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Spade and Spacer Flange Set

Incorrect isolation during maintenance or startup often leads to leakage, joint damage, or shutdowns. Our Spade and Spacer Flange Sets offer quick-switch blanking with flange-matched thickness, bolt pattern, and sealing surfaces. 

Standard Specification

ASME B16.48 (Heavy Duty), MSS SP-53 (Standard), API 590 (High Pressure)

Pressure Rating

Class 150 to 2500 (PN10 to PN420) [Matches mating flange rating]

Material

Carbon Steel (A516 Gr.70), Stainless Steel (A240 316/316L), Duplex (A790 UNS S31803)

Nominal Size

½” to 60″ (DN15 to DN1500) [Spacer length typically 1.5×flange thickness]

Flange Type

Spade (Blind) + Spacer (Ring) as separate components
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Product Description

We cut each set as per ASME B16.48 with matched facing, gasket fitment, and ±0.8mm bolt alignment for hassle-free rotation. Material grades include A516 Gr.70, A240 316/316L, and S31803 to match your pipeline spec. 

Facing Type

Matches mating flange (RF, FF, or RTJ) [Both sides identical]

Dimensions

Spade thickness = mating flange thickness +2mm [Per ASME B16.48 Table 1]

Bolt Circle Diameter

Matches mating flange (ASME B16.5) [±0.8mm tolerance]

Number & Size of Bolt Holes

Matches mating flange [Holes aligned for easy rotation]

Surface Finish

125-250 μin RA (RF), 63-125 μin RA (RTJ) [Both faces identical]

Corrosion Resistance

Material-matched to mating flange [Optional clad/spray coatings]

Temperature Rating

-29°C to +538°C (material-dependent) [Same as mating flange]

Material Certification

EN 10204 3.1, NACE MR0175 (for sour service), PED 2014/68/EU

Gasket Compatibility

Matches mating flange [Often supplied with captive gaskets]

Coating/Plating

HDG (carbon steel), Passivation (stainless) [No coating on sealing faces]

Manufacturing Method

CNC-cut from plate (A516) + edge machining [No forgings for spacers]

Technical Advantages

We manufacture each flanges set from certified plate material using CNC cutting and finish machining. Spacer thickness matches flange specs plus 2mm per ASME B16.48 Table 1 for sealing integrity. 

Facing options include RF, FF, or RTJ with surface finishes between 125–250 μin RA (RF) or 63–125 μin RA (RTJ) for leak-proof performance. Bolt holes match B16.5 tolerances, and both faces are finished identically to prevent sealing imbalance. 

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Industry Applications

Offshore Oil Rigs

Spacer length and RTJ surfaces comply with API 590, enabling safe isolation for risers and blowout preventers under Class 2500 pressure cycles. 

Refinery Piping Loops

Spades cut from A516 plates withstand up to 538°C and work with HDG coating for resistance to sulfur-rich atmospheres. 

Petrochemical Valve Banks

Enables segment isolation with easy-to-rotate spacers that match MSS SP-53 dimensions and bolt hole patterns. 

FPSO Modules

Dual-component sets simplify maintenance separation in congested modules where weight and orientation tolerance are critical. 

High-Pressure Steam Lines

Spacer-blind interchange handles thermal shifts and high torque loads without misalignment or sealing compromise. 

Cryogenic Transfer Lines

Duplex spacers retain bolt integrity down to -29°C, reducing brittleness near cold box assemblies and loading bays. 

Spade and Spacer Flange Set

Flange Sets That Align with Your Line-Side Needs

Mismatch in spacing or sealing face finish can disrupt operations or delay maintenance cycles. Our spade and spacer flange sets reduce risk by adhering to standard codes, sealing norms, and gasket compatibility. 

You get traceable material, matched dimensions, and weld-free construction that supports long-term isolation safety. This reduces the need for rework, secondary machining, or dimensional adjustments onsite. 

Spade and Spacer Flange Set

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Having Doubts? Our FAQ

Check all our Frequently Asked Question

Are your spade and spacer sets interchangeable across pressure classes?

No, each set is manufactured to match specific pressure class dimensions, from Class 150 to 2500. We align spacer thickness and bolt circle to the exact flange rating. This avoids sealing mismatch or overloading during service.

Can you supply duplex or sour-service certified materials?

Yes, we offer spade and spacer flange sets in Duplex (S31803) with NACE MR0175 certification. These sets suit high-sulfur or chloride environments common in offshore or refining units. All materials carry EN 10204 3.1 certification.

How do you ensure bolt holes align with the mating flange

We follow ASME B16.5 bolt circle and apply ±0.8mm tolerance on hole positions. This keeps holes in-line for fast rotation between spade and spacer. No on-site re-drilling or slotting is needed.

Do your flange sets require any surface rework before installation?

No, all sealing faces are finish-machined to 125–250 μin RA for RF or 63–125 μin RA for RTJ. We supply both components with identical facing and gasket-ready finish. This removes the need for lapping or field machining.

Can you match non-standard spacer lengths for specific valve clearances?

Yes, we offer custom spacer lengths based on flange thickness and line clearance needs. Buyers often specify 1.5× or 2× flange thickness for tight-fit loops. We CNC-cut to the exact length and maintain perpendicularity to prevent bolt stress.

Can Frigate support urgent or shutdown-critical delivery timelines?
  • Yes, Frigate prioritizes shutdown and turnaround requirements with expedited production slots 
  • CNC profiling and in-house machining reduce lead time dependencies 
  • Frigate maintains ready plate stock (A516, SS, Duplex) for faster execution 
  • Typical fast-track delivery can be aligned within 2–4 weeks based on size/class 
Does Frigate provide inspection, testing, and documentation with each order?
  • Yes, all Frigate orders include EN 10204 3.1 material test certificates 
  • Dimensional inspection reports and bolt alignment verification are provided 
  • Optional third-party inspection (TPI) from agencies like BV, SGS, TUV 
  • NACE compliance and PMI testing available on request 
Can Frigate handle bulk or project-based spade and spacer flange set requirements?
  • Frigate supports high-volume and EPC project orders with batch consistency 
  • Dedicated production planning ensures uniform thickness and tolerance control 
  • Packaging and tagging aligned with project-wise identification systems 
  • Flexible dispatch schedules to match site readiness or phased delivery 
How does Frigate ensure consistency between spade and spacer pairs?
  • Frigate manufactures both components from the same plate batch for uniformity 
  • Identical facing finish applied to avoid sealing imbalance 
  • Strict adherence to matched thickness and bore alignment 
  • Each pair is marked and traceable to prevent mix-up during installatio
Does Frigate offer packaging suitable for export and offshore handling?
  • Yes, Frigate uses heavy-duty wooden crates or pallets for export shipments 
  • Components are protected with anti-corrosion wrapping and edge guards 
  • Clear labeling with size, class, material grade, and heat number 
  • Suitable for sea freight, offshore lifting, and long transit durations 
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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

Other Locations

  • Bhilai
  • Chennai
  • India
  • Germany
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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Other Locations

  • Bangalore
  • Chennai
  • Coimbatore
  • Germany
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Become a Supplier

GENERAL ENQUIRIES

  • manufacture@frigate.ai
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Spade and Spacer Flange Set

Need reliable wires and cables for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Get Latest Price

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Spade and Spacer Flange Set

Need reliable Machining for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Get Latest Price

Get Price Form