California Code of Regulations
Title 13 - Motor Vehicles
Division 3 - Air Resources Board
Chapter 5 - Standards for Motor Vehicle Fuels
Article 4 - Sampling and Test Procedures
Section 2296 - Motor Fuel Sampling Procedures
Universal Citation: 13 CA Code of Regs 2296
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) "Scope." This method covers procedures for obtaining representative samples of motor fuel and blending components used to make motor fuel.
(b) "Summary of method." It is necessary that the samples be truly representative of the product in question. The precautions required to ensure the representative character of the samples are numerous and depend upon the tank, carrier, container or line from which the sample is being obtained, the type and cleanliness of the sample container, and the sampling procedure that is to be used. A summary of the sampling procedures and their application is presented in Table 1. Each procedure is suitable for sampling a material under definite storage, transportation, or container conditions. The basic principle of each procedure is to obtain a sample in such manner and from such locations in the tank or other container that the sample will be truly representative of the product.
(c) "Description of terms."
(1) "Average sample" is one that
consists of proportionate parts from all sections of the container.
(2) "All-levels sample" is one obtained by
submerging a stoppered beaker or bottle to a point as near as possible to the
draw-off level, then opening the sampler and raising it at a rate such that it
is about 3/4 full (maximum 85 percent) as it emerges from the liquid. An
all-levels sample is not necessarily an average sample because the tank volume
may not be proportional to the depth and because the operator may not be able
to raise the sampler at the variable rate required for proportionate filling.
The rate of filling is proportional to the square root of the depth of
immersion.
(3) "Running sample" is
one obtained by lowering an unstoppered beaker or bottle from the top of the
liquid to the level of the bottom of the outlet connection or swing line, and
returning it to the top of the liquid at a uniform rate of speed such that the
beaker or bottle is about 3/4 full when withdrawn from the liquid.
(4) "Spot sample" is one obtained at some
specific location in the tank by means of a thief bottle, or beaker.
(5) "Top sample" is a spot sample obtained 6
inches (150 mm) below the top surface of the liquid (Figure 1).
(6) "Upper sample" is a spot sample taken at
the mid-point of the upper third of the tank contents (Figure 1).
(7) "Middle sample" is a spot sample obtained
from the middle of the tank contents (Figure 1).
(8) "Lower sample" is a spot sample obtained
at the level of the fixed tank outlet or the swing line outlet (Figure
1).
(9) "Clearance sample" is a
spot sample taken 4 inches (100 mm) below the level of the tank outlet (Figure
1).
(10) "Bottom sample" is one
obtained from the material on the bottom surface of the tank, container, or
line at its lowest point.
(11)
"Drain sample" is one obtained from the draw-off or discharge valve.
Occasionally, a drain sample may be the same as a bottom sample, as in the case
of a tank car.
(12) "Continuous
sample" is one obtained from a pipeline in such manner as to give a
representative average of a moving stream.
(13) "Mixed sample" is one obtained after
mixing or vigorously stirring the contents of the original container, and then
pouring out or drawing off the quantity desired.
(14) "Nozzle sample" is one obtained from a
motor fuel service station pump nozzle which dispenses motor fuel from a
underground storage tank.
(15)
"Motor fuel" shall mean, for the purpose of this sampling procedure, gasoline
(including gasoline containing oxygenates), diesel fuel, or any blending
components that are used to make such fuel.
(d) "Sample containers."
(1) Sample containers may be clear or brown
glass bottles, or cans. The clear glass bottle is advantageous because it may
be examined visually for cleanliness, and also allows visual inspection of the
sample for free water or solid impurities. The brown glass bottle affords some
protection from light. The only cans permissible are those with the seams
soldered on the exterior surface with a flux of rosin in a suitable solvent.
Such a flux is easily removed with gasoline, whereas many others are very
difficult to remove.
(2) "Container
closure." Cork or glass stoppers, or screw caps of plastic or metal, may be
used for glass bottles; screw caps only shall be used for cans to provide a
vapor-tight closure seal. Corks must be of good quality, clean and free from
holes and loose bits of cork. Never use rubber stoppers. Contact of the sample
with the cork may be prevented by wrapping tin or aluminum foil around the cork
before forcing it into the bottle. Glass stoppers must be a perfect fit. Screw
caps must be protected by a disk faced with tin or aluminum foil, or other
material that will not affect petroleum or petroleum products.
