Dryer Cylinders


More than 400 drying cylinders supplied to the Latin American market.


With more than 30 years of experience in the manufacture of dryer cylinders, we are today one of the major suppliers in Latin America and worldwide.

We produce Carbon Steel Drying Cylinders for small to large paper machines through a modern and rigorous process within the highest quality standards requirements, with ASME Certification and CE mark.




The many advantages of the carbon steel construction


Drying Gain

The main carbon steel property is ductility and this allows the reduction of the shell thickness of the dryer cylinder resulting in higher rates for heating transfer from the steam to the paper web.

Real-life case:
Six of the 49 old Cast Iron Drying Cylinders have been replaced by our Carbon Steel Drying Cylinders


The Drying Cylinders supplied by Hergen feature a smaller difference between the saturated steam temperature and cylinder surface temperature when compared to the cast iron cylinders.


Increase useful width

Due to the compact construction of the steel dryer cylinders, it increases its useful width eliminating wet edge problems during paper drying.


Increase safety

ZERO risk of explosion due to construction in carbon steel.


Reduce maintenance

Excellent welding process applied for steel plates eliminating possible leakages.


Cylinder Features

Turbulence bars

Destroy the condensate film created on the inner surface thus enabling higher heat transfer through convection between steam and the inner cylinder surface.

Benefits

Increases cylinder drying capacity

Improves drying / moisture cross profile

Increases evaporation rate for cylinders already running at their evaporation limit

Low cost investment


Oil lubricated bearings

Increased roller bearing lifespan.

Reduced maintenance

Excellent cost efficiency


Rotary Joint with flanged assembly.

This allows precise alignment of the rotary joint with dryer cylinder journal reducing seal ring wear

Benefits

Increases seal ring useful life

Reduces maintenance


Thermal insulation

Dryer cylinder loses heat through its heads which means a continuous energy waste. Cylinder thermal insulation minimizes this loss resulting in considerable energy savings.

Benefits

Steam saving from 3 to 5%

Increases operator safety

Low cost investment



Quality control

Quality certificate for all steel plates used in the manufacturing – mechanical and chemical properties-.

Quality certificate for cast elements – mechanical and chemical properties and metallographic structure.

Cylinder construction in compliance with strict manufacturing standards (ASME, PED or others, as required).

Ultrasonic inspection for every shell and cover plate.

Dimensional inspection after shell manufacturing.

Ultrasonic inspection for all welding seams.

Thermal treatment for stress relief.

Hydrostatic test in compliance with ASME and PED standards.

Dynamic balancing as per ISO 1940 class G 2.5 Standard.

Thorough dimensional control in all stages of cylinder manufacturing.



Productive capacity

Model Diameter (mm) Maximum face (mm) Operating pressure (bar) Regulation
SSD 1000 1000 10.300 10 ASME ou PED
SSD 1200 1200 10.300 10 ASME ou PED
SSD 1300 1300 10.300 10 ASME ou PED
SSD 1500 1500 10.300 10 ASME ou PED
SSD 1800 1828 10.300 10 ASME ou PED
SSD 2000 2000 10.300 10 ASME ou PED
SSD 2200 2200 10.300 14 ASME ou PED
SSD 2438 2438 10.300 14 ASME ou PED