The Copes-Vulcan model Multiple Nozzle Spray Desuperheater (MNSD) offers optimum performance and rangeability in a variable spray tube design.
The MNSD fills the performance gap between the limited capability of a simple mechanical spray type desuperheater and the virtually unlimited capability of Copes-Vulcan’s Variable Orifice Desuperheater.
The MNSD offers high temperature capabilities and up to Class V leakage rating.
The Copes-Vulcan model VO-II offers extremely fine control and exceptional turndown that is limited only by the rangeability of the coolant control valve itself.
With excellent mixing of vapor and coolant, control is possible throughout the entire operating range to within 3± 5° F (± 2.5° C) of the set point which can be as close as 10° F (5° C) above saturation. The coolant pressure which is required at the inlet to the VO-II need only be 5 psi (35 kPa) above the pressure of the vapor being desuperheated.
Because virtually all the desuperheating occurs within the VO-II body itself, the temperature sensing element can be as close as 14’ to 20’ (4 -6m) from the desuperheater outlet.
Copes-Vulcan’s Variable Orifice Desuperheater (VO-76), while virtually identical to the model VO-II, is used when existing piping requires a custom fit; where pressure ratings exceed class 900; or where size requirements exceed those provided by the VO-II.
The VO-76 is also available with a housing fabricated from forged and wrought piping components when technical specifications and/or N.D.T. requirements preclude the use of castings. Again, reducers and flanges can be added as required, but unlike the cast VO-76, this applies to both inlet and outlet on the fabricated version of the VO-76.
By using various sized reducers/expanders and/or flanges, an almost endless variation of dimensions and end connections can be achieved.
The VAD is a cost effective, line size desuperheater, produced from stock materials and is readily available to satisfy general desuperheating and gas cooling applications.
Essentially a dynamically contoured, stainless steel spray head concentrically located within a short section of pipe (body). The pipe acts as the desuperheaters outer body and pressure boundary. It fits into the main vapor line via either line size flanged or butt weld end connections for easy installation.
Copes-Vulcan’s Spring Assisted Multiple Nozzle Desuperheater (SAMN-U) reduces steam or gas temperatures by introducing cooling liquids directly into the hot vapor.
The SAMN-U desuperheater has six nozzles which can be opened or closed to vary the coolant flow. This provides a higher turndown than single nozzle units where the amount of coolant flow is dependent only on the ability to vary the pressure drop across the nozzle.
The SAMN-U desuperheater contains an integral spring-loaded flow plug which moves in response to a change in pressure differential between the coolant inlet pressure and the main header pressure. As the plug moves, nozzles are uncovered introducing more-or-less coolant into the main header.
The Copes-Vulcan Steam Atomizing Desuperheater (SA-35) is used to reduce the temperature of vapors such as steam with condensate such as water. It was developed to obtain a more uniform spray under varying load conditions where no pressure drop in the steam header can be tolerated.
This SA-35 desuperheater is made in four sizes, in pressure classes up to and including Class 1500.
The Copes-Vulcan MA (MA-I/MA-IU; MA-II/IIU; & MA-III/IIIU) Mechanical Desuperheaters are generally used for attemporating applications featuring steady loads. Particularly designed for rugged service, MA desuperheaters can maintain final temperature to within 20°F (11°C) of saturation.
MA models are available in two mounting options. The MA-I, II, & III are designed for welding to the pipe line, and the MA-IU, IIU, & IIIU are flange mounted.
MA-IU, IIU, & IIIU desuperheaters also offer mounting commonality with other ‘U’-series desuperheaters (MNSD-V and SAMN-U).
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