Phosphating unit

Customer’s technical assignment: design and development of a mobile phosphating unit.

The unit is designed to apply a phosphate coating on the threaded ends of pipes by spraying and on the threaded surface of collars by dipping.

Special feature: mobile design mounted in a 20 ft. container.

The project is completed in August 2021.

Customer: pipe manufacturer

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The station is designed to apply manganese and phosphate or zinc and phosphate coating on the surface of threaded connections (threat, sealing and bearing faces) of collars. Zinc and phosphate coating are applied to the surface of the threaded connection of pipes.

The station is a mobile module mounted in a 20 ft. Marine container specifically modified to work in the complex conditions of a drilling site: compact size, fast deployment, low temperatures, frequent relocations.

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technical specifications

The unit comprises a two-section tank and a moving coating chamber with sprinkler nozzles. The enclosure of the unit rests on two supports with adjustable height. The tanks maintain working temperature for the activation of the solution by means of a 15 kW heating cable. The tanks are heat insulated with rock wool.

The manganese and zinc phosphating unit has internal dimensions of 1200х1200х750 mm and is made from specialty stainless steel. In the top part of the unit, there are guides for the movement of the sprinkler nozzle chamber.

The internal surface of the container is heat insulated. The working area is lined with acid resistant sheet steel. The container is divided into the working and material storage areas. The material of internal lining of the container is resistant to moisture.

The station is mounted in a standard 20 ft. container, which facilitates its transportation by truck to the location of field operations.

Solution of chemicals used in the station

Manganese-phosphate (Zinc-phosphate)

Coating thickness, µm

2 … 100

Pipe (collar) diameter, mm

60 … 346

Max collar length, mm

1,000

Range of working temperatures of the chemical solutions, °C

40 … 105

Material of the coating unit

AISI 316 stainless steel

Performance per hour, collars, pcs

15

Performance per hour, pipes, pcs

2

Alternate current voltage, V

220, 380

Current frequency, Hz

50

Compressed air pressure, bar

5 - 7

Total consumed power, kW

15

Fresh water consumption per 8 hour shift, l

50

Utility parameters