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6.11. Acid Darts with Burst Discs
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Acid darts are made to withstand concentrated hydrochloric acid and mild
hydrofluoric acid, or mixtures of these acids used in well workover.
The foil used in the disc is Alloy C-276.
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Though this is exceptionally corrosion resistant, it should not be assumed
totally resistant, particularly if the acid mixture is say hydrofluoric
with a strong oxidising acid such as nitric acid. Please consult us if
you have any particularly powerful mixture.
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All Acid Darts are suitable for use as Cement darts. The reverse is not true.
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This is a new list and is expanding as demand occurs, but in principle
all the sizes of the cement dart ranges are possible as acid darts.
The pressure ratings are likely to differ. Please ask.
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However, the cement darts in the larger sizes (2 3/8", 2 5/8", 2 7/8"
and 3 1/2" of sections 6.4.7. and 6.4.8.) are designed for dual use
as acid or cement darts, and are not separately listed in this section.
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