Scope of Inspection:
The scope of inspection is to clean the boiler's internal surfaces and to check for corrosion and scale formation in the boiler. As the boiler normally runs continuously, there are few chances to open the boiler. Thus, during the inspection all the important checks will be carried out and it will be made sure that the boiler will safely work without any problems until the next inspection. Routine inspection is important because salt formation and scaling inside the boiler tubes will reduce the heat transfer rate and ultimately damage the tubes due to overheating.
- The inspection should include finding reasons for any abnormality found and should also ensure that any repair carried out does not affect that safe working order of the boiler.
- A complete inspection means full internal and external examination of all parts of the boiler and accessories such as super-heaters, air heaters, and all mountings.
- The examination may lead the inspector to require hydraulic testing of pressure parts or thickness gauging of plate or tubs that appear to be checked for good working condition.
The Inspection is not completed until the boiler has been examined under steam and the following items dealt with:
a) Pressure gauge checking against a test gauge.
b) Testing of water level indicators and protective devices.
c) Safety valves adjusted under steam to blow off at the required pressures.
d) The oil fuel burning system examined.
e) Testing of remote control gear for fuel shut off valves.
For a gas fired boiler, the chief engineer floats the safety valve at sea at the first opportunity. Survey record is not assigned until a statement is received from chief engineer about the pressure at which the safety valves were set.