Internal Floating Roof Seals - Secondary Seals

Comparison Chart

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

Compare HMT’s Internal Floating Roof Secondary Seals

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

Internal Floating Roof Seals - Secondary


Flip Flop Wiper

Seal King™
(with multiple wiper tip)


Handles sticky crude Not Recommended Not Recommended Good Best
Handles cold weather Good for light products Good for light products Best Best
Handles sticky + cold Not Recommended Not Recommended Not recommended Best
Handles riveted tanks Not Recommended Good Not recommended Best
Rim space 3-11" 3-9.5", wider if customized 3-17" 3-30"
-X+3X (EEMUA 159)
Local shell anomalies Good Good Excellent Excellent
Rough shells / welds Good Poor Best Best
Capacity gains Good Good Good Good
Applicable guidelines API 650 API 650
EN 14015
API 650
EN 14015
API 650, EEMUA 159
EN 14015