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Powder Coating

This document provides work instructions for powder coating valves. It outlines the objectives, application system used, curing schedule, coating finishes available, procedures, precautions, and responsibilities. The procedures describe preparing the surfaces, loading the powder coating, spraying uniformly, curing in a furnace between 180-210°C for 10-12 minutes, inspecting the quality, and measuring coating thickness. A QA engineer is responsible for ensuring the painting is done according to specifications and customer requirements.

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raghbir
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2K views2 pages

Powder Coating

This document provides work instructions for powder coating valves. It outlines the objectives, application system used, curing schedule, coating finishes available, procedures, precautions, and responsibilities. The procedures describe preparing the surfaces, loading the powder coating, spraying uniformly, curing in a furnace between 180-210°C for 10-12 minutes, inspecting the quality, and measuring coating thickness. A QA engineer is responsible for ensuring the painting is done according to specifications and customer requirements.

Uploaded by

raghbir
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Ref Issue Date

No. "WORK INSTRUCTION FOR POWDER


COATING"
Rev no. 00
Page 1 of 2
Rev Date. ---

OBJECTIVE

The work instructions cover activities to be carried out for powder coating on valves.

• Product painting is carried out as per the requirement given in Work Order.
• QC Engineer is responsible to see that the painting is carried out as per Work Order/ Customer Req.

Application system: Electrostatic Spray Gun with Flat jet spray nozzles
Voltage: 60 – 90 KV
Curing Schedule: Between 180 - 210°C for 10 - 12 mins
Coating Finish: Glossy /Semi glossy/Matt

Procedure

• Before powder coating ensure that all products/ i t e m s a r e c o m p l e t e l y d r y f r o m i n s i d e


and outside,if any water traces or foreign material is there then dry it with
air/cotton cloth.
• Surface Finish of items should be as per MSS-SP-55 and should be grease free.
• Before starting of painting the workplace should be properly cleaned.
• Load the required coating powder (Colour-Red/Blue/Black) to the spraying system.
• Hang the item in booth, spray the powder uniformly on all sides.
• Wherever powder coating is not required, carefully remove the powder from that area with
compressed air.
• Hang the sprayed item on hanger stand.
• Start the box type furnace (Gas fired) and set heating temperature to 210C.
• When the furnace temperature reached 60c, open its door and place the loaded stand inside it.
• When the temperature reached to required temperature, then soak the items for 10 mins at same
temperature.
• Turn of the furnace.
• Partially open the furnace door when temperature drops to 100c.
• When temperature drops to 60C, remove the stand from furnace and remove items from stand
• QC Engineer must ensure that the Quality of painting is proper by 100% visual check.
• If required by customer, coating thickness is measured against qty. specified in work order.
• Overall coating thickness shall be min. 60 micron or as specified in customer’s requirement.

Prepared By Approved By

QA Engineer Management Representative


Date
Ref Issue Date
No. "WORK INSTRUCTION FOR
Rev no. A
Rev Date.

Precautions

• Make sure that that air supply to powder coating gun is dry.
• Relative temperature of material at the time of painting shall be 25°C ±15°C.
• Relative humidity at the time of painting shall be Max. 85%.
• Paint Spray Gun and Object distance shall be between 9" - 12".
• On completion of painting, powder coating gun to be properly cleaned and kept ready for next
operation.
• Unused powder paint must not be left open.
• Keep in dry cool condition, Avoid Sunlight/UV light.

Prepared By Approved By

QA Engineer
Management Representative
Date

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