Primary Seal – Pantograph Type


Several variations on this basic seal type exist including one to service riveted tanks.

Wax Scraper Plates

These can be provided to deal with waxy crude deposits on tank shells.

Regulatory Compliance

ATECO Tank Engineering seals meet or exceed the allowable gap requirements set forth by the governmental and regulatory agencies throughout the universe. This design will show superior sealing ability throughout the roof travel; accounting for roof shifting, out of roundness, buckling, and the expansion and contraction requirement of each tank.


ATECO TANK warrants its seals to be free from defects in the material and workmanship for a period of two year. Our liability under any express or implied warranty is limited to the purchaser price of any part found defective. Any seal systems installed by ATECO TANK TECHNOLOGY ENGINEERING SERVICE will have an additional two-year warranty.

Primary Seal Table

Key Benefits

1. Designed to be installed as bolted or welded in seal system.
2. The shoe seal can be installed while the tank remains in service. In bolted system no need for hot works.
3. The design uses THREE-HANGER per shoe system. This eliminates gap problems which is common on seal systems with multiple hangers per shoe.
4. Custom shoes from 16" to 48" wide based on the rim height. Emissions are regulated by shoe extension below the liquid.
5. The MSS-P-PTG1 mini shoe is adaptable to steel internal-floating roofs. The mini shoes are designed to fit on pan-floating roofs with 15" or less of rim space. Custom shoe widths from 16" to 24" to meet the weight requirements of shallow steel roofs.
6. Hangers are applied to the top and bottom of the shoe. This keeps the entire width of the shoe in contact with the tank shell. This is important with wax scraper designs.
7. The hanger maintains a constant shoe elevation. This eliminates gaps caused by uneven elevation in various rim-space widths.
8. Expansion joints at each shoe provide superior seal gap control during expansion and contraction while roof is in motion.
9. The MSS-P-PTG1 primary shoe seal is designed for flexibility in installation with egg-shaped tanks.

Design Features

ATECO Tank Engineering primary shoe seal has been designed with a long lasting pantograph hanger system to maintain seal compliance throughout the seal life.
Design criteria:
1. The MSS-P-PTG1 forms a tight fitting seal between the floating roof and tank shell wall the seal meets the radial variations of ± 5 inches.
2. The design eliminates shoe top roll back and gaping.
3. The primary seal operates independently and without interfering with the secondary seal.
4. The seal has been designed to accommodate roof movement, shell defects, con traction, and expansion.

Ateco Tank Leaflet
Ateco Tank Sample Project
Ateco Tank Metarial Specification
Ateco Tank Summary Specification
Ateco Tank Typical Drawings
Ateco Tank General Specification