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GREENDECK - Floating Roof Rim Seals

Custom-designed GREENDECK Floating Roof Rim Seals are tailored for each specific tank, adhering to the standards of API 650/653, BS 2654, EN-14.015, and EEMUA-159. Leveraging over two decades of expertise, Maxwell Continental Tank Serv Engineering has seamlessly integrated past experiences into their research and development, resulting in increasingly innovative products aimed at minimizing emissions from above ground storage tanks (ASTs). The company's commitment extends beyond novelty, as they also specialize in revitalizing or adapting older technologies and products to enhance efficiency when necessary.

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Features:

  • Equipped with a rim seal system.

  • Rim seal system is attached to the roof perimeter and contacts the tank wall.

  • System slides against the tank wall during roof movement.

  • Floating deck includes fittings for operational functions.

"GREENDECK" Floating Roof Rim Seals:

  • Prevents vapor losses and ingress of rainwater.

  • Tailored for various types of above ground storage tanks (ASTs).

  • Designed to satisfy all protection needs.

Prevention of Damages and Movements:

  • Prevents horizontal movements that may damage tank features.

  • Designed to positively center the floating roof.

  • Dampens horizontal roof movements to a minimum.

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Secondary Rim Seal Features:

  • Exposed material designed to meet or exceed fire-retardant level requirements.

  • Secondary rim designed as low as possible for increased filling capacity.

GREENDECK's Expertise:

  • Backed by years of experience in design, manufacturing, and installation.

  • Provides comprehensive solutions for rim seal requirements.

  • Ensures products satisfy all protection needs.

Design Limits Evaporative Losses:

  • Evaporative losses limited to rim seal system, deck fittings, and exposed liquid on tank walls.

  • Standing storage loss and withdrawal loss are considered.

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Critical Criteria for Effective Rim Seal:

  • Compliance with basic criteria for cost-effectiveness.

  • Parts designed to be product-resistant due to contact.

  • UV-resistant materials used for parts exposed to sunlight.

  • Wear-resistant materials for parts involved in sliding movements.

Adaptability to Working Range:

  • Analyses and evaluates the working range based on Maxwell design input.

  • Complies with API requirements (e.g., +/- 4" or 102-mm) or other local laws and guidelines.

  • Adaptable to different working ranges (e.g., EEMUA 159, NEN-EN 14015).

TYPES OF MECHANICAL SEAL SYSTEM FOR IFR

PANTOGRAPH TYPE MECHANICAL SEAL

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General:

The 'GREENDECK-1 PT Pantograph Type Mechanical Seal' system is widely adopted for floating roof tanks, covering a broad range from 10 m to 100 m in diameter and accommodating storage of both crude oil and refined oil products.

The pantograph system with weight ensures continuous contact between the Shoe Plate and the tank shell.

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Technical Data:

Rim space: 200±100mm

Aromatic Service: 100%

Typical service life: 18-20 years

Weight of Seal Assembly: 43.2kg/m

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Material Specification:

Continuous Seal:

A. (N.B.R/P.V.C Sheet with Polyester scrim), 2.4mm thickness

B. (Poly-Urethane Sheet with Polyester scrim), 1.0mm thickness

Shoe Plate: Stainless Steel (304), 1.2t / Galvanized Steel, 1.6t

Pantograph Unit: Carbon Steel with Hot-Dip Galvanized / Stainless Steel (304)

Counter Weight: Carbon Steel / As per Order

SPRING TYPE MECHANICAL SEAL

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General:

The 'GREENDECK-1ST/2ST Spring Type Mechanical Seal' system stands out as a highly effective solution, striking a balance between cost and sealing ability. It has proven successful on tanks ranging from 10m to 100m in diameter.

The powerful stainless steel Pusher Spring ensures continuous contact between the Shoe Plate and the tank shell, contributing to the seal's effectiveness in reducing vapor loss with top-quality materials.

