Issue
Date: March 10, 2000
Revision Date: December 4, 2002
Linde Services, Inc.
(Formally Praxair Services, Inc., originally listed as Tracer Research Corp.)
Tracer
ALD 2000 Automated Line Tightness Test
LARGE
DIAMETER LINE LEAK DETECTION METHOD (6 inches diameter or
above)
Certification
|
Leak rate of 0.1 gph with
PD = 100% and PFA = 0%.
The USEPA has not set a minimum detectable leak rate
for large diameter pipeline systems (airport hydrant systems)
at the time of this evaluation. |
Leak
Threshold
|
A
pipeline system should not be declared tight when tracer
chemical or hydrocarbon greater than the background level
is detected outside of the pipeline system.
|
Applicability
|
Gasoline,
diesel, aviation fuel, fuel oil #4, waste oil.
Other fluids which are compatible and soluble with an
acceptable tracer chemical may be tested after consultation
with the manufacturer.
|
Pipeline
Capacity
|
Not
limited by capacity.
|
Waiting
Time
|
Ranges
from 1 week to 4 weeks (normally 2 weeks) after tracer
is added to tank.
For very large pipeline systems, several days or weeks
may be required to circulate tracer-labeled product through
all parts of the pipeline.
Waiting time begins after tracer has reached all portions
of the pipeline being tested.
|
Tracer
Dosage
|
Tracer
is added to tank manually or automatically using a metered
injection pump at tank fill or tank discharge pipeline.
Tracer-labeled product must be circulated through pipeline
before test period begins.
Pressurized pipeline must be brought up to operating pressure
or operated on a daily basis.
Manual dosage of tracer is based on tank size, product
volume in tank, and frequency and volume of tank refills
according to manufacturer's recommendations.
Automated pipeline injection uses metered injection pumps
to automatically inject tracer every time product flows
through pipeline.
Dosage is based on pipeline size and flow rate.
|
Permeability
|
Soil
permeability must readily allow tracer movement through
the tank excavation backfill (greater than 1 Darcy).
|
Probe
|
Radius
of influence of each tracer sampling probe is maximum
10 feet.
Pipeline must be accurately located to ensure that all
pipeline surfaces are within the zone of influence of
a sampling probe.
Probes must be installed per manufacturer's guidelines.
|
Comments
|
The
presence of a layer of water saturated soil, that is also
frozen, above the location where a leak may exist, may
inhibit the effectiveness of the method by impeding the
transport of the tracer labeled product into the unsaturated
zone.
Groundwater surrounding pipeline may limit effectiveness
of test method (e.g. when applied to pipelines containing
water-miscible products or products whose specific gravity
is greater than 1).
Test method may not be effective in some tank excavation
backfill (such as clay) because it may plug holes in pipeline
and retard tracer movement through the soil.
Third party evaluation of the ALD 2000 System tested the
device's ability to collect a sample, transport sample
through 2700 feet of 3/32 inch tubing, and analyze sample.
Sample collection, analysis, data storage, and alarm activation
is controlled by system's computer.
Prior evaluations tested PD, PFA, leak threshold, dose,
tracer movement through soil, and waiting times.
|
Linde Services, Inc.
|
Evaluator: Ken Wilcox Associates
|
3755
N. Business Center Dr.
|
Tel: (816) 443-2494
|
Tucson,
AZ 85705
|
Dates
of Evaluation:
10/04/91
,
06/19/99
|
Tel: (844) 445-4633
|
Evaluator: Control Strategies Engineering
- out of
business
|
E-mail: contactus@linde.com
|
Tel: Contact Linde Services, Inc.
|
URL: www.lindeservices.com
|
Date
of Evaluation: 05/92
|
Formerly Praxair Services, Incorporated. LG 113 name changed on October 1, 2020.
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