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Methods to remove gypsum scale

I'm looking the kind to remove scale formed of calcium sulphate ( gypsum )in to the heat exchanger tubes. the film has 1-5 millimeters .The internal diameter tube is 2 inch, 26 ft longitude; 1250 tubes. The appearance and hardness of the material is like ceramic. Actually we use to remove this scale water at high pressure, but has low efficiency.We have intended with some light acids but hadn't been possible.

Marco Antonio Acuña Medellin
- Monterrey, NL Mexico
2002

I would try a strong chelating material like tetra sodium salt of EDTA.

Geoffrey Whitelaw
- Port Melbourne, Australia
2002

Dear Marco,

I need a bit more information. I think I have a solution.

Tim Hix
- Moseley, Virginia
2003

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