---
title: How To Shield Irrigation Systems From Water Hammer
description: There's no silver bullet solution to totally prevent water hammer, but you can reduce the chances of it happening.
image: https://ewingirrigation-20200354.hs-sites.com/hubfs/Imported_Blog_Media/PRIMG-Prod-Backflow-Device-e1554501876667-Mar-02-2022-04-50-13-28-PM.jpg
---

### Resources

[![Ewing Outdoor Supply Logo V 4 Color](https://ewingirrigation-20200354.hs-sites.com/hubfs/Ewing%20Outdoor%20Supply%20Logo%20V%204%20Color.png) ](https://www.ewingoutdoorsupply.com/)

[![Login/Register](https://no-cache.hubspot.com/cta/default/20200354/5d045e9a-574a-4a92-a8cc-1ce2a4352784.png)](https://cta-redirect.hubspot.com/cta/redirect/20200354/5d045e9a-574a-4a92-a8cc-1ce2a4352784)

0

You have no items in your shopping cart

### Shop Products

Shop Products

# Irrigation & Landscape supply Blog

# How To Shield Irrigation Systems From Water Hammer

[Ewing Outdoor Supply](https://ewingirrigation-20200354.hs-sites.com/author/ewing-outdoor-supply) on June 29, 2016

Share

- [**](https://twitter.com/share?source=https://ewingirrigation-20200354.hs-sites.com/how-to-shield-irrigation-systems-from-water-hammer&text=How%20To%20Shield%20Irrigation%20Systems%20From%20Water%20Hammer%20-%20https://ewingirrigation-20200354.hs-sites.com/how-to-shield-irrigation-systems-from-water-hammer)
- [** ](https://www.facebook.com/sharer/sharer.php?u=https://ewingirrigation-20200354.hs-sites.com/how-to-shield-irrigation-systems-from-water-hammer&title=How%20To%20Shield%20Irrigation%20Systems%20From%20Water%20Hammer&picture=https://20200354.fs1.hubspotusercontent-na1.net/hubfs/20200354/Imported_Blog_Media/PRIMG-Prod-Backflow-Device-e1554501876667-Mar-02-2022-04-50-13-28-PM.jpg&description=There's%20no%20silver%20bullet%20solution%20to%20totally%20prevent%20water%20hammer,%20but%20you%20can%20reduce%20the%20chances%20of%20it%20happening.)
- [**](http://www.linkedin.com/shareArticle?mini=true&url=https://ewingirrigation-20200354.hs-sites.com/how-to-shield-irrigation-systems-from-water-hammer&title=How%20To%20Shield%20Irrigation%20Systems%20From%20Water%20Hammer&summary=There's%20no%20silver%20bullet%20solution%20to%20totally%20prevent%20water%20hammer,%20but%20you%20can%20reduce%20the%20chances%20of%20it%20happening.)
- [**](https://ewingirrigation-20200354.hs-sites.com/how-to-shield-irrigation-systems-from-water-hammer)

![](https://ewingirrigation-20200354.hs-sites.com/hubfs/Imported_Blog_Media/PRIMG-Prod-Backflow-Device-e1554501876667-Mar-02-2022-04-50-13-28-PM.jpg)

Water hammer. Surge. Dry line shock. These sound like spells cast by a wizard in a video game. But they’re actually names for a real event that can harm the irrigation systems you manage.

There is no silver bullet solution to totally prevent water hammer, but you can reduce the chances of it happening, and also mitigate its impact should water hammer appear in your system.

**What is water hammer?  
**Water hammer can occur when you are opening or closing valves, or starting or stopping pumps. It’s the shock wave created by a surge of water, moving in empty pipes at a velocity of up to 5 feet per second, that stops abruptly inside the system. It’s like a bus driving at full speed into a wall.

The shock wave moves back through the system, rattling pipes as the energy in the water transfers to the pipes themselves, seeking relief. It will reach the valve with a loud bang or thump—hence the name water hammer.

**Why worry about water hammer?  
**With the shock wave is an enormous spike in water pressure, or surge. This surge lasts less than a second, but it can do lasting harm to a system as each occurrence wears out pipe and loosens fittings. This will eventually cause leaks, and cost you time and money in repairs that could have been prevented.

