Chemical applications
Special applications with aggressive acids and alkalis, curing or crystallizing products require precise material selection and proven constructions.
ProPack AG products have been specifically designed to meet the special requirements of customers in the chemical industry:
- for controlled leakage and extrusion resistance
- at high pressures and shaft speeds
- corrosion resistant
- reduced process contamination
- easy handling and thus fast maintenance times
Packing types
Products customized for applications in the chemical industry.
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Valve Packing
A 37 GraphoFlon
No slip stick effect; High cross section density; High temperature resistant to minimize emissions; Non hardening, good reset capability; Coefficient of thermal expansion similar to steel; Easy to cut, install and disassemble; Low coefficient of friction minimizes the adjustment force in valves; Recommended as die formed rings; For valve applications rings should be approx. 25 - 30% compressed at installation
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Special packing
S 6 Öko
Highest chemical resistance for a packing in rotating equipment; Pliable, easily compressible packing; Self lubricating, dry running capability; Shaft protecting surface hardness of HRC 25 is sufficient; Non ageing
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Special packing
S 6 SI
Highest chemical resistance for a packing in rotating equipment; Pliable, easily compressible packing; Self lubricating, dry running capability; Shaft protecting surface hardness of HRC 25 is sufficient; Non ageing
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Trapez Pack
Trapez-Pack®1
Excellent heat conductivity; Maximum protection of shaft against wear (HRC 25 is sufficient); Extended MTBF; Easy and safe installation and handling; No ageing process
Case studies Chemical industry
Sealing applications in practice
In a chemical factory, a water/steam mixture was sealed in a dryer. The speed of the 834 mm shaft was very low at 6 rpm. The pressure, on the other hand, was very high at 15 bar and 250 °C temperature. 8 rings of a 25 mm packing were used. The previous packing lasted 6 months. Repacking was a costly affair due to the cooling process of the line and also involved product loss in addition to the downtime costs. The TP55 was chosen as an improvement. It lasted 24 months so far.
Trapez-Pack®55
with carbon fiber corner reinforcement
In a chemical factory, PTFE/graphite packing was previously used to seal gypsum slurry with phosphoric acid at ambient temperature. The pump had a 65 mm shaft with a speed of 1450 and delivered 4 bar. 5 rings of a 16mm packing were installed. The service life so far was 1 week. The packing hardened badly and sometimes damaged the protective sleeve very badly. A TP30 was chosen as a replacement. It was much easier to break in. The desired drip rate was achieved quickly and remained constant for much longer. The service life extension was over 4 times that of the previous packing.
Trapez-Pack®30
High purity carbon fiber