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aifeiya锅炉换管工艺
PROCEDURE OF BOILER TUBE REWELDING
１．BRIEF:
1.1 The boiler is fuel oil boiler, some welding seam between boil tubes and tube plate found cracks and leakage. as owner’s requirement, all the welding seam between tubes boil tubes and tube plate to be rewelded. This repair is only a temporary repair because this tube plate has been badly deformed and need renewal. Shipyard will take no responsibility if any accident happened after this repair. We suggest that the ship owner should renewal the tube plate and boil tubes as soon as possible.
1.2 Tubes and tube plate to be fitted with the way of welding.
２．BOILER DATA:
2.1 Working pressure: to be supplied by owner.
3．REWELDING PROCEDURE：
3.1 Preparation on spot：
3.1.1 Manhole covers of boiler water and gas side to be opened.
4.1.2 Staging to be erected, safety precaution should be ensured, and the spot should be clean.
3.2 Welding seam gouging：
4.2.1 Mark and record all the stay tube position.
4.2.2 Cut the welding seam between tube and tube plate by gouging. Be careful no to damage the tube and tube plate. The cutting area to be ground smoothly.
3.3 Inspection tube plates：
3.3.1 After grinding and cleaning, the surface of tube plate to be dye penetrate tested and approved by superintendent.
Rewelding：
Around the tube holes should be cleaned and smooth and to be approved. Stay tubes to be welded first, then the other tubes.
3.5 Welding：
3.5.1 The J507（E5015）low hydrogen alkaline welding rod to be used, DIA.2.5-3.2mm, AC reverse welding. Rods to be baked and kept warm for 1.5 hours before welding. Rods’ quality certificate approved by classification to be supplied. .
3.5.2 Weld the tubes according to the attached drawing, then clean the welding area.
3.5.3 Welding quality request：welding seam surface should be full and in good shape, and have no disfigurement.
3.5.4 The welders should have welding certificate approved by classification.
3.6 Welding seam inspection:
All the welding seam to be 25% MPI tested, an
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