SWAS Systems

Mechatest is a global company and well known for it’s excellent quality water and steam sampling and analysis solutions built as per ASME PTC 19.11.

The Steam and Water Analysis Systems (SWAS) are designed with worlds best-in-class instrumentation parts to keep the reability of your water steam analysis safe at all times and to protect your plant from corrosion and scaling. 

As an independent System Integrator our main activities are the complete design, engineering, procurement, assembly and integration of steam and water sampling, conditioning, and analysis systems for the power cycle industry, we design accordingly to ASME PTC 19.11 which discuss the methods and instrumentation for testing boiler make-up and feedwater, steam, and condensate in relation to performance testing. 

Mechatest is taking care of the following sections;

• Section 2: Sample Point and Analysis Selection Criteria
• Section 3: Obtaining the Sample (we can make probe vibration calculations and help you select standard or Isokinetic sampling nozzle)
• Section 4: Transporting the Sample (we can make lagtime, liquid velocities and pressure loss calculations and help you select best sample transport tube sizing in combination with the desired sample flow rate)
• Section 5: Sample Conditioning 
• Section 6: Sample Analysis and Instrumentation (we are independent and can select best analyser fabricate and analysis for your application in general purpose area or Explosion proof area)

As a result, you save maintenance costs, minimize downtime and prolong the operational life for your plant. 

Low Pressure, Low Temperature Steam Sample Panel

Low Pressure, High Temperature Steam Sample Panel

High Pressure, Low Temperature Steam Sample Panel

High Pressure, High Temperature Steam Sample Panel

High Pressure, High Temperature Steam Sample Panel

High Pressure, High Flow Steam Sample Panel

• Multi stream (up to 4) analysers

High Pressure, High Flow Steam Sample Panel

• Multi stream (up to 6) analysers

• Single Helical Tube Sample Cooler
• Compact, high efficiency sample coolers for cooling high temperature/high pressure liquid or gas samples
• Temperature ratings to 593°C at 345 barg (1100°F at 5000 psig)
• Models available for ultra-supercritical power plants with temperature ratings to 621°C at 356 barg (1150°F at 5175 psig)
• Exotic materials such as titanium, Inconel® and Hastelloy® on the tube side, and Monel®, cupronickel, and stainless steel on the shell side are available
• Highest efficiency sample cooler commercially available
• Various configurations available to meet EPRI/ASTM/ASME sampling guidelines
• Many models are available with ASME section VIII code stamp, CE or CRN registrations
• No dead spots or crevices 
• Sample flow rates up to 5.7 liters per minute (1.5 gallons per minute GPM); for higher flow rates see

• High Pressure Sample Flow Control Valve
• The VREL® is an adjustable sample pressure reducerfor sample pressures above 34.5 barg (500 psig) according to the Annual Book of ASTM Standards, ASTM Designation D3370. A precisely machined tapered rod assembly moves inside precision holes within the barrel of the VREL®. Pressure drop is a function of the length of the rods inserted into the barrel.

• Shuts down high temperature sample in less than 5 seconds.
• Need to reset by push button after sample is cooling down
• Protect operators, analyzers and sampling components from high temperature liquids with a Sentry Thermal Shutoff Valve. The sensor/actuator is directly exposed to the sample, providing quick reaction time. Economical and highly reliable replacement for solenoid shutoff valve and temperature controller.
• Suitable for system pressures up to 4400 psi (303 bar)
• Totally mechanical design requires no electricity, air, or hydraulics
• Optional dry contact for remote indication
• Standard trip temperature is 120ºF (49ºC) with other temperatures available
• 316 Stainless Steel construction

• Thermal Shutoff Valve (automatic)
• ThermOmegaTech
• Protects expensive and delicate sample analyzers
• Automatically resets when sample cools
• No outside power required
• Superior value vs. more expensive electric valves

Design Features

• Self-operating thermal actuator controls flow based on fluid temperature
• Operating temperatures unaffected by variable inlet pressures
• Wide choice of setpoints available
• Ram-type plug provides tight shutoff
• Corrosion resistant: all stainless steel construction

Typical Applications

• Excessively hot samples can cause damage to expensive and sensitive hardware and electronics. For process analyzers and similar instrumentation, it is important to assure that the process samples fluids are always below the maximum allowable temperature for such instruments. Sample coolers are commonly used to reduce sample temperatures to the acceptable limits. In the event of a loss of cooling fluid to the sample cooler, or if the desired sample temperature is exceeded for any reason, the HST valve will close to prevent equipment damage. HST valves are covered with our standard 36 month prorated warranty.

• Minimize "dead volume" assuring representative samples
• Three models* (RC-100, RC-200 and RC-400) meet your specific requirements, withstanding the demands of power plants
• Column(s) provide optimum fluid velocity with increased resin efficiency
• Color-changing resin gives quick visual indication of resin depletion level
• Twist-off cap for easy resin refill with available pre-sized Sentry resin refill packets 
• No PVC; wetted materials will not leach chlorides or plasticizers

• EPRI Isokinetic Sampling Nozzles (Probes)
• ASME PTC 19.11 The specification requires a "isokinetic sample nozzle" for representative sampling of the specific two-phase saturated steam flow via sample ports drilled in the side of the nozzle facing the steam flow.
• Recommended for saturated steam in steam boiler and power plants, for superheated steam (only if particulates are measured), isokinetic sampling is normally not required for water samples.
• These nozzles meet also the requirements of ASTM Standards D1066 and D3370.
• The nozzles extract a representative isokinetic sample from a flow region removed from the pipe surface and at the average flow velocity of the sample fluid.      
• This arrangement results in the withdrawal of the sample with representative concentrations of dissolved, suspended, and volatile constituents.
• An appropriate nozzle (probe) is designed for the desired sample flow and typical conditions of the sample fluid.  When the flow velocity through the pipe changes, sample flow should be adjusted to maintain isokinetic sampling.
• Each Nozzle (probe) is designed with considerations of vortex shedding, resonance, vibration, erosion, and strength of the attachment to the pipe.