A hand-held blasting gun for use in dry ice blasting for cleaning purposes. A handle and a nozzle mount are pivotally joined so a nozzle on the nozzle mount can be adjustably directed relative to the handle. A flexible hose is fitted in the gun, extending from the end of the handle to the nozzle so as to send without kinking.

Gunning apparatus adapted to be carried by a mobile device such as a fork lift truck and inserted in a side door of a furnace such as an electric furnace and used to gun refractory material onto the inside surface of the furnace lining comprises a boom with one end adapted to be attached to the mobile device and the other end carrying a spray nozzle which can be rotated about a vertical axis, the boom also carrying channels to convey, separately, refractory and water to a mixer where the refractory and water are admixed, a channel to carry the admixture to the spray nozzle, and a motor to rotate the spray nozzle.

The disclosed methods and systems for inspecting and repairing vessels include a laser used to project a laser beam into a hot furnace or vessel, a laser reader to measure a point cloud formed when the laser light reflects from the wall of the furnace, means for selecting those points in the cloud that are more relevant, and using the points to produce a 3D image that corresponds to the geometry of the interior of the furnace or vessel. The disclosed systems and methods further include means for comparing the 3D geometric data corresponding to the interior of the vessel with 3D geometric data provided as a reference, generating a 3D repair trace based on the comparison, and controlling a spray gun for applying refractory material according to the trace by taking into account a set of physical variables related to the vessel and the refractory material.