Recap industry

This week was about industry with risk: a drill that eats power, a mixture that burns, tanks that can burst. What connects all three is a safety chain.

What a safety chain is#

A plant may only run when all conditions are met. Every condition is a link. If a link is open, the plant stands still – without exception. For filling fuel that means:

Showing the first open spot#

“The pump is not running” is a bad message. “Link 3 open” is a good one. The display shows the number of the most important open link. For that the chip checks from back to front – the link checked last wins:

select code tmp L_MIX code
select code tmp L_PRESS code
select code fire L_FIRE code
select code tmp L_MISSING code

If something burns and at the same time the mixture is wrong, the display shows 2: the fire is more important.

Mining, fuel and pressure together#

The chain can be extended at will. The deep miner from this week would get a link “battery above 25 %” and one “no jam”. A furnace would get “pressure in the furnace below the emergency limit”. The rule stays the same: check everything, report the first open spot, only run at 0.

Typical mistakes of the week#

• Mixture set by percent, but the temperatures of the inputs forgotten.
• A fire alarm that resets itself when the fire has suffocated.
• Tank filled up to the limit without thinking of the midday heat.
• A missing sensor counted as “all good”.