Container type
Sample cylinder – the GSM system is for samples with a vapor pressure above 14.7 PSIa (1.01 Bara) at ambient conditions. The GSM uses pressure-rated sample cylinders which prevent the sample from escaping, even under pressure, and are durable to prevent accidental breakage. The GSM is the most reliable method of capturing a sample.
Bottle sampling – the GSL system is for samples with a maximum vapor pressure of 14.7 PSIa (1.01 Bara) at ambient conditions. The design allows for the use of less expensive glass laboratory bottles to draw and store the sample. Using bottles also provides immediate feedback on the visual quality of the sample stream.
Collaboration
Ensuring your grab sampling system is suitable for your particular purpose is key. Temperature, pressure, phase, container type, materials of construction, and where the panel will be installed are just a few of the criteria to consider in order to properly specify a grab sampling system.
Our team takes you through a checklist of details to ensure the panel we recommend will meet your system needs. The product selection matrix (below on this page) provides some common system criteria that may help you with the decision making process. Next, a certified expert will review your information and recommend a panel per your requirements.
Specification
Using our standard panel designs as a platform, we can work with your team to substitute comparable Swagelok and non-Swagelok products if necessary; add products within the existing schematics, sample coolers, flow meters, shut-off valves, drain valves, etc; and make changes in the layout.
If needed we can make structural changes/additions panel/bracket materials, enclosures, etc.; convert to larger/smaller tube size (or metric); and recommend alternate materials of construction. Likewise, we can make flow/pressure drop calculations (and make changes based on results) and/or recommend sizing of sample coolers/heaters and enclosure heaters (using vendors’ applications engineering).
Simultaneous control of fluid routing
A key feature of the GSM is the switching valve that directs flow. Using the Swagelok 40G series ball valve for this switching valve, configurations are available with either 2 or 3 valves.
Simultaneous control of fluid routing means fewer steps required to draw a sample. The likelihood of errant sampling is reduced and a clear indication of sequencing is provided to the operator. This valve assembly is a standard on all GSM panels as well as fixed volume GSL panels.
Closed-loop system
The closed-loop sampling system pulls from a positive-pressure process and returns back to the process at a lower pressure location (e.g., upstream of a pump), using the differential pressure to drive the fluid through the sample system. This circuit draws a flow path that connects to the sampler then returns to the process or to flare.
With some arrangements a GSM can be left in the bypass or sample position indefinitely, keeping the transport lines fresh (with zero flushing time) and ready for sample capture. A rupture disc is an available option for every GSM system. A relief valve can also be added to the sampling systems.
Liquid sampling using glass
The GSL design allows for the use of less expensive glass laboratory bottles to draw and store the sample. Using bottles also provides immediate feedback on the visual quality of the sample stream. Swagelok GSL systems use the same switching valve as a GSM system to provide simplified operation for complex tasks. The GSL systems also include Sentry Equipment’s Model MVS to draw a sample into a bottle.
Outage tubes
- Made from 316 stainless steel or alloy 400 tubing
- Offered in 1/4 or 1/2 in NPT sizes
- Marked "Outage Tube" for identification
Nonrotating-stem needle valves
- Compact, rugged design is available in straight and angle flow patterns
- Protective handle prevents contaminants from entering functional valve parts
- Orifice sizes from 0.093 to 0.218 in. (2.4 to 5.6 mm) are available.
- Flow coefficients (Cv) from 0.12 to 0.53 are available
- Female NPT, male NPT, Swagelok tube fitting, and mixed end connections are available
- Pressures up to 3000 psig (206 bar)
- Temperatures up to 450°F (232°C) with PEEK stem tip
- Stainless steel, brass and alloy 400 materials
Rupture disc units
Swagelok rupture disc units protect sample cylinders from over pressurization by venting the cylinder contents to atmosphere. The use of a rupture disc is recommended with chemicals that may rapidly expand and pressurize due to temperature changes.
The rupture disc is welded to a body that is threaded into a valve body or a rupture disc tee and sealed by an elastomer O-ring. The rupture disc can be easily replaced without removing the valve or the tee from the cylinder.
Carrying handles
The carrying handle is an optional purchase that provides a convenient and safe way to carry sample cylinders. The handle is constructed of 304 stainless steel and is available for use on 300 cm3 and larger cylinders.
