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Primary Pantograph Tank Seal (PT1)

Primary Pantograph Tank Seal (PT1)

The Pantograph Primary Seal PT1 is the most widely used seal on Floating Roof Tanks and has been used on large tanks storing virtually all Crude and Refined products. This tank Seal ring is designed with flexures built into the sheets at intervals of approximately 550 mm to ensure conformity with the tank shell and allow expansion and contraction.

The weighted pantograph system ensures that the sealing ring is held in constant contact with the tank shell. The sealing ring extends into the product to ensure vapor retention and above the rim to ensure rainwater drains on to the Pontoon with the space between the sealing ring and the roof is closed by a vapor-tight flexible continuous seal material. Shunts are used at intervals of 3 meters or less to maintain electrical continuity between the roof and the tank shell.

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:

10-20 years

Typical Weight:

45 kg per linear meter

Technical data:

Rim space:

Normally 200 mm. ± 120 mm. is the standard but the seal design can be modified to suit larger nominal rim space.

Aromatic resistance:


Alternative designs and specifications for the Primary Pantograph Tank Seal (PT1) are available on request

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