Precaution for Handling Sodium-Filled Valves
- Difficulty Level:
Read all of the instructions before disposing of sodium-filled valves.
- Sodium requires extreme caution in handling and disposal. Sodium is highly flammable and it reacts with water and oxygen available in the air. Especially, sodium reacts with water vigorously and may cause an explosion.
- Make sure to wear protective tools (such as goggles and gloves) when handling sodium. Keep sodium away from eyes and skin as it may cause caustic skin burns, and contact with eyes may cause blindness.
- When handling sodium, be sure to do so at the well-ventilated place as it reacts with water to form hydrogen gas.
- If you come in contact with sodium, flush thoroughly with a large amount of water and seek immediate medical attention.
A. Identification marks for sodium-filled valves are located inside of the valve head.
Waste Disposal of Sodium-Filled Valves
1. When the Sodium-Filled Valves are NOT damaged
WARNING :- Do not destroy the valves intentionally to expose sodium.
- You can dispose of the sodium-filled valves as the normal valves unless sodium in the valve stem is exposed.
- When disposing of non-damaged sodium-filled valves, be sure to melt them without pressing or cutting before disposal.
2. When the Sodium-Filled Valves are damaged
NOTE: Do the neutralization procedure before disposal.
- Make sure to wear the protective goggles and gloves, and do this procedure at the well-ventilated place.
- When you do this procedure, make sure to have a fire extinguisher (dry powder type) on hand.
- Handle the damaged valves with tweezers or tongs, not with bare hands.
1. Prepare a large container filled with 10 L (2.64 US gal, 2.2 Imp gal) of water.
2. Soak the damaged valves into the water.
－ Soak the damaged valves completely.
－ Keep all cigarettes, sparks, and flames away from the container. Chemical reaction of sodium and water generates hydrogen.
－ Keep a few meters away from the container as this procedure may cause severe reaction of chemicals.
－ This procedure can neutralise maximum of six damaged valves at the same time.
3. When the procedure is finished after 4-5 hours, pick up the damaged valves with tweezers or tongs, and dispose of them as normal valves.
The waste liquid after neutralisation procedure contains highly-concentrated sodium hydroxide. It is very harmful physically and environmentally. Be careful of disposal of waste