Water Tube Boiler- ERK-HP

The SCHNEIDER ERK-HP is a natural circulation boiler in corner tube boiler design and is manufactured as a steam and hot water generator. With both boiler types, the tubular body is constructed in the same way – namely from prefabricated tubular elements containing combustion chambers and contact heating surfaces. This structure makes it fundamentally different from the conventional water tube boiler with natural circulation. This is because it has been built as a multi-drum boiler with heated downpipes for over 100 years

water tube boiler - ERK
Benefits of the ERK-HP

  • Use of various fuels
  • Extremely high load change speeds with stable water level
  • Compact design and self-supporting boiler construction
  • Generation of completely dry steam
  • Ideal adaptability to the spatial possibilities of the floor plan
Functional Principle of the ERK-HP

The pressure hull consists of a rectangular, stable framework consisting of downpipes, collectors and distributors, which are welded to flue gas tight pipe walls to form a closed pipe cage.


1. Steam drum – unheated
2. Downpipe – unheated
3. Floor pipes – heated
4. Upper collector – unheated
5. Overflow pipe – unheated
6. Return pipe – unheated
7. Riser pipe – heated
8. Mixture pipe – unheated
9. Partition wall
10. Steam extraction
11. Lower collector – unheated

Special Water Circulation System

The SCHNEIDER-ERK water circulation system has many special properties that differ significantly from those of other natural circulation boilers, especially the two-drum boiler. With the SCHNEIDER-ERK, only the riser pipes (7) and the floor pipes (3) are heated, while the steam drum (1), the downpipes (2), the overflow pipes (5), the return pipes (6), the mixture pipes (8), and all collectors are unheated. The steam-water mixture, which is generated in the riser pipes (7) and floor pipes (3), rises into the unheated upper collector (4). Here, there is almost complete steam–water separation (gravity principle). The separated steam flows through the overflow pipes (5) into the steam drum in the area downstream of the partition wall above the lowest water level. About 50% of the separated water flows through the unheated return pipes (6) in the direction of the floor pipes (3), while the remaining amount of water flows into the steam drum downstream of the partition wall below the lowest water level (LWL) via the mixture pipes (8). From here, the circulating water then falls through the unheated downpipes (2) into the lower collector (11) from where it is then distributed again into the heated boiler parts (3) and (7) – and the cycle begins again.

Areas of Application

  • Food industry
  • Oleochemical industry
  • Pharmaceutical industry
  • Oil and gas industry
  • Energy supply
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