nema23_关于NEMA SM 23的说明

大家好，又见面了，我是你们的朋友全栈君。

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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