©Novinium, Inc. 2016, all rights reserved.
NRI 603 – Small Diameter Cables – SPR
Revised: February 19, 2016
Page
7
of
11
o
A gradual decline in flow rate
means a clean cable.
o
A sharp drop off in flow rate means
a restriction or blockage.
o
A sharp drop near the start of
injection is a restriction/blockage
near the feed end of the cable.
o
If the restriction/blockage is
farther along the cable, it will take
longer to reach a sharp flow rate
drop.
Figure 11:
Depiction of flow rates.
Estimating Fluids
1.
Estimate the current supplied fluid.
Note the current fluid level in
millimeters (mm).
Subtract the current level
from the starting level.
Figure 12:
Find the starting and current fluid levels.
To find the total fluid volume
in cubic centimeters (cc),
multiply the difference by the
tank factor for the feed tank
being used. Tank Factors can
also be found on a sticker on
the tank or in
NRI 412
.
2 or 3 Liter Tank Factor:
8.33 cc/mm.
9 Liter Tank Factor: 33.3
cc/mm.
Figure 13:
Tank factor sticker.
0
10
20
30
40
50
60
70
80
90
100
0
10
20
30
40
50
60
70
80
90
100
Time
Feed Flow
(% of scale)
unhindered flow
mid-span restriction
mid-span blockage
blocked near feed
