Spacer Ring

What is Spacer Ring

A Spacer Ring, also called Paddle Spacer, Ring Spacer, or Line Spacer, is an open ring plate installed between two flanges to allow pipeline flow.

Unlike a spade flange, which is a solid blind plate used to block flow, a spacer ring has an open bore that keeps the pipeline in normal operating condition.

Spacer rings are commonly used together with spade flanges. When the pipeline needs to operate, the spacer ring is installed. When the pipeline needs to be isolated, the spacer ring is removed and replaced by a spade flange.

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Spacer Ring Specifications

Standard	Type	Class / Pressure Rating	Size Range	Material Options
ASME B16.48	Spacer Ring / Paddle Spacer	Class 150-2500	NPS 1/2”-24”	ASTM A105, A182, A350
ASME B16.5	Custom Spacer Ring	Class 150-2500	NPS 1/2”-24”	Carbon Steel, Stainless Steel
ASME B16.47	Large Size Spacer Ring	Class 75-900	NPS 26”-60”	Carbon Steel, Alloy Steel
EN / DIN	Ring Spacer / Line Spacer	PN6-PN100	DN15-DN1200	Carbon Steel, Stainless Steel
JIS	Spacer Ring	5K, 10K, 16K, 20K	DN15-DN1000	SS400, SUS304, SUS316
Custom Drawing	Non-standard Spacer Ring	Customized	Customized	Customized Materials
Sealing Surface	RF, FF, RTJ, Custom Face	-	-	-
Coating	Black Paint, Anti-rust Oil, Galvanizing, Epoxy	-	-	-

Additional Specifications:

• Type: Spacer ring, paddle spacer, ring spacer, line spacer
• Structure: Open ring plate with handle or paddle extension
• Face Type: Raised face, flat face, ring joint face, customized sealing face
• Installation: Installed between two standard pipe flanges
• Custom Service: Special OD, ID, thickness, handle length, handle width, marking, coating available

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Spacer Ring Materials & Grades

Spacer rings can be supplied in different materials according to working pressure, temperature, pipeline medium, corrosion environment, and project standard.

Material	Grade
Carbon Steel	ASTM A105, Q235, S235JR, ASTM A350 LF2
Alloy Steel	ASTM A182 F1, F5, F9, F11, F12, F22, F91
Stainless Steel	ASTM A182 F304, 304L, F316, 316L, 321
Duplex Steel	F51, F53, F55, S31803, S32205, S32750
Nickel Alloy Steel	Inconel 600, Inconel 625, Incoloy 825, Hastelloy C276
Copper Alloy	CuNi 90/10, CuNi 70/30
Custom Material	According to customer drawings and project requirements

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Spacer Ring Dimensions

Spacer Ring Dimension Drawing

Dimension Item	Description
OD	Overall outside dimension
ID	Inside diameter / open bore
Thickness	Plate thickness
Ring Diameter	Diameter of the open ring section
Handle Length	Length of handle or paddle extension
Handle Width	Width of handle or paddle extension
Bolt Hole	Bolt hole quantity and diameter
BCD	Bolt circle diameter
Sealing Face	RF, FF, RTJ, or customized sealing surface

Spacer rings can be manufactured according to ASME B16.48 standard dimensions or customer drawings. Key dimensions include outside diameter, inside diameter, thickness, bolt circle diameter, bolt hole diameter, sealing face, handle length, and handle width.

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Advantages of Spacer Ring

Maintains Normal Pipeline Flow

The open ring structure allows fluid to pass through the pipeline during normal operation.

Used with Spade Flange

Spacer rings are commonly paired with spade flanges to switch between open and blocked pipeline conditions.

Clear Operating Status

The handle or paddle extension helps operators identify whether the line is open or isolated.

Reliable Sealing Performance

Accurate machining and proper sealing face treatment help reduce leakage risk between flanged joints.

Multiple Standard Options

Products can be manufactured according to ASME B16.48, ASME B16.5, ASME B16.47, EN, DIN, JIS, and custom drawings.

Wide Material Selection

Carbon steel, stainless steel, alloy steel, duplex steel, nickel alloy, and customized materials are available.

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Applications

Oil and Gas Pipelines

Used in crude oil, natural gas, refinery, and offshore pipeline systems where open-flow operation is required.

Petrochemical Plants

Suitable for process lines that require switching between spacer rings and spade blinds during maintenance.

Chemical Processing

Stainless steel and alloy spacer rings are used for corrosive and hazardous chemical media.

Power Generation

Applied in steam, cooling water, fuel gas, and auxiliary pipeline systems.

Refinery Systems

Used with spade flanges and spectacle blinds in process isolation systems.

Marine and Shipbuilding

Suitable for ship pipeline systems, fuel lines, seawater lines, and process piping.

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Why Choose Us

Comprehensive Manufacturing Capability

We coordinate cutting, forging, heat treatment, machining, drilling, surface treatment, inspection, and packaging under one production system.

International Standards Compliance

Our products meet ASME B16.48, ASME B16.5, ASME B16.47, EN, DIN, JIS, and customer drawing requirements.

Customized Production Support

We can manufacture spacer rings with customized thickness, OD, ID, bolt holes, sealing face, handle length, handle width, and material.

Strict Quality Inspection

Each batch is inspected for material grade, dimensions, thickness, bolt hole accuracy, surface finish, sealing face, and appearance.

Wide Material Options

Carbon steel, stainless steel, alloy steel, duplex steel, nickel alloy, and customized materials are available.

Export Packaging Support

Anti-rust treatment, wooden case packaging, steel frame packaging, and customized marking are available for international shipment.

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FAQ

Q: What is a Spacer Ring?

A: A spacer ring is an open ring plate installed between two pipe flanges to allow pipeline flow during normal operation.

Q: What is the difference between Spacer Ring and Spade Flange?

A: A spacer ring has an open bore and allows flow, while a spade flange is a solid plate used to block flow.

Q: What standard is commonly used?

A: ASME B16.48 is commonly used for spacer rings, spade flanges, and spectacle blinds. Custom drawings can also be supplied.

Q: Can Spacer Ring be customized?

A: Yes. OD, ID, thickness, bolt holes, sealing face, handle length, handle width, material, coating, and marking can be customized.

Q: Where are Spacer Rings commonly used?

A: They are commonly used in oil and gas, petrochemical, chemical processing, refinery, power generation, marine, and industrial pipeline systems.

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Contact Us

Ready to enhance your pipeline isolation system with premium Spacer Ring solutions? Contact kevin.zhao@hkflange.com for technical specifications and competitive quotations today.

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