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Instrumentation Tubing

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  • Instrumentation Tubing for Pressure Transmitter Lines

Instrumentation Tubing

SIYelectric instrumentation tubing is engineered from high-quality stainless steel such as 304SS, 316SS, and 316LSS, meeting ASTM A269 and A213 standards. Known for superior corrosion resistance and mechanical reliability, it ranges from 1/8″ to 2″ (3mm to 50mm), with custom alloy options available. Ideal for diverse industrial applications, it ensures precise fittings, durability under high pressures, and compatibility with SIYelectric Tube Fitting Dual Ferrule fittings for efficient installation and sealing.

 

 

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Instrumentation Tubing Product Overview

SIYelectric Instrumentation Tubing is designed for pressure measurement lines, analyzer systems, sampling systems, hydraulic control lines, pneumatic systems, and general industrial process applications.

The tubing is commonly manufactured from stainless steel materials such as 304SS, 316SS, and 316LSS, with standards such as ASTM A269, ASTM A213, or equivalent specifications available according to project requirements. Proper annealing and surface treatment help improve corrosion resistance, mechanical performance, tube roundness, and sealing reliability when used with compression tube fittings.

Instrumentation tubing is often used together with pressure transmitters, differential pressure transmitters, pressure gauges, gauge valves, needle valves, manifolds, tube fittings, and analyzer systems.


How It Works in Instrument Systems

Application PointFunction
Pressure transmitter impulse linesTransfers process pressure from the tapping point to the transmitter
Differential pressure transmitter tubingConnects high-pressure and low-pressure sides to the DP transmitter or manifold
Analyzer sample linesCarries gas or liquid samples to analyzers and sampling panels
Calibration linesConnects instruments to calibration equipment or test ports
Hydraulic and pneumatic linesTransfers hydraulic oil, air, or control gas in control systems
Process skid tubingProvides compact routing for fluids, gases, and utility media

Compatible Instruments and Components

SIYelectric instrumentation tubing can be used with:

  • Pressure transmitters
  • Differential pressure transmitters
  • Pressure gauges
  • Pressure switches
  • Gauge valves
  • Needle valves
  • Ball valves
  • Check valves
  • Instrument manifolds
  • Male and female connectors
  • Union connectors
  • Elbows and tees
  • Sampling systems
  • Analyzer panels
  • Hydraulic and pneumatic control panels

For pressure measurement systems, instrumentation tubing is commonly used between the process tapping point, isolation valve, manifold, and transmitter.


Typical Application Scenarios

1. Pressure and Differential Pressure Measurement

Used as impulse tubing for pressure transmitters and DP transmitters in flow, level, filter differential pressure, and process pressure measurement.

Typical examples include:

  • Orifice plate DP flow measurement
  • Tank level measurement with DP transmitters
  • Filter pressure drop monitoring
  • Gauge pressure measurement lines
  • Remote instrument mounting

2. Sampling and Analyzer Systems

Used in gas sampling lines, liquid sampling lines, analyzer cabinets, laboratory systems, and process monitoring skids.

Common applications include:

  • Sample transport lines
  • Calibration gas lines
  • Purge gas lines
  • Analyzer inlet and outlet tubing
  • Laboratory testing systems

3. Hydraulic and Pneumatic Control Lines

Applied in hydraulic power units, pneumatic panels, actuator control systems, pressure test equipment, and industrial machinery.

The tubing provides a compact and reliable route for hydraulic oil, compressed air, nitrogen, control gas, or other compatible media.


4. Chemical and Petrochemical Process Systems

Used for transporting compatible chemicals, gases, condensate, utility fluids, and process samples in chemical plants and petrochemical units.

For corrosive media, the tubing material, wall thickness, pressure rating, and compatibility with tube fittings should be confirmed carefully.


5. Power and Energy Applications

Suitable for power plants, boiler auxiliary systems, turbine systems, steam and condensate measurement points, and energy industry process instrumentation.

In high-temperature or high-pressure applications, correct tube material, wall thickness, installation method, and impulse line arrangement are important for safe operation.


Material and Standard Options

ItemTypical Options
Material304SS, 316SS, 316LSS
StandardsASTM A269, ASTM A213, or equivalent
Tube TypeSeamless or welded tubing, depending on requirement
Surface ConditionAnnealed / pickled / polished options available
Typical UseInstrumentation, analyzer, hydraulic, pneumatic, process tubing
Connection CompatibilityCompression tube fittings, valves, manifolds, and instrument assemblies

Key Benefits

FeatureBenefit
Stainless steel materialProvides corrosion resistance and mechanical strength
ASTM standard optionsSupports project specification and documentation requirements
Annealed tubingImproves formability and tube fitting sealing performance
Multiple material gradesAllows selection for different media and environments
Compatible with tube fittingsSuitable for connectors, unions, elbows, tees, and manifolds
Suitable for instrument systemsWorks with transmitters, gauges, valves, and analyzers
Wide size availabilitySupports panels, skids, field instruments, and process piping

Selection Notes

Before selecting instrumentation tubing, confirm:

  • Tube outside diameter
  • Wall thickness
  • Material grade, such as 304SS, 316SS, or 316LSS
  • Seamless or welded requirement
  • Applicable standard, such as ASTM A269 or ASTM A213
  • Working pressure
  • Working temperature
  • Process medium
  • Corrosion requirement
  • Tube fitting compatibility
  • Whether it is used for pressure impulse lines, analyzer sampling, hydraulic, pneumatic, or process service

For pressure transmitter and DP transmitter installations, tube size, wall thickness, routing, slope, venting, draining, and support spacing should be considered according to the medium and measurement requirement.


Main Advantages

  • Suitable for pressure transmitter and differential pressure transmitter impulse lines.
  • Works with instrument manifolds, gauge valves, needle valves, tube fittings, and analyzer systems.
  • Stainless steel 304, 316, and 316L options support different corrosion and project requirements.
  • ASTM A269 and ASTM A213 options can meet common industrial tubing specifications.
  • Annealed tubing helps improve bending performance and compression fitting sealing.
  • Suitable for chemical, petrochemical, oil & gas, power, laboratory, analyzer, hydraulic, and pneumatic systems.
  • Available in different tube sizes, wall thicknesses, materials, and standards according to project requirements.

 

 

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