Apparatus for coating exterior weld joints of a pipe

Details Apparatus for coating exterior weld joints of a pipe Apparatus for coating exterior weld joints of a pipe

1993-01-04

1994-10-04

Savage, Matthew O.

Coating apparatus

Control means responsive to a randomly occurring sensed...

Responsive to attribute, absence or presence of work

118683, 118684, 118305, 118315, 118DIG11, B05C 500

Patent

active

053522923

ABSTRACT:
An external pipe covering apparatus is provided for coating exterior surfaces of uncoated longitudinal, helical and girth weld joints of a pipe to provide protection against corrosion, to minimize the weld projection by filling in any voids on either side of a weld, and to further provide a uniform smooth surface for a later applied tape. The apparatus is moved along a pipe by a crane or similar mechanical device. The apparatus has a carriage to which is attached wheels, a reservoir attached to the upper frame of the carriage for holding liquid resin, a circular member having at least one sensor therein attached to the lower frame of the carriage, a microprocessor attached to the upper frame of the carriage, a circular dispenser for dispensing liquid resin having at least one nozzle and at least one solenoid valve attached to the lower frame of the carriage for dispensing resin from the reservoir, and a pump for delivery of liquid resin to the nozzle. In operation, a sensor or sensors send electrical signals to a microprocessor, which then sends an electrical signal or signals, depending on the type of weld joint sensed, simultaneously to a corresponding solenoid valve or valves and a positive displacement pump. The pump when activated pumps liquid resin to a nozzle(s) through the activated and open solenoid valve(s). The resin is then sprayed by the nozzles onto the weld joint area.

REFERENCES:
patent: 2175392 (1939-10-01), Henry
patent: 2488519 (1949-11-01), Andrews et al.
patent: 2535451 (1950-12-01), Phillips
patent: 4953496 (1990-09-01), Taylor et al.
patent: 5203923 (1993-04-01), Hartman

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