(3) "Cleaning procedure." All sample
containers must be absolutely clean and free of water, dirt, lint, washing
compounds, naphtha, or other solvents, soldering fluxes or acids, corrosion,
rust, and oil. Before using a container, rinse it with Stoddard solvent or
other naphtha of similar volatility. (It may be necessary to use sludge
solvents to remove all traces of sediment and sludge from containers previously
used.) Then wash the container with strong soap solution, rinse it thoroughly
with tap water, and finally with distilled water. Dry either by passing a
current of clean, warm air through the container or by placing it in a hot
dust-free cabinet at 104 degrees Fahrenheit (40 degrees centigrade) or higher.
When dry, stopper or cap the container immediately.
(e) "Sampling apparatus." The sampling apparatus is described in detail under each of the specific sampling procedures. Clean, dry, and free all sampling apparatus from any substance that might contaminate the material, using the procedure described in (d)(3).
(f) "Time and place of sampling." When loading or discharging product, take samples from both shipping and receiving tanks, and from the pipeline if required.
(1) "Ship or barge tanks." Sample each
product after the vessel is loaded or just before unloading.
(2) "Tank cars." Sample the product after the
car is loaded or just before unloading.
NOTE: When taking samples from tanks suspected of containing flammable atmospheres, precautions should be taken to guard against ignitions due to static electricity. Metal or conductive objects, such as gage tapes, sample containers, and thermometers, should not be lowered into or suspended in a compartment or tank which is being filled or immediately after cessation of pumping. A waiting period of approximately one minute will generally permit a substantial relaxation of the electrostatic charge; under certain conditions a longer period may be deemed advisable.
(g) "Obtaining samples."
(1) Directions for
sampling cannot be made explicit enough to cover all cases. Extreme care and
good judgment are necessary to ensure samples that represent the general
character and average condition of the material. Clean hands are important.
Clean gloves may be worn but only when absolutely necessary, such as in cold
weather, or when handling materials at high temperature, or for reasons of
safety. Select wiping cloths so that lint is not introduced, contaminating
samples.
(2) As many petroleum
vapors are toxic and flammable, avoid breathing them or igniting them from an
open flame or a spark produced by static.
(3) When sampling relatively volatile
products (more than 2 pounds (0.14 kgf/cm2) RVP),
the sampling apparatus shall be rinsed and allowed to drain before drawing the
sample. If the sample is to be transferred to another container, this container
shall also be rinsed with some of the volatile product and then drained. When
the actual sample is emptied into this container, the sampling apparatus should
be upended into the opening of the sample container and remain in this position
until the contents have been transferred so that no unsaturated air will be
entrained in the transfer of the sample.
(h) "Handling samples."
(1) "Volatile samples." It is necessary to
protect all volatile samples of product from evaporation. Transfer the product
from the sampling apparatus to the sample container immediately Keep the
container closed except when the material is being transferred. When samples of
more than 16 pounds (1.12 kgf/cm2) RVP are being
obtained, be sure to use containers strong enough to meet local safety
regulations. After delivery to the laboratory, volatile samples should be
cooled before the container is opened.
(2) "Container outage." Never completely fill
a sample container, but allow adequate room for expansion, taking into
consideration the temperature of the liquid at the time of filling and the
probable maximum temperature to which the filled container may be
subjected.
(i) "Shipping samples." To prevent loss of liquid and vapors during shipment, and to protect against moisture and dust, cover the stoppers of glass bottles with plastic caps that have been swelled in water, wiped dry, placed over the tops of the stoppered bottles, and allowed to shrink tightly in place. The caps of metal containers must be screwed down tightly and checked for leakage. Postal and express office regulations applying to the shipment of flammable liquids must be observed.
(j) "Labeling sample containers."
(1) Label the container
immediately after a sample is obtained. Use waterproof and oilproof ink or a
pencil hard enough to dent the tag, since soft pencil and ordinary ink markings
are subject to obliteration from moisture, oil smearing, and handling. Include
the following information:
(A) Date and time
(the period elapsed during continuous sampling),
(B) Name of the sample,
(C) Name or number and owner of the vessel,
car, or container,
(D) Brand and
grade of material, and
(E)
Reference symbol or identification number.
