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Sectional boilers can be almost any size to as much as, 5 or 6 tons in
weight. They are usually delivered in separate parts requiring assembly. Heat-
ing by hot water is traditionally plumbers work, but in later years specialist
heating engineers have evolved and it is true to say that larger, heating jobs
have become mainly their concern. However, a great deal of domestic heating
and other smaller systems are carried out by the plumber; some of this work
involves the use of sectional boilers.
It is advisable to assemble the sections on the floor rather than on the
stand so that it will not get pulled about and maybe damaged. If, however,
the boiler is a heavy one, it can be assembled on the stand if care is taken.
The front of the stand can be removed for assembly of the front section.
Most radiator are sectional they can be extended and damaged sections
can be replaced. A trade catalogue will readily indicate the many different
patterns of radiator which can be had.
The majority of radiators have left- and right-hand malleable nipples
connecting the sections together. This is a very useful arrangement, but it
calls for some tare on the part of the dissembler. To remove a section of a ra-
diator, the plugs must first be removed from the ends. Now a special tool de-
signed to grip the fibs formed on opposite sides of the inside of the nipple, is
inserted from the end, the depth, to which it must go having already been
chalk on it by trial against the outside of the radiator. The air-cock tapping is
made on the return end of a radiator, which is left-hand threaded inside. A
moment's, thought will show that an anti clockwise turn will screw the nipple
out of the left-hand threaded end section and also out of the right-hand second
section. Working from the other hand, the reverse will be the case; that is, a
clockwise turn should be used.
Circulating head
In any gravity system of heating (i.e. no pump), circulating head is ex-
tremely important. Briefly it is due to the difference in weight of a given vol-
ume of water in the flow and return circulators. This factor governs the speed of
the circulation, and it should be borne in mind that the rapidity of the circulation
would determine the amount of heat, which will reach a given radiator.
It will readily be seen that if a pipe were taken from a boiler and carried
around a room horizontally and back to the boiler, no circulation would take
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