Stress relieved welds in positive expulsion fuel tanks with elastomeric diaphragm

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United States of America Patent

PATENT NO 10139047
APP PUB NO 20170016574A1
SERIAL NO

14797352

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Abstract

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A metallic positive expulsion fuel tank with stress free weld seams may include a first hemispherical shell with a first edge; a pressurized gas inlet attached to the first hemispherical shell; and a metallic cylinder with first and second edges attached to the first hemispherical shell along matching first edges by a first weld seam. The tank may also include a second hemispherical shell with a first edge attached to a fuel outlet fixture. An elastomeric diaphragm may be attached to the fuel outlet fixture on the second hemispherical shell. The second hemispherical shell may be attached to the second edge of the metallic cylinder along matching edges by a second weld seam thereby forming a positive expulsion fuel tank with two interior chambers separated by the elastomeric diaphragm. The first and second weld seams may be subjected to a localized post-weld stress relief heat treatment in which heating of the tank is confined to a distance of 2 inches (5.08 cm) of the first weld seam and a distance of 2 inches (5.08 cm) of the second weld seam such that the stresses in the first and second weld seams are relieved and the elastomeric diaphragm is unaffected by the heat treatment.

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Patent Owner(s)

  • KEYSTONE ENGINEERING COMPANY

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ballinger, Ian Anaheim Hills, US 6 14
Tuttle, Wayne H Torrance, US 12 83

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