Application guide

Storage Tank H₂S Scavenger — Vapor-Space Control

Crude oil, fuel oil, asphalt and bitumen release hydrogen sulfide into storage-tank vapor space, where it can reach dangerous concentrations during gauging, sampling and loading. Triazine H₂S scavengers suppress that vapor-phase H₂S to protect workers and reduce odour and corrosion.

Quick answer: triazine reacts out the H₂S evolving into a tank's headspace, lowering vapor-phase concentration. MMA Triazine 40% suits hot asphalt/bitumen tanks (soluble by-products); MEA Triazine 78% suits crude/fuel-oil tanks. It complements — never replaces — gas monitoring, PPE and ventilation.

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High-Risk Tank Activities

  • Manual gauging, sampling and temperature checks
  • Loading / unloading and roof or manway work
  • Asphalt and bitumen hot storage
  • Crude and fuel-oil terminals and tank farms

One Layer of H₂S Safety

Vapor-space scavenging lowers the chemical hazard, but must sit alongside personal gas monitors, PPE, ventilation and safe-work procedures. Dose to the measured H₂S evolution and monitor results.

Related Reading

Frequently Asked Questions

Why does H2S build up in storage tank vapor space?+
H2S partitions out of stored crude, fuel oil, asphalt or bitumen and accumulates in the tank vapor space (headspace). Concentrations there can spike dangerously — a serious exposure risk during gauging, sampling, loading and roof/manway work — so the vapor space is treated to keep H2S below safe limits.
How does triazine control tank vapor-space H2S?+
Triazine H2S scavenger is applied to the liquid or dosed so it reacts with the H2S evolving into the headspace, converting it to stable, non-volatile products. This lowers vapor-phase H2S concentration, protecting personnel and reducing odour and corrosion of the tank and vents.
Which triazine grade is best for hot asphalt/bitumen tanks?+
Hot asphalt and bitumen storage favours a grade whose reaction by-products remain soluble to avoid solids — often MMA triazine 40%. For crude and fuel-oil tanks, MEA triazine 78% provides high active content for cost-effective vapor-space suppression. Grade is matched to temperature and product.
Is a vapor-space scavenger a substitute for gas monitoring and PPE?+
No. Chemical H2S suppression reduces the hazard but does not replace personal gas monitors, PPE, ventilation and safe-work procedures. It is one layer of a complete H2S management program for tank operations.
How much triazine is needed for a storage tank?+
Dose is set by the H2S evolution rate and vapor-space concentration target, not a fixed percentage — it depends on product, temperature, throughput and tank turnover. Dose to the measured H2S and monitor; we can recommend a starting rate for your tank.
Do you supply triazine for terminals and tank farms?+
Yes. Vasudev Chemo Pharma manufactures MEA Triazine 78% and MMA Triazine 40% and exports globally with batch COA and application guidance for crude, fuel-oil and asphalt storage-tank H2S suppression.

Controlling H₂S in storage tanks?

Vasudev Chemo Pharma supplies MEA Triazine 78% and MMA Triazine 40% with dosing guidance, batch COA, and global export from our ISO 9001:2015 certified facility in Gujarat, India.

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