A Faster Path to Safe Drinking Water

Plumbers can look at several different materials to make drinking water safer by removing lead

A Faster Path to Safe Drinking Water

  A RIDGID press tool is used to install a brass lead-free fitting.

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Lead is a toxic metal that negatively affects the human brain and central nervous system and can result in high blood pressure and decreased kidney function. In children and infants, the effects can be even worse and may include learning problems, hearing problems, anemia, reduced IQ and slowed growth.

Children and adults alike can be exposed to the dangers of lead through a variety of means, including paint, dust, air, food and drinking water — or a combination of all of these. And while a range of environmental regulations has removed it from many common substances, such as gasoline and paint, the Environmental Protection Agency estimates that, depending on where people live, drinking water can account for 20% or more of a person’s total lead exposure.

To address this challenge, new federal regulations were introduced in the past decade with the adoption of the U.S. federal Reduction of Lead in Drinking Water Act that amended Section 1417 of the Safe Drinking Water Act. It established that not more than a weighted average of 0.25% lead be present when used with respect to the wetted surfaces of pipes, pipe fittings, plumbing fittings and fixtures and not more than 0.2% lead content present in solder and flux.

As of 2015, it is estimated that 18 million Americans are served by water systems that violate the EPA’s Lead and Copper Rule. The most common source of lead in drinking water occurs when water with high acidity or low mineral content corrodes pipes and fixtures containing lead.

Regulations do allow the “grandfathered” use of noncompliant materials in existing installations, so compliance is required only for new installations or older sites retrofitted with new equipment. Commercial and municipal water companies, as well as companies building and installing various kinds of water automation systems in commercial, institutional and residential facilities, need to consider the materials used to create the components that build the water transport and handling applications they are creating.

The key challenge is this: to make technology choices that help reduce the prevalence of lead-containing materials in these systems. This impacts not only the piping, but also valves for almost any kind of water conditioning and water purification equipment.

THE LEAD-FREE CHALLENGE

Under the law, lead-free is a “cumulative” concept — some parts can be over the 0.25% number, and some can be under it. Specifiers and buyers can “add up” the lead content of all wetted components to get an average product percentage that comes in either at or under the 0.25% lead content requirement. This total wetted surface area calculation can provide a path to compliance, but it involves a series of complex calculations.

To meet regulations, the weighted average lead content of a pipe, fitting, fixture or system is derived from the following calculation:

Multiply the percentage of lead in each wetted component by the ratio of the wetted surface area of that component against the total wetted surface area of the entire product. That will provide the weighted percentage of lead of that component. If the lead content of a material is given as a range, then the highest number in that range must be used.

Add together the weighted percentage of lead in each wetted component.

This resulting number is used to determine the weighted average lead content of the total product or system, which can then be used to determine compliance.

For OEMs or equipment builders who have direct access to suppliers, this calculation is possible if the surface area and lead content of all wetted surfaces can be obtained. However, in field installations, where full component information is not readily available to the inspector, he or she is much less likely to take the “system” approach and is more likely to look at each individual component. In these instances, clear marking of lead-free compliance (i.e., an “LF” stamp or embossing mark) eliminates any questions of compliance with the new law.

MORE CONVENIENT, MORE PRACTICAL SOLUTIONS

Products with complex geometries can lead to tricky calculations in an attempt to meet the 0.25% or less lead content requirement. When faced with a tight deadline, a simpler, safer lead-free solution is often more practical.

A range of lead-free solutions are now available to upgrade existing water systems or for use in new construction, including stainless steel, engineered composites and lead-free brass. Many of these products are being designed as drop-in replacements for traditional brass valves and offer a variety of benefits.

Plastic composites

Some companies now offer engineered plastic products that meet the new, stricter regulations. OEMs who choose valves made of engineered plastics don’t need to be concerned about the wetted average surface calculations necessary with traditional brass valves.

Plastic composite components are generally less expensive; they are also often considered less-reliable, easily degraded products for long-term use. However, leading manufacturers are engineering a new generation of valves with composite or thermoplastic materials, fabricated using strict quality processes and improved designs and materials, making them both a cost-effective and reliable option for a range of applications.

Stainless steel

Most stainless steel valves are inherently lead-free and provide the durable, corrosion-resistant performance called for in many water system applications. As an extremely hard material, stainless steel is a more difficult metal to machine, particularly when fabricating valves and other fixtures with complex geometries — thus making them more expensive. In addition, there may be local building and plumbing codes that require stainless steel components in certain applications.

Lead-free brass

It’s important to be aware that many common, more traditional brass products also contain lead, along with small amounts of other materials. Lead helps soften the brass alloy, making it easier and less costly to machine. However, this means that common brass valves and other plumbing fixtures have lead content ranging from 1.5% to 2.5%. So, while a system designer or specifier may assume they are reducing the lead content in the wetted path, that reduction may not be as high as intended — and may become problematic when subjected to a field inspection.

Specially formulated “lead-free” brass alloys, whose lead content is small enough to fall below the mandated limit of 0.25%, are now available and allow for the creation of complex products like valves that were formerly too difficult to manufacture.

Choosing the right product can help meet safe drinking water requirements and reduce inspection delays — both with the EPA for water safety and UL/CSA for NEC compliance.

IT’S EASIER THAN EVER TO GET THE LEAD OUT

Investing in lead-free from the beginning versus trying to be “just good enough” is often the smartest — and fastest — solution. Using 100% lead-free components can eliminate complex calculations and reduce inspection delays right from the start.

A wider variety of product options to meet varying needs and allow for more creative solutions is also helping make the lead-free transition easier while reducing design limitations. Look for fitting options like press fit or NPT end connections for increased versatility, improved efficiency and reduced labor costs.

Both press fit and NPT have proven to be popular with contractors, and many lead-free options are now available with these connection options. For projects like upgrading or replacing legacy water systems, where a substantial cost is the amount of labor to dig up and replace the infrastructure, companies can now choose lead-free valves and other components to help keep costs manageable with less labor-intensive connections.

Products like lead-free brass valves provide a useful and cost-effective tool in the incremental process of providing lead-free water. When updating a system to “lead-free” status, or in the development of a new system, you can either calculate everything or just use lead-free components.  

Michael Brendel is the product marketing manager for Emerson Automation Solutions.



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