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Unfortunately,
NEMA SM 23
is ambiguous about the point of resolution of
the combined forces and moments. The resolution points have been
interpreted to be the following two points:
NEMA SM 23
没有给出设备整体校核时所有作用力和作用弯矩应分解到的分解点
的规定。于是产生了下列两种不同看法：
1. The face of the flange at the exhaust nozzle connection.
2. The intersection point of the exhaust nozzle centerline and the
equipment shaft centerline.
1.
出口管中心线与法兰面的交点
2.
出口管中心线与设备轴线的交点
In
order
to
resolve
the
forces
and
moments
at
the
exhaust
nozzle
connection,
enter the X distance from the exhaust nozzle to each connection.
对于第一种情况，应计算出出口管点到各管口的位移
In order to resolve the forces and moments at the intersection point of
the exhaust nozzle and the shaft centerlines, enter the X distance from
the intersection point to each connection.
对于第二种情况，应计算出交点到个管口的位移
I
really
can’t
advise
you
on
which
resolution
point
you
should
use,
since
this would be offering
engineering advice
on an ambiguity in the NEMA
standard.
However,
I
do
have
a
written
(fax)
statement
from
the
NEMA
board
sent to one of our customers (in 1997) that states:
由于规范没有对此做出规定，
所以我无法建议你们使用哪种方法更好，
这应根据
工程实际情况而定。尽管我确实曾经在
1997
年做出过建议：
Quote:
The
forces
and
moments
on
the
steam
turbine
connections
are
to
be
resolved
about the intersection of the centerline of the turbine exhaust and the
centerline of the turbine shaft.
(应考虑“交点”方法)
We
have
been
unable
since
this
time
to
obtain
any
additional
information
on this particular topic from NEMA.
Whatever you decide to do, make sure the owner/operator/inspector all
agree.
无论使用哪种方法，业主、操作者、检查者之间都应达成共识。
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