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Primary Mechanical Shoe Seal (MS6)

Primary Mechanical Shoe Seal (MS6)

The Primary Mechanical Shoe Seal (MS6) has been used on different tanks types, containing the full range of Crude and Refined products. The seal is suitable for welded and riveted tanks with wide variations in rim spaces. All mechanical seal components are easily accessible allowing installation with the tank remaining “in-service”. No welding or flame cutting is required to install or maintain the shoes. All components are pinned or bolted with corrosion resistant fasteners.

Metallic shoes can be furnished in galvanized or stainless steel. Shoe height is selected to match the rim configuration, minimize extension below the floating roof and to ensure compliance with environmental codes. Metallic shoes are suspended in the rim space by bolt-on pantograph hanger assemblies. This flexible pantograph mechanism ensures that metallic shoes are held in constant contact with the tank shell despite rim gap variations.

For other designs, please head to our Floating Roof Storage Tank Seals page where you can find a range of internal and external tank seals.

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Material Specification:

Continuous Seal:

Teflon (Fiberglass) / Calcium Silicate / Urethane / Polyurethane

Sealing Ring:

Galvanized / Stainless Steel

Service life:

10-25 years

Typical Weight:

20 kg per linear meter

Technical data:

Rim space:

Normally 200 mm. ± 100 mm. is the standard but the seal design can be modified to suit larger nominal rim space

Aromatic resistance:


Recommended Vapour Membrane:

Calcium Silicate : 1.9 mm thick. It complies with DIN 22118, DIN 22100 (Part 1) and the Health and Safety Committee Guide of Shell. Meets the LASTFIRE 6.1 specifications. 85% compatible with aromatic products.

PTFE (Teflon): 0.25 and 0.35 mm thick. That comply with DIN 22118 and DIN 22100 (Part 1). Meets the LASTFIRE 6.1 specifications. 100% compatible with aromatic products.

Polyurethane (PU): from 0.4mm to 1 mm thick. 70-100% compatible with aromatic products

Alternative designs and specifications for the Secondary Primary Mechanical Shoe Seal (MS6) are available on request

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