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Sampling Fittings for Petrochemical Process Connections

Sampling fittings are the valves, probes, quills, connectors, and manifold components that connect a process stream to a sampling system. The quality and design of sampling fittings directly determines whether the collected sample is representative of the actual process fluid — contamination, dead legs, improper probe insertion depth, and inadequate purging all result in biased samples that lead to wrong product quality decisions and costly reanalysis. Wanan Technology manufactures stainless steel sampling fittings designed for high-pressure, high-temperature, and corrosive petrochemical service, providing the reliable process connections that ensure every closed loop sampling system performs as intended.

From the sample probe inserted in the pipe to the needle valve at the sample cylinder, each fitting in the sample path must maintain process integrity while being easy to purge, drain, and maintain in service. Wanan sampling fittings are designed and manufactured to match Wanan sampling systems or as drop-in replacements for existing sample point installations from other manufacturers.

Key Features of Wanan Sampling Fittings

• 316L stainless steel standard construction provides corrosion resistance for crude oil, refined products, and chemical streams. Hastelloy and Duplex options available for aggressive service.
• Isokinetic sample quill design positions the sample probe at the pipe centerline and at the correct insertion angle for representative sampling in accordance with ASTM D4057 and ISO 3170.
• Low dead volume valve design minimizes the volume of process fluid retained in the valve body, reducing purge time and improving sample turnover between consecutive samples.
• Anti-tamper locking provisions on needle valves and block valves protect sample integrity by preventing unauthorized access to the sample stream.
• Pressure-rated connections — socket weld, butt weld, and NPT/BSPP threaded ends available for pressures from 150 lb to 2,500 lb ANSI class, compatible with existing sampling system piping.
• Full documentation package including material certificates (EN 10204 3.1 or 3.2), pressure test records, and dimensional inspection reports available for each fitting lot.

Types of Sampling Fittings

A complete sample connection typically includes several components working together to capture and deliver a representative sample:

• Sample probe / quill — inserted through a process pipe nozzle to the centerline of the flow stream. Isokinetic probes match the sample capture velocity to the process velocity, critical for accurate sampling of multi-phase or suspended particle streams.
• Isolation valve (block valve) — the primary shutoff valve at the process connection that allows the sampling system to be isolated for maintenance or cylinder change without process shutdown.
• Needle valve — provides fine flow control for sample purging and filling. Low dead volume needle valves minimize the amount of retained fluid between the block valve and the sample cylinder.
• Check valve — prevents reverse flow from the sample cylinder back into the process or from cross-contaminating adjacent sample streams.
• Sample cooler inlet connection — thermowell fitting and connection hardware for integrating a sampling cooler at the process tap, used for high-temperature stream sampling.
• Sample manifold — multi-port distribution block that connects the process connection to multiple sample cylinders or analytical instruments for simultaneous or sequential sampling.

Sampling fittings are supplied as individual components or as pre-assembled sample connection kits to match specific Wanan sampling system configurations.

Especificaciones

Aplicaciones

Wanan sampling fittings are used in critical sampling points across refining, petrochemical, and chemical processing:

• Crude oil pipeline custody transfer sampling probes
• Refinery process unit feed and product stream sample points
• LNG and LPG terminal loading arm sample connections
• Chemical reactor feed, product, and recycle stream sampling
• Environmental monitoring and stack emission sampling
• Laboratory sample injection and preparation connections

Certificaciones y normas

Wanan sampling fittings are manufactured to internationally recognized process valve and sampling standards:

• ISO 9001 — Quality management system covering design, manufacture, and inspection of all fitting components.
• ASTM D4057 / ISO 3170 — Manual sampling standards that define probe geometry, insertion depth, and connection requirements for representative liquid sampling.
• ASME B16.34 — Valves — Flanged, Threaded, and Welding End for pressure-rated isolation and needle valves.
• EN 10204 3.1 / 3.2 — Material certification traceable to heat lot for all wetted components, required by major oil company and EPC contractor purchase orders.

How to Specify Sampling Fittings

1. Definir las condiciones del proceso. Fluid type, pressure, temperature, and flow velocity determine probe dimensions, valve pressure rating, and material selection.
2. Select probe insertion method. Hot tap (under pressure), cold tap (shutdown), or retractable probe for process streams that cannot be shut down for maintenance.
3. Choose valve type. Needle valve for flow control, block valve for isolation, and check valve for backflow prevention — all matched to the same pressure class.
4. Specify connection ends. Socket weld, NPT, BSPP, or compression fitting to match the sampling system tubing and pipe schedule.
5. Confirm material and certification requirements. EN 10204 3.1 or 3.2 material certification, ATEX marking, or EAC approval as required by the project specification.

Preguntas frecuentes

Ponte en contacto con Wanan Technology for sampling fittings quotation or technical support.