
BLOG
TwiNozzle White Paper: Performance improvement for desuperheater systems

Written By IMI Publications
April 5, 2023
The TwiNozzle multi-spindle product line is a new series of nozzles designed to either improve the performance of desuperheaters or reduce the cost (CAPEX) of desuperheater systems.
They consist of a single retainer (the nozzle holder) which holds two spring loaded nozzles which are arranged in such a way that both nozzles spray against the steam flow (see figure 1). This is to ensure a wider spray pattern and enhanced spray performance compared to standard nozzles. The TwiNozzle multi-spindle design is patented under PAT. No. US 2014/0252125.
Secondary breakup (water fractionation induced by the drag force exerted by the steam on the droplet) is the most effective way of achieving high levels of water droplet fractionation. IMI CCI has been a leader for years in maximisation of secondary breakup capabilities of our desuperheaters. Extensive research in the physics of evaporation has led to the development of the TwiNozzle. This innovation can improve spray plume distribution (see Figure 3) and secondary breakup at the same time, reducing evaporation distances by more than 25%.

IMI's TwiNozzle technology
Sizes and material
The TwiNozzle comes in 3 sizes and is compatible with IMI CCI standard nozzle studs. Furthermore, there are also two high-capacity versions available dedicated to turbine bypass applications where a lower number of nozzles, holders, studs and welded pipe branches can significantly reduce the overall cost of the desuperheater. All springs used are made from Ni Alloy 718, spring tempered and hot relaxed to ensure optimal performance in the harshest environments. Once again, IMI has shown that the quality of its engineering, materials and application expertise, make it the right partner for critical valves.
Sizing and selection
The complex TwiNozzle multi-spindle design can be sized and selected by use of IMI’s EDME-Tool. This tool allows the creation of an optimised flow profile inside the desuperheater which is very often required in challenging application requirements. All existing desuperheaters can be upgraded with the TwiNozzle spray solution and this product can also be used as a cost-effective alternative to probe style desuperheaters.Reach out to your IMI sales representative, application engineer or Valve Doctor® to talk about your desuperheater system and how our TwiNozzle solution can enhance it.
Download below for full white paper.
Don’t want to miss anything?
Get the latest news, expert insights, and case studies delivered straight to your inbox. Subscribe now and never miss an update.

Don’t want to miss anything?
Get the latest news, expert insights, and case studies delivered straight to your inbox. Subscribe now and never miss an update.


Don’t want to miss anything?
Get the latest news, expert insights, and case studies delivered straight to your inbox. Subscribe now and never miss an update.
Engineering the future together
Looking for the perfect flow control solution? Our experts specialise in providing tailored solutions to meet your unique needs. Let us help you achieve optimal performance, efficiency and safety.