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Issue Date: November 22, 1995
Revision Date: April 14, 2015
AMETEK Automation & Process Technologies
(originally listed as MagneTek, then Patriot Sensors and Controls Corp.)
7021 Digital
Tank Gauge
(7030 Series Magnetostrictive Probe)
AUTOMATIC TANK GAUGING METHOD
As of 2005, the 7021 product line became obsolete.
| Certification |
Leak rate of 0.2
gph with PD = 99.96% and PFA = 0.044%.
Leak rate of 0.1 gph with PD = 95.34% and PFA = 4.66%. |
| Leak
Threshold |
0.1 gph for leak
rate of 0.2 gph.
0.05 gph for leak rate of 0.1 gph.
A tank system should not be declared tight if the test result indicates a
loss or gain that equals or exceeds this threshold. |
| Applicability |
Gasoline, diesel,
aviation fuel, fuel oil #4. |
| Tank
Capacity |
Maximum of 15,000
gallons.
Tank must be between 50 and 95% full for leak rate of 0.2 gph.
Tank must have minimum product height of 18 inches, or be 14% full,
whichever is higher, for leak rate of 0.1 gph. |
| Waiting
Time |
Minimum of 2
hours between delivery and testing for leak rate of 0.2 gph.
Minimum of 8 hours between delivery and testing for leak rate of 0.1
gph.
There must be no dispensing or delivery during waiting time. |
| Test
Period |
Minimum of 4
hours.
Test data are acquired and recorded by a 7021 controller (computer).
Leak rate is calculated from data determined to be statistically
valid.
There must be no dispensing or delivery during test. |
| Temperature |
Average for
product is determined by a minimum of 1 resistance temperature detector (RTD). |
| Water
Sensor |
Must be used to
detect water ingress.
Minimum detectable water level in the tank is 0.947 inch.
Minimum detectable water level change is 0.0254 inch. |
| Calibration |
RTD and probe
must be checked and, if necessary, calibrated in accordance with
manufacturer's instructions. |
| Comments |
Not evaluated
using manifolded tank systems. Therefore, this certification is only
applicable when there is a probe used in each tank and the siphon is broken
during testing.
Tests only portion of tank containing product. As product level is
lowered, leak rate in a leaking tank decreases (due to lower head
pressure).
Consistent testing at low levels could allow a leak to remain
undetected.
EPA leak detection regulations require testing of the portion of the tank
system which routinely contains product. |
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AMETEK Automation & Process Technologies
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Evaluator:
Ken Wilcox Associates
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1080 N.
Crooks Rd.
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Tel:
(816) 443-2494
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Clawson,
MI 48017-1097
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Date of
Evaluation: 02/07/91, 4/25/1995
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Tel: (800) 635-0289 |
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| URL: www.ametekapt.com |
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