GE T17, Руководство по установке

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Chapter 2. Installing the Pipe Nozzles
22 Model T17 Installation Guide
2.3.2 Selecting and Marking the First Nozzle Location - MR1 Mid-Radius (cont.)
3. Refer to Figure 29 below, and calculate the location for the center of the first nozzle as follows:
Note:
See Table 3 on page 23 for tabulated AS/2 values calculated from the above equation for common pipe sizes.
Note:
To clarify the use of the above equations, see the bottom of page 26 for a typical example calculation.
Figure 29: Locating the MR1 Nozzles on the Pipe
Y
0
D 2W
–
2
------------------- (Chord Location)
×
=
where, Chord Location
1
2
--- (for mid-radius installations)
=
X
0
D
2
----
 
 
2
Y
0
( )
2
– =
AS
2
--------
D
2
----
β ×
=
where, β (radian)
X
0
Y
0
------- atan
=
S
2
---- X
o
=
AS
2
--------
D
2
---- B ×
=
D 2W
–
2
-------------------
D
2
----
D 2W
–
2
-------------------
 
 
CHORD
LOC
 
 
×
W
B
X
o
,Y
o
( )
2nd Nozzle
1st
Nozzle
Downstream
End View