Conveyor Mechanics

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Example of a conveyor network between multiple inventories
Example of a medium cargo container, showing the large and small conveyor ports


The conveyor network by definition, is the act of transferring of items between devices within the game. This can be achieved by either connecting devices next to each other through conveyor ports, or through the use of conveyor blocks.


Currently, as of Update 01.073, it is possible to determine where the conveyor network stores or deposits items through the use of Conveyor Sorter blocks. With these, the player may control which inventories the network should pull from, where to store them, etc. Additionally, the player can make manual transfers over the conveyor network and can toggle whether or not certain blocks are connected to the network.
Use Conveyor System.png

However, it should be noted that this toggle is not available for all devices such as cargo containers.


Quoted from George Mamakos.[1]

This text is purely illustrational and cannot be taken for a design document or hard-coded rules that won't ever change. On the contrary - as we keep working on the game and making it better, a lot of the information here might become obsolete.

Conveyor Push-n-Pull principles

Some of the blocks (e.g. assembler, turrets, etc.) that can be connected to the conveyor system can automatically "push" or "pull" items to/from the conveyors. This works as follows:

  1. If the block is set to use the conveyor system, it checks certain conditions when it is necessary (which are different for each block type) that say whether it should send a push/pull request.
  2. If the conditions for the request are met, the block finds another block with inventory that can satisfy the request.

Push Request

  1. If the block sends a push request, it finds a suitable remote inventory, which has the CanReceive flag set. Once the inventory is found, the request is fulfilled by sending the requested items to the remote inventory.
  2. If the remote inventory does not have enough free space, only a part of the request is fulfilled and the request continues by searching for another remote inventory.

Pull Request

  1. If the block sends a pull request, it finds a remote inventory with the CanSend flag set. The remote inventory also has to contain the desired items.
  2. If these conditions are met, the request is fulfilled by transferring the items from the remote inventory.

Inventories with CanSend flag

  • Cargo container inventories
  • Assembler output inventory
  • Refinery output inventory
  • Ship drill inventory
  • Ship grinder inventory
  • Collector inventory
  • Connector inventory

Inventories with CanReceive flag

  • Cargo container inventories
  • Assembler input inventory
  • Refinery input inventory
  • Reactor inventory
  • Turret & gun inventories
  • Connector inventory

Requests of the individual block types

  • Assembler:
- If the input inventory is less than 60% full, the assembler issues a pull request for the needed materials according to the current blueprint
- If the output inventory is more than 75% full, the assembler issues a push request for its contents.
  • Refinery:
- See assembler; Refinery works similarly
  • Collector:
- Sends push requests for all of its contents
  • Reactor:
- If the fuel inventory is less than 60% full, sends pull request for some small amount of fuel
  • Turrets and ship guns:
- If their inventories ar less than 50% full, they send pull requests for ammo
  • Ship drill & ship grinder:
- Send push requests for all of their contents

Power Usage

Conveyors use 20 Watts (20 W) for every interface in use, both for Large Grids and Small Grids. This means for a Curved Conveyor Tube, and a Conveyor Tube, when both ends are connected the tube piece will draw 40 W - 20 W for each end. When connecting to a Conveyor or a Small Conveyor, it will use 20 W for each connected face - at minimum 20 W (because Conveyors are considered an "end", and will terminate a conveyor line), but as much as 120 W when all six sides are connected.

There is no way to turn off this requirement - conveyors always require power. Turning off the "Use Conveyor System" on anything attached to the conveyor network does not affect this power requirement (eg Arc Furnace, Refinery, Oxygen Generator, etc). For all the examples just mentioned (except the Arc Furnace), each item has four Conveyor ports on it, so each can consume between 20 and 80 W of power via the Conveyor system - depending on how many ports are hooked up and functioning.

Any conveyor system (Tubes and Curved Tubes) which is not properly terminated (the conveyor tube lights are red), it will not consume any power until it is properly hooked up.

