A tank including an enclosure including a tubular body and first and second end walls at the ends of the tubular body, a plurality of equipment units positioned in the enclosure, at least one equipment support to which the equipment units are connected positioned in the enclosure and connected to the enclosure and a method of manufacturing this tank. The equipment units are fixed to the equipment support outside the enclosure, which simplifies putting them into place and limits the risks of damage. Moreover, they are all introduced into the enclosure at the same time, which makes it possible to reduce the time to manufacture the tank.