Standard Ring Spacer: Thermoplastic Flange Spacing for Lined Pipe Systems
A Standard Ring Spacer, also commonly referred to as a ring-type flange spacer or flow-through flange spacer, is a precision-cut thermoplastic component designed to fit between two flanges while allowing uninterrupted flow through the piping system. Featuring a centered bore that matches the pipe’s internal diameter, it maintains proper flange separation without restricting process flow.
Overview
SG-P manufactures Standard Ring Spacers specifically for lined-pipe systems, ensuring accurate dimensions, excellent chemical resistance, and long-term reliability in corrosive and non-metallic environments.
What Is a Standard Ring Spacer Used For?
Standard Ring Spacers are used when precise flange spacing is required without blocking flow. In many facilities, they may also be referred to as open-bore flange spacers or non-blind flange spacers. Regardless of terminology, their function remains the same—maintaining spacing while preserving flow continuity.
Typical uses include:
- Maintaining proper flange separation in lined-pipe systems
- Compensating for gasket thickness or compression
- Accommodating instrumentation or alignment adjustments
- Thermal isolation between flanges
- Corrosion protection in aggressive chemical service
Applications and Industries
- Chemical & Petrochemical Processing: corrosion-resistant spacing in aggressive environments
- Water & Wastewater Treatment: durable, non-metallic flange separation
- Pharmaceutical & Food Processing: sanitary, non-contaminating flow-through applications
- Power Generation & Utilities: thermal and dielectric isolation support
- Marine & Offshore Systems: corrosion-proof components for harsh environments
Thermoplastic Material Options
All Standard Ring Spacers are available in premium engineering plastics selected for chemical compatibility and durability:
- Polypropylene (PP): Cost-effective, lightweight, and resistant to many acids and alkalis
- PTFE (Teflon®): Exceptional chemical resistance and temperature performance
- PVDF (Kynar®): Flame-resistant, UV-stable, and highly durable for harsh environments
SG-P specifications are based on lined-pipe dimensions, and spacers can be custom-machined to meet specific thickness or application requirements.
Design Features
- Precision-machined for lined-pipe flange dimensions
- Center bore matched to pipe ID for unrestricted flow
- Non-conductive and corrosion-resistant materials
- Smooth sealing faces for optimal gasket contact
- Available in multiple sizes and thicknesses
- Compatible with Class 125 and 150 flange systems
Why Choose SG-P Standard Ring Spacers?
- Over 50 years of custom thermoplastic fabrication expertise
- In-house machining ensures tight tolerances and consistency
- Fast turnaround for standard and custom sizes
- Proven performance in corrosive and non-metallic piping systems
- Complete line of thermoplastic spacers including Ring, Full Face, Blind, Orifice, and Reducing designs
Request a Quote or Custom Configuration
Need a Standard Ring Spacer built to your exact specifications? SG-P offers made-to-order spacers—also known as ring-type or flow-through flange spacers—in various materials, sizes, and thicknesses to match your lined-pipe system requirements.
Request a Quote