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DynaPak 3010RNM Version 01102001 ATEX Rev.
YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
Diagram #8: DuraSite Portable Sample Vessel Instructions
Purpose: The DuraSite Portable Sample Vessel permits the
user to remove a liquid or gas hydrocarbon sample from a
pipeline or a sampling device. This is accomplished without
changing the pressure of the product or exposing it to a
contaminant fluid. If properly used and maintained the DuraSite
will provide many years of safe, accurate and clean sampling.
Use: The DuraSite is a very safe device to use. As with any
equipment dealing with flammable products, it is mandatory
that a good, thorough operator training procedure be
established prior to use.
Typical use of the cylinder would be as follows:
Step 1: (In The Lab) Connect a regulated inert gas supply to
the pre-charge valve. The product valve should be open. By
carefully controlling the pre-charge valve and the regulator, the
cylinder can be slowly charged with pre-charge gas (NOTE:
This should be done slowly to prevent slamming the piston
down to the opposite end). The pressure on the pre-charge
pressure gauge should be brought to a reading of 10-50 psi
above the expected pressure of the product in the field. Close
the pre-charge valve and disconnect the gas supply. Check the
pre-charge valve, relief device, and the pre-charge pressure
gauge for leaks. Any leaks should be stopped before
continuing. The vessel should be placed in a padded carrying
case and made ready for field use.
USE STEP 2 FOR COLLECTION OF SAMPLE VIA SPOT SAMPLE
OR FROM COMPOSITE ACCUMULATOR VESSEL.
Step 2a: Connect the pre-charged sample vessel to the
product supply (NOTE: the pre-charge pressure gauge
reading should be greater than the product supply pressure
reading. If not, repeat Step 1 above).
Step 2b: Once the vessel is connected to the product supply,
it is necessary to vent a small amount of product prior to filling
the vessel. This assures fresh product and removes any air or
gas when dealing with liquids. This can be done by loosening
the product purge valve a very small amount until the product
is purged. After thorough purging, the product purge valve
should be tightened.
Step 2c: The product pressure gauge reading should be
10-50 psi below the pre-charge pressure gauge reading. By
carefully opening the pre-charge valve, the pressure becomes
equalized. The pre-charge valve should be carefully controlled
so as to not vent the pre-charge gas too fast. The pre-charge
port should then be connected to a pipeline connection or relief
valve, which will allow movement of the piston while
maintaining pre-charge on the cylinder.
Step 2d: When the cylinder becomes a maximum of 80% full
(see volume indicator), all valves should be closed. The
product connection is slowly broken in order to vent any trapped
product. After vessel removal, all connections should be
checked for leaks and the pre-charge and product valve ports
capped to prevent leakage.
Step 2e: The vessel should be labeled and placed back into
the padded case and made ready for shipment.
USE STEP 3 FOR DIRECT CONNECTION TO SAMPLER.
Step 3a: Connect the sample discharge port to the sampler to
the product inlet port to the DuraSite using 1/8" stainless steel
tubing.
Step 3b: (Gas sampling) Connect the pre-charge port to the
DuraSite to the pipeline for pre-charge pressure, or configured
like the liquid sample application below. (Proceed to step 3d)
Step 3c: (Light sampling) Pre-charge the DuraSite as
indicated in Step 1, then install a pressure relief valve to the
pre-charge port and open the pre-charge valve on the DuraSite.
(The pressure relief valve should have a relief pressure setting
of approximately 100 psi above line pressure.)
Step 3d: Open the product inlet valve of the DuraSite and the
purge valve on the sampler. Next open the purge valve on the
product end of the DuraSite and allow product to purge all lines
and connections out.
Step 3e: Close purge valve and begin sample cycle.
Step 3f: At the end of sample cycle, close product inlet valve on
the DuraSite and remove the DuraSite. Pack the DuraSite in
appropriate carrying case to meet D.O.T. guideline, with D.O.T.
paperwork and transport to lab for analysis.
Step 4: (In The Lab) Prior to analysis, the product should be
mixed. This is accomplished simply and efficiently by inverting
the cylinder end-over-end, causing the mixing ball to fall
through the product. Approximately 10-12 trips of the mixing ball
through the product assures a homogenous solution.
Step 5: The regulated pre-charge gas should be reconnected
to the pre-charge side of the cylinder. The pre-charge gas
supply should remain open during analysis.
Step 6: Purging a small amount of product from the vessel
removes unmixed product from the tee, relief device, gauge,
etc. The unit can now be connected to a chromatograph and
the product analyzed.
Step 7: After analyzing, the remainder of the product should be
dumped and the vessel properly cleaned. Normal cleaning can
be accomplished by rinsing the product end with a petroleum
solvent and flushing with acetone. If a more thorough cleaning
is required, the vessel should be disassembled.
WARNING: A portable sample vessel should never be filled
to more than 80%. This allows a 20% pre-charge cushion to
absorb thermal expansion of the product.
Shipping: Extreme care should be taken when preparing a
vessel for shipment. Both valves should be capped to prevent
possible leakage. The vessel should be placed in a snug-
fitting, well-padded and durable case. All applicable DOT
regulations should be adhered to.