Basics

A device for compressing combustible gasses {Hydrogen, Syngas, Natural gas/Methane) from low or near atmospheric pressure, to high pressur for storage
This does not do much cleaning of the gas,outside of a small failsafe
It need clean inputs such as from a Biogas Upgrader
Uses a Diaphram Pump or an Ionic Liquid Piston Based Gas Compressor

Industry Standards

BÜHLER Models (Diaphram or peristalic? it says "bellows") ]
[https://www.toolots.com/1-aluminum-alloy-air-operated-double-diaphragm-pump-made-in-taiwan-c12943-ds10-aat-tats-02.html?cid=1469602971&gclid=Cj0KCQiAvc_xBRCYARIsAC5QT9mBMk5eLzu-KAeHLiguflSeeZuwijmtLbEQi1fyRs_NtiT6PItiVNcaAmf0EALw_wcB Diaphram Pump ~600 USD, can pump liquid flammibe fuels (gas too then?)
A Site Selling High Pressure "Gas Boosters" (supposedly used to compress low pressure (yet still slightly higher than ambient) gas to high pressure for either scientific use, or for bottle filling. Does it work with combustables, and/or hydrogen? (Hydrogen tends to leak due to it's size allowing it to diffuse even through metals)