High pressure boilers using demineralized water are most vulnerable to caustic corrosion.

To inject chemicals into the boiler drums of small, stationary, low pressure boilers.

Corrosion in low pressure boilers can be caused by dissolved oxygen, acidity and excessive alkalinity.

The almost ten-year difference between the installation of the first high pressure boilers and this final one results in differences between them.

However, it continued to produce power, although operating only one turbo set and two high pressure boilers.

Some of the G2As subsequently received lower pressure boilers on overhaul, taking them back into Class G1.

Steam was provided in the first three ships by twelve ultra-high pressure boilers.

The prototype for the B1 was a B17/1 modified with a higher pressure boiler and with its centre cylinder removed.

These were popular with some operators, and increasingly so for high pressure boilers.

Seven turbines, with two very high pressure boilers, were linked by gears to twin propellers.