law: The Arbitration and Conciliation Act, 1996
  15. Termination of
  
  mandate and substitution of arbitrator.
  1.  
  
    In
  
  addition to the circumstances referred to in section 13 or section 14, the
  
  mandate of an arbitrator shall terminate-
  a.   where he withdraws
  
  from office for any reason; or
  b.   by or pursuant to
  
  agreement of the parties.
  1.  
  
  
  2.  
  
    Where
  
  the mandate of an arbitrator terminates, a substitute arbitrator shall be
  
  appointed according to the rules that were applicable to the appointment of the
  
  arbitrator being replaced.
  3.  
  
    Unless
  
  otherwise agreed by the parties, where an arbitrator is replaced under
  
  subsection (2), any hearings previously held may be repeated at the discretion
  
  of the arbitral tribunal.
  4.  
  
    Unless
  
  otherwise agreed by the parties, an order or ruling of the arbitral tribunal
  
  made prior to the replacement of an arbitrator under this section shall not be
  
  invalid solely because there has been a change in the composition of the
  
  arbitral tribunal.