INSTALLATION & OPERATIONS
IOM-013
Page 9 of 18
CP2 & CP5GM
Rev: D
Last updated: 4/14/2011
2.4 S
POT
S
AMPLING
1.
Open the product purge valve on the sample
cylinder (see Figure 4) to purge the system of any
contaminants. Close the purge valve.
2.
After pre-charging the cylinder above pipeline
pressure (see Section 2.2), connect the product
inlet valve of the cylinder to the sampler outlet
port (see Figure 6).
3.
Slowly open the sampler outlet valve.
4.
Slowly open the product inlet valve on the product end cap of the sample
cylinder (see Figure 4). The piston will not yet move because pre-charge pressure
is above pipeline pressure.
5.
With the sampler valve and product valve fully open, slowly open the pre-charge
valve to relieve pre-charge pressure. This will allow the sampled product to enter
the cylinder and push against the piston. Thus, no pressure loss is encountered.
Relieving the pre-charge too quickly can result in a pressure drop and an
inaccurate sample. A bleed plug can be installed on the pre-charge valve to
regulate the relieving rate. The bleed plug will allow only a small amount of
pressure to exit; ensuring that pre-charge pressure is relieved steadily.
6.
When the desired amount of sample is extracted, close all valves on the cylinder.
7.
Close the probe outlet valve.
8.
Carefully disconnect the cylinder from the probe, allowing the trapped product between
the probe and cylinder valves to vent.
9.
Plug or cap all valves on the cylinder.
10.
Make a note of pressure, locations, etc., on the information tag according to company
policy.
11.
Check all fittings for leaks.
12.
The cylinder is now ready for product removal.
2.5 C
ONTINUOUS
S
AMPLING
1.
Pre-charge the sample cylinder (see Section 2.2) and connect the product inlet end (see
Figure 4) of the cylinder to the sampler outlet port.
2.
Open the product purge valve on the sample cylinder to purge the system of any
contaminants. Close the purge valve. Welker recommends plugging the purge valve when
not in use.
3.
Open the sampler outlet valve.
4.
Slowly open the product valve on the product end cap of the sample cylinder. The piston
will not yet move because pre-charge pressure is above pipeline pressure.
The automatic sampler will push product against the piston, causing the pre-charge
pressure to relieve from the adjustable relief and/or to be pushed into the pipeline.
Figure 6 -
Product Inlet
to Sampler
Outlet