Hanger

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Hanger

What is Hanger?

A structural support device used to suspend or support pipes, ducts, conduit, and other building systems from ceilings, walls, or structural members, providing secure attachment while allowing for thermal expansion and vibration control.

Description

A hanger is a structural support device used to suspend or support pipes, ducts, conduit, and other building systems from ceilings, walls, or structural members, providing secure attachment while allowing for thermal expansion, vibration control, and proper system alignment. These essential building components ensure that mechanical, electrical, and plumbing systems are properly supported throughout their service life while maintaining accessibility for maintenance and preventing damage from building movement, thermal cycling, and operational stresses. Hangers are critical for system performance, building safety, and code compliance in commercial, industrial, and residential construction.

The primary purposes of hangers include providing structural support for suspended building systems to prevent sagging and failure, maintaining proper alignment and slope for pipes and ducts, accommodating thermal expansion and contraction of system components, controlling vibration and noise transmission from mechanical systems, enabling access for maintenance and system modifications, ensuring compliance with building codes and industry standards, distributing loads properly to building structural elements, and protecting system components from damage due to building movement or settling.

Types of hangers are classified by their application, design, and load-bearing characteristics, including pipe hangers for plumbing and process piping systems, duct hangers for HVAC ductwork and ventilation systems, conduit hangers for electrical systems and cable management, structural hangers for supporting beams and building components, seismic hangers designed to resist earthquake forces, vibration isolation hangers that reduce noise and vibration transmission, adjustable hangers that allow for system modifications and alignment, and specialty hangers for unique applications or extreme conditions.

FAQs

  • What is a hanger in construction?

    A hanger is a structural support device that suspends or supports pipes, ducts, conduit, and other building systems from ceilings, walls, or structural members while accommodating movement and vibration.

  • What are the main types of hangers?

    Main types include pipe hangers for plumbing systems, duct hangers for HVAC, conduit hangers for electrical systems, structural hangers for building components, seismic hangers for earthquake resistance, and vibration isolation hangers for noise control.

  • How do you determine proper hanger spacing?

    Hanger spacing depends on system type and size: pipes are typically supported every 6–20 feet, ductwork every 8–12 feet, and conduit per electrical code requirements, all based on load capacity and deflection limits.

  • What materials are hangers made from?

    Common materials include carbon steel for general use, galvanized steel for corrosion resistance, stainless steel for harsh environments, aluminum for lightweight applications, and specialty alloys for extreme conditions.

  • Why are seismic hangers important?

    Seismic hangers resist earthquake forces through specialized design and lateral bracing, preventing system damage and maintaining building safety in seismic zones as required by building codes.

  • How do vibration isolation hangers work?

    Vibration isolation hangers use rubber, neoprene, or spring elements to reduce the transmission of mechanical vibration and noise from equipment to the building structure, improving comfort and performance.

  • What are common hanger installation problems?

    Common problems include inadequate support causing sagging, improper spacing leading to overstress, corrosion reducing capacity, poor accommodation of thermal movement, and installation errors resulting in code violations.

Fun Fact

Fun Fact: The first standardized pipe hangers were developed in the 1920s for steam heating systems in skyscrapers, where improperly supported pipes would sag and create “water hammer” that sounded like someone banging on the pipes with a hammer! Modern hangers can support loads exceeding 10,000 pounds while still allowing for several inches of thermal expansion. The largest hanger installation ever was in the Alaska Pipeline, which used over 78,000 specialized hangers to support the 800-mile pipeline across varying terrain and extreme temperature changes!

CSI Code

05 05 00

NAHB Code

550