(k) "Sampling procedures." The standard sampling procedures described in this method are summarized in Table 1. Alternative sampling procedures may be used if a mutually satisfactory agreement has been reached by the parties involved and such agreement was put in writing and signed by authorized officials.
(1) "Bottle or beaker sampling." The bottle
or beaker sampling procedure is applicable for sampling liquids of 16 pounds
(1.12 kgf/cm2) RVP or less in tank cars, tank
trucks, shore tanks, ship tanks, and barge tanks.
(A) "Apparatus." A suitable sampling bottle
or beaker as shown in Figure 2 is required. Recommended diameter of opening in
the bottle or beaker is 3/4 inch (19 mm).
(B) "Procedure."
1. "All-levels sample." Lower the weighted,
stoppered bottle or beaker as near as possible to the draw-off level, pull out
the stopper with a sharp jerk of the cord or chain and raise the bottle at a
uniform rate so that it is about 3/4 full as it emerges from the
liquid.
2. "Running sample." Lower
the unstoppered bottle or beaker as near as possible to the level of the bottom
of the outlet connection or swing line and then raise the bottle or beaker to
the top of the liquid at a uniform rate of speed such that it is about 3/4 full
when withdrawn from the liquid.
3.
"Upper, middle, and lower samples." Lower the weighted, stoppered bottle to the
proper depths (Figure 1) as follows:
| Upper sample.......................... | middle of upper third of the tank contents |
| Middle sample.......................... | middle of the tank contents |
| Lower sample.......................... | level of the fixed tank outlet or the swing-line outlet |
Pull out the stopper with a sharp jerk of the cord or chain and allow the bottle or beaker to fill completely at the selected level, as evidenced by the cessation of air bubbles. When full, raise the bottle or beaker, pour off a small amount, and stopper immediately.
4. "Top sample." Obtain this sample (Figure
1) in the same manner as specified in (k)(1)(B)3. but at 6 inches (150 mm)
below the top surface of the tank contents.
5. "Handling." Stopper and label bottle
samples immediately after taking them, and deliver to the laboratory in the
original sampling bottles.
(2) "Tap sampling." The tap sampling
procedure is applicable for sampling liquids of 26 pounds (1.83
kgf/cm2) RVP or less in tanks which are equipped
with suitable sampling taps or lines. This procedure is recommended for
volatile stocks in tanks of the breather and balloon roof type, spheroids, etc.
(Samples may be taken from the drain cocks of gage glasses, if the tank is not
equipped with sampling taps.) When obtaining a sample for RVP or distillation
analysis, use the assembly as shown in Figure 3. When obtaining a sample for
other than RVP or distillation analysis, the assembly as shown in Figure 3 need
not be used. NOTE: If RVP is more than 16 pounds (1.12
kgf/cm2) but not more than 26 pounds (1.83
kgf/cm2) a cooling bath as shown in section
(l)(6), Figure 5, shall be used between the tank tap and the
sample container to cool the sample and prevent volatilization of low-boiling
components.
(A) "Apparatus."
1. "Tank taps." The tank should be equipped
with at least three sampling taps placed equidistant throughout the tank
height. On tanks that are not equipped with floating roofs, each sample tap
should extend into the a minimum of 10 cm (4 in.). A standard 1/4 inch pipe
with suitable valve is satisfactory.
2. "Tube." A delivery tube that will not
contaminate the product being sampled and long enough to reach to the bottom of
the sample container is required to allow submerged filling. When a cooling
bath is used while tap sampling, a similar suitable tube should be used between
the tank tap and the cooler inlet.
3. "Sample containers." Use clean, dry glass
bottles of convenient size and strength to receive the samples. In some cases,
metal containers may be used instead of glass bottles.
(B) "Procedure."
1. Before a sample is drawn, flush the tap
(or gage glass drain cock) and line until they are purged completely. Connect
the clean delivery tube to the tap. Draw upper, middle, or lower samples
directly from the respective taps after the flushing operation. Stopper and
label the sample container immediately after filling, and deliver it to the
laboratory.
2. When a sample cooler
is used during the tap sampling operation, flush the tap (or gage glass drain
cock). Then, using a section of clean tubing, connect the tap to the cooler
inlet. Flush the cooler thoroughly, after which connect the clean delivery tube
to the cooler outlet and proceed with the sampling
operation.
