KARACHI -  All the CNG stations in Sindh including Karachi will remain closed for 24 hours from 9am on April 7 till 9am on April 8 under gas load management strategy. According to an announcement of Sui Southern Gas Company (SSGC) here Friday, this step is being taken by the gas utility to improve the line pack position all over its franchise area, which has been badly disturbed due to inceased domestic gas load. during the current season, SSGC said.