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2.3.3 Determining and Marking the Second Nozzle Location - MR1 Mid-Radius (cont.)
2. Due to the possible variation in OD of the pipe, measure the outside diameter of the pipe at four locations
between the nozzle centers (see Figure 33 below). Then, calculate the average OD from these measurements.
3. Using a roll of polyester film (or equivalent), cut a strip of film with dimensions as follows:
IMPORTANT: Ensure that the sides of the film are cut parallel to each other.
D 2W
–
------------------ -
Y
=
0
2
Width
Length
•
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: Width (S) = 2 x SQRT ((48/2)
d. From the 3rd equation: Length (L) = 3.5 x 48.000 = 168.000 in.
e. Thus, one would cut a piece of film 41.783 in. Wide x 168.000 in. Long.
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 above would be used instead.
Model T17 Installation Guide
D1
Figure 33: Multiple OD Measurements
×
(
Chord Location
2
D
×
--- -
(
S
2
Y
=
=
–
2
×
L
3.5
D
=
=
= (48.000 - (2 x 0.375))/2) x 0.5 = 11.813 in.
0
D2 D3
D4
Side View
)
where, W = 0.375 inches and Chord Location = 0.5
2
)
where, D
Average pipe OD (see step 2)
=
0
where, D
Average pipe OD (see step 2 above)
=
MR1
installation for a STD Schedule, 48" pipe.
2
- (11.81)
Chapter 2. Installing the Pipe Nozzles
2
) = 41.783 in.
25
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