(3)
"Continuous sampling." The continuous sampling procedure is applicable for
sampling liquids of 16 pounds (1.12 kgf/cm2) RVP or
less and semiliquids in pipelines, filling lines, and transfer lines. The
continuous sampling may be done manually or by using automatic devices.
(A) "Apparatus."
1. "Sampling probe." The function of the
sampling probe is to withdraw from the flow stream a portion that will be
representative of the entire stream. The apparatus assembly for continuous
sampling is shown in Figure 4. Probe designs that are commonly used are as
follows:
a. A tube extending to the center of
the line and beveled at a 45 degree angle facing upstream (Figure
4(a)).
b. A long-radius forged
elbow or pipe bend extending to the center line of the pipe and facing
upstream. The end of the probe should be reamed to give a sharp entrance edge
(Figure 4(b)).
c. A closed-end tube
with a round orifice spaced near the closed end which should be positioned in
such a way that the orifice is in the center of the pipeline and is facing the
stream as shown in Figure 4(c).
2. Since the fluid pumped may not in all
cases be homogeneous, the position and size of the sampling probe should be
such as to minimize stratification or dropping out of heavier particles within
the tube or the displacement of the product within the tube as a result of
variation in gravity of the flowing stream. The sampling probe should be
located preferably in a vertical run of pipe and as near as practicable to the
point where the product passes to the receiver. The probe should always be in a
horizontal position.
a. The sampling lines
should be as short as practicable and should be cleared before any samples are
taken.
b. A suitable device for
mixing the fluid flow to ensure a homogeneous mixture at all rates of flow and
to eliminate stratification should be installed upstream of the sampling tap.
Some effective devices for obtaining a homogeneous mixture are as follows:
Reduction in pipe size; a series of baffles; orifice or perforated plate; and a
combination of any of these methods.
c. The design or sizing of these devices is
optional with the user, as long as the flow past the sampling point is
homogeneous and stratification is eliminated.
3. To control the rate at which the sample is
withdrawn, the probe or probes should be fitted with valves or plug
cocks.
4. "Automatic sampling
devices" that meet the standards set out in (3)(A)5. may be used in obtaining
samples of gasoline. The quantity of sample collected must be of sufficient
size for analysis, and its composition should be identical with the composition
of the batch flowing in the line while the sample is being taken. An automatic
sampler installation necessarily includes not only the automatic sampling
device that extracts the samples from the line, but also a suitable probe,
connecting lines, auxiliary equipment, and a container in which the sample is
collected. Automatic samplers may be classified as follows:
a. "Continuous sampler, time cycle
(nonproportional) types." A sampler designed and operated in such a manner that
it transfers equal increments of liquid from the pipeline to the sample
container at a uniform rate of one or more increments per minute is a
continuous sampler.
b. "Continuous
sampler, flow-responsive (proportional) type." A sampler that is designed and
operated in such a manner that it will automatically adjust the quantity of
sample in proportion to the rate of flow is a flow-responsive (proportional)
sampler. Adjustment of the quantity of sample may be made either by varying the
frequency of transferring equal increments of sample to the sample container,
or by varying the volume of the increments while maintaining a constant
frequency of transferring the increments to the sample container. The apparatus
assembly for continuous sampling is shown in Figure 4.
c. "Intermittent sampler." A sampler that is
designed and operated in such a manner that it transfers equal increments of
liquid from a pipeline to the sample container at a uniform rate of less than
one increment per minute is an intermittent sampler.
5. "Standards of installation." Automatic
sampler installations should meet all safety requirements in the plant or area
where used, and should comply with American National Standard Code for Pressure
Piping, and other applicable codes (ANSI B31.1). The sampler should be so
installed as to provide ample access space for inspection and maintenance.
a. Small lines connecting various elements of
the installation should be so arranged that complete purging of the automatic
sampler and of all lines can be accomplished effectively. All fluid remaining
in the sampler and the lines from the preceding sampling cycle should be purged
immediately before the start of any given sampling operation.
b. In those cases where the sampler design is
such that complete purging of the sampling lines and the sampler is not
possible, a small pump should be installed in order to circulate a continuous
stream from the sampling tube past or through the sampler and back into the
line. The automatic sampler should then withdraw the sample from the sidestream
through the shortest possible connection.
c. Under certain conditions, there may be a
tendency for water and heavy particles to drop out in the discharge line from
the sampling device and appear in the sample container during some subsequent
sampling period. To circumvent this possibility, the discharge pipe from the
sampling device should be free of pockets or enlarged pipe areas, and
preferably should be pitched downward to the sample container.
d. To ensure clean, free-flowing lines,
piping should be designed for periodic cleaning.
