It is an epoxy mortar that offers significant advantages in the permanent repair of pipelines in operation by the resin injection system inside pressure vessels. The epoxy mortar works as a stress transmitter to the vessel wall, as well as an immobilizer of pipe fittings if applicable. As a whole it is a special epoxy compound of very low viscosity 100% solid, so it can be injected by means of special pumps or emptied by gravity on the annular spaces of pressure vessels or on containers that encapsulate valves, flanges, straps, clamps, etc., which once encapsulated can never present a leak due to their design characteristics.