> systems that involve flushing of lines such as in water or air distribution systems...

Helping references:
Air Freight – Historical Perspective, Industry Background, and Key Trends:
This document outlines the evolution and strategic aspects of air freight, which might provide insights into specific terminologies used within the air transport industry, such as handling air lines in cargo systems.
https://airportscouncil.org/wp-content/uploads/2020/03/CHAPT...

OECD - The Impacts of Globalisation on International Air Transport Activity:
Discusses the impact of globalization on air transport, which may touch on the various systems involved in air transport, including air line systems in cargo and logistics.
https://www.oecd.org/greengrowth/greening-transport/41373470...

> likely refers to specific lines within an air system that are part of a padding or cushioning process, or perhaps a safety or maintenance feature within the air distribution system of a vehicle or transport machinery...

For it's translation, if we consider pad as a verb suggesting to fill or stuff, a possible interpretation could be:
líneas de aire de relleno or líneas de aire de amortiguación

Nitrogen padding, also known as blanketing, refers to the delivery of nitrogen after the loading to reduce the oxygen content within the tank. This will maintain positive pressure and therefore prevent the ingress of air or water, which could cause unwanted reactions with the cargo or even contamination. The padding of cargo tanks protects lives, ships, and the environment, and additionally the product itself from contamination. If the cargo is combustible, the process of padding removes the oxygen inside the tank, which ensures that combustion cannot occur.

Sistemas de Blanketing
Gascat
https://www.gascat.com.br › sistema...
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Son sistemas que consisten basicamente en la retirada de oxégeno de dentro del tanque inyectando gas inerte que, en la gran parte de los casos es el Nitrógeno.
Tank Blanketing | PDF | Nature | Chemistry

Scribd
https://www.scribd.com › document › Tank-blanketing
Tank blanketing. Tank blanketing, also referred to as tank padding, is the process of applying a gas to the empty space in a storage container.

Inertización de tanques
Mankenberg
https://www.mankenberg.com › ta...
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El gaseado del tanque crea una presión positiva en el tanque, de modo que se evita la formación de gases tóxicos peligrosos para el medio ambiente. Con ..