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Chemical Storage

CH requires secondary containment on muriatic acid.

Acid should be stored away from alkaline material, oxidizing agents, and base metals.  Contact may cause hydrogen generation.

Dike storage areas should meet Federal, State and Local regulations.

Size of double wall tank sizes are (dimensions will vary based on manufacturer, below is based on Chemtainer):

  • 1,000 gallons:  74” D x 85” H
  • 500 gallons:  59” D x 71” H
  • 350 gallons:  52” D x 56” H
  • 200 gallons:  41” D x 52” H

If more than 500 gallons of liquid chlorine is to be used (typically only for large outdoor leisure pools), the sanitation area will need to be partitioned into two separate rooms if neither ventilation nor sprinkling of the space is accounted for in the design.  When the sanitation room is below an occupied space, the maximum storage amount is reduced by half and the same rules apply for doubling the quantity when this space is ventilated and/or sprinkled.

With spas it is sometimes necessary to dilute the acid because it is lowering the total alkalinity.  CH will then use a second vessel and pump it out with a peristaltic pump.  Water should always be added to acid in order to dilute to prevent chemical splash.  NEVER add acid to water (there is not a set ratio, but a good starting point is 4 parts water to 1 part acid).  CH does not recommend diluting because we don’t like the operators to handle acid.  If they do choose to dilute, OSHA standards require anyone handling muriatic acid to wear goggles, aprons, and gloves.

Fire rating of the chemical room doors:

  • Interior doors (occupied space on other side) – Yes and the rating should match that of the chemical room walls.
  • Stainless steel doors up to 90 minutes. 
  • Galvanized steel with epoxy paint – 3 hours. 
  • Exterior doors (with at least 5 ft to property line) – Not required.  These doors are typically louvered.

Table 3 - Expected quantities and types of chemical to be stored on site.

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***VERIFY WITH EXPECTED CHEMICAL USAGE TAB ON DESIGN DATA SPREADSHEET

  • Primary chemicals are those that are used in the day to day operation of the pool.  The quantities given are based on a one week delivery schedule and will vary depending upon the use bather load water area. 
  • Secondary chemicals are typically stored in small quantities and are for the adjustment of total alkalinity and pH balance.  It would be very unlikely that all of these chemicals would be on site at any specific time.
  • The segregation of alkaline and acidic chemicals is key to providing owners with the safety necessary too properly run and maintain an aquatic facility.     It is critical that the design team be cognizant of the implication surrounding the operational and logistic decisions that the owner must make in determining the size and orientation of the chemical storage rooms.   The amount of hazardous material that is allowed to be stored on site in unrated space is not enough to provide for the needs of most natatoriums.  By carefully considering the occupancy rating of the mechanical and chemical storage rooms, the design team can significantly reduce upfront construction cost.  The design team should provide the owner with a solution that allows for flexibility while allowing the updating and replacement of equipment over the lifetime of the building.  Outside access for chemical storage rooms may minimize critical review concerns by the fire department and code officials.

Table 4 - Maximum allowable exempted amounts of hazardous materials in controlled, unrated spaces.

EX IBC 2012  
  With fire suppression Without fire suppression
Class III Oxidizers 200lbs 200 lbs
Class IIOxidizers 500 lbs 250 lbs
Corrosive Material 1000 Gallons 500 Gallons
Toxic Material 1000 lbs1000 Gallons 500 lbs500 Gallons

Table 5

IBC – 2012
Chapter 3:  Use and Occupancy Classification
Section 307: High-Hazard Group H

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d.  Maximum allowable quantities shall be increased 100 percent in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1. Where Note e also applies, the increase for both notes shall be applied accumulatively.

e.  Maximum allowable quantities shall be increased 100 percent when stored in approved storage cabinets, day boxes, gas cabinets or exhausted enclosures or in listed safety cans in accordance with Section 5003.9.10 of the International Fire Code. Where Note d also applies, the increase for both notes shall be applied accumulatively.

k.  A maximum quantity of 200 pounds of solid or 20 gallons of liquid Class 3 oxidizers is allowed when such materials are necessary for maintenance purposes, operation, or sanitation of equipment. Storage containers and the manner of storage shall be approved.

d.  The aggregate quantity in use and storage shall not exceed the quantity listed for storage.

e.  Maximum allowable quantities shall be increased 100 percent in buildings equipped throughout with an approved automatic sprinkler system in accordance with Section 903.3.1.1. Where Note f also applies, the increase for both notes shall be applied accumulatively.

f.  Maximum allowable quantities shall be increased 100 percent when stored in approved storage cabinets, gas cabinets or exhausted enclosures as specified in the International Fire Code. Where Note e also applies, the increase for both notes shall be applied accumulatively.

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