Detail
Built for High-Efficiency Sample Cooling
The VIRA NK 20 Sample Cooler is engineered to provide effective cooling of high-temperature boiler-water and steam samples before analysis. Its design combines a large cooling-water body with an extended internal sample coil to create a generous heat-transfer surface within a compact boiler-room solution.
Enhanced Heat-Transfer Surface
The enlarged body diameter provides a higher cooling-water volume around the coil. At the same time, the extended length of the sample tube increases the surface area available for heat exchange. Together, these design features support efficient heat transfer between the hot sample and the cooling water, helping reduce sample temperature before discharge.
Safe Sampling from Pressurised Boiler Systems
Drawing a sample directly from a pressurised boiler system can generate flash steam as the pressure drops. This creates a burn risk for personnel and may make the sample difficult to handle. NK 20 cools the sample before it reaches the outlet, supporting safer routine sampling in the boiler room.
Support Accurate TDS and Conductivity Analysis
Flash steam can change the concentration of the remaining liquid sample and lead to misleading conductivity or TDS results. By cooling the sample before collection, NK 20 helps users obtain a more representative liquid sample for boiler-water evaluation, water-treatment decisions and blowdown management.
Counter-Current Cooling Principle
The sample flows through the internal stainless-steel coil while cold mains water flows around the coil in the opposite direction. This counter-current flow arrangement maximizes the temperature difference across the heat-transfer surface and supports effective sample cooling.
Stainless-Steel Construction for Boiler Applications
The body and coil are manufactured from AISI 304L stainless steel. The coil is designed for a maximum operating pressure of 32 bar(g) at 239°C, while the cooling-water body is designed for a maximum operating pressure of 10 bar(g) at 100°C.
Simple Integration into Sampling Systems
NK 20 features 1/4" BSP threaded sample inlet and outlet connections and 1/2" BSP threaded cooling-water inlet and outlet connections. The optional NK 20-MS installation kit provides practical connection and valve components for a complete sampling arrangement.
A Reliable Part of Boiler Water Management
With no moving parts, a robust stainless-steel structure and an enhanced cooling design, NK 20 provides a compact and maintenance-free solution for regular boiler-water testing, automatic blowdown applications and water-treatment control programmes.
| Product | : | NK 20 |
| Coil | ||
| Max. Design Pres. | : | 32 Bar g @ 239 °C |
| Max. Desin Temp. | : | 239 °C @ 32 bar g |
| Max. Cold Hyd. test Pres | : | 48 Bar g |
| Body | ||
| Max. Design Pres. | : | 10 Bar g @ 100 °C |
| Max. Design Temp. | : | 100 °C @ 10 Bar g |
| Max. Cold Hyd. Test Pres. | : | 16 Bar g |
| Materials | ||
| Body | : | Stainless Steel (1.4307) |
| Coil | : | Stainless Steel (1.4307) |
| Connection | ||
| Sample ınlet | : | 1/4'' |
| Sample Outlet | : | 1/4'' |
| Cooling Water Inlet | : | 1/2'' |
| Cooling Water Outlet | : | 1/2'' |
