Repairs Effected to Boiler Gave Way During Sailing

Steam leaking on boiler tubes while sailing. Two boiler tubes were already plugged, and it was not replaced in the drydock. While sailing during UMS, steam low pressure alarm came & suddenly fire alarm also came. Changed over from UMS to completely manned and noticed that the boiler tubes were leaking from the sides. Leaking tubes were plugged & inside steam drum welding was done.