2.4 Composite Sampling
1.
If the LS-14 is equipped with inert gas supply valve configuration option 1, ensure that valves A and C on the inert gas
supply tank are open (
). If the LS-14 is equipped with inert gas supply valve configuration option 2, ensure that
valve A on the inert gas supply tank is open (
).
Valves A and C on the inert gas supply tank must remain open for the duration of composite sampling.
2.
Ensure that sample container isolation valve E is open (
, or
).
If sample container isolation valve E is not open, product will vent through the relief valve instead of entering the LS-14.
3.
As necessary, ensure that the EHUC is ON (
).
4.
Ensure that the pipeline connection is open and sample is flowing to the sample receiver.
5.
For sampling operation procedures, refer to the
Installation, Operation, and Maintenance
(IOM)
Manual
for the sampler.
6.
The magnetic volume indicator on the LS-14 should begin to rise as product fills the LS-14.
7.
Allow the LS-14 to fill to the desired volume, not to exceed 80%.
Never fill the cylinder above 80% of its capacity. Allow at least 20% room for product expansion should the cylinder be exposed
to increased temperatures.
Withdrawing Product for Transportation After Composite Sampling
Welker recommends the following transportable containers for use with this unit:
• Welker Constant Pressure Cylinders for light liquid products;
• Welker Constant Pressure Cylinders or chilled containers for Reid vapor pressure (RVP) testing; and
• capped metal or amber glass containers of the appropriate volume for retain samples.
8.
As necessary, turn OFF and isolate the sampler from the LS-14.
9.
To transfer sampled product to a constant pressure cylinder for laboratory analysis, connect the product side of the
constant pressure cylinder to composite sample draw off valve F (
,
, or
). The cylinder should
have a pre-charge pressure of approximately 100 psig above the product pressure in the LS-14. Refer to the
Installation,
Operation, and Maintenance
(IOM)
Manual
for the constant pressure cylinder for pre-charging instructions.
10.
Prior to withdrawing sampled product from the LS-14, the operator should manually cycle the mixer four to five times
(4–5x). If the LS-14 is equipped with a pneumatic mixer, alternately press and release the mixer button on the side of
the LS-14 (
). If the LS-14 is equipped with a hydraulic mixer, alternately hold up and release the
mixer lever on the EHUC (
).
11.
With sample container isolation valve E open, open composite sample draw off valve F on the LS-14, and then open the
inlet valve on the constant pressure cylinder (
, or
).
12.
Slowly open the product purge valve on the constant pressure cylinder to purge any air. Shut the valve completely once
liquid begins to purge.
13.
Actuate the mixer for another three to four (3–4) complete cycles.
20
IOM-131
MODEL: LS-14
REV: F
13839 West Bellfort Street, Sugar Land, TX 77498
welker.com
Service Department 281.491.2331