Must skid-mounted pressure equipment include pressure vessels?

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I’d like to ask everyone for advice. According to the definitions of online inquiries provided by the General Administration of Quality Supervision, Inspection and Quarantine below, skid-mounted pressure-bearing equipment seems to require a pressure vessel. If it is a gas distribution device attached to a piece of equipment, and its dimensions and pressure meet the standards for pressure pipelines, can it be designed and manufactured in a skid-mounted format? The main difficulty is that, due to space constraints at the installation site, this device cannot be placed on the same base as the equipment; instead, it must be connected to it via pipes on-site. Online consultation on the General Administration’s website, 20161017_13597650: A modular pressure-bearing equipment system is a device system that consists of containers and pipes connected together to form a single unit before being shipped. Online consultation on the General Administration’s website, 20160224: Modular equipment refers to devices in which pressure vessels, pressure pipes, power equipment, instruments, valves, etc. are installed (assembled) onto a modular frame