Method of making a foam insulated water heater

Details Method of making a foam insulated water heater Method of making a foam insulated water heater

1989-10-03

1991-06-11

Dawson, Robert A.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 469, 264262, B29C 6722

Patent

active

050230310

ABSTRACT:
A method of insulating a water heater with an expandable foam insulating material is provided. The expandable foam insulating material has an initial viscosity of<300 cps, a flow index.gtoreq.about 0.7, a gel index.gtoreq.about 0.8 and generates a maximum pressure of.ltoreq.about 1.0 psig. The foam is injected into the annular space between the water tank and the outer jacket. Preferably, the foam is injected into a sleeve, which acts to confine the foam during its most liquid state, positioned within this space. The foam is preferably injected into the annular space between the tank and the jacket while the top cover is removed. In this way, the injected foam can be distributed more evenly around the circumference of the tank.

REFERENCES:
patent: 3253731 (1966-05-01), Fink et al.
patent: 3793411 (1974-02-01), Stonitsch et al.
patent: 4372028 (1983-02-01), Clark et al.
patent: 4447377 (1984-05-01), Denton
patent: 4477399 (1984-10-01), Tilton
patent: 4628184 (1986-12-01), West
patent: 4632792 (1986-12-01), Clark

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