Conveyor blocks

The conveyor blocks are more or less "pipes" that can be placed between devices when direct connections are impossible. In other words, conveyors are pipeline blocks the player can place to connect one inventory to another. The style in which players place the conveyors is completely up to them. The only requirement needed to establish a connection is by having two inventories on either end of the network.

List of conveyor blocks

The blocks listed below only function as conveyor and have no other purpose.

Large Conveyors

Small Conveyors

Conveyor ports

Conveyor ports are the input/output slots that conveyors and/or other devices may connect to in order to allow items to be transferred to another inventory.

Small port

Small conveyor ports are small, and do not allow objects larger than the ports themselves through.


Items that can transfer through small ports

Any item whose Size does not exceed 0.25 m in any direction:[2]

AutoCanonShellBox Icon.PNG Autocannon Magazine 
MR-20 Magazine Icon.png MR-20 Rifle Magazine 
Pistol Elite Warfare Ammo Icon.PNG S-10E Pistol Magazine 
Pistol FullAuto Warfare Ammo Icon.PNG S-20A Pistol Magazine 
MediumCalibreShell Icon.PNG Assault Cannon Shell 
25x184mm NATO Ammo Container Icon.png Gatling Ammo Box 
5.56x45mm NATO Magazine Icon.png 5.56x45mm NATO magazine 
Rifle Ammo Precise Icon.PNG MR-8P Rifle Magazine 
Rifle Ammo RapidFire Icon.PNG MR-50A Rifle Magazine 
Pistol Warfare Ammo Icon.PNG S-10 Pistol Magazine 
RailgunAmmo Icon.PNG Small Railgun Sabot 
Rifle Ammo Elite Icon.PNG MR-30E Rifle Magazine 
Canvas Icon.png Canvas 
Computer Icon.png Computer 
Construction Component Icon.png Construction Component 
Plushie Icon.PNG Engineer Plushie 
Explosives Icon.png Explosives 
Motor Icon.png Motor 
Reactor Components Icon.png Reactor Components 
SabiroidPlushie Icon.PNG Saberoid Plushie 
Thruster Components Icon.png Thruster Components 
Zone Chip Icon.png Zone Chip 
Cobalt Ingot Icon.png Cobalt Ingot 
Gold Ingot Icon.png Gold Ingot 
Iron Ingot Icon.png Iron Ingot 
Magnesium Powder Icon.png Magnesium Powder 
Nickel Ingot Icon.png Nickel Ingot 
Platinum Ingot Icon.png Platinum Ingot 
Silicon Wafer Icon.png Silicon Wafer 
Silver Ingot Icon.png Silver Ingot 
Gravel Icon.png Gravel 
Uranium Ingot Icon.png Uranium Ingot 
Cobalt Ore Icon.png Cobalt Ore 
Gold Ore Icon.png Gold Ore 
Ice Icon.png Ice 
Iron Ore Icon.png Iron Ore 
Magnesium Ore Icon.png Magnesium Ore 
Nickel Ore Icon.png Nickel Ore 
32px Organic 
Platinum Ore Icon.png Platinum Ore 
Scrap Metal Icon.png Scrap Metal 
Silicon Ore Icon.png Silicon Ore 
Silver Ore Icon.png Silver Ore 
Stone Icon.png Stone 
Uranium Ore Icon.png Uranium Ore 

Small to Large port Incompatibilities

Players should be aware when using the conveyors that small ports & large are not compatible! You can not fit a smaller conveyor into a larger port, and a large into small port.

Bad conveyor port connection to a medium cargo container
Good conveyor port connection to a medium cargo container
Good conveyor port connection to a small ship drill
Bad conveyor port connection to a small ship welder

Large port

Large ports are larger in size, and can allow all item types to transfer through them.





  1. Forum thread: Explanation of pull & push principles in conveyor system Retrieved 9/4/2014. Url moved in August 2020.
  2. Sandbox.Game.dll Sandbox.Game.GameSystems.MyGridConveyorSystem.NeedsLargeTube(MyDefinitionId) Dated 2020-07-02