Water Well Journal
Issue link: http://read.dmtmag.com/i/451364
Y WH C T GE Y EXPERIENCE ABILITY D ? CERTIFIED KN EX gro national OSED CLD CL CERTIF VC CV C OWLEDGE XPERIENCE association water ound OOP DRILLER L VERTICAL IED ® 800 551.7379 • www. protecting the resour Advance your career, .NGWA.org/Certificati rce. , your self-esteem, and on • 614 898.7791 d your paycheck while e Hydrogen sulfide is considered a corrosive agent and a potential hazard to metals in a piping system as well as the heat exchangers in a geothermal system. Cupronickel heat exchangers may be ordered as a factory option for added resistance to hydrogen sulfide and saline water sources. Caution Water containing hydrogen sulfide should not be dis- charged to a lake, a stream, or pond unless fully aerated to precipitate the hydrogen sulfide. Failure to aerate this stinky water will cause it to scavenge the available oxygen to satisfy its oxidation process and can suffocate aquatic life in the process. If used as an open source to supply a geothermal system, water supplies with heavy iron precipitates may require main- tenance to clean strainers and air-purge piping on a biannual basis. Most customers would prefer not to have the added maintenance burden. Well pumps exposed to iron deposition are also short-lived and will likely lose capacity and need to be replaced as fre- quently as every five years. If initial survey information shows there is a history of heavy iron deposits in filters or you happen to find the interior of a toilet flush tank with heavy slime growing on the tank walls, this is good cause to avoid an open loop installation and advise the customer a closed loop installation would be their best long-term option. This concludes part one of this two-part series. Watch for part two in the April issue of Water Well Journal when I will discuss the dynamics of pump testing for a geothermal instal- lation, measuring pressure tank volume vs. pump sizing, and finish with a discussion on water discharge methods to help minimize iron precipitates in discharge piping. WWJ DACUM Codes To help meet your professional needs, this article covers skills and competencies found in DACUM charts for drillers and pump installers. GO refers to the geothermal chart. The letter and number immediately following is the skill on the chart covered by the article. This article covers: GOA-2, GOA-4, GOA-5, GOB-1, GOB-2, GOE-6, GOG-8, GOG-9, GOI-4 More information on DACUM and the charts are available at www.NGWA.org. Jeff Persons, CGD, is the president of Geo Source One in Dublin, Ohio, and has more than 35 years of experience in the geothermal heat pump and hydronic industry. His company specializes in the design and installation of custom geothermal and radiant heating systems. He is the author of the book Understanding Geothermal Systems and can be reached at persons.jeff@yahoo.com. WWJ February 2015 17 Twitter @WaterWellJournl