6. "Field calibration." Composite samples
obtained from the automatic sampler installation should be verified for
quantity performance in a manner that meets with the approval of all parties
concerned, at least once a month and more often if conditions warrant. In the
case of time-cycle samplers, deviations in quantity of the sample taken should
not exceed ± 5 percent for any given setting. In the case of
flow-responsive samplers, the deviation in quantity of sample taken per 1,000
barrels of flowing stream should not exceed ± 5 percent. For the purpose
of field-calibrating an installation, the composite sample obtained from the
automatic sampler under test should be verified for quality by comparing on the
basis of physical and chemical properties, with either a properly secured
continuous nonautomatic sample or tank sample. The tank sample should be taken
under the following conditions:
a. The batch
pumped during the test interval should be diverted into a clean tank and a
sample taken within one hour after cessation of pumping.
b. If the sampling of the delivery tank is to
be delayed beyond one hour, then the tank selected must be equipped with an
adequate mixing means. For valid comparison, the sampling of the delivery tank
must be completed within eight hours after cessation of pumping, even though
the tank is equipped with a motor-driven mixer.
c. When making a normal full-tank delivery
from a tank, a properly secured sample may be used to check the results of the
sampler if the parties mutually agree to this procedure.
7. "Receiver." The receiver must be a clean,
dry container of convenient size to receive the sample. All connections from
the sample probe to the sample container must be free of leaks. Two types of
container may be used, depending upon service requirements.
a. "Atmospheric container." The atmospheric
container shall be constructed in such a way that it retards evaporation loss
and protects the sample from extraneous material such as rain, snow, dust, and
trash. The construction should allow cleaning, interior inspection, and
complete mixing of the sample prior to removal. The container should be
provided with a suitable vent.
b.
"Closed container." The closed container shall be constructed in such a manner
that it prevents evaporation loss. The construction must allow cleaning,
interior inspection and complete mixing of the sample prior to removal. The
container should be equipped with a pressure-relief
valve.
(B)
"Procedure."
1. "Nonautomatic sample."
a. Adjust the valve or plug cock from the
sampling probe so that a steady stream is drawn from the probe. Whenever
possible, the rate of sample withdrawal should be such that the velocity of
liquid flowing through the probe is approximately equal to the average linear
velocity of the stream flowing through the pipeline. Measure and record the
rate of sample withdrawal as gallons per hour. Divert the sample stream to the
sampling container continuously or intermittently to provide a quantity of
sample that will be of sufficient size for analysis.
2. "Automatic sampling." Purge the sampler
and the sampling lines immediately before the start of a sampling operation. If
the sample design is such that complete purging is not possible, circulate a
continuous stream from the probe past or through the sampler and back into the
line. Withdraw the sample from the side stream through the automatic sampler
using the shortest possible connections. Adjust the sampler to deliver not less
than 1 and not more than 40 gallons (151 liters) of sample during the desired
sampling period. For time-cycle samplers, record the rate at which sample
increments were taken per minute. For flow-responsive samplers, record the
proportion of sample to total stream. Label the samples and deliver them to the
laboratory in the containers in which they were
collected.
(4)
"Nozzle sampling." The nozzle sampling procedure is applicable for sampling
product from a service station underground storage tank.
(A) "Apparatus." Sample containers conforming
with (d)(1) should be used. A spacer, as shown in Figure 6, shall be used, if
appropriate. When obtaining a sample for RVP or distillation analysis, an ice
water bath and nozzle extension, as shown in Figure 7, shall be used. When
obtaining a sample for other than RVP or distillation analysis, neither the ice
water bath nor the nozzle extension need to be used.
(B) "Procedure."
