18. (1) When any property is required temporarily for a public purpose or in the public interest, the Deputy Commissioner may, with the prior approval of the Government, by order in writing, requisition it: Provided that no such approval shall be necessary in the case of emergency requirement of any property: Provided further that, save in the case of emergency requirement for the purpose of maintenance of transport or communication system, no property which is bona fide used by the owner thereof as the residence of himself or his family or which is used either for religious worship by the public or as an educational institution or orphanage or as a hospital, public library, graveyard or cremation ground shall be requisitioned. (2) Where an order made under sub-section (1) has been served, the Deputy Commissioner may take possession of the requisitioned property-(a) in the case of emergency requirement for the purpose of maintenance of transport or communication system, at any time after the date of service of the order;(b) in any other case, after the expiry of thirty days from the date of service of the order,and may use the property for the purpose for which it has been requisitioned. (3) Except with the prior approval of the Government, no property shall be kept under requisition for a period exceeding two years from the date of taking over possession of such property.