FMC Technologies Smith Meter AccuLoad, Руководство по испытанию танка

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Section V – Factor Optimizing
MN06146 Issue/Rev. 0.1 (7/10) 10
Example:
Maximum Delivery rate 700 gpm – Q
1
Second High Flow Rate 400 gpm – Q
2
Low Flow Start Rate 250 gpm – Q
3
Minimum Flow rate 140 gpm – Q
4
Program Values:
Minimum Flow Rate 140 gpm
Low Flow Start 1 (Low Flow Start – yes)
Low Flow Start Volume 100 gallons (whatever is standard)
Low Flow Start Rate
250 gpm, Q
3
First High Flow Rate
700 gpm, Q
1
Second High Flow Rate
Could be Q
2
if Second High Q is
used. If not, leave zeros.
First Trip Volume
Could range from 8-20% of Q
1
,
depending on system response.
Final Trip Volume Depends on system response.
Flow Rate #1
700 gpm, Q
1
Factor #1
Factor for Q
1
Flow Rate #2
400 gpm, Q
2
Factor #2
Factor for Q
2
Flow Rate #3
250 gpm, Q
3
Factor #3
Factor for Q
3
Flow rate #4
140 gpm, Q
4
Factor #4
Factor for Q
4
Proving Mode Leave at W&M Proving
Step 24
Repeat Step 4, except for normal loading conditions.
Step 25
Record tank prover volume and the AccuLoad vo-
lume. Compare the deviation to the agreed upon
standards.
Step 26
Make from one to four additional runs to check the
repeatability.
Step 27
If there is a significant deviation between the average
values of the AccuLoad volumes and the tank prover
volumes recorded in Steps 25 and 26,
1. Verify that the factors that have been entered are
correct.
2. Verify the proving procedures.
3. Adjust the factor for Q
1
the amount needed to ob-
tain perfect agreement.
The factor for Q
1
obtained in Steps 1-7 is subject to a
slight error due to the significant start-up and shut-
down transients used therein; whereas, the factor
values for Q
2
, Q
3
, and Q
4
should be very precise since
the start-up and shutdown transients encountered
there are negligible. Also, the volume delivered at
flow Rates Q
2
, Q
3
, and Q
4
are relatively small com-
pared to the volume delivered at the Q
1
Flow Rate.
The volume V
1
, delivered at Q
1
, equals the total vo-
lume delivered, V
t
, minus the Low Flow Start Volume,
V
3
, minus the First Trip Volume, V
1t
.
V
1
= V
t
– V
3
– V
1t
For example, if: V
1
= 1,000
V
3
= 150
V
1t
= 50
Then, V
1
equals
1,000 – 150 – 50 = 800
and V
1
/V
t
= 800/1,000 = 0.80
AccuLoad I
The amount to increase the factor for Q
1
to obtain
perfect agreement between the AccuLoad I volume
and the prover volume, equals the percent total over
registration divided by the proportion of the total vo-
lume delivered at Q
1
.
Example 1
Over Registration = 4%
Total Volume Delivered at Q
1
= 80%
Old Factor = 1.0153
New Factor = ???
% 05 . 0
80 . 0
04 . 0
Decrease Factor
 