1. When obtaining a sample for RVP or
distillation analysis, conduct the sampling in the following manner:
Immediately after gasoline has been delivered from pump and pump has been
reset, deliver a small amount of product into the sample container, using
spacer (Figure 6), if needed, on the pump nozzle (vapor recovery type). Rinse
sample container and dump product into waste container. Insert nozzle extension
(Figure 7) into sample container and insert pump nozzle into extension with
slot over air bleed hole (if the extension is equipped with a slot). Replace
sample container in chilling medium and fill slowly through nozzle extension to
70-80 percent full (Figure 8). Remove nozzle extension. Cap container at once.
Check for leaks. Discard container and resample if leak occurs. If container is
leak tight, place container in a cold chest of ice water.
2. When obtaining a sample for other than RVP
or distillation analysis, the following procedure may be used instead of the
procedure in (k)(4)(B)1: Immediately after product has been delivered from pump
and pump has been reset, deliver a small amount of product into the sample
container, using spacer (Figure 6), if needed, on the pump nozzle (vapor
recovery type). Rinse sample container and dump product into waste container.
Fill slowly with the nozzle to 70-80 percent full. Cap container at once. Check
for leaks. Discard container and resample if leak
occurs.
(l) "Special precautions and instructions for RVP Sampling."
(1) "Precautions." Vapor
pressures are extremely sensitive to evaporation losses and to slight changes
in composition. When obtaining, storing, or handling samples, observe the
necessary precautions to ensure samples representative of the product and
satisfactory for RVP tests. Official samples should be taken by, or under the
immediate supervision of a person of judgment, skill, and sampling experience.
Never prepare composite samples for RVP testing. Make certain that containers
which are to be shipped by common carrier conform to Interstate Commerce
Commission, state, or local regulations. When flushing or purging lines or
containers, observe the pertinent regulations and precautions against fire,
explosion, and other hazards.
(2)
"Sample containers." Use containers of not less than 1 quart (1 liter) nor more
than 2 gallons (7.5 liters) capacity, of sufficient strength to withstand the
pressures to which they may be subjected, and of a type that will permit
replacement of the cap or stopper with suitable connections for transferring
the sample to the gasoline chamber (if applicable) of the vapor pressure
apparatus. Open-type containers have a single opening which permits sampling by
immersion. Closed-type containers have two openings, one in each end (or the
equivalent thereof), fitted with valves suitable for sampling by water
displacement or by purging.
(3)
"Transfer connections." The transfer connection for the open-type container
consists of an air tube and a liquid delivery tube assembled in a cap or
stopper. The air tube extends to the bottom of the container. One end of the
liquid delivery tube is flush with the inside face of the cap or stopper and
the tube is long enough to reach the bottom of the gasoline chamber while the
sample is being transferred to the chamber. The transfer connection for the
closed-type container consists of a single tube with a connection suitable for
attaching it to one of the openings of the sample container. The tube is long
enough to reach the bottom of the gasoline chamber while the sample is being
transferred.
(4) "Sampling open
tanks." Use clean containers of the open type when sampling open tanks and tank
cars. An all-level sample obtained by the bottle procedure, (k)(1) is
recommended. Before taking the sample, flush the container by immersing it in
the product to be sampled. Then obtain the sample immediately. Fill to 70-80
percent and close it promptly. Label the container and deliver it to the
laboratory.
(5) "Sampling closed
tanks." Containers of either the open or closed type may be used to obtain
samples from closed or pressure tanks. If an open type container is used,
follow the cooling bath procedure described in (l)(7) or
(l)(10). If the closed type is used, obtain the sample using
the water displacement procedure, (l)(8), or the purging
procedure, (l)(9). The water displacement procedure is
preferable because the flow of product involved in the purging procedure may be
hazardous.
(6) "Cooling bath." A
bath (Figure 5) of sufficient size to hold the sample container and a cooling
coil of about 25 feet (8 m) of copper tubing ( 3/8 inch (9 mm) or less outside
diameter) shall be required when using the procedure described in
(l)(7). One end of the coil is provided with a connection for
attaching it to the tank sampling tap or valve. The other end is fitted with a
suitable valve (outlet) of good quality. A removable copper tube of 3/8 inch or
less outside diameter and of sufficient length to reach the bottom of the
sample container shall be connected to the open end of the outlet
valve.
