Spacer & Spade Flanges Suppliers

ASME B16.48 Paddle Blinds

Spacer & Spade Flanges Suppliers

ASME B16.48 Spacer & Spade Flanges: Dimensions | Specifications | Material Grade | Standards | About Paddle Blinds | All Product Types

We are a trusted manufacturer and exporter of Spacer & Spade Flanges, also known as Line Blinds, designed for high-integrity pipeline isolation. These flanges are installed between pipe sections to either stop (Spade) or allow (Spacer) flow in critical systems, making them ideal for industries such as oil & gas, petrochemical, power generation, marine, and offshore applications.

Unlike conventional valves, Spacer & Spade Flanges offer positive, mechanical isolation without any moving parts. They are typically used in process systems where routine maintenance, hydro testing, or complete shutdown is required. Operators can switch between open and closed status simply by replacing the plate — Spacer for flow and Spade for shut-off. Their handle extension is stamped with "OPEN" or "BLIND" for clear visual identification.

Nutech supply these flanges in Raised Face (RF) and Ring Type Joint (RTJ) facing types, with a wide range of materials such as Stainless Steel (304/316), Carbon Steel (A105), Alloy Steel, Duplex, Super Duplex, and special alloys like Inconel, Monel, and Hastelloy. Sizes range from ½″ to 24″ and pressure ratings from Class 150 to 1500 as per ASME B16.48.

All our Spacer & Spade Flanges are precision-manufactured and quality-tested to meet global standards. With custom dimensions, CNC machined edges, and export-grade packaging, we ensure reliable and leak-proof performance across demanding pipeline networks.

ASME B16.48 Spacer & Spade Flanges Manufacturer in Stainless Steel, Carbon Steel, Alloy Steel – Precision Engineered Line Blind Flanges

For complete technical details, including dimensions, pressure rating classes, weight charts, sizes, tolerances, and material specifications of our ANSI B16.48 Paddle Blinds, please download the full Catalog PDF below.

Open (Spacer) & Solid (Spade) Flange Plates Available from Class 150 to 1500 – Sizes ½″ to 24″ – Raised Face (RF) & Ring Type Joint (RTJ) Facing – Ideal for Maintenance Isolation

Technical Specifications of Spacer & Spade Flange

Specification Details
Type Spacer (Paddle Spacer) & Spade (Paddle Blank) – Line Blind Assembly
Design Standard ASME B16.48, API 590, MSS SP-44
Size Range ½″ to 24″ NB (DN15 to DN600) – Custom sizes available on request
Design Feature Manual pipeline isolation using spectacle blind-type system; Spade blocks flow, Spacer allows flow
Face Type Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF) – matching companion flange
Pressure Rating Class 150, 300, 600, 900, 1500 (as per ASME B16.48 – higher class on custom design)
Connection Type Installed between two pipe flanges using standard flange bolts (no welding required)
Testing Dimensional Inspection, PMI, UT (Ultrasonic), Hydro Test (if required), Third-Party Inspection
Surface Finish / Coating Anti-rust oiling, Black Paint, Epoxy, Hot-Dip Galvanized
Markings As per ASME B16.48 – Heat Number, Material Grade, Size, Pressure Class, Manufacturer’s Logo
Applicable Industries Oil & Gas, Petrochemical, Refineries, Power Plants, Offshore, Chemical Plants, Pipelines
Documentation EN 10204 Type 3.1 / 3.2, IBR Approval, ISO 9001, PED 2014/68/EU, NACE MR0175 / ISO 15156, ISO 9001
Origin Made in India (by Nutech Overseas)
Export Network USA, Europe, and Middle East

Complete Material Grade Chart - Class 150 Paddle Blinds Flange

Material Category Paddle Blinds Flange Grades
Stainless Steel Spacer & Spade Flange ASTM A182 F304 / F304L / F304H, F316 / F316L / F316Ti, F310, F309S, F317 / F317L, F321 / F321H, F347 / F347H, F904L, ASTM A351 CF3 / CF3M / CF8 / CF8M / CF8C, DIN 1.4301, 1.4306, 1.4307, 1.4311, 1.4401, 1.4404, 1.4408, 1.4409, 1.4541, 1.4571, 1.4550, 1.4435, 1.4539
Duplex Steel Spacer & Spade Flange ASTM A182 F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61, UNS S31803 / S32205
Super Duplex Steel Spacer & Spade Flange ASTM A182 F53 / F55 / F57 / F59 / F60 / F61, UNS S32750 / S32760
Carbon Steel Spacer & Spade Flange ASTM A105 / A105N, ASTM A350 LF2, ASTM A694 F52 / F56 / F60 / F65 / F70 / F80, ASTM A216 WCB, DIN 1.0460 / 1.0402 / 1.0619, Die Steel, Mild Steel
Alloy Steel Spacer & Spade Flange ASTM A182 F5 / F9 / F11 / F12 / F22 / F91, AISI 4130 / 4140
Nickel Alloy Spacer & Spade Flange Nickel 200 / 201, ASTM B564
Monel Spacer & Spade Flange Monel 400 (UNS N04400), Monel K500 (UNS N05500), ASTM B564
Inconel Spacer & Spade Flange Inconel 600 / 601 / 625 / 690 / 718 / 783 / X750, ASTM B564
Incoloy Spacer & Spade Flange Incoloy 800 / 800H / 800HT (UNS N08800), Incoloy 825 (UNS N08825), Incoloy 925, ASTM B564
Hastelloy Spacer & Spade Flange Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X, ASTM B564
Alloy 20 Spacer & Spade Flange Alloy 20 / 20Cb-3, Carpenter® 20, ASTM B462
254 SMO Spacer & Spade Flange SMO 254 / 6Mo, UNS S31254, DIN 1.4547, ASTM A182
Copper Nickel Spacer & Spade Flange Copper Nickel 90/10 (C70600), 70/30 (C71500), UNS C71640, ASTM B61 / B62 / B151 / B152
Copper Spacer & Spade Flange TP1, TP2, T1, T2, C10100–C12300, C14200–C17200, C21000–C71520, including C10930, C11000, C11400, C12000, C12200, C26000, C28000, C33000, C44300, C70600, etc.
Brass Spacer & Spade Flange Grades 3602, 2604, H59, H62, etc.
Aluminium Spacer & Spade Flange Aluminium Grades 5052, 6061, 6063, 2017, 7075, etc.
Titanium Spacer & Spade Flange ASTM B381 Gr.1 / Gr.2 / Gr.4 / Gr.5 / Gr.7, UNS R50250 / R50400 / R50550 / R50700 / R52400 / R53400 / R56320 / R56400
Other Special Grades Al6XN, Tin Bronze, Aluminium Bronze, Lead Bronze, Nimonic 75 / 80A / 90

