Efficient Pipe Support Systems for HVAC: Ensuring Stability and Functionality

When it comes to the efficient functioning of Heating, Ventilation, and Air Conditioning (HVAC) systems, one crucial yet often overlooked aspect is the piping support system. This article delves into the significance of proper piping support, the different types of supports, and the guidelines to ensure a stable and well-functioning HVAC system.

Work Included in Piping Support System in HVAC

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HVAC systems are complex networks of pipes that carry various fluids and gases to provide heating, cooling, and ventilation. To ensure the integrity and longevity of these systems, an effective piping support system is essential. This system includes hangers, structure attachments, submittals, product data, and shop drawings. Each component plays a vital role in supporting and maintaining the pipes' stability.

Types of Pipe Supports

The choice of pipe support types depends on the type of piping and the services they carry. Different types of supports are designated for various pipe sizes and services:

• Chilled Water: Clevis Hangers (Single)
• Hot Water (12 mm to 150 mm): Trapeze (Multiple)
• Hot Water (more than 150 mm): Roller or Spring
• Steam (12 mm to 15 mm): Clamp
• Steam (more than 65 mm): Roller or Spring
• Drain (6 mm and up): Clamp
• Compressed Air (6 mm and up): Clamp
• Water (Drinking Condensing): Saddle, clamp, or as approved

Supporting Buried Pipes

Buried pipes require careful installation to adhere to manufacturer recommendations and local codes. Proper installation prevents damage to pipes and ensures their longevity and functionality.

Vertical Riser Support

Vertical risers pass through each floor slab and require additional support to prevent sagging. Different services demand specific support methods, such as springs for chilled water and medical gases, cradles for cold water pipes, and rubber pads for drain pipes.

Support Height for Vertical Risers

The height of the riser dictates the type of support required. Various support methods are assigned based on the height and pipe size:

• Under 20' (6" to 8"): Concrete block
• Under 20' (Up to 10"): Hanger at elbow
• Under 20' (10" and up): Foot elbow
• Over 20' (Up to 1½"): Hanger at elbow
• Over 20' (1¾" to 6"): Support or concrete block
• Over 20' (7" and up): Foot elbow

Proper Material Compatibility

When pipes and clamps are made of different materials, approved gaskets must be used between them to prevent corrosion and maintain integrity.

Insulated Pipe Support

Supporting insulated pipes requires extra care to prevent damage to the insulation. Ensuring uninterrupted vapor seals around supports maintains the insulation's efficiency.

Execution and Installation

Horizontal piping support follows specific spacing and rod size guidelines based on pipe size. These guidelines ensure proper weight distribution and support:

• Pipe Size 25mm and smaller: Maximum Hanger Spacing 1800mm, Minimum Rod Size 10mm
• Pipe Size 32mm to 50mm: Maximum Hanger Spacing 2700mm, Minimum Rod Size 10mm
• Pipe Size 65mm to 80mm: Maximum Hanger Spacing 3000mm, Minimum Rod Size 15mm
• Pipe Size 100mm to 125mm: Maximum Hanger Spacing 3600mm, Minimum Rod Size 15mm
• Pipe Size 150mm: Maximum Hanger Spacing 3600mm, Minimum Rod Size 10mm

Key Considerations

1. Localized Expansion: Anchors prevent undue strain on piping and branches, while localized expansion loops accommodate temperature-related expansion and contraction.
2. Supplementary Steel: Large and heavy pipes require supplementary steel for support, especially in concrete construction.
3. Copper Tubing Support: Specific hangers designed for copper tubing prevent damage and maintain support.

Conclusion

A meticulously designed and thoughtfully implemented piping support system is the backbone of any efficient HVAC system. Adhering to industry standards and guidelines ensures the stability, safety, and long-term functionality of HVAC systems. HVAC professionals play a pivotal role in creating systems that provide comfort and climate control in various buildings and spaces.