Primary Seal – Scissor Type

Variations

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.

Guarantee

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-scissor-type transparent 100 #041e42 ‌ Key Benefits Design Features Request For Quote Talk To Tank Expert Key Benefits Designed to be installed as a bolted-in-place seal system. No welding or hang-in-place in the rim plate is required. The shoe seal can be installed while the tank remains in service. No need for hot work. The design uses THREE-HANGER per shoe system. This eliminates gap problems which is common on seal systems with multiple hangers per shoe. Custom shoes from 16" to 48" wide based on the rim height. Emissions are regulated by shoe extension below the liquid. The MSS-P-SCR1 mini shoe is adaptable to aluminum and 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. Tensioners 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. The hanger maintains a constant shoe elevation. This eliminates gaps caused by uneven elevation in various rim-space widths. Expansion joints at each shoe provide superior seal gap control during expansion and contraction while roof is in motion. The MSS-P-SCR1 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 tensioning and hanger system to maintain seal compliance throughout the seal life. Design criteria: The MSS-P-SCR1 forms a tight fitting seal between the floating roof and tank shell wall the seal meets the radial variations of ± 5 inches. The design eliminates shoe top roll back and gaping. The primary seal operates independently and without interfering with the secondary seal. The seal has been designed to accommodate roof movement, shell defects, con traction, and expansion.

Key Benefits

Designed to be installed as a bolted-in-place seal system. No welding or hang-in-place in the rim plate is required.
The shoe seal can be installed while the tank remains in service. No need for hot work.
The design uses THREE-HANGER per shoe system. This eliminates gap problems which is common on seal systems with multiple hangers per shoe.
Custom shoes from 16" to 48" wide based on the rim height. Emissions are regulated by shoe extension below the liquid.
The MSS-P-SCR1 mini shoe is adaptable to aluminum and 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.
Tensioners 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.
The hanger maintains a constant shoe elevation. This eliminates gaps caused by uneven elevation in various rim-space widths.
Expansion joints at each shoe provide superior seal gap control during expansion and contraction while roof is in motion.
The MSS-P-SCR1 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 tensioning and hanger system to maintain seal compliance throughout the seal life. Design criteria:

The MSS-P-SCR1 forms a tight fitting seal between the floating roof and tank shell wall the seal meets the radial variations of ± 5 inches.
The design eliminates shoe top roll back and gaping.
The primary seal operates independently and without interfering with the secondary seal.
The seal has been designed to accommodate roof movement, shell defects, con traction, and expansion.