Can a poisoned bed be restored in place?

Sometimes. If the poison is water or weakly-bound hydrocarbons, extended TSA regeneration (300°C, 12 hours) can recover 60 to 80% of capacity. If the poison is polymerized hydrocarbons or amines, the bed must be replaced.

How do I know if poisoning is happening vs. normal aging?

Compare your operating data year-over-year. If breakthrough time drops by more than 10% per year or delta-P rises by more than 15% per year, accelerated poisoning is likely.

Is there a poison-resistant sieve grade?

Not exactly. Different grades tolerate different poisons (3A tolerates H2S better than 13X; 13X tolerates CO2 better than 4A). But the fix is always pretreatment, not sieve selection.

What is the cost of a 1 MT sieve bed?

Depending on grade: $4,000 to $7,000 per MT for 4A, $5,000 to $8,000 for 13X. Bulk discounts apply above 10 MT.

Can I reuse a partially poisoned bed in a less critical service?

Sometimes. A 4A bed that has dropped to 60% of original capacity in hydrogen service may still perform adequately in compressed air drying. Talk to our engineers before redeploying.