Is it permissible to interrupt congregational prayer to extinguish a fire in a water pump machine if there is fear of significant damage?

Yes, if a fire breaks out or smoke appears during prayer, it is permissible to interrupt the prayer to remove the danger, and then return to complete it. This is because interrupting prayer for an important interest, such as extinguishing a fire or repelling a great danger, is permissible. If one person is not enough to remove the danger, and there is a need for the congregation to interrupt their prayer collectively, there is no harm in that. They should then return to complete their prayer.