External Floating Roofs Seals - Secondary Seals

Comparison Chart



HMT offers multiple secondary seals 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 secondary seals include a variety of configurations, component sizes and material options to handle any application and stored product. The HMT family of secondary seals provides excellent emissions control while also offering various performance capabilities such as weather-shedding, dealing with waxy shells, and optimizing working capacity.

Compare HMT’s External Floating Roof Secondary Seals

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

External Floating Roof Seals - Secondary Seals

Econo-Flex™*

Flex-A-Seal™*
(International  markets only)

Secondary Wiper

SEAL KING™


SEAL KING™
(With multiple wiper tips)

SealMaster™

Water shedding Best Best Good Excellent ExcellentExcellent**
Handles sticky crude Good Good Excellent Goodǂ
GoodExcellent
Handles cold weather Better Better Excellent Goodǂ
Good
Good
Foam dam height Standard Standard
Standard LowerLowerLower
Rim space 3-20"
3-20"3-20" 3-17" 3-17"3-30" 
-X+3X (EEMUA)
Local shell anomalies Good Good Excellent Excellent ExcellentExcellent
Heavy snow applications Excellent Excellent Good Not Recommended Not RecommendedGood
Rough shells / welds Good Good Excellent Excellent ExcellentExcellent
Capacity gains Average Average Average Excellent ExcellentExcellent
Applicable guidelines API 650 API 650 API 650 API 650 API 650EEMUA 159 (-X+3X), API 650, EN 14015

* Available with NST Tip

**With bolt on water shedding tip

ǂ The SEAL KINGTM is not recommended in applications with both very sticky crude and extreme cold temperatures