Masoneilan 84003 Series SteamForm Installation Guide | 3
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Temperature Sensor Recommendations
Baker Hughes recommends a minimum of three (3)
temperature sensors to be mounted at the downstream
of the desuperheater. The sensors should be installed
at 120 degree angle, with 2 out of 3 voting failure, and
average logic.
The temperature sensor must be located at a point far
enough downstream to ensure 100% vaporization of the
water droplets. For control stability, single-phase steam
flow must be achieved. If high-energy water droplets
exist within the steam flow, the temperature element
recognizes sub-saturated conditions and reduces the
capacity of water injection. This misplacement of the
temperature element results in uncontrollable operation
requiring re-engineering to correct the errors of the
improperly designed steam conditioning system.
The proper location of the temperature sensor is
application specific. Benefits from a properly designed
downstream pipe system allow for a greatly reduced
distance. Flow induced benefits are achieved with the
proper placement of pipe elbows that allow high-energy
turbulence to assist in the mixing of spray water upon
passage through the elbow. For the sensor location
of a specific application, a piping layout along with
operating conditions must be provided to your local Baker
Hughes representative. However, the general direction
for minimum distance required for temperature sensor
location is per the equation below, and shown in Figure 3.
Temperature sensor distance, L3 = Minimum 33 ft
(10m)
Figure 2: Typical downstream piping installation
