(Newsletter, Nov., 2023)

As we end the month of November, prioritizing workplace safety remains a top concern. In this newsletter, we focus on developing a robust inspection and maintenance plan for tepid water systems and safety shower/eye wash stations in a typical plant site, aligning with ANSI Z358.1 standards. We will also look at tepid water design insights to consider for any 2024 projects to upgrade or replace systems.

Understanding ANSI Z358.1 Standards

The ANSI Z358.1 standard provides guidelines for the proper design, performance, installation, testing, and maintenance of emergency eyewash and shower equipment. Adhering to these standards is crucial to ensure the effectiveness of safety measures in case of exposure to hazardous substances.

Frequency of Testing

Regular testing is essential to confirm the readiness of safety equipment. Here are general recommendations:

  • Weekly Testing: Conduct a quick functional test to ensure proper activation and water flow.
  • Monthly Testing: A more comprehensive inspection, including checking for any leaks, ensuring proper water temperature, and confirming clear pathways to the safety stations.
  • Annual Inspection: A thorough examination, cleaning, and potential replacement of parts as needed.

Checklist for Testing and Maintenance

Weekly Testing:

Activation Test:

  • Ensure the eyewash and shower units activate promptly.
  • Confirm proper water flow and coverage.

Monthly Testing:

Temperature Check:

  • Verify that tepid water (60–100°F or 16–38°C) is consistently provided.
  • Adjust water heaters if necessary.

Clear Pathways:

  • Confirm unobstructed access to safety stations.
  • Remove any stored items that could impede emergency response.

Annual Inspection:

Nozzle and Spray Pattern Examination:

  • Inspect nozzles for debris and mineral deposits.
  • Confirm the spray pattern is adequate for effective coverage.

 Piping and Valve Inspection:

  • Check for leaks in piping and valves.
  • Lubricate moving parts as needed.

Water Heater / Tank Maintenance:

  • Flush water heaters & tanks to remove sediment buildup.
  • Inspect and clean the heating elements.

Signage and Lighting:

  • Ensure clear and visible signage indicating the location of safety stations.
  • Confirm proper lighting for night-time visibility.


  • Maintain detailed records of all inspections, tests, and maintenance activities.
  • Document any corrective actions taken.

Remember, the safety of employees is paramount. Consistent testing and maintenance not only comply with regulations but also contribute to a safer work environment.

Tepid Water System Design Considerations

ANSI Z358.1 Standards Overview


The ANSI Z358.1 standards are designed to ensure that emergency eyewash and shower equipment are readily available and effectively function to minimize the impact of chemical exposures. Adherence to these standards is crucial for maintaining a safe working environment.

 Key Components:

  • Temperature Requirements: ANSI Z358.1 specifies tepid water, defined as 60–100°F (16–38°C), to prevent additional harm to the affected individual.
  • Water Flow Requirements:
  • Eyewash stations must provide a minimum flow rate of 0.4 gallons per minute for a minimum of 15 minutes.
  • Safety showers must deliver a flow rate of 20 gallons per minute for a minimum of 15 minutes.

Tepid Water System Design Principles

Tepid Water Skid

Importance of Tepid Water:

In emergency situations, tepid water plays a crucial role in preventing thermal shock to the exposed person. It ensures a comfortable temperature for extended rinsing, promoting compliance with the recommended rinsing duration.

Integration with Plumbing Systems:

Designing tepid water systems involves integrating safety stations with the existing plumbing infrastructure. This ensures a reliable and consistent water supply, meeting the ANSI Z358.1 temperature and flow requirements.


  • Water Temperature, Pressure, and Volume: Engineers must consider these factors to maintain an optimal and consistent tepid water supply for emergency response

Safety Shower/Eye Wash Station Requirements

Eyewash Stations:

  • Must deliver a gentle, continuous stream to both eyes.
  • Should be located within a 10-second walking distance from potential hazard areas.

Safety Showers:

  • Must provide a wide, dispersed spray pattern covering the entire body.
  • Should be located within a 10-second walking distance from potential hazard areas.

Activation and Accessibility:

Ensure that both eyewash stations and safety showers activate promptly and are easily accessible. Clear signage and unobstructed pathways are essential for quick response.

Key Components and Materials


Select corrosion-resistant materials to ensure the durability and longevity of safety station components. Stainless steel and corrosion-resistant plastics are commonly used.

Thermostatic Mixing Valves:

Incorporate thermostatic mixing valves to control water temperature and prevent scalding or chilling, maintaining the required tepid water temperature.

Pressure-Regulating Valves:

Include pressure-regulating valves to maintain consistent water pressure, ensuring the reliability of safety showers and eyewash stations.

Design Considerations


Strategically place safety stations near areas where potential hazards exist. Consider the layout of the facility and ensure quick and easy access to these emergency response points.

Accessibility and Signage:

Install clear and visible signage indicating the location of safety stations. Ensure that pathways are free from obstacles, allowing for swift and unobstructed access during emergencies.

Ambient Temperature:

For outdoor installations, consider ambient temperature variations. Insulate and protect safety stations to prevent freezing in colder climates or overheating in warmer environments.

These additional details provide a comprehensive overview of ANSI Z358.1 standards, tepid water system design principles, safety station requirements, key components, and design considerations for your newsletter.

If you have any questions or need help with your next tepid water skid package, please reach out and we will be happy to assist.

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