Seals for marine applications
Shipbuilding requires careful attention to the quality of the materials used. During construction and operation, seals must be durable and reliable over a long period of time.
Safety is essential in this industry, so specialized products are required. Features such as chemical resistance to the corrosive marine environment, extreme pressure resistance, durability, fire protection, and more. ProPack products meet the high standards.
Packing types
Products customized for marine applications.
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Pump packing
P 8E Ramie
Universal packing for the lower temperature range; Excellent value for money; Shaft protecting, resistant to rotting; Recommended shaft surface hardness: HRC 45; Excellent in products containing solids
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Trapez Pack
Trapez-Pack®18 ProStar
Preferred packing for sealing abrasive mediums in pumps, mixers, agitators and other rotating equipment; Excellent when used in crystalizing products; Low Coefficient of friction and ultimate heat conductivity; High plant standardization possibilities. Recommended Shaft Surface Hardness HRC35
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Trapez Pack
Trapez-Pack®55 Grapho Carbo
Universal plant wide use in static and rotating applications; Wear and extrusion stability through carbon fiber corner reinforcement; Non hardening, good reset capability, coefficient of thermal expansion corresponds to the coefficient of steel; High temperature resistance and excellent heat and electric conductivity; Self lubricating, excellent use in pumps, minimizing the need of flushwater; Easy to cut, assemble and disassemble; Low coefficient of friction minimizes the adjustment force in valves; No shaft wear, excellent dry running characteristics; Rings should be compressed in valve applications at assembly approx. 15 - 20 % in height; Die formed rings are recommended
Case studies Shipbuilding
Sealing applications in practice
At a shipyard, pumps supplying the dry dock were sealed with 4 rings of 22 mm packing. Previously, expanded graphite packing was used. It tended to run hot and the product crystallized, damaging the shaft sleeve. The product was seawater with a pH value of 8 and ambient temperature. The pressure was 1 bar. The service life reached only 1 month. The customer was looking for a solution that lasts longer would not cause damage to the shaft sleeve. The TP18 was chosen. It lasted 4 months and tread was perfect.
Trapez-Pack®18
ePTFE/Graphite and Carbon/Graphite Yarn