- Primary keyword: ostranauts eva oxygen refill requires a pump, vessel placement, and careful pressure control.
- Best setup: Use a standard pump for slower, more manageable transfers into EVA bottles.
- Safety rule: Watch bottle pressure closely because overpressurization can damage or rupture the container.
- Ship protection: Remove the vessel when you want the pump to regulate compartment atmosphere again.
- Resource tip: Refilling containers from ship oxygen can cost less than buying full replacements.
ostranauts EVA Oxygen Refill Basics
In Ostranauts, EVA oxygen bottles and larger oxygen canisters can be refilled through a ship air pump. The important mechanic is vessel targeting: when a bottle or canister is positioned beneath the pump outlet, the pump transfers gas into that container instead of treating the compartment as its primary destination.
This makes the pump useful for both EVA oxygen refill and general atmosphere management. The same basic process applies to oxygen bottles, oxygen canisters, and nitrogen vessels, although smaller bottles require more careful monitoring because their pressure changes quickly.
Video Highlights:
- How to position an oxygen bottle or canister beneath a pump
- Why standard pumps provide better control than turbo pumps
- How automatic and reverse modes affect pressure movement
- Why an obstructed pump outlet can prevent oxygen from entering the ship
- How overfilling an EVA bottle can cause serious container damage
Standard Pump
- Best for control
- Slower pressure changes
- Easier for EVA bottles
Turbo Pump
- Faster transfer rate
- Less adjustment time
- Higher overfill risk
Oxygen Bottle
- Smaller vessel
- Fills quickly
- Needs close monitoring
Oxygen Canister
- Larger capacity
- More forgiving transfer
- Slower near empty pressure
Place the oxygen bottle or canister under the pump outlet before changing the pump controls. If the vessel blocks the outlet, the pump may fill it instead of regulating the ship’s compartment.
| Component | Main Function | Control Difficulty | Best Use |
|---|---|---|---|
| Standard pump | Moves gas between atmosphere and vessels | Moderate | EVA bottles and careful refills |
| Turbo pump | Transfers gas faster | High | Large canisters when closely supervised |
| EVA oxygen bottle | Supplies oxygen during extravehicular activity | High | Short EVA operations |
| Oxygen canister | Stores a larger gas supply | Moderate | Stockpiling or repeated transfers |
Step-by-Step EVA Oxygen Refill Setup
The safest refill begins with a clear pump outlet and a bottle that you can inspect repeatedly. Avoid treating the process like a simple shopping replacement. A refill preserves the container and lets you control how much oxygen is moved, but the pressure transfer needs supervision.
Inspect the Bottle and Pump
Check the EVA bottle’s condition and current oxygen level. Confirm that the bottle is not already damaged, then open a nearby standard air pump. Make sure the pump outlet is accessible and not occupied by another vessel or obstruction.
Place the Bottle Under the Outlet
Move the oxygen bottle beneath the pump outlet. The pump should now recognize the bottle as the vessel receiving or releasing gas. If the pump still displays the compartment as its target, reposition the bottle and check the outlet again.
Select a Controlled Pump Mode
Open the pump control panel. Use the appropriate gas setting for oxygen, keep the transfer on a manageable speed, and use slow mode when working with a small EVA bottle. Standard pump operation is easier to regulate than turbo transfer.
Start the Refill and Watch Pressure
Turn the pump on and monitor the bottle’s percentage and pressure. Stop the transfer before the container reaches an unsafe pressure. Small bottles can jump upward in pressure quickly, even when slow mode is active.
Remove the Bottle and Restore Atmosphere Control
Turn the pump off before moving the bottle. Once the vessel is removed, confirm that the pump has returned to compartment control. Restore automatic regulation if you were using the pump to maintain ship atmosphere.
A bottle may gain oxygen in noticeable jumps rather than in a perfectly smooth progression. Lowering game speed can give you more time to react, especially when the bottle is approaching its pressure limit. The goal is a usable oxygen reserve, not necessarily the highest possible percentage.
| Step | Pump Target | Recommended Action | Main Risk |
|---|---|---|---|
| 1 | Pump outlet | Inspect equipment and clear obstructions | Missing a damaged bottle |
| 2 | Oxygen bottle | Place it directly beneath the outlet | Pump still targets the compartment |
| 3 | Vessel control | Use standard speed or slow mode | Transfer becomes difficult to stop |
| 4 | Bottle pressure | Watch percentage and condition | Overpressurization |
| 5 | Compartment | Remove bottle before restoring auto mode | Atmosphere control remains redirected |
For routine refills, use a standard pump, slow the game when the bottle approaches its limit, and stop before maximum pressure. This gives you a safer margin than trying to fill every last unit.
Pressure Safety and Damage Prevention
Pressure management is the most important part of an Ostranauts EVA oxygen refill. A bottle can be fully repaired while holding very little gas, so condition and fill percentage should be treated as separate checks. Repairing the container does not mean it is safe to refill without supervision.
Overpressurization can visibly damage the bottle and may lead to a rupture. Warning sounds or cracking effects indicate that the container is under severe stress. If this begins, shut down the transfer immediately and allow the pressure situation to stabilize before attempting repairs.
