Quick answer: The right VRU supplier is the one whose design is built on your actual vapor data, who guarantees a recovery performance you can measure, who certifies the package to the relevant standards (ATEX, pressure equipment), and who can support it with service and spares over its life. Ask for the design basis, the performance guarantee and how it is verified, the certifications, the turndown, the maintenance and spares plan, and references on similar duties. An independent assessment of your vapor load before you buy is the cheapest insurance against buying the wrong unit.
Key figures at a glance
- Selection criteria: proven recovery efficiency, references, aftersales support
- Check: recovery method fit (adsorption/absorption/condensation) to your vapour
- Check: turndown, footprint, and safety design (explosive vapour)
- Check: guarantees on VOC capture and uptime
- Support: commissioning, spares, and maintenance capability
A VRU is a long-lived asset that either quietly recovers product for years or becomes a maintenance headache that keeps venting. The difference is set at purchase. These are the questions that separate a supplier selling a box from one delivering recovery.
What to look for in a VRU supplier
Beyond price, weigh the design competence (do they size on your data or a catalogue?), the strength and verifiability of the performance guarantee, the certifications, and the after-sales support. A slightly higher capital cost with a real guarantee and local service usually beats a cheaper unit that under-recovers or sits idle waiting for spares.
Questions about design basis and guarantees
The design basis is everything, so ask directly:
- What vapor data will you size on? The unit should be sized on your working, breathing, and flash vapor at peak rate — not a generic assumption.
- What recovery performance do you guarantee, and how is it verified? A guarantee you cannot measure in the field is not a guarantee.
- What turndown does the unit provide? Confirm it covers your minimum-to-peak vapor range without short-cycling or pulling vacuum.
- How is vacuum protection implemented? The shutdown logic that stops the unit before vacuum is safety-critical.
Certifications and safety (ATEX, pressure)
A VRU handles flammable vapor in a classified area, so certification is not optional. Confirm the package meets ATEX requirements for the hazardous area, that pressure-containing components comply with the relevant pressure-equipment rules, and that the controls and safety devices are certified for the duty. Ask to see the documentation, not just a claim.
Service, spares and remote support
A VRU that recovers nothing while it waits for a part is a liability. Ask about the maintenance plan, spares availability and lead times, the availability of local service engineers, and whether remote monitoring is offered. On remote sites especially, support response time can matter more than the machine’s spec sheet.
Why an independent assessment before purchase pays off
The most common cause of a disappointing VRU is a design based on the wrong vapor estimate — and the supplier selling the unit has little incentive to challenge the numbers that justify the sale. An independent assessment of the real vapor load, gas composition, and pressures gives you a design basis you can hold every bidder to, and a benchmark to verify the delivered performance against. It typically costs a fraction of the unit and prevents the far larger cost of buying the wrong one.
A buyer’s checklist for selecting a VRU supplier
Choosing a vapour recovery unit supplier is really about matching a proven recovery technology to your specific vapour, and being able to verify what you get. The first question is whether the supplier’s recovery method — carbon-bed adsorption, absorption, or condensation — actually suits your vapour composition, flow, and temperature, rather than being a one-size-fits-all package. Ask for the guaranteed VOC recovery efficiency and how it is demonstrated on acceptance.
The second question is fit to your site: footprint and weight (critical offshore and on congested terminals), turndown for variable or intermittent loading, and the safety design for handling vapour in the explosive range. The third is lifecycle support — commissioning, spares availability, and maintenance capability — because a VRU that cannot be serviced quickly becomes an emissions liability the moment it drifts off target.
A useful safeguard for buyers is an independent pre-purchase vapour assessment: characterising the actual vapour load first means the unit is specified to what the site genuinely needs, and gives an objective basis for holding the supplier to their recovery guarantee.
Total cost of ownership, not just purchase price
The lowest-priced VRU is rarely the cheapest to own, and a buyer who compares only capital cost usually pays for it later. The running cost is dominated by energy (compression and, for adsorption, regeneration), by maintenance of the compressor and recovery media, and by the cost of any downtime during which the site is out of compliance or losing recoverable product. A unit that is slightly more expensive but reaches higher recovery efficiency and better reliability often has a markedly lower total cost of ownership.
Against those costs sits the value of recovered product: a VRU that captures 95-99%+ of otherwise-lost hydrocarbons returns saleable material continuously, so higher recovery efficiency is revenue, not just compliance. That is why the recovery guarantee, and how it is demonstrated on acceptance, belongs at the centre of the buying decision.
The disciplined approach is to evaluate suppliers on lifecycle economics — capital, energy, maintenance, expected uptime, and recovered-product value — with the vapour load independently characterised so every quote is answering the same specification. That turns a purchase into an investment decision rather than a price comparison.
Frequently asked questions
How do I choose a vapor recovery unit manufacturer?
Choose on design competence, a verifiable performance guarantee, proper certification (ATEX, pressure equipment), and after-sales service and spares — not on price alone. Insist the unit is sized on your actual vapor data at peak rate.
What certifications should a VRU have?
A VRU should meet ATEX requirements for its hazardous area, comply with the relevant pressure-equipment rules for its pressure-containing parts, and have certified safety controls. Ask for the documentation.
Should I get an independent review before buying a VRU?
Yes. An independent assessment of your real vapor load gives you a design basis every supplier must meet and a benchmark to verify performance, for a fraction of the unit’s cost — and it is the best protection against buying an incorrectly sized unit.
Related Rodanco resources: See Rodanco’s vapour recovery unit overview, and consider independent VRU consulting to specify and verify a purchase.
Where Rodanco fits: Rodanco provides independent VRU consulting and pre-purchase vapor assessments, so operators buy the unit their site actually needs and can verify what they get. See our Vapour Recovery Unit and VRU consulting pages, or arrange a consultation through the Rodanco contact page.