Mechanical Shoe Seal (MSS)

Name: Mechanical Shoe Seal (MSS)
Brand: Vyapar Infotech
Rating: 5.0 (3539 reviews)

A Mechanical Shoe Seal (MSS) is a primary rim seal system installed around the perimeter of an External Floating Roof Tank (EFRT) and IFRT to minimize the annular vapour space between the floating roof and the tank shell. The seal consists of a series of overlapping metallic shoes held firmly against the tank shell by stainless steel springs or pantograph mechanisms. A reinforced elastomeric seal fabric connects the metallic shoes to the floating roof, forming a flexible vapour barrier that accommodates shell irregularities, roof movement, thermal expansion, and wind-induced deflection. The Mechanical Shoe Seal provides excellent vapour emission control, reduces product losses, improves fire safety, and maintains reliable sealing performance over the full operating range of the floating roof. It’s very easy for maintenance and disposal of compare to Foam seal.

Typical Application

• External Floating Roof Tanks (EFRT).
• Crude Oil Storage Tanks.
• Gasoline, Diesel, Naphtha, Kerosene, Jet Fuel (ATF), Ethanol and Petrochemical Storage Tanks.
• Low, Medium and High Vapor Pressure Hydrocarbon Storage.
• Refineries.
• Petrochemical Plants.
• Oil & Gas Production Facilities.
• Tank Farms and Bulk Liquid Storage Terminals.
• Marine Export Terminals.
• New tank construction and retrofit or seal replacement projects.

Guideline / Standard

Storage Tank Standards
• API 650 – Welded Tanks for Oil Storage (Appendix C – External Floating Roofs and rim seal systems).
• API 653 – Inspection, Repair, Alteration and Reconstruction of Storage Tanks.

Lightning & Static Protection
• API RP 545 Rev.1 – Lightning Protection of Aboveground Storage Tanks (bonding and insulation requirements for metallic shoes where applicable).
• API 2003 – Protection Against Ignitions Arising Out of Static, Lightning and Stray Currents.
• NFPA 780 – Standard for the Installation of Lightning Protection Systems.

Fire Protection
• NFPA 30 – Flammable and Combustible Liquids Code.
• NFPA 11 – Standard for Low-, Medium-, and High-Expansion Foam Systems (rim seal fire protection where applicable).

Environmental Standards
• EPA 40 CFR Part 60 – Subpart K, Ka and Kb – Standards of Performance for Storage Vessels (VOC emission control through rim seal systems).

International Standards
• EN 14015 – Specification for the Design and Manufacture of Site-built Vertical Cylindrical Steel Storage Tanks.
• EEMUA 159 – Aboveground Flat-bottomed Storage Tanks – Design, Construction, Inspection and Maintenance.

Indian Standards
• OISD-118 – Inspection and Maintenance of Aboveground Petroleum Storage Tanks.
• OISD-244 – Fire Protection Requirements for Petroleum Installations.
• Project specifications issued by BPCL, HPCL, IOCL, ONGC, ADNOC, Saudi Aramco, Shell, ExxonMobil, Chevron and other EPC/PMC organizations.

Material of Construction (MOC) : -

Mechanical Shoes: Stainless Steel SS304, SS316, or Pre-Galvanized Sheet (IS 277) depending on service conditions.

Spring Assembly: Stainless Steel SS304, SS316,

Seal Fabric (Envelope): Reinforced NBR, PU, TPU, FKM (Viton®), PTFE-coated Fiberglass, or composite elastomeric fabric compatible with stored products.

Wear Strips / Sliding Pads: UHMWPE, HDPE, Nylon.

Clamp Bars: Stainless Steel SS304 or SS316, Aluminium Alloy, or Pre-Galvanized Sheet (IS 277)

Fasteners: Stainless Steel SS304 or SS316 (A2-70/A4-80).

Insulation Kit (Optional): NYLON 66, FRP, PTFE, or UHMWPE insulating pads and sleeves for compliance with API RP 545 Rev.1.

High-Performance System

Our Liquid Mounted Primary Foam Seal provides reliable vapour sealing, reduces product loss, and enhances the safety and efficiency of floating roof storage tanks.