Zwick 540K — 540,000 gal Gas Fired Vaporizer

What steam supply — pressure and rate — does this unit require?

This is a gas-fired vaporizer, not a steam vaporizer — it uses combustion of natural gas or propane to provide the heat for vaporization. Gas-fired units require fuel supply and combustion air but no steam infrastructure, which makes them suited for sites without high-pressure steam or where steam availability is limited. The listing does not specify fuel consumption rate or required gas supply pressure for this unit.

What condition are the coil and shell in, and how would I verify that?

The listing states the unit has been inspected but condition details are limited, with no specific information on coil or shell condition provided. For verification, you should request ultrasonic thickness testing reports on the pressure boundary, visual inspection records of the tube bundle or coil for corrosion or damage, and hydrostatic test results if available. Internal inspection of the vaporization chamber and pressure testing are standard practice for assessing fired equipment removed from service.

What should I check before putting a used steam vaporizer into service?

This is a gas-fired vaporizer, not steam-heated, so combustion system inspection is critical: verify burner condition, flame safety controls, gas train components, and combustion chamber integrity. Pressure boundary inspection should include hydrostatic testing to the rated 10,000 PSIG (or per code requirements), UT thickness measurements on pressure-containing components, and internal inspection for corrosion, erosion, or mechanical damage. Depending on jurisdiction and original code construction, the unit may require re-certification or new relief device sizing calculations before returning to service.