Texas
REGULATIONS, RECOMMENDATIONS & GUIDELINES


Weigh Scales for Monitoring Water and Wastewater Treatment Chemicals
 


TEXAS NATURAL RESOURCE CONSERVATION COMMISSION
Design Criteria For Sewerage System

"Weighing Scales. Weighing scales shall be provided for volumetric dry
chemical feeders. The scales shall accurately measure increments of 0.5 percent of load. Weighing scales shall be provided for weighing of carboys which are not calibrated volumetrically."

TX_TNRCC_chem.pdf

 


TEXAS NATURAL RESOURCE CONSERVATION COMMISSION
Design Criteria For Sewerage System

"One ton cylinders shall be stored horizontally on trunnions, and 150 pound cylinders shall be stored vertically and be secured by a clamp or chain. (2) Measurements. A scale for determining the amount of chemical used daily, as well as the amount of chemical remaining in the container, shall be provided for all chlorine and sulfur dioxide systems."

TX_TNRCC_cl2.pdf

 
TEXAS ADMINISTRATIVE CODE
Rules and Regulations for Public Water Systems
Rule 290.42 - Disinfection
(D) Facilities shall be provided for determining the amount of disinfectant used daily as well as the amount of disinfectant remaining for use.

TXAdmnDis.pdf

 
Rule 290.42 - Plant chemical storage and feed facilities
(C) Every chemical bulk storage facility and day tank shall have a label that identifies the facility's or tank's contents and a device that indicates the amount of chemical remaining in the facility or tank.

TXAdmnChem.pdf

 
Rule 290.46 - Operating records and reports
The following records shall be retained for at least two years:
(i) the amount of chemicals used:
(I) Systems that treat surface water or groundwater under the direct influence of surface water shall maintain a record of the amount of each chemical used each day.

TXAdmnRecs.pdf

 
CENTER FOR DISEASE CONTROL (CDC)
Engineering and Administrative Recommendations for Water Fluoridation, 1995

"Day tanks or direct acid-feed carboys/drums should be located on scales; daily weights should be measured and recorded. Volumetric measurements, such as marking the side of the day tank, are not adequate for monitoring acid feed systems."

"Scales must be provided for weighing the amount of chemicals used in the dry feeder."

CDC_Fluoride.pdf

 


AWWA MANUAL M4:
Water Fluoridation Principles and Practices, Third edition:

"In any fluoridation installation, except one based on a sodium fluoride saturator, scales are necessary for weighing the quantity of dry material to be used in preparing the solution, the quantity of solution fed, or the quantity of fluoride compound or hydrofluosilicic acid delivered by the appropriate feeder." -Page 26

"Alarms: To prevent underfeeding or loss of feed, alarm systems can be included in either solution or dry feed systems. The alarm alerts the operator when the level of solution in the day tank is low or when it is time to add chemical." -Page 30


 
THE CHLORINE INSTITUTE
Pamphlet 1, "The Chlorine Manual"

"Weighing-Because chlorine is shipped as a compressed liquefied gas, the pressure in a container depends on the temperature of the chlorine. The pressure is not related to the amount of chlorine in the container. Container contents can be determined accurately only by weighing." –Page 10, Section 2.8.4

 
COMPRESSED GAS ASSOCIATION
CGA G-2 Manual

"Determining when cylinders are empty-Weighing. The best way to determine if an ammonia cylinder is empty is to weigh it, without cap, and compare the weight with the tare weight stamped on the cylinder." -Page 36, Section 8.9.1

 


These documents may not represent a complete list of regulations, recommendations or guidelines. Always consult your local agencies to determine which specific guidelines, recommendations or regulations affect your water or wastewater treatment operation.




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