Scotch Marine Boiler
Scotch Marine Boiler
The Scotch marine tire-tube boiler is especially suited to Seabee needs. Figure
shows a portable Scotch marine tire-tube boiler. The portable unit can be moved easily
and requires only a minimal amount of foundation work. A completely self-contained
unit, its design includes automatic controls, a steel boiler, and burner equipment. These
features are a big advantage because no disassembly is required when you must move
the boiler into the field for an emergency.
The Scotch marine boiler has a two-pass (or more) arrangement of tubes that run
horizontally to allow the heat inside the tubes to travel back and forth. It also has an
internally fired furnace with a cylindrical combustion chamber. Oil is the primary fuelused to fire the boiler; however, it can also be fired with wood, coal, or gas. A major
advantage of the Scotch marine boiler is that it requires less space than a water-tube
boiler and can be placed in a room that has a low ceiling.
The Scotch marine boiler also has disadvantages. The shell of the boiler runs from 6 to
8 feet in diameter, a detail of construction that makes a large amount of reinforcing
necessary. The fixed dimensions of the internal surface cause some difficulty in
cleaning the sections below the combustion chamber. Another drawback is the limited
capacity and pressure of the Scotch marine boiler.
An important safety device sometimes used is the fusible plug that provides added
protection against low-water conditions. In case of a low-water condition, the fusible
plug core melts, allowing steam to escape, and a loud noise is emitted which provides a
warning to the operator. On the Scotch boiler the plug is located in the crown sheet, but
sometimes it is placed in the upper back of the combustion chamber. Fusible plugs are
discussed in more detail later in this chapter.
Access for cleaning, inspection, and repair of the boiler watersides is provided through a
manhole in the top of the boiler shell and a handhole in the water leg. The manhole
opening is large enough for a person to enter the boiler shell for inspection, cleaning,
and repairs. On such occasions, always ensure that all valves are secured, locked, and
tagged, and that the person in charge knows you are going to enter the boiler.
Additionally, always have a person located outside of the boiler standing by to aid you in
case of an incident that would require assistance. The handholes are openings large
enough to permit hand entry for cleaning, inspection, and repairs to tubes and headers.
Figure 9-14 shows a horizontal fire-tube boiler used in low-pressure applications.
Personnel in the UT rating are assigned to operate and maintain this type of boiler more
often than any other type of boiler.
The Scotch marine tire-tube boiler is especially suited to Seabee needs. Figure
shows a portable Scotch marine tire-tube boiler. The portable unit can be moved easily
and requires only a minimal amount of foundation work. A completely self-contained
unit, its design includes automatic controls, a steel boiler, and burner equipment. These
features are a big advantage because no disassembly is required when you must move
the boiler into the field for an emergency.
The Scotch marine boiler has a two-pass (or more) arrangement of tubes that run
horizontally to allow the heat inside the tubes to travel back and forth. It also has an
internally fired furnace with a cylindrical combustion chamber. Oil is the primary fuelused to fire the boiler; however, it can also be fired with wood, coal, or gas. A major
advantage of the Scotch marine boiler is that it requires less space than a water-tube
boiler and can be placed in a room that has a low ceiling.
The Scotch marine boiler also has disadvantages. The shell of the boiler runs from 6 to
8 feet in diameter, a detail of construction that makes a large amount of reinforcing
necessary. The fixed dimensions of the internal surface cause some difficulty in
cleaning the sections below the combustion chamber. Another drawback is the limited
capacity and pressure of the Scotch marine boiler.
An important safety device sometimes used is the fusible plug that provides added
protection against low-water conditions. In case of a low-water condition, the fusible
plug core melts, allowing steam to escape, and a loud noise is emitted which provides a
warning to the operator. On the Scotch boiler the plug is located in the crown sheet, but
sometimes it is placed in the upper back of the combustion chamber. Fusible plugs are
discussed in more detail later in this chapter.
Access for cleaning, inspection, and repair of the boiler watersides is provided through a
manhole in the top of the boiler shell and a handhole in the water leg. The manhole
opening is large enough for a person to enter the boiler shell for inspection, cleaning,
and repairs. On such occasions, always ensure that all valves are secured, locked, and
tagged, and that the person in charge knows you are going to enter the boiler.
Additionally, always have a person located outside of the boiler standing by to aid you in
case of an incident that would require assistance. The handholes are openings large
enough to permit hand entry for cleaning, inspection, and repairs to tubes and headers.
Figure 9-14 shows a horizontal fire-tube boiler used in low-pressure applications.
Personnel in the UT rating are assigned to operate and maintain this type of boiler more
often than any other type of boiler.
The steam produces in drum shell it taken out from the upper side where it flows through super heater if required.
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Not required heaters .
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