10.2.1 At the surveys described in 10.1, the boilers, superheaters, economisers
and air heaters are to be examined internally on the water-steam side and the fire
side. Where considered necessary, the pressure parts are to be tested by hydraulic
pressure and the thicknesses of plates and tubes and sizes of stays are to be
ascertained to determine a safe working pressure. The safety valves and principal
mountings on boilers, superheaters and economisers are to be examined and opened up
as necessary by the Surveyor. The adjustment of safety valves is to be verified
during each boiler internal survey. Boiler safety valves and their relieving gear
are to be examined and tested to verify their satisfactory operation. Safety valves
are to be set under steam to a pressure not greater than the approved design
pressures of the respective parts. As a working tolerance, the setting is
acceptable, provided that the valves lift at not more than 103 per cent of the
approved design pressure. However, for exhaust gas heated economisers, if steam
cannot be raised in port, the safety valves may be set by the Chief Engineer at sea,
and the results recorded in the Log Book and reviewed by the attending Surveyor. The
following records since the previous Boiler Survey are to be reviewed as part of the
survey:
- Operation.
- Maintenance.
- Repair history.
- Feedwater chemistry.
The remaining mountings are to be examined externally and, if considered
necessary by the Surveyor, are to be opened up for internal examination. Collision
chocks, rolling stays and boiler stools are to be examined and maintained in an
efficient condition.
10.2.2 In addition to the requirements of 10.2.1, in exhaust gas heated
economisers of the shell type, all accessible welded joints are to be subjected to a
visual examination in order to identify any evidence of cracking. Non-destructive
testing may be required for this purpose and may be requested by the Surveyor.
10.2.3 In fired boilers employing forced circulation, the pumps used for this
service are to be opened and examined at each Boiler Survey.
10.2.4 The fuel oil burning system is to be examined under working conditions
and a general examination made of fuel tank valves, pipes, deck control gear and oil
discharge pipes between pumps and burners.
10.2.5 At each survey of a cylindrical boiler which is fitted with smoke tube
superheaters, the saturated steam pipes are to be examined as detailed in Section
11.
10.2.7 For gas and crude oil burning systems, remote and/or automatic controls
are to be examined and tested. Ventilating systems for ducts and machinery spaces
are to be examined, tested and proven satisfactory.