US4641862A — Rotationally molded nozzle liner and method for i…

Claim 1

Independent Claim 146 words

The combination of a nozzle liner free of internal stresses and seams and a vessel having an internal corrosion liner and a nozzle extending externally of the vessel with a distal ring flange, with said nozzle liner received in said nozzle and having: (a) a sleeve body having an outer diameter substantially equal to the inside diameter of said nozzle and a length greater than the length of said nozzle to provide an inward end which projects inwardly beyond the inside wall of said vessel and which is bonded to said corrosion liner of said vessel; and (b) an integral end flange on the outer end of said liner and abutted against the ring flange of said nozzle; said nozzle liner being formed by rotational molding a powdered thermoplastic resin to form said nozzle liner with said integral ring flange free of internal stresses and seams.

Claim 2

Dependent Claim 146 words

The combination of a nozzle liner free of internal stresses and seams and a vessel having an internal corrosion liner and a nozzle extending externally of the vessel with a distal ring flange, with said nozzle liner received in said nozzle and having: (a) a sleeve body having an outer diameter substantially equal to the inside diameter of said nozzle and a length greater than the length of said nozzle to provide an inward end which projects inwardly beyond the inside wall of said vessel and which is bonded to said corrosion liner of said vessel; and (b) an integral end flange on the outer end of said liner and abutted against the ring flange of said nozzle; said nozzle liner being formed by rotational molding a powdered thermoplastic resin to form said nozzle liner with said integral ring flange free of internal stresses and seams.

Claim 3

Dependent Claim 10 words

The combination of claim 1 formed of rotationally molded polytetrafluoroethylene.

Claim 4

Dependent Claim 25 words

The combination of claim 1 wherein said integral end flange has a diameter substantially equal to the diameter of said ring flange on said nozzle.

Claim 5

Dependent Claim 26 words

The combination of claim 1 having a length which exceeds the length of said nozzle by a distance from 0.5 to about 2.0 times its diameter.

Claim 6

Dependent Claim 20 words

The combination of claim 1 wherein said nozzle liner has a wall thickness from about 0.050 to about 0.375 inch.

Claim 7

Dependent Claim 51 words

The combination of claim 1 wherein said opposite end of said nozzle liner is a thermoformed annulus about the inner end of said nozzle which overlies the inner corrosion liner of said vessel to form a laminating region in which said thermoformed annular is bonded to the underlying inner corrosion liner.

Claim 8

Independent Claim 154 words

A method for installing a protective liner in a vessel having at least one ring-flanged nozzle wherein the vessel is internally lined with an inner corrosion liner, the improvement comprising: (a) rotationally molding a thermoplastic resin into a nozzle liner with a sleeve having an outer diameter substantially equal to the internal diameter of said nozzle, a length at least equal to the length of said nozzle, and an integral end flange, thereby forming said nozzle liner without internal stresses and without seams; (b) inserting said nozzle liner into said nozzle to seat its internal end against the outer face of the ring flange of said nozzle and to project its opposite end into adjacent proximity of the inner corrosion liner of said vessel which surrounds said the inner end of said nozzle; (c) bonding said opposite end of said nozzle liner to the inner corrosion liner of said vessel in a continuous bond.

Claim 9

Independent Claim 154 words

A method for installing a protective liner in a vessel having at least one ring-flanged nozzle wherein the vessel is internally lined with an inner corrosion liner, the improvement comprising: (a) rotationally molding a thermoplastic resin into a nozzle liner with a sleeve having an outer diameter substantially equal to the internal diameter of said nozzle, a length at least equal to the length of said nozzle, and an integral end flange, thereby forming said nozzle liner without internal stresses and without seams; (b) inserting said nozzle liner into said nozzle to seat its internal end against the outer face of the ring flange of said nozzle and to project its opposite end into adjacent proximity of the inner corrosion liner of said vessel which surrounds said the inner end of said nozzle; (c) bonding said opposite end of said nozzle liner to the inner corrosion liner of said vessel in a continuous bond.

Claim 10

Dependent Claim 34 words

The method of claim 7 wherein said opposite end of said nozzle liner to projected past the inside wall of said vessel to provide an end projection of a predetermined length inside said vessel.

Claim 11

Dependent Claim 49 words

The method of claim 7 including the steps of heating said end projection of said nozzle liner within said vessel to a thermoplastic condition and applying an axial force to said nozzle liner to axially compress said liner and flare said end projection radially outwardly into an annular ring.

Claim 12

Dependent Claim 47 words

The method of claim 9 wherein the length of said end projection is from 0.25 to about 2.0 times the diameter of said nozzle liner and said annular ring is thereby formed with a diameter from 1.5 to about 5 times the diameter of said nozzle liner.

Claim 13

Dependent Claim 36 words

The method of claim 10 including the additional step of compressing said annular ring against the inside wall of said vessel to laminate and bond said annular ring against the inner corrosion lining of said vessel.

Claim 14

Dependent Claim 27 words

The method of claim 10 including the step of heating said annular ring and the underlying portion of said inner corrosion lining while compressing said annular ring.

Claim 15

Independent Claim 190 words

A method for installing a protective liner in a vessel having at least one ring-flanged nozzle wherein the vessel is internal lined with an inner corrosion liner, the improvement comprising: (a) rotationally molding a thermoplastic resin into a nozzle liner with a sleeve having an outer diameter substantially equal to the internal diameter of said nozzle, a length exceeding the length of said nozzle by an amount from 0.25 to about 2.0 times its diameter, and an integral end flange, thereby forming said nozzle liner without internal stresses and without seams; (b) inserting said nozzle liner into said nozzle to seat its integral end against the outer face of the ring flange of said nozzle and to project its opposite end beyond the inner corrosion liner of said vessel by the aforesaid amount; (c) heating said end projection of said nozzle liner within said vessel to a thermoplastic condition; and (d) applying an axial force to said nozzle liner to axially compress said liner and flare said end projection radially outwardly into an annular ring having a diameter from 1.5 to about 5.0 times the diameter of said nozzle liner.

Claim 16

Independent Claim 190 words

A method for installing a protective liner in a vessel having at least one ring-flanged nozzle wherein the vessel is internal lined with an inner corrosion liner, the improvement comprising: (a) rotationally molding a thermoplastic resin into a nozzle liner with a sleeve having an outer diameter substantially equal to the internal diameter of said nozzle, a length exceeding the length of said nozzle by an amount from 0.25 to about 2.0 times its diameter, and an integral end flange, thereby forming said nozzle liner without internal stresses and without seams; (b) inserting said nozzle liner into said nozzle to seat its integral end against the outer face of the ring flange of said nozzle and to project its opposite end beyond the inner corrosion liner of said vessel by the aforesaid amount; (c) heating said end projection of said nozzle liner within said vessel to a thermoplastic condition; and (d) applying an axial force to said nozzle liner to axially compress said liner and flare said end projection radially outwardly into an annular ring having a diameter from 1.5 to about 5.0 times the diameter of said nozzle liner.

Claim 17

Dependent Claim 47 words

The method of claim 13 wherein the length of said end projection is from 0.5 to about 1.0 times the diameter of said nozzle liner and said annular ring is thereby formed with a diameter from 2 to about 3 times the diameter of said nozzle liner.

Claim 18

Dependent Claim 27 words

The method of claim 13 including the step of heating said annular ring and the underlying portion of said inner corrosion lining while compressing said annular ring.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1990-02-09	1990-08-11	1991-02-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1994-02-09	1994-08-11	1995-02-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1998-02-09	1998-08-11	1999-02-10	$7700.00	Window Closed / Lapsed

Rotationally molded nozzle liner and method for its installation

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