**What can you do about water hammer?  
**There is no magic cure for water hammer. But you can take steps to reduce its impact, and Ewing can help. Here’s how…

**Clear the air to prevent water hammer from occurring  
**You can’t always stop air from entering the system. But you can carefully control how you expel the air from it to reduce dangerous velocities.

For example, when you turn on a system in the spring, first remove the furthest head on the line to allow air to bleed out. Then fill the pipes slowly with water from the main water valve to avoid trapping air.

Even the best-designed system can have air inside it. Air in the system can contribute to water hammer, as it can travel at a higher velocity than water. When the system is turned on, the water behind the air bubble will speed up, the air will run out of the system, and the result will be water hammer.

When a section valve is opened and the water travels unrestricted in the empty lateral pipes, it creates a shock. The air in the pipe will be quickly voided through the heads, causing those abnormal velocities that damage pipes, heads and component parts. This is called dry line (or dry pipe) shock.

Protect your system with **[air release valves](https://www.ewingirrigation.com/products/valves/valves-specialty/valves-air-release)**. Air release valves open to release air when the system is turned off, and close up when water runs through the pipes. Install these valves on the high points of the system, where air collects, so air can bleed out through the valves and not blow out through the heads.

Air release valves are among the variety of specialty valves that your **[local Ewing store](https://www.ewingirrigation.com/locations)** offers. Ask about options from **Jain**, **Landscape Products** and **Christy’s**.

![Watts offers this water hammer arrestor.](https://ewingirrigation-20200354.hs-sites.com/hs-fs/hubfs/Imported_Blog_Media/PRIMG-IR-Water-Hammer-Arrestor-81x300-2.jpg?width=81&height=300&name=PRIMG-IR-Water-Hammer-Arrestor-81x300-2.jpg) A water hammer arrestor from Watts.

**Cushion the blow when water hammer does occur  
**You have another option when it comes to diminishing the harmful effects of water hammer. Go to your local Ewing store and ask about the **[water hammer arrestor](https://www.ewingirrigation.com/catalogsearch/result/?manufacturer=61&q=arrestor)** from Watts.

You can swiftly and easily install a water hammer arrestor in new or existing systems using a standard [pipe tee](https://www.ewingirrigation.com/catalogsearch/result/?q=tee). This device incorporates a pre-charged, permanent sealed air pocket to absorb potential shocks. Its piston is the only moving part, and it can recharge the air pocket.

If you’re not cautious about how you turn on a system, then the possibility of water hammer will still exist—the change in velocity happens too quickly for any prevention to start in time—but you can neutralize the shock with an arrestor.

**Don’t get hammered  
**The surge in water pressure occurs in a matter of milliseconds, so it’s always too late to stop it once it’s begun. But by using caution when turning on a system, you can avoid a water hammer event. And by installing a water hammer arrestor and air release valves, you can defuse water hammer’s damaging effects and avoid costly (and preventable) repairs.

Your **[local Ewing store](https://www.ewingirrigation.com/locations)** can share more maintenance solutions with you. Stop by today to learn more about how you can better protect and maintain your irrigation systems.

 TAGS: [Landscape Maintenance](https://ewingirrigation-20200354.hs-sites.com/tag/landscape-maintenance), [Water Efficiency](https://ewingirrigation-20200354.hs-sites.com/tag/water-efficiency), [Irrigation](https://ewingirrigation-20200354.hs-sites.com/tag/irrigation), [Water Conservation](https://ewingirrigation-20200354.hs-sites.com/tag/water-conservation), [Pipe](https://ewingirrigation-20200354.hs-sites.com/tag/pipe)

