摘要:

Hydrant inspection should be done twice a year to ensure proper operation. The three types of fire hydrants, dry barrel, wet barrel and compression type, and types of drains are discussed.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1977.tb01018.x

出版商:Wiley    

年代:1977

数据来源: WILEY

摘要:

This month's “Certification Corner” contains questions on a variety of topics such as lime, organics in raw water, the purpose of presedimentation, turbine pumps, and valves.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1977.tb01019.x

出版商:Wiley    

年代:1977

数据来源: WILEY

摘要:

A brief history of metric conversion attempts in the United States is presented.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1977.tb01021.x

出版商:Wiley    

年代:1977

数据来源: WILEY

摘要:

Water in reservoirs usually stratifies into three layers. For purposes of this article, the upper two layers are referred to as the circulation zone and the bottom layer will be known as the stagnation zone. Turnover of reservoir water occurs twice a year, in the winter and summer. Some of the results of the turnover can be offensive tastes and odors in the water. To avoid any sudden water quality changes, the reservoir can be artificially destratified by the addition of oxygen or air into the stagnation zone, or by pumping water from the stagnation zone into the circulation zone to keep the layers of water mixed.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1977.tb01022.x

出版商:Wiley    

年代:1977

数据来源: WILEY

摘要:

A question is presented on using lime to soften water with a total alkalinity of 224 ppm, a total hardness of 528 ppm, and a calcium hardness of 285 ppm. Professor Opflow suggests a jar test to ascertain the softening possibilities.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1977.tb01023.x

出版商:Wiley    

年代:1977

数据来源: WILEY

摘要:

There are two important differences between the Secondary and the Interim Primary Regulations that water utility operators should keep in mind. While the IPRs are mandatory standards concerned with contaminants that can cause harmful health effects, the Secondary Regulations are guidelines that set limits for those constituents that can affect the aesthetic quality of drinking water, such as color, taste, and odor. Differences in enforcement are also mentioned.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1977.tb01024.x

出版商:Wiley    

年代:1977

数据来源: WILEY

摘要:

The “medical gate block” is a device that will prevent anyone from shutting off a gate valve without first removing the block. It was developed specifically for use in conjunction with the many life‐supporting machines found in the Los Angeles, California area.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1977.tb01025.x

出版商:Wiley    

年代:1977

数据来源: WILEY