublimator | +110 F (maximum) | ||
| Flow out of sublimator | +29 F to +36 F | ||
| Flow into secondary sublimator | +60.1 F'(minimum) | ||
| Flow out of sublimator | +47 F (maximum) | ||
| Vacuum fill requirements | HTS withstands internal pressure of 500 microns in sea-level ambient pressure environment. | ||
| Primary and secondary coolant filters | |||
| Efficiency | 35 microns absolute for primary; 45 microns absolute for secondary |
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| Maximum bypass valve cracking pressure | 0.4 psid for primary; 1.0 psid for secondary | ||
| Coolant flow | |||
| Primary coolant loop | 222 pounds per hour (minimum) | ||
| Secondary coolant loop | 222 pounds per hour (minimum) | ||
| Cold plates | |||
| Coolant inlet operating temperature | +32 F to + 100 F | ||
| Coolant inlet operating pressure | 5 to 45 psia | ||
| Coolant inlet operating flow | 12 to 85 pounds per hour, depending on cold-plate size | ||