<s>
A	O
monotube	B-Algorithm
steam	I-Algorithm
generator	I-Algorithm
is	O
a	O
type	O
of	O
steam	O
generator	O
consisting	O
of	O
a	O
single	O
tube	O
,	O
usually	O
in	O
a	O
multi-layer	O
spiral	O
,	O
that	O
forms	O
a	O
once-through	O
steam	O
generator	O
(	O
OTSG	O
)	O
.	O
</s>
<s>
Monotube	B-Algorithm
steam	I-Algorithm
generators	I-Algorithm
may	O
either	O
boil	O
gradually	O
along	O
their	O
length	O
,	O
usually	O
pumped	O
circulation	O
systems	O
,	O
but	O
where	O
this	O
boiling	O
does	O
not	O
disrupt	O
the	O
circulation	O
.	O
</s>
<s>
Examples	O
of	O
Monotube	B-Algorithm
steam	I-Algorithm
generators	I-Algorithm
include	O
:	O
</s>
<s>
A	O
flash	O
boiler	O
is	O
a	O
particular	O
type	O
of	O
low-water-content	O
monotube	B-Algorithm
boiler	I-Algorithm
.	O
</s>
