TAMIL NADU

Guidelines laid out for M-sand producers

M-sand should comply with the BIS code, says the government .file photo

M-sand should comply with the BIS code, says the government .file photo  

The State government has come up with a set of guidelines on distance criteria, type of crushing machinery and air pollution control measures for M-sand manufacturing units.

The Tamil Nadu Pollution Control Board (TNPCB) chairman had constituted a committee to study M-sand manufacturing units. The committee submitted a report with certain recommendations. It was placed before the Board, which approved it in its meeting on July 25.

As per the recommendations, the Board has categorised M-sand units with or without stone crushers, based on the pollution index, as ‘Orange’ category (same as crusher units). The existing stone crushers manufacturing M-sand within the consented quantity would not be treated as expansion activity.

Due to process modification, the units should apply and obtain fresh consent of the board under Water and Air Acts to include M-sand as one of the products.

All consented standalone M-sand units would be verified and are required to carry out activities only with vertical shaft impactor (VSI) crusher. No primary crusher like jaw crusher, secondary crusher and cone crusher should exist on the consented premises. As mentioned in Public Works Department circulars, the TNPCB categorically states that the VSI crusher was the best machine for making M-sand and it alone would be permitted. All existing consented M-sand units operating with horizontal shaft impactor crushers should change to vertical crushers by December.

Quality test report

Crushed stone (M-sand) should comply with all provisions in the BIS codes. The units should obtain product approval certificate from the PWD assessment committee.

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