Blind Flanges

Instinox is one of the leading manufacturer, supplier, and exporter of a wide range of Blind flanges all over the world. We are affianced to provide an extensive range of different industrial applications. The range is decided as per the Blind flanges rigorous quality control checks make it superior to other similar products available in the market. Our Firm also specializes in forged Blind flanges manufactured to meet the international standards as well as cater to our customers’ needs of various international industries all our world with or without inspection of the third party. Instinox brings a lot of experience in the industry by serving for over 15 years and also as we have bonds and contracts with many leading companies. The products we provide are of high corrosion resistance, dimensional accuracy, extraordinary quality, durability and smooth surface finish. The Instinox Buying experience is one to remember. This quality makes our customers trust our firm.

Blind flanges are an external or internal ridge or rim used for giving additional strength, stiffness or a supporting area to objects attached to it. Flanges can also be defined as a ring or a collar, usually provided with holes for bolts and screwed or welded over the ends of a tube or a pipe to permit other objects to be attached to it. The blind flange is a common and a popular product in the category of flanges. A blind flanges like other flanges is used to close the ends of piping systems. Blind flanges are pipe flanges used to tape the end of a piping system openings to prevent flow. Blind flanges are commonly used for pressure testing of the pressure flow of liquids or gases through a pipe or vessel.

Blind Flange can also be called BLRF FLANGE, BLIND FLANGE R F, BLANK FLANGE, B16.5, ASTM A105, BLFF FLANGE, for better reference.

• • Standard: ANSI, ASME, ASA B16.5
  • Size: 1/2” – 48”
  • Material: ASTM A105, CARBON STEEL
  • Supply Ability: 3000Ton/Month
  • Process: Forged, Forging
  • Packing: Plywood Pallets
  • Payment Terms: T/T, L/C, D/P
  • Monthly output: 3000Ton,
  • Material: carbon steel & Stainless Steel.

• ANSI: ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
• DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
• B.S: BS4504, BS4504, BS1560, BS10
• OTHERS: PLATE, PLATE BLANK

Blind flanges areas in the custom individually wrapped by hand to ensure that finest quality of the material is maintained and no damage in the last stage of production. Blind flanges come with heat number tractability and brand marking for proper identification of all products.

• Stainless steel
• Aluminum
• Silicone
• Cast Iron
• Titanium
• Bronze
• Brass
• Nickel alloy
• PVC etc.
• Polypropylene
• Nickel alloy
• Carbon steel

The manufacturing process includes six major steps namely:

• Cutting
• Open and Closed Die Forging
• Heat Treatment
• Conventional and CNC Machining
• Inspection and Quality Check
• Packing and Dispatch

Steam hammer technology is used for our manufacture of forging products. It is based on open die forgings and drops hammer closed die forgings. Visual and dimensional checking of raw material is done when, after the steel is received from the manufacturer. The stocks of SS and CS material are kept separately for fast access and simple distinction. The color coding scheme to every unit of raw material is applied as per the color code. The color coding scheme assists, to foot-mark the material during the manufacturing process. The criterion test certificate which is received from suppliers for raw material is studied. Then, physical and chemical testing of each material is done. The various types of raw material are given lot no. and details such as the source of supply heat number, supplier’s certificate number, or a lot number of the company are decided. Internal Granule Corrosion testing and ultrasonic testing is done. Cutting and marking the materials are stamped with lot number for identity proof. The manufacturing division raises appropriation test for material the company wants to use in their process. The material is issued symbolizing the lot number. The required material’s length and weight are verified. The raw materials, which are in the shape of long rods of different diameters, are chopped with the use of huge saw cutting machines. A QC and inspection test is done to overview the flanges. Lastly, the flanges are assorted and packed for dispatch.

• Natural gas companies
• Chemical industries
• Petroleum
• Ship building
• Paper making
• Marine projects
• Metallurgy
• Electric power boiler etc.

• Blind flanges are supplied with NTO fittings which allow pressure test connections to be fitted.
• They are used to blank off the ends of valves, pressure vessel openings and ends of pipes.
• Considering factors like internal pressure and bolt cramping, especially in the larger sizes are the most highly stresses of all types of flanges.
• They are made to fit standard pipes in all sizes

All products are given brand marking and heat number traceability and marked with Grade, lot no. , size, degree, and our firm’s trade mark for identification purpose. Products are also packaged to ensure that there is no damage during transit. Standard export packaging is done in wooden cases in case of exports. We also make customized orders as per our client’s requests.

At Instinox, all fittings and flanges are subject to strict inspection and quality checks at all stages of the manufacturing process, from starting material purchasing to product dispatch. They are visually examined for conformity to ASTM, ASME, MSS, DIN, EN, and JIS codes and standards. At Our requests, official certified agencies are called to witness the material reports, dimension and quality conformity of products.

Test Certificates are given to the manufacturer after a third party inspection under the standards: EN 10204/3.1B, Raw materials Certificate, 100% Radiology Test report Test Certificate.