Flanges Manufacturing Process

Bangdong pipeline technology manufacturing process is highly sophisticated and is divided into various departments supervised by experienced industry experts. We use only quality raw materials that are procured from only established and reliable vendors. We have adopted rigorous quality control practices and procedures to ensure the production of only quality products matching industry standards and parameters.

Understanding customers requirement and ensuring to supply as per these requirements is realised with the help of quality assurance at Bangdong one of the best Flange Manufacturers in China , our product range include all types of flanges such as MS Flange ( Mild Steel ) , Raised face flange , Weld neck flange, Bellow Flange , and Flanges according to custom requirement.

1. Raw Material

• Raw Material Check
• Quantity Check
• Visual & Dimension Check

2. Material Inspection

• Chemical Analysis Check
• Preservation Analysis Certificate

3. Material Cutting

• Weight Measuring
• Cut Surface Check
• Marking

4. Flange forging

• Material Grade Check
• Weight Measuring
• Temperature Control

5. Heat Treatment

• Normalizing
• Tempering, Q.T
• Solution Treatment
• Mechanical Test

6. Forging Rolling

• Material Grade Check
• Weight Measuring
• Temperature Check
• Dimension Check

7. Final Inspection

• Dimension size inspect
• Visual Test
• Nondestructive Test

8. Rust Prevention

• Preserve Check
• Marking on the flange

9. Well Packing

• Packing Spec. Check
• Packing Inspection
• Delivery

Requirements are valid for normal situation, in special you have to contact us to introduce.

Our machining and assembly operations have a complete line of metal removal equipment including turning, boring, milling, drilling, grinding, polishing, welding and have testing equipment to manufacture forged steel fittings and valves. This facility also contains all the necessary equipment to support these operations including work holding and cutting tool needs.

Raw Materials:

Beginning with this process,the system controls the quality of all incoming materials as per the raw material test certificate of the material. Mild Steel Flanges ( MS ) are of premium quality that ensures high durability, strength and resistivity to varied non-supporting conditions. Also, checking in each size for chemical and physical properties of these materials at Government approved laboratory.

Flange materials acc. to ASTM

Dimensions from carbon steel and stainless steel flanges are defined in the ASME B16.5 standard. The material qualities for these flanges are defined in the ASTM standards.

The normal rust prevention treatment for steel flanges include yellow (Golden) paint Coating, black paint coating or black phosphating treatment, varnish paint coating, varnish antirust oil coating, electro galvanizing coating (Cold), hot dip galvanizing coating etc.

The Packing Works for Steel Flanges  >>

Steel flanges must be packed with seaworthy packing method then delivery to customers, usually the packing way include wooden box, wooden pallet, iron & steel cage, iron & steel pallet etc. Because of the normal wooden boxes or wooden pallets have to do fumigation treatment, we usually use plywood pallet or plywood case or box to pack steel flanges without fumigation treatment. Whatever plywood or iron & steel packing way, they must be seaworthy, strong, waterproof and easy for loading and unloading.

Marking on the flange

• Manufacturer logo
• ASTM material code
• Material Grade
• Service rating (Pressure-temperature Class))
• Size
• Thickness (Schedule)
• Heat No
• Special marking if any QT (Quenched and tempered) or W (Repair by welding)

The final process of dispatch is the most tedious of all , and heavy duty cranes are used for it. With the help of our extensive delivery chain we can ensure time critical deliveries at the behest of our esteemed clients. We are indeed privileged to be able to serve and live up to their expectations and occupy unparalleled position of Flange makers in China.

www.bd-pipefitting.com