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Sampling Hydrofluoric Acid

Sampling Hydrofluoric Acid
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BIAR Sampling Systems Sampling Hydrofluoric Acid Hydrofluoric Acid is a lethal and extremely dangerous chemical. It will destroy skin, the tissue beneath the skin and bones. It will damage the eyes (even loss of vision) upon contact. Deaths have been reported from concentrated acid burns involving as little as 2.5% Body Surface Area (BSA). We have experienced two types of HF Sampling: 1. Pure HF or Hydrofluoric Acid, Aqueous (70%) – see the material Safety Data Sheet (MSDS) at https://www.honeywell‐hfacid.com/document/msds‐hf‐70/?download=1 2. Hydrofluoric acid alkylation ‐ mostly used in refining Capabilities Applied/Processes To sample HF, one has to deal with the following challenges:  This is a deadly chemical and absolutely no exposure is allowed.  For some alkylation application, we have seen Stainless Steel (316L) as acceptable, but for most application specialty alloy such as Monel 400, Alloy20 or Hastelloy ® are required. The material of construction (MOC) is specified by the customer. Recommended Sampling System  Multi‐function metallic valve o With bellows type seal, stuffing box and leak detection port o With spring‐to‐close hand wheel (Magic Hand Wheel)  Bayonet adapter o Option: with rinsing connection  Container o With bellows type seal, stuffing box and leak detection port o Option: with neutralizing chamber  Safety plug Explanation  Both the valve and container are 100% dead‐space free and in theory, this eliminates all exposure. (see page 2 No Dead space sampling) In practice, a very small amount of product can be trapped between the outlet of the valve and container. To dispose safely of the trapped amount, the bayonet adapter can be fitted with a rinsing connection (see page 3 Sampling into container and bayonet with rinsing connection)  Transporting HF from the sample point to the lab in its pure state is dangerous. The container can be manufactured with a neutralizing chamber where HF and neutralizing agent can be mixed together to create a safe sample.  The bellows type seal in both the valve and container reduces stem leakage chances and improves maintenance  The stuffing box (packing) is secondary containment in case of bellows problem  The leak detection port can be used to detect bellows problems before the valve leaks  The integrated vent connection fitted on all our valves allows the trapped product between the valve outlet and the container to be vented securely using the bayonet adapter with rinsing connection  The safety plu

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