The closure of a section of Orchard Rd included an entrance to the hospital, regarded mainly as the back entrance.
Hawke's Bay District Health Board communications manager Anna Kirk said there had been no indication of a need to evacuate areas of the hospital. Canning Rd, which includes the Emergency Department and Ata Rangi delivery suite, was closed to all but emergencies and hospital appointments, and Orchard Rd traffic headed for the hospital was being directed to other entrances.
The Fire Service reported eight crews were in the area, with 30 people evacuated initially, including pensioner flat residents.
There had been a "large gas cloud" in the area, a Fire Service shift manager said, and firefighters used a post-emission curtain of water to mitigate the spread of the gas.
Powerco operations manager (gas) Don Elers said the leak was near Hawke's Bay Hospital so all relevant emergency services such as ambulance and the rescue helicopter base had been alerted.
He said the gas main supplied a significant number of industrial customers who were affected while repairs were made.
By 1pm only about 50 metres of Orchard Rd remained closed as repairs continued.