Design of Sampling Systems for Steam and Water
- Steam or water in the process pipe should be sampled isokinetically. This can be achieved using a Jonas Isokinetic
Sampling Nozzle.
- For steam sampling, the isolation valves on the Jonas Nozzle and the sample tubing between the
isolation valves and the primary sample cooler should have approximately the same bore as the Jonas Nozzle. This will
maintain a constant flow velocity and minimize the amount of deposition between the Nozzle and primary cooler by eliminating
dramatic pressure changes.
- The sample velocity in all tubing after the primary cooler should be in the turbulent
flow range (Re > 4,000, 4 to 6 ft/sec for liquid water) so that the amount of deposition in the sample tubing is minimized.
Also, the pressure drop throughout the entire sampling system must be low enough to ensure that there is enough pressure
after the secondary sample cooler to provide adequate flow to the online instruments and grab sample tap.
- Sample tubing
should be as short as possible, sloping downward along the entire length. For steam sampling, the tube section between the Sampling
Nozzle and the primary sample cooler should be less than 20 ft long.
Requirements for a Representative Sampling System
E2P Design of Sampling System
We will recommend any or all sampling system components, including the secondary sample cooler.
The Design Report includes: sample
tubing sizes and materials, valve sizes, and primary and secondary cooler materials and sizes. In addition, the pressure drop
through each section of the sampling system and the overall pressure drop are calculated to ensure adequate sample flow. The
entire system is designed based on industry recommended practices.
The proper design of a sampling system is critical in order to produce a sample which is representative of the conditions in the pipe.
If the sampling system is not adequate, the pressure drop through the system could result in insufficient sample flow at the
sample panel, or the deposition rate in the sample lines could be high, which could result in plugging of the sample line or a sample
which is not representative of the conditions in the pipe.
Energy &
Environmental Products
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Energy & Environmental Products LLC
624 S. Boston Ave.
Tulsa, OK 74119, USA
Phone: +1-918-957-8281
Exclusive Supplier of Jonas Isokinetic Sampling Nozzles
Specializing in Sampling of Steam, Water, and Industrial Gases