(7) "Cooling bath
procedure." When using a cooling bath and a container of the open type, keep it
at a temperature of 32 degrees to 40 degrees Fahrenheit (0 degrees to 4.5
degrees centigrade) during the sampling operation by using the cooling bath
(Figure 5). Connect the coil to the tank sampling tap or valve and flush it
with a sufficient amount of product to ensure complete purging. When obtaining
a sample, throttle the outlet valve so that the pressure in the coil will be
approximately the same as that in the tank. Fill the container once to wash and
cool it, and discard the wash product. Then draw the sample immediately. Pour
off enough so that the container will be 70-80 percent full and close it
promptly. Label the container and deliver it to the laboratory.
(8) "Water displacement procedure."
Completely fill the closed-type container with water and close the valves. The
water should be at the same temperature or lower than that of the product to be
sampled. While permitting a small amount of product to flow through the
fittings, connect the top or inlet valve of the container to the tank sampling
tap or valve. Then open all valves on the inlet side of the container. Open the
bottom or outlet valve slightly to allow the water to be displaced slowly by
the sample entering the container. Regulate the flow so that there is no
appreciable change in pressure within the container. Close the outlet valve as
soon as gasoline discharges from the outlet; then in succession close the inlet
valve and the sampling valve on the tank. Disconnect the container and withdraw
enough of the contents so that it will be 70-80 percent full. If the vapor
pressure of the product is not high enough to force liquid from the container,
open both the upper and lower valves slightly to remove the excess. Promptly
seal and label the container, and deliver it to the laboratory.
(9) "Purging procedure." Connect the inlet
valve of the closed-type container to the tank sampling tap or valve. Throttle
the outlet valve of the container so that the pressure in it will be
approximately equal to that in the container being sampled. Allow a volume of
product equal to at least twice that of the container to flow through the
sampling system. Then close all valves, the outlet valve first, the inlet valve
of the container second, and the tank sampling valve last, and disconnect the
container immediately. Withdraw enough of the contents so that the sample
container will be 70-80 percent full. If the vapor pressure of the product is
not high enough to force liquid from the container, open both the upper and
lower valves slightly to remove the excess. Promptly seal and label the
container and deliver it to the laboratory.
(10) "Nozzle sampling procedure." When using
a container of the open type, keep it at a temperature of 32 degrees to 40
degrees Fahrenheit (0 degree to 4.5 degrees centigrade) when sampling by the
nozzle sampling procedure. The container may be chilled by placing it into an
ice chest containing ice (frozen water). The sampling is accomplished following
the procedure in (k)(4).
Table 1
Summary of Sampling Procedures and Applicability
|
Type of container |
Procedure |
Paragraph |
|
| Storage tanks, ship and barge tanks, tank cars, tank trucks | Bottle sampling | (k)(1) | |
| Storage tanks with taps Tap | sampling | (k)(2) | |
| Pipes and lines | Continuous line sampling | (k)(3) | |
| Service station under-ground storage tanks | Nozzle sampling | (k)(4) |
1. Change
without regulatory effect renumbering article heading and former section
2261 to section 2296 filed 9-17-91
pursuant to section
100, title 1, California Code of
Regulations (Register 92, No. 4).
2. Amendment of section heading,
subsections (a)-(c), (c)(3) and (c)(14), new subsection (c)(15), amendment of
subsections (d), (d)(2), (e)-(f), (g), (g)(3)-(h)(1), (i)-(k), (k)(1)(B)(2).,
(k)(2), and (k)(4)-((B)1., new subsection (k)(4)(B)2., amendment of subsections
(1)-(1)(7), Table 1, Figure 5, Figure 7, and NOTE filed 10-14-92; operative
10-14-92 pursuant to Government Code section
11346.2(d)
(Register 92, No. 42).
3. Amendment of subsections (k)(2)-(k)(2)(A)
and amendment of NOTE filed 8-20-2001; operative 8-20-2001 pursuant to
Government Code section
11343.4
(Register 2001, No. 34).
4. Amendment of subsection (k)(2) filed
12-24-2002; operative 12-24-2002 pursuant to Government Code section
11343.4
(Register 2002, No. 52).
Note: Authority cited: Sections 39600, 39601, 43013, 43018, 43101 and 43830, Health and Safety Code. Reference: Sections 39000, 39001, 39002, 39003, 39500, 41511, 43000, 43013, 43018, 43101 and 43830, Health and Safety Code; and Western Oil and Gas Ass'n v. Orange County APCD, 14 Cal. 3d 411, 121 Cal. Rptr. 249 (1975).
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