Table of Contents
Advertisement
Chapter 2. Installing the Pipe Nozzles
2.4.3 Determining and Marking the Second Nozzle Location - MR2 Mid-Radius (cont.)
4. Mark a line on the piece of film at a distance AS from the left edge, as shown in Figure 55 below.
D 2W
–
------------------ -
Y
=
0
2
X
•
Example: To demonstrate the calculations, consider an
a. From standard pipe tables: pipe OD = 48.000 in. and pipe wall thickness (W) = 0.375 in.
b. From the 1st equation: Y
c. From the 2nd equation: X
d. From the 3rd equation: β = ATAN (20.90/11.81) = 1.056 radian
e. Thus, AS = 48.000 x 1.056 = 50.697 in. (Note that this is the same value listed in Table 8 on page 45.)
Note: In the above example, the tabulated pipe OD of 48.000 in. was used in the calculations for clarity. Ideally, the
measured average pipe OD from step 2 on the previous page would be used instead.
44
AS
S
Figure 55: Film Cut to Size and Marked
×
(
)
Chord Location
2
D
2
--- -
(
)
Y
=
–
0
0
2
β (radian)
D β
×
AS
where, D
=
= (48.000 - (2 x 0.375))/2) x 0.5 = 11.813 in.
0
= SQRT ((48/2)
0
Mark Line
L
where, W = 0.375 inches and Chord Location = 0.5
where, D
Average pipe OD (see step 2)
=
X
0
------ -
atan
=
Y
0
Average pipe OD (see step 2)
=
installation for a STD Schedule, 48" pipe.
MR2
2
2
) = 20.892 in.
- (11.81)
Model T17 Installation Guide
Advertisement
Table of Contents
