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Sample Cylinders for Petrochemical and Industrial Process Sampling

A sample cylinder is a portable pressure vessel used to collect, transport, and store representative gas or liquid samples from process streams, pipelines, wellheads, and laboratory systems. Sample cylinders must maintain sample integrity — preventing leakage, contamination, and phase change — from the point of collection through laboratory analysis. Wanan Technology manufactures ASME Section VIII and DOT certified stainless steel sample cylinders in a wide range of volumes, pressure ratings, and valve configurations for petrochemical, oil and gas, chemical, environmental, and laboratory applications worldwide.

Choosing the wrong sample cylinder — incorrect volume, inadequate pressure rating, or incompatible material — can result in sample loss, false analysis results, and safety incidents. Wanan sample cylinders are designed and tested to recognized international standards, with full material traceability and inspection documentation to satisfy the requirements of custody transfer, quality control, and regulatory sampling programs.

Key Features of Wanan Sample Cylinders

• ASME Section VIII U-stamp certification for sample cylinders operating above 15 psig, providing the pressure vessel design verification required by refineries, petrochemical plants, and EPC contractors.
• DOT / TC certified configurations for transport of pressurized gas and liquid samples in the United States, Canada, and internationally.
• 316L stainless steel standard with 304 SS, Hastelloy, and special alloy options for H2S, high-chloride, acid, and cryogenic service.
• End valve and combination valve configurations — single end valve, double end valve, and inline piston-equipped cylinders for representative sampling of two-phase streams.
• Floating piston (floating piston cylinder) design isolates the sample gas from a displacement fluid, allowing collection of gas samples at reservoir pressure without contamination from cylinder volume changes.
• Custom sizes from 10 mL to 10 L in standard and custom pressure ratings up to 5,000 psig to match process conditions and laboratory analytical requirements.

Types of Sample Cylinders

Wanan offers a complete range of sample cylinders to match the sample state, process conditions, and analytical method:

• Fixed volume (constant pressure) cylinder — the most common type for liquid and gas sampling. Fill the cylinder by pressurizing or flowing the sample in through a valve. Standard for closed loop sampling systems.
• Floating piston cylinder — contains a free-moving piston that separates the sample gas from a hydraulic displacement fluid, maintaining sample at constant pressure during transport and transfer. Used for reservoir fluid and condensate sampling.
• Coiled tube cylinder — uses a coiled tube inside the cylinder body to collect a large volume of liquid sample with high surface area for rapid temperature equilibration. Used in LPG and high-vapor-pressure sampling.
• Syringe pump / transfer cylinder — used to transfer pressurized samples from the field cylinder into a gas chromatograph or other analytical instrument under controlled pressure.

Sample cylinders are typically used as part of a complete closed loop sampling system, connected to the process via a sampling fitting or quill.

Especificaciones

Aplicaciones

Wanan sample cylinders are used wherever representative samples must be collected and transported at process pressure and temperature:

• Crude oil, condensate, and NGL pipeline custody transfer sampling
• Refinery process stream quality control (feed, product, intermediate streams)
• Natural gas and process gas composition analysis (GC sampling)
• Environmental and regulatory compliance sampling (soil gas, stack emissions)
• Pharmaceutical and specialty chemical process monitoring
• Laboratory reference sample storage and calibration gas preparation

Certificaciones y normas

Wanan sample cylinders are manufactured and tested to internationally accepted pressure vessel and transport standards:

• Sección VIII de la ASME — pressure vessel design, fabrication, and inspection, with U-stamp and National Board registration for cylinders operating above 15 psig.
• DOT / TC (49 CFR) — U.S. and Canadian Department of Transportation certification for transport of pressurized gas and liquid samples by road, rail, and air.
• TPED (2010/35/EU) — Transportable Pressure Equipment Directive for transport within the EU and EEA; required for European lab and field sampling applications.
• EAC (Unión Aduanera de la República de Tanzania) — Eurasian Conformity marking for Russia, Kazakhstan, Belarus, and other CIS markets.
• ASTM D3700 / ISO 10715 — sampling standards covering sample cylinder selection and use for natural gas and LPG streams.

How to Select a Sample Cylinder

1. Determine sample phase and pressure. Liquid, gas, or two-phase service requires different valve configurations and may require a floating piston for two-phase samples.
2. Choose volume. Select cylinder volume based on the analytical method minimum sample size plus a safety margin for purging and sample retention.
3. Select pressure rating. Cylinder MAWP must exceed maximum process pressure plus a safety factor. High-pressure applications may require 3,000 or 5,000 psig rated cylinders.
4. Specify material. SS 316L is standard for most applications. H2S-rich, high-temperature, or chemically aggressive streams require Hastelloy, Duplex SS, or special alloy bodies.
5. Choose valve configuration. Single or double end valve, with needle valves, block valves, or combination purge/sample valve sets to match the sampling procedure and analyzer connection.
6. Confirm certification requirements. ASME, DOT, TPED, or EAC as required by project jurisdiction and transport regulations.

Preguntas frecuentes

Ponte en contacto con Wanan Technology for a sample cylinder quotation or technical support.