Safe Behavior
- Slow the game near the target level
- Watch pressure and condition
- Stop before the limit
Risky Behavior
- Leaving a small bottle unattended
- Using turbo transfer without control
- Chasing a perfect fill percentage
Recovery Behavior
- Turn the pump off
- Check for damage
- Repair before the next EVA
The transfer also affects the ship’s atmosphere. When a bottle is being filled, oxygen is drawn from the surrounding compartment. When a bottle or canister is emptied into the ship, the compartment pressure can rise instead. Use the pump’s reverse function carefully and check the compartment afterward.
| Situation | What the Pump Does | What to Monitor |
|---|---|---|
| Bottle under outlet, forward transfer | Moves oxygen into the bottle | Bottle pressure and condition |
| Bottle under outlet, reverse transfer | Pulls oxygen from the bottle | Compartment oxygen and pressure |
| No vessel under outlet, automatic mode | Regulates the compartment | Ship atmosphere |
| Outlet blocked unexpectedly | May redirect gas into the obstruction | Pump target and oxygen flow |
| Turbo transfer active | Moves gas rapidly | Pressure spikes and damage |
A nearly full bottle is often more useful than a damaged bottle. Stop the pump when the oxygen reserve is sufficient for your planned EVA, rather than risking the container for a perfect fill.
Canisters, Costs, and Practical Resource Use
Oxygen canisters follow the same transfer principle as EVA bottles, but their larger capacity changes the timing. A mostly empty canister can fill relatively quickly at first, then transfer more slowly as the pressure difference decreases. Emptying a nearly depleted vessel can take considerably longer than filling it.
Buying a full replacement is convenient, but it can be expensive compared with refilling a container. In the referenced build .14 example, a full oxygen canister cost about 13,000 credits, while its resale value was approximately 3,300 credits. The exact figures can vary with game state and version, so use them as a practical comparison rather than a permanent price table.
| Container State | Example Value | Practical Meaning |
|---|---|---|
| Full oxygen canister purchase | About 13,000 credits | Convenient but expensive replacement |
| Full canister resale | About 3,300 credits | Selling loses much of the purchase value |
| Empty canister resale | About 223 credits | Reflects the container more than its gas |
| Low-fill oxygen bottle resale | About 253 credits | Small reserve adds limited value |
| High-fill oxygen bottle resale | About 3,000 credits | Gas content substantially affects value |
The same example indicates that oxygen value generally tracks the amount of gas remaining in a container. A bottle at roughly half capacity sells for less than a high-fill bottle, while the physical container contributes a separate base value.
Buying oxygen directly for a ship can also be more economical than repeatedly buying full canisters, depending on the available equipment and the current market. However, a refill loop requires moving vessels, managing pressure, and spending time on the pump. The best choice depends on whether you value credits, convenience, or preparation speed.
Buy a Full Container
- Fastest immediate option
- Minimal setup
- Poorer long-term value
Refill Existing Gear
- Preserves the container
- Better resource efficiency
- Requires pump supervision
Use Ship Oxygen
- Supports atmosphere management
- Can supply bottles and canisters
- Requires careful pressure balance
The credit figures are tied to the observed build .14 example. Check your current market values before planning a large oxygen resale operation, because prices and balances may change.
Troubleshooting and EVA Refill Checklist
Most refill failures come from a small number of setup mistakes: the bottle is not correctly positioned, the pump is still targeting the compartment, the pump is turned off, or the transfer speed is too aggressive. Check the pump panel after every movement so you know where the gas is going.
Before Leaving the Ship:
- Inspect the EVA bottle’s condition and oxygen percentage
- Confirm the pump recognizes the intended bottle or canister
- Use a controllable transfer mode for small vessels
- Monitor pressure during the entire refill
- Remove the vessel and restore compartment atmosphere control
| Problem | Likely Cause | Fix |
|---|---|---|
| Bottle does not fill | Pump is off or target is incorrect | Reopen controls and verify the vessel target |
| Ship oxygen is not increasing | Bottle blocks the pump outlet | Remove or reposition the vessel |
| Bottle pressure rises too quickly | Transfer speed is too high | Use slow mode or reduce game speed |
| Container becomes damaged | Overpressurization | Stop the pump, stabilize, then repair |
| Emptying takes too long | Small pressure difference | Allow more game time or use a suitable pump |
| Atmosphere becomes unsafe | Gas was redirected or over-transferred | Check pump mode and compartment pressure |
When preparing for EVA, leave enough time to inspect the bottle after refilling. A bottle that appears repaired may still contain only a small oxygen reserve. Likewise, a high percentage is not useful if the container has taken damage during the process.
Q: How do you perform an Ostranauts EVA oxygen refill?
Place an oxygen bottle under a standard pump outlet, select the appropriate oxygen transfer mode, turn the pump on, and monitor pressure until the bottle has a safe reserve. Stop the pump before overpressurization, then remove the bottle and restore compartment control.
Q: Why is my pump filling the bottle instead of the ship?
A bottle or canister may be blocking the pump outlet. When a vessel is positioned beneath the outlet, the pump can redirect gas into that vessel. Remove it when you want automatic atmosphere regulation to target the compartment again.
Q: Can an EVA oxygen bottle explode from overfilling?
Overpressurization can badly damage a bottle and may lead to a rupture. Use slow mode, reduce game speed near the target pressure, and stop the transfer before the container reaches an unsafe level.
Q: Is refilling cheaper than buying a full oxygen canister?
Refilling an existing container can preserve more value than repeatedly buying replacements. The observed build .14 example showed a large difference between full purchase and resale prices, but current prices may vary.
Before an EVA, verify three things: the bottle contains enough oxygen, its condition is intact, and the ship pump has returned to normal compartment control.