tipp79
Civil/Environmental
- Nov 3, 2006
- 38
Hello all,
As part of a WTW upgrade, we're changing from chlorine gas to sodium hypochlorite. The sodium hypochlorite dosing requires carrier water to maintain velocity in the dosing lines. This carrier water is final water from the WTW and as such has been dosed with sodium hydroxide. At a recent HAZOP, the water authority informed us that there had been several projects where the presence of caustic in carrier water for sodium hypo resulted in deposits of calcium in the dosing line and hence blockages.
My question is how would the having carrier water dosed with caustic for hypo dosing result in calcium deposits? The water is not hard.
Cheers,
James
As part of a WTW upgrade, we're changing from chlorine gas to sodium hypochlorite. The sodium hypochlorite dosing requires carrier water to maintain velocity in the dosing lines. This carrier water is final water from the WTW and as such has been dosed with sodium hydroxide. At a recent HAZOP, the water authority informed us that there had been several projects where the presence of caustic in carrier water for sodium hypo resulted in deposits of calcium in the dosing line and hence blockages.
My question is how would the having carrier water dosed with caustic for hypo dosing result in calcium deposits? The water is not hard.
Cheers,
James