Title: Full secondary seal, wiper type, for a floating roof tank

Abstract: In a vertical cylindrical liquid storage tank having a circular floating roof, an improved sealing means including an elastomeric composite strip impermeable to vapor connected at its inner edge by an essentially vapor tight joint to the roof edge and extending as an annulus outwardly to the tank inner side wall, the elastomeric composite strip comprising a plurality of flexible resilient elongated stiffeners laterally positioned and embedded in elastomeric material, and the elongated stiffeners extending from the strip edge joined to the roof and terminating short of the strip edge at the tank wall. An elastomeric composite strip, impermeable to petroleum vapor, having a plurality of flexible resilient elongated stiffeners laterally positioned and embedded in elastomeric material, with the elongated stiffeners extending from one strip edge and terminating about at the other strip edge.

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Inventors: McCabe, John S. (Naperville, IL, US)

Application Number: 836577
Filing Date: 1977-09-26
Publication_date: 1979-02-06
Assignee: Chicago Bridge & Iron Company (Oak Brook, IL)
Primary Class(es): 220/224 277/555, 277/562, 277/569
Other Classes:
US Patent Ref:

1698158	Jan, 1929	Glass	220/222.
2560557	Jul, 1951	Curtis	277/152.
2723721	Nov, 1955	Corsette	277/152.
2973113	Feb, 1961	Fino	220/224.
3167206	Jan, 1965	Nelson	220/224.
3204809	Sep, 1965	Cadwell	220/222.
3269738	Aug, 1966	Baumler et al.	277/81.
3372831	Mar, 1968	Daniels et al.	220/222.
3795339	Mar, 1974	Barbier	220/222.
4004708	Jan, 1977	Boyd	220/224.

Other Refs: 1610801980791277238837814

Feb, 1955	AU
Jun, 1958	AU
Oct, 1961	FR
Jun, 1960	GB

Primary Examiner: Ward, Jr., Robert S.
Assistant Examiner:
Attorney: Merriam, Marshall & Bicknell