Chair - Jeff Hebenstreit - UL12/4/2013

BackgroundPrevious presentation – Evaluation of gases to

Method E12/2/2009

Background• Utility contacted UL• Concern surrounding contaminants in chlorine• Provided a study suggesting a concentration

effect of Carbon Tetrachloride.

Concerns• A product could meet the requirements of

the standard, if prepared from a full cylinder, where it truly may be non-compliant.

• As product is used, compliant products can become non-compliant, depending on the application method.

Modified Test Method• Gases prepped via method E• Prepared sample from full cylinder• Vented cylinder to near empty• Prepared a second sample• Analyzed via EPA method 524.2

Results

Sample 1 – Manufacturer A Normalized Result (g/L)

Detected VOC Prior to venting After venting, approx. 15% of original Cl2 weight

SPAC (g/L)

Chloroform 0.041 0.14 8.0

Results

Sample 1 – Manufacturer B Normalized Result (g/L)

Detected VOC 86% capacity 9% capacity SPAC (g/L)

Acetone ND 0.43 600 Carbon tetrachloride 0.36 2.83 0.5 Trichlorofluoromethane ND 0.035 200 Sample 2 – Manufacturer B

Normalized Result (g/L) Detected VOC 86% capacity 9% capacity

SPAC (g/L)

Carbon tetrachloride ND 0.02 0.5 Trichlorofluoromethane ND 0.008 200 Vinyl chloride ND 0.008 0.2

AWWA B301-04Section 4.3, Impurities – Liquid chlorine:a.  Moisture ≤ 150 ppmb.  Heavy Metals, sum of all ≤ 30 ppmc.  Lead ≤ 10 ppmd.  Mercury ≤ 1 ppme.  Arsenic ≤ 3 ppmf.   Nonvolatile residue ≤ 50 ppm mfrd rail/tank cars

or ≤ 150 ppm cylindersg.  Carbon tetrachloride ≤ 100 ppmh. Trihalomethanes ≤ 300 ppm

Examples

CCl4 in Cl Gas (%)

CCl4 (ppm)

Dose Rate Cl (mg/L water)

Approx CCl4 in H20 (ug/L)

SPAC/NSF 60 & CA MCL (ug/L)

0.01 100 2 0.2 0.5

0.01 100 5 0.5 0.5 0.01 100 10 1 0.5

0.005 50 2 0.1 0.5

0.005 50 5 0.25 0.5 0.005 50 10 0.5 0.5

RecommendationFormation of a Task GroupReach out to AWWA

Task Group Actions• Discussed Sampling Procedures (no change)• Issue paper for pre-filling requirements• Proposed Modification AWWA B304• Proposed language for AWWA M20 Manual

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Pre-filling Requirements• Add 6.3.4 – Chlorine Container and Rail Car Pre-Filling

Requirements

• Requires any remaining liquids to be removed prior to filling

• Certifiers can audit against these requirements if added to NSF 60

• Motion for this to go to ballot

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Proposed Changes to AWWA B301• Ballot proposal submitted to AWWA

disinfection committee to revise AWWA B301 for the following:

• Carbon Tetrachloride: Revise from the current limit of 100 ppm to 16 ppm.

• Trihalomethanes: Revise from the current limit of 300 ppm to 267 ppm (0.0267 percent).

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AWWA M20 Manual• Proposed language to warn about the issue• Also indicated that the use of vaporizers do

not necessarily remedy the issue• Suggested a remedy if issue is present

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Task Group Complete• Thanks for all the task group participants

• Roster members• Other participants

• Recommend closure of this Task Group

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