External Floating Roof Seals - Primary Seals

Comparison Chart

HMT offers a multiple primary seal options for external floating roof tanks. Each seal is customized to fit to the tank to ensure non-gapping performance, long life and safe operation. External primary seals include a variety of configurations, component sizes and material options to handle any application and stored product. Shoe seals also include wax-scraper options.

Compare HMT’s External Floating Roof Primary Seals

Contact an HMT sales rep to discuss which one is right for your application.

External Floating Roof Seals - Primary Seals
	Liquid Mounted (Foam or Liquid Filled)	Pantograph (Shoe seal with typical carbon steel hangers)	Single Arm Support (Shoe seal with single arm pusher)	Scissor Shoe (Shoe seal with independent pushers)	SealMaster™	SM1 (Heavy Duty / Extreme Weather)
Emissions throughout 10 year life span	Not Recommended	Good	Good	Excellent	Best / BATǂ	Excellent
Conforms to shell roundness anomalies	Average	Average	Average	Best	Best	Best
Chemical, Corrosion & UV Resistance	Average	Good	Excellent	Best	Best	Best
Shoe stays level as rim space changes	N/A	•		•	•	•
Pressure distribution on shoe	N/A	6 points	3-6 points	10 points	Uniform Pressure / Full Contact	4 points
Roof centering capabilities / dampen movement	Not Recommended	Good	Average	Best	Best	Best
Abrasion resistance	Not Recommended	Best	Best	Best	Best	Best
Life expectancy	Not Recommended	Good	Good	Best	Best	Excellent
Applicable guidelines	API 650	API 650	API 650	API 650	EEMUA 159 (-X+3X), API 650, EN 14015	API 650, EEMUA 159, EN 14016
Capable of handling waxy shell residue	N/A	with wax scraper	with wax scraper	with wax scraper	with wax scraper	tested wax scraper**
Available in riveted tank option	N/A	•	•	•	•	•