 

Technical Data:

Rim space: 200+100mm

Aromatic Service: 100%

Typical service life: 10-12 years

Weight of Seal Assembly: 15.4kg/m and  8.7kg/m

 

Material Specification:

Continuous Seal:

A. (Poly-Urethane Sheet with Polyester scrim), 1.0mm thickness

B. (N.B.R/P.V.C Sheet with Polyester scrim), 2.4mm thickness

Shoe Plate: Stainless Steel (304), 1.2t / Galvanized Steel, 1.6t

Pusher Spring: Stainless Steel (301), 1.0t

Arm, Channel Arm: Stainless Steel (304), 1.5t / Galvanized Steel, 1.6t

Hanger Bracket: Stainless Steel (304), 2.0t / Galvanized Steel, 2.0t

FOAM SEAL

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General:

The 'GREENDECK-FOAM Foam Seal' system has gained recognition and preference from customers globally for its exceptional performance. It has been successfully utilized on tanks ranging from 10m to 98m in diameter.

The efficient design features an octagonal foam block covered with an envelope, ensuring continuous contact with the tank shell. The foam section is securely fixed in position by a hold-down plate.

The determination of the seal mounting position, whether liquid-mounted or vapor-mounted, is contingent upon the presence of the Seal mounting plate.

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Technical Data:

Rim space: 200+100mm

Aromatic Service: 100%

Typical service life: 10-12 years

Weight of Seal Assembly: 8 to 9kg/m

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Material Specification:

Foam Block: K-THANE (Poly-Urethane Foam)

Envelope:

(Poly-Urethane Sheet with Polyester scrim), 1.0mm thickness

(N.B.R/P.V.C Sheet with Polyester scrim), 1.6mm thickness

(Teflon Sheet with Polyester scrim), 0.25mm thickness

Seal Mounting Plate, Hold Down Plate: Stainless Steel (304), 2.0t / Galvanized Steel, 2.0t

TUBE LIQUID FILLED SEAL

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General:

The 'GREENDECK- 1TLF, TUBE Liquid Filled Tube Seal' system is meticulously designed as a liquid-mounted seal, filled with liquid, typically kerosene or gas oil. It is specifically tailored for use on tanks containing the full spectrum of crude oil and refined petroleum products.

The liquid-filled tube exerts pressure on the scuff band, ensuring efficient contact with the tank shell.

The scuff band is engineered with a ribbed surface to withstand contact with the rough tank shell.

 

Technical Data:

Rim space: 200+100mm

Aromatic Service: 100%

Typical service life: 8-10 years

Weight of Seal Assembly: 19kg/m

 

Material Specification:

Tube: (N.B.R/P.V.C Sheet with Polyester scrim), 1.6mm thickness

Scuff Band: Ribbed Surface, (N.B.R/P.V.C Sheet with Polyester scrim), 5.0mm thickness

Clamp Bar: Carbon Steel with Hot-Dip Galvanized, 4.5mm thickness

SECONDARY SEAL

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General:

•The 'GREEDECK-1SS Seal' system functions as a secondary seal, showcasing excellent sealing capabilities, particularly with its vertical 'Seal Blade.'

•Comprising compression plates with a seal blade and curtain seal (vapor barrier), this seal ensures consistent contact between the seal blade and tank shell due to the tension pressure of the compression plate.

•The GREENDECK-20 system is versatile, compatible with any type of primary seal, making it suitable for tanks containing various crude oils and refined products.

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Technical Data:

•Rim space: 200±100mm

•Aromatic Service: 100%

•Typical service life:

•Stainless Steel (304): 10-12 years

•Galvanized Steel: 6-10 years

•Weight of Seal Assembly: 10.74kg/m

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Material Specification:

•Seal Blade: Synthetic Rubber

•Curtain Seal: N.B.R/P.V.C Sheet with Polyester scrim, 1.0mm thickness

•Shunt (earth): Stainless Steel (301), 1.0t

•Compression Plate, Clamp Bar: Stainless Steel (304), 1.5t / Galvanized Steel, 1.6t

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