### Looking for More?

### Topics

- [Ewing News (194)](https://ewingirrigation-20200354.hs-sites.com/tag/ewing-news)
- [Irrigation (191)](https://ewingirrigation-20200354.hs-sites.com/tag/irrigation)
- [News Release (180)](https://ewingirrigation-20200354.hs-sites.com/tag/news-release)
- [Business Tips (134)](https://ewingirrigation-20200354.hs-sites.com/tag/business-tips)
- [Turf (100)](https://ewingirrigation-20200354.hs-sites.com/tag/turf)
- [Water Efficiency (96)](https://ewingirrigation-20200354.hs-sites.com/tag/water-efficiency)
- [Smart Irrigation (85)](https://ewingirrigation-20200354.hs-sites.com/tag/smart-irrigation)
- [Business (79)](https://ewingirrigation-20200354.hs-sites.com/tag/business)
- [Landscape Maintenance (71)](https://ewingirrigation-20200354.hs-sites.com/tag/landscape-maintenance)
- [Outdoor Living (69)](https://ewingirrigation-20200354.hs-sites.com/tag/outdoor-living)
- [Landscape Lighting (61)](https://ewingirrigation-20200354.hs-sites.com/tag/landscape-lighting)
- [Water Conservation (58)](https://ewingirrigation-20200354.hs-sites.com/tag/water-conservation)
- [Athletic Fields (52)](https://ewingirrigation-20200354.hs-sites.com/tag/athletic-fields)
- [Sports Fields (52)](https://ewingirrigation-20200354.hs-sites.com/tag/sports-fields)
- [Golf (50)](https://ewingirrigation-20200354.hs-sites.com/tag/golf)
- [Lawn Care (50)](https://ewingirrigation-20200354.hs-sites.com/tag/lawn-care)
- [Hardscape (47)](https://ewingirrigation-20200354.hs-sites.com/tag/hardscape)
- [Sustainable Solutions (46)](https://ewingirrigation-20200354.hs-sites.com/tag/sustainable-solutions)
- [Ewing Education (45)](https://ewingirrigation-20200354.hs-sites.com/tag/ewing-education)
- [Green Industry (41)](https://ewingirrigation-20200354.hs-sites.com/tag/green-industry)

## Related

[ Managing Localized Dry Spot with Smarter Moisture Solutions ](https://ewingirrigation-20200354.hs-sites.com/managing-localized-dry-spot-with-smarter-moisturesolutions)

By [Kevin Lewis](https://ewingirrigation-20200354.hs-sites.com/author/kevin-lewis) On July 7, 2026

[ Managing Sports Fields with Smart Irrigation Technology ](https://ewingirrigation-20200354.hs-sites.com/managing-sports-fields-with-smart-irrigation-technology)

By [Ian Yarian](https://ewingirrigation-20200354.hs-sites.com/author/ian-yarian) On July 2, 2026

[ Smart Irrigation Starts with the Controller ](https://ewingirrigation-20200354.hs-sites.com/smart-irrigation-starts-with-the-controller)

By [Greg Williams](https://ewingirrigation-20200354.hs-sites.com/author/greg-williams) On June 30, 2026

## Related

## [Managing Sports Fields with Smart Irrigation Technology](https://ewingirrigation-20200354.hs-sites.com/managing-sports-fields-with-smart-irrigation-technology)

By [Ian Yarian](https://ewingirrigation-20200354.hs-sites.com/author/ian-yarian) On July 2, 2026

## [Smart Irrigation Starts with the Controller](https://ewingirrigation-20200354.hs-sites.com/smart-irrigation-starts-with-the-controller)

By [Greg Williams](https://ewingirrigation-20200354.hs-sites.com/author/greg-williams) On June 30, 2026

## [Reducing Water Waste with Smart Irrigation Opportunities](https://ewingirrigation-20200354.hs-sites.com/reducing-water-waste-with-smart-irrigation-opportunities)

By [Ewing Outdoor Supply](https://ewingirrigation-20200354.hs-sites.com/author/ewing-outdoor-supply) On June 30, 2026

### Subscribe via Email

Enter your email to get special offers, exclusive discounts, and more!

[![Subscribe](https://no-cache.hubspot.com/cta/default/20200354/88ccb08c-3300-4e9a-b7b8-69d093daaa55.png)](https://cta-redirect.hubspot.com/cta/redirect/20200354/88ccb08c-3300-4e9a-b7b8-69d093daaa55)

### Company

### Resources

### Help

### Sign up for our Newsletter

Enter your email to get special offers, exclusive discounts, and more!

[![Sign up](https://no-cache.hubspot.com/cta/default/20200354/c28dc24c-bf78-40c0-817f-c1e966c7b2b9.png)](https://cta-redirect.hubspot.com/cta/redirect/20200354/c28dc24c-bf78-40c0-817f-c1e966c7b2b9)

- [**](https://www.facebook.com/EwingOutdoorSupply)
- [**](https://twitter.com/EwingOutdoor)
- [**](https://www.instagram.com/ewingoutdoor/)
- [**](https://www.linkedin.com/company/ewingoutdoorsupply/)
- [**](https://www.youtube.com/@ewingoutdoorsupply)

© 2025 - Ewing Irrigation Products, Inc. All Rights Reserved.