ASHRAE 188P and the effects on steam process

With a new standard under review, the HVAC industry prepares to adjust the new processes of preventing Legionellosis within building water systems.

09/12/2013


With the outbreak in the past few years of Legionella, the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) has reviewed the previous guidelines developed and collaborated with industry scientific and medical communities to develop a more comprehensive focused approach to help businesses mitigate the risks of infection.

The new standard, ASHRAE Standard 188P: Prevention of Legionellosis Associated with Building Water Systems, is still in “preliminary” format (thus the “P” notation) and is under public review for a possible release by the middle of 2013.

With the medical and scientific communities involved, details of the growth, methods of infection, and parameters to remediate the disease have provided a better insight to how the HVAC industry can adjust the processes with end users and test it to better remediate any findings at their facility.

While ASHRAE 188P does not define specific HVAC processes to change, they do list typical areas of possible contamination and remediation methods. Those areas of possible contamination can include:

  • Cooling towers
  • Evaporative condensers
  • Domestic hot water systems operating below 104 F supplied with water taps temperature of less than 122 F
  • Humidifier systems
  • Decorative fountains
  • Spas and whirlpools
  • Dental water lines
  • Any stagnant water systems

As you will note, both hot water systems and cold water systems are affected (80% and 20%, respectively). The standard focuses on the domestic hot water manufacturing and distribution systems so it will allow remediation and control of the disease.

The standard recommends storage and distribution of domestic hot water of 140 F and not less than 122 F at the point of use. Eliminate dead lead when possible, allow recirculation pumps to run continuously, and key to the remediation by providing a “Super Heat and Flush” of the distribution legs.

The “Super Heat and Flush” is of major discussion since it will require a supply temperature of 160 to 170 F for a minimum of 30 minutes as to effectively “kill” the disease in the system. These temperatures may cause damage to gaskets, water lines, valves or worse, scalding of individuals if not managed by the facility. Design and implementation of this flush is still being considered and may change as needed by standard or local codes.

ASHRAE 188P does provide the implementer methods and parameters to help remediate the disease as well as develop a plan to provide continuous remediation of the disease. The outlined plans include a water system treatment management plan (WSTMP) and a hazard analysis and critical control points plan (HACCPP). With these plans in place and working in conjunction with HVAC operational parameters, it is the opinion of the ASHRAE committee that the disease will be remediated and eliminated from active growth.

The ASHRAE standard also mentioned other processes that can be used and implemented to help control the spread or eliminate the growth of the disease. Each has recognized pros and cons and should be viewed and implemented how the local jurisdiction and client will find acceptable to their customers. The processes include hyper-halogenation, silver-copper ionization, and ultraviolet light.

While the implementation of any of these guidelines working together can control and mitigate the spread of the disease, it is still a strong requirement that the local facility personnel actively involved in the periodical testing of the water systems and ensure the implemented control processes and functioning as designed, at required set points and maintained.

Ray Prosise is the government business development manager at Spirax Sarco. Content provided by Spirax Sarco, originally published in Steam News Magazine.



No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
2016 Product of the Year; Diagnose bearing failures; Asset performance management; Testing dust collector performance measures
Safety for 18 years, warehouse maintenance tips, Ethernet and the IIoT, GAMS 2016 recap
2016 Engineering Leaders Under 40; Future vision: Where is manufacturing headed?; Electrical distribution, redefined
SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
Safety at every angle, Big Data's impact on operations, bridging the skills gap
The digital oilfield: Utilizing Big Data can yield big savings; Virtualization a real solution; Tracking SIS performance
Applying network redundancy; Overcoming loop tuning challenges; PID control and networks
Driving motor efficiency; Preventing arc flash in mission critical facilities; Integrating alternative power and existing electrical systems
Package boilers; Natural gas infrared heating; Thermal treasure; Standby generation; Natural gas supports green efforts

Annual Salary Survey

Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.

There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.

But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.

Read more: 2015 Salary Survey

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
This article collection contains several articles on the vital role of plant safety and offers advice on best practices.
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.
This article collection contains several articles on strategic maintenance and understanding all the parts of your plant.
click me