How Properly Designed Is Your Compressed Air System? — Selecting the Right Piping Network (Part 4)

If compressed air is the heartbeat of industrial production, the piping network is the vascular system that distributes it reliably to every point of use. Despite its critical importance, piping is often underestimated and frequently becomes a target for budget cuts during system upgrades or new installations.

In reality, the choice of piping material and the way the network is designed have a direct impact on pressure stability, air quality, leakage levels, and overall energy efficiency. This article highlights key considerations when selecting piping materials, the principles of proper sizing, and essential installation practices to ensure high performance and reliability across the entire compressed air system.

Understanding Pressure Drop

Pressure drop is the loss of pressure as compressed air travels from the compressor to the end user. Although some drop is inevitable, a well-engineered system should limit it to no more than 3% from the compressor room outlet (including dryers and filters) to the most remote point in the network.

Excessive pressure drop:

• reduces performance,
• increases energy consumption,
• forces the compressor to operate at higher pressures,
• shortens equipment life.

To put this into perspective: an increase of just 0.5 bar in operating pressure results in approximately 3.5% higher energy usage. Since compressed air is one of the most expensive utilities in manufacturing, even modest improvements in pressure drop can generate meaningful savings.

When Is It Time to Upgrade Your Piping Network?

Just like any mechanical system, piping networks deteriorate over time. If issues remain unaddressed, they gradually lead to rising costs and reduced system stability. The following symptoms indicate that your system likely needs a thorough evaluation or redesign:

Warning signs

• High pressure drop — often caused by deposits, corrosion, or undersized piping.
• Elevated leakage rate — leaks account for up to 25% of compressed air losses in Europe.
• Visible corrosion — particularly common in older steel systems.
• Frequent filter clogging — a sign that pipe material is degrading internally.
• Air contamination — rust particles and debris endanger equipment and product quality.
• Outdated layout — long runs, dead ends, and multiple extensions reduce system stability.
• Undersized pipes — as production grows, old piping often becomes inadequate.
• Safety concerns — cracked, brittle, or non-approved materials (such as PVC) pose real risks.
• High energy bills without increased output.
• Recurring repairs signaling the system is nearing end-of-life.

The cost of a small leak

Based on 4,500 operating hours and an electricity cost of €0.15/kWh.

How to Determine the Correct Pipe Diameter

1. Define the required airflow

Begin by calculating total system demand, including peak consumption. Higher airflow requires larger pipe diameters to maintain performance.

2. Calculate total equivalent length

Total equivalent length includes:

• all straight pipe runs,
• elbows, tees, valves, and other fittings that increase resistance.

This value is used to correctly calculate pressure drop and choose an appropriate diameter.

3. Determine the acceptable pressure drop

Stable pressure at points of use often requires larger diameters.
Loop (ring-shaped) networks can reduce pressure drop by up to 50% compared to linear layouts.

4. Select the diameter using engineering tools

Sizing is completed using:

• pipeline sizing tables,
• engineering formulas,
• or specialized software.

At MAVA Industrial, we use dedicated calculation tools that determine the optimal pipe diameters while ensuring pressure drop stays within acceptable limits.

Key Design Principles

Regardless of the piping material, the following practices ensure high system efficiency:

• Size main distribution lines generously to minimize pressure losses.
• Use loop layouts wherever possible for balanced pressure distribution.
• Install vertical drain legs in low sections to remove condensate.
• Take air from the top of the main line to avoid moisture carryover.
• Install isolation valves to simplify maintenance and future modifications.
• Allow for future system expansions.
• Support piping according to manufacturer spacing guidelines.
• Provide expansion allowances for thermal changes.
• Properly seal all connections; modern aluminum systems with O-rings offer excellent leak tightness.
• Perform leak testing before commissioning.

Common Piping Materials: Pros and Cons

Why Aluminum Is the Best Modern Solution

Aluminum piping systems offer:

• minimal pressure drop thanks to smooth internal surfaces,
• resistance to corrosion and contamination,
• exceptional leak tightness,
• modularity and easy future expansion,
• fast installation with push-fit or compression fittings,
• long system life with minimal maintenance.

At MAVA Industrial, we provide advanced aluminum piping solutions with grip-ring compression fittings that ensure long-lasting, leak-free performance.

Conclusion

The piping network is a crucial component of any compressed air installation. When properly selected and correctly sized, it ensures:

• lower energy consumption,
• stable operating pressure,
• reduced wear on equipment,
• improved air quality,
• and long-term system reliability.

Investing in a modern, well-designed piping system is one of the most cost-effective improvements any facility can make.