Grounds for granting permanent alimony under special marriage act

The Special Marriage Act, 1954 is enacted to provide a special form of marriage for the people of India and all Indian nationals in foreign countries, irrespective of the religion or faith followed by either party. 

Section 37 of the Special Marriage Act, 1954 talks about permanent alimony and maintenance.

(1) A court may, at the time of passing any decree or at any time after the decree, on application made to it, order that the husband shall provide such gross sum or monthly or periodical payment of money to the wife for her maintenance and support for a term not exceeding her life, as it may seem just to the court, after considering her own property (if any), her husband’s property and ability.
 
(2) If the district court is satisfied that there in a change in the circumstances of either party at any time after it has made an order to grant alimony, it may, at the instance of either party, vary, modify or rescind any such order in such manner as it may seem to the just court.
 
(3) If the district court is satisfied that the wife has remarried, it may, at the instance of the husband vary, modify or rescind any such order and in such manner as the court may deem just.

You may need to consult a competent divorce lawyer for detailed advice on this matter.