摘要:

Exercising of valves helps to keep them clean and operable, extends valve life, and allows the worker to pin‐point any problems, facilitating repair or replacement of malfunctioning valves. One of the main obstacles to an exercising program is the slow and costly process of operating valves manually, but the use of power equipment will cut valve operating man‐hours by 65%. Valves should be exercised at least once a year. Steps for a routine program are given.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1978.tb01069.x

出版商:Wiley    

年代:1978

数据来源: WILEY

摘要:

Topics in this month's “Certification Corner” include chlorine gas leaks, protozoa, centrifugal pumps, differences between static levels and pumping levels of wells, presedimentation, and bacteriological testing.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1978.tb01071.x

出版商:Wiley    

年代:1978

数据来源: WILEY

摘要:

There are two groups of organisms which will be closely regulated under the new Safe Drinking Water Act, trihalomethanes and man‐made or synthetic organic chemicals. For each of these, information is given on their sources, Maximum Contaminant Levels (if applicable), and monitoring requirements.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1978.tb01072.x

出版商:Wiley    

年代:1978

数据来源: WILEY

摘要:

Bearing lubrication is an important step in pump maintenance procedures. Under average operating conditions, it is recommended that an ounce of grease be added at intervals of three to six months and that only clean grease be used. Mineral greases with a soda soap base are recommended. A regular maintenance timetable should be instituted with monthly inspection of the bearing temperature, and checking for saponification every three months.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1978.tb01073.x

出版商:Wiley    

年代:1978

数据来源: WILEY

摘要:

Presented in this article are samples of some of the types of records that operators should maintain. Among the items and functions which should be recorded are daily time logs, monthly labor costs, feet of new pipe installed, pipeline repair, hydrant installation and so on.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1978.tb01074.x

出版商:Wiley    

年代:1978

数据来源: WILEY

摘要:

Featured in this month's “Gimmicks and Gadgets” is a device for removing and replacing taps in mains without having to take the main out of service.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1978.tb01075.x

出版商:Wiley    

年代:1978

数据来源: WILEY