From start to finish, the Welker CP-2 Constant Pressure Cylinder is the container for the safe collection and transport of accurate
samples for laboratory analysis.
Pre-charging the CP-2 with an inert gas or pipeline gas allows the sample to be collected at pipeline pressure. No pressure drop during
sample collection protects against phase change and ensures sample integrity.
In the laboratory, connect a gas supply with pressure equal to pipeline pressure to the pre-charge side of the cylinder. As the sample
is injected into the analyzer, full pressure is maintained in the cylinder, thus ensuring a representative sample and repeatable results
for accurate billing.
Both ends of the CP-2 come equipped with valves, gauges, and pressure relieving devices. These safety measures allow the operator to
control and monitor the cylinder pressure and prevent the cylinder from overpressurizing. The tie bolts provide a secondary level of
safety; in the event of overpressurization, the tie bolts will stretch to allow pressure to relieve, preventing fragmentation of the
Achieve a uniform mix for accurate sample analysis using one of Welker’s mixers. The internal Vortex Mixer™, ideal for products that
stratify, ensures even distribution of the sample within the cylinder. Suitable for high viscosity products and products that stratify,
the mixing action of the vortex mixer creates spiral movement in the sample, which pulls the product toward the middle of the cylinder and
ensures a proper mix.
The CP-2 is designed as a DOT 3E cylinder and is transportable with special permit DOT-SP 7657. The high pressure CP-2 is designed as a
DOT 3A cylinder and is transportable with special permit DOT-SP 11054.
For added convenience, transport the CP-2 using a lockable Welker Carrying Case with carry handles and wheels. Cut to conform to your
cylinder, the internal PrecisionFoam™ stabilizes and protects your investment during travel.
The internal floating piston serves three purposes:
- Volume Indication
- Contamination Prevention
- Environmental Protection
As the cylinder fills with the sampled product, the piston moves, allowing product level to be easily monitored by referring to the
graduated scale or volume indicator rod.
As the cylinder is emptied, the piston wipes the cylinder walls clean and forces out any air and/or contaminants, preventing
cross-contamination between samples.
Pre-charging the cylinder prior to sample collection pushes the piston to the product side, meaning there is no large volume to purge.
The CP-2 eliminates the need for the fill and empty method and thus prevents large volumes of gas from being vented to the atmosphere.