Desuperheaters
 Variable Annulus Desuperheater (VAD)
The Copes-Vulcan VAD is a cost effective, line size desuperheater. The VAD is readily available.
Features:
Temperature control to within 5 °C (10 °F) of saturation
Horizontal or vertical installation
High rangeability 15:1
Coolant pressure need only be 0.5 bar (7 PSI) superior to vapor
Self-regulating 360 degrees coolant annulus for uniform distribution.
No spray nozzles to introduce blockage concerns
Full atomization over the entire operating range
Minimal vapor side pressure drop
No thermal liners required.
Butt weld or flanged to ANSI 150, 300, 600 or DIN PN10, 16, 40, 64, 100.
Body: Carbon, Chrome Moly, and Stainless Steel. Spray Head and Wetted Pants: Stainless Steel
 Variable Orifice Desuperheater (VO-II and VO-76)
VO-II
The Copes-Vulcan Variable Orifice Desuperheater is recognized as an industry leader.
It can easily meet the most demanding needs for desuperheating in both power and process industries. It offers extremely fine control and exceptional turndown that is limited only by the rangeability of the coolant control valve.
 VO-76
The Copes-Vulcan VO-76 is especially well suited for high pressure and temperature service (e.g. ANSI 1500 and above). It is particularly adaptable where custom fitting to new or existing piping is a problem. The VO-76 provides alternatives where limited space or changes in header diameter are factors.
Features:
The VO II offers extremely fine control and exceptional turndown that is limited only by the rangeability of the coolant control valve itself. Typically the unit can achieve a rangeability of 100:1 when matched with a Copes-Vulcan control valve fitted with Cascade trim design.
Due to excellent mixing of vapor and coolant, control is possible throughout the entire operating range to within 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 (0.35 bar) above the pressure of the vapor being desuperheated.
Since virtually all the desuperheating occurs within the body itself, usually no pipe liners or long downstream straight pipe runs are necessary.
  MA-I / MA-IU
The Copes-Vulcan MA-I/MA-IU Mechanical Desuperheater is generally used for attemporating applications featuring steady loads. It is particularly designed for rugged service and can maintain final temperature to within 20F (11C) of saturation.
Maximum cooling liquid capacity is 25,860 lbs/hr (11,700 kg/hr) at a nozzle differential pressure of 160 psi (1100 kPa) when using 100F (38C) water. Multiple units or other models can be installed in a header for higher capacities.
This model is available in two mounting options. The MA-I is designed for welding to the pipe line and the MA-IU is flange mounted. The MA-IU also offers mounting commonality with other U-series desuperheaters (MA-IIU, MNSD-V and SAMN-U).
  MA-II / MA-IIU
The Copes-Vulcan MA-II/MA-IIU is a mechanical atomizing desuperheater that is generally used for applications which feature steady loads. It is particularly designed for rugged service and can maintain final temperature to within 20°F (11°C) of saturation. In addition to steady load service, it is often used for attemporating applications, and performs equally well for both.
Maximum cooling liquid capacity is 175,000 lb/hr (80,000 kg/hr) at a nozzle differential pressure of 400 psi (2760 kPa) when using 100°F (38°C) water.
This model is available in two mounting options. The MA-II is designed for welding to the pipe line and the MA-IIU is flange mounted. The MA-IIU also offers mounting commonality with other U-series desuperheaters (MA-IU, MNSD-V and SAMN-U).
 MA-IIIU
The Copes-Vulcan MA-IIIU Mechanical Atomizing Desuperheaters reduce steam or gas temperatures by introducing cooling liquids directly into the hot vapor.
The MA-IIIU is a probe style direct contact heat exchanger and is mounted by a universal flanged connection. The liquid passes through the main tube of the desuperheater to the spray nozzles and discharges into the header.
The MA-IIIU is generally used for applications which feature steady and variable loads. The primary use is for interstage attemperation of high pressure and temperature superheated steam and is specially designed for intermittent use.
 Spring Assisted Multiple Nozzle Spray Desuperheater (SAMN-U)
The spring assisted multiple nozzle desuperheater reduces steam or gas temperatures by introducing cooling liquids directly into the hot vapor.
Copes-Vulcan's SAMN-U 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.
SAMN-U 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, more or less nozzles are uncovered introducing more or less coolant into the main header. The cooling water inlet pressure is controlled by a Copes-Vulcan Severe Duty or General Service Globe Valve.
Features:
Rangeability as high as 9:1
Temperature control to within 15°F (8°C) of saturation with the ability to hold set point within a tolerance of 10°F (6°C)
Standard maximum available Cv of 2.50 (Kv of 2.16); higher capacity available
Available in standard classes 150, 300, 600, 900, 1500 and 2500 per ANSI B16.5
Cooling water pressure minimum of 225 psi (1550 kPa) to a maximum of 1000 psi (6900 kPa) above the steam header pressure at the inlet
Mounting commonality with U-Series desuperheaters
 Steam Atomizing Desuperheater (SA-35)
The Copes-Vulcan SA-35 Steam Atomizing Desuperheater 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 desuperheater is made in four sizes, in pressure classes up to and including Class 1500.
Features:
High rangeability 25:1
Shorter mixing distances than mechanical atomizing desuperheaters
May be installed in either horizontal or vertical piping
Temperature control to within 15Ί F (8.3Ί C) of saturation with the ability to hold set point within tolerance of 10Ί F (5.6Ί C)
 Multiple Nozzle Spray Desuperheater (MNSD)
The Copes-Vulcan Multiple Nozzle Spray Desuperheater 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-Vulcans Variable Orifice Desuperheater. The MNSD offers high temperature capabilities and up to Class V leakage rating.
Features:
Temperature control to within 15°F (8°C) of saturation with the ability to hold set point within a tolerance of 10 °F (6°C)
Standard maximum available Cv of 10.5 (Kv of 8.9)
Water flow turndown of 150:1 or higher
User friendly design - nozzles and trim assembly can be removed without disconnecting the actuator
No need for separate cooling water control valve
Designed for applications with temperatures up to 1150°F (620 °C)
Available in standard classes 600, 900,1500 and 2500 per ANSI B16.5
Cooling water inlet pressures up to 3500 psig (24 MPag)(higher pressures on application)
FCI 70-2/ANSI Class IV or Class V shutoff capability
Suitable for vertical or horizontal installation
Standard ANSI connections are 3" (80mm) raised face flange (steam) and 1.5" (40mm) raised face flange (water)
Designed to resist thermal fatigue
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