International Flange Standards We Manufacture & Supply

What are the key differences between Paddle Blanks, Paddle Spacers, and Spectacle Blinds?

While all three—Paddle Blanks (Spades), Paddle Spacers, and Spectacle Blinds—serve similar isolation purposes in a piping system, the key difference lies in their design and usage:

  • Paddle Blank (Spade Flange): A solid disc used to stop the flow in a pipeline. Installed during shutdowns to achieve complete line isolation.
  • Paddle Spacer (Spacer Flange): A ring-like component with an open center, allowing normal flow when the blind is removed.
  • Spectacle Blind Flange: A single piece combining both a spade and a spacer, shaped like a pair of glasses. One end is solid; the other is open, and the unit is rotated depending on flow requirements.

In systems where frequent switching between open and closed positions isn't required, Paddle Spades and Spacers are used as separate components, making them easier to handle for larger pipe sizes.

When are Spacer & Spade Flanges preferred over Spectacle Blind Flanges?

Spacer and Spade Flanges are preferred over Spectacle Blinds in large-diameter or heavy-duty pipeline systems where weight, space, and handling flexibility are crucial. Unlike Spectacle Blinds (which are a single combined unit with both open and blind discs), Spade and Spacer Flanges are individual components used when there’s not enough room or lifting capacity to install a full spectacle blind.

They are ideal for ASME B16.5 and B16.47 flange systems, especially in Class 600 to Class 1500 pressure ratings, and are commonly seen in hydrocarbon processing, high-pressure steam lines, and offshore platforms. Because they are installed separately, they allow for easier handling, faster maintenance, and reduced downtime, making them highly efficient in critical shutdown and start-up operations.

Can Spacer and Spade Flanges be used in automated piping systems?

Yes, Spacer and Spade Flanges can be integrated into automated or remotely controlled piping systems, but typically require manual intervention for swapping the components. Unlike valve-based automation, Spade (blind) and Spacer (open) elements must be manually removed and installed during maintenance or system isolation.

However, in some critical operations, they're installed in easily accessible sections of the piping line, and flange joints are designed for quick access. Some modern facilities use hydraulic or mechanical lifting tools to streamline the changeover process.

These flanges are often chosen in automated systems when absolute line isolation is necessary and a valve alone may not provide full sealing under certain conditions.

Are Spacer & Spade Flanges suitable for high-pressure and high-temperature applications?

Yes, Spacer & Spade Flanges are specifically designed to handle high-pressure and high-temperature pipeline conditions. They are manufactured in accordance with international pressure class ratings such as ASME Class 150, 300, 600, 900, and 1500, and made from heat-resistant alloys like Stainless Steel 316H, Alloy Steel F11/F22, Inconel 625, and Super Duplex UNS S32750.

These flanges are commonly used in refineries, petrochemical plants, offshore platforms, and power plants, where precise line isolation is critical during maintenance or emergency shutdowns. Additionally, their flat-faced or raised-faced designs, and precise machining, ensure leak-proof performance under extreme operating conditions.

Why are Spacer & Spade Flanges preferred over valves in permanent line isolation systems?

Spacer & Spade Flanges offer a mechanically simple yet highly reliable method for complete line isolation, especially in systems that require frequent shutdowns or positive sealing. Unlike valves that can fail over time due to internal leakage or seat erosion, a spade or spacer provides 100% mechanical blockage, ensuring zero flow when closed.

They are widely used in:

  • Petrochemical units during maintenance shutdowns
  • Pipeline isolation in high-temperature or corrosive media
  • Offshore and subsea lines where space and safety are critical

Additionally, their visual indication (whether a spacer or spade is installed) improves safety and system transparency, which makes them indispensable in critical applications where a valve alone may not guarantee full isolation.

In which countries are Spacer & Spade Flanges from Nutech exported?

Our Spacer & Spade Flanges are trusted by EPC contractors, refineries, and process industries across over 40 countries worldwide. With a focus on quality, timely delivery, and international packaging standards, we have built strong export networks in:

  • United Arab Emirates (UAE) – Dubai, Abu Dhabi
  • Saudi Arabia – Dammam, Riyadh, Jubail
  • Qatar – Doha, Ras Laffan
  • Iraq, Kuwait, Bahrain
  • Singapore, Malaysia, Indonesia
  • Philippines, Sri Lanka – Colombo, Gampaha
  • Germany, Italy, France
  • USA, Canada, UK

Our logistics partners ensure safe transit to ports like Jebel Ali, Port Klang, Manila, Colombo, and Houston, Etc.

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