Pewag Winner Fire Chains for Hot Galvanizing Plants
The solution for hot galvanising plants
The stress corrosion cracking is the most important issue for safe lifting in the hot-dip galvanizing and we have had it under control for 25 years!
With our lifting systems you create safety for your employees, protect your factory equipment and guarantee the continuous galvanizing process.
So what's different?
Lifting chains for hot dip galvanizing plants have to withstand extremely arduous working conditions and as a result require a very special type of product to cope with the rigours of such an environment.
On one side there are the high working temperatures which can reach up to 475ºC. Then there is the operation within the zinc bath which constantly removes material from the chain. On top of this there is an acidic bath which is used to clean the goods prior to plating, and it is this process that produces hydrogen which is dangerous to high strength alloy material and can result in hydrogen embrittlement.
Standard chain slings in grade 8, 10 or 12 cannot be used in these galvanizing processes due to the high temperatures involved, which permanently reduces the working load limit of the product (the maximum working temperature being approx 380ºC for pewag Winner 400 G10 chains). As mentioned above, the acidic bath also produces hydrogen that can result in hydrogen induced stress crack corrosion in these grades of chain, hence the need for a special product to overcome these deficiencies.
Looking for a solution to overcome the above mentioned issues, pewag developed a heat treatment process for alloy material which would help avoid these problems. They manufactured chains (slings) that had a working load limit higher than was normally available at the time, and which were not effected by hydrogen damage. These chains had working loads equivalent to grade 3 (roughly mild steel) at 475ºC and it was for these chain assemblies that pewag received the approval from the German testing and approval body. When the European standard EN 818-3 was released in 2000 the DGB withdrew that approval and gave a new approval for chains according to EN 818 part 3 and part 5, and it is this standard that now covers chains for hot galvanizing plants. Following this standard the new chains now have a working load limit at 475ºC, basically loaded as grade 4. But as required in part 6 of EN818 (details of safe use and maintenance) the WLL must be reduced by 50% when working at 475ºC, and the chains are tagged accordingly with a WLL based at this temperature.
- All our quality class 4 products are approved for use in hot-dip galvanizing plants and manufactured in accordance with the European Machinery Directive.
- All hangers are supplied with a test certificate and a load capacity tag, without this a sling chain must not be operated.
- All components are marked with the manufacturer's mark, quality class and traceability code and are supplied with operating instructions.
Possibilities of combination
The pewag winner fire product line can be adapted individually to your needs and offers many combination options:
Working load limits
The provided working load limits are the maximal values of the different chain sling types according to the reference method. The reduction due to use in a hot zinc bath has already been taken into account in this load capacity table.
pewag winner individual parts
In addition to our chain slings, that can be assembled individually according to your requirements, we also present individual parts here, which can provide very useful services. We also design and manufacture components according to your specifications.
Our shackle, especially for hot dip galvanizing, multiple use and safe.
Shackle for lifting and transporting loads in hot dip galvanizing shops. The SCHWF shackle is connected with suitable components such as KWF chains, transition links and hanger rings to form slings.
SCHWF shackles available from 1.325 to 8 t.
"Just" an S-hook, but with everything needed for lifting loads in terms of markings and documentation.
SMWF 500 kg to 3,150 kg, or what you need for your production.
Our speciality for zinc addition
These hanger variants (KWF/HT) are specially designed for adding fresh zinc. A task that every galvanizer knows from daily practice.