摘要:

This article discusses problems in maintaining correct coagulant dosages, methods of measuring coagulant dosage, and the use of a streaming current monitor (SCM) to maintain optimum coagulant dosage. The SCM responds to changes in raw water turbidities and flow rates and allows the operator to make the proper adjustments. It also provides an immediate alarm if chemical feed is interrupted for any reason.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1986.tb00189.x

出版商:Wiley    

年代:1986

数据来源: WILEY

摘要:

This article describes a butterfly valve adaptor which can be used to hold and center the key box on a butterfly valve, thereby eliminating problems caused by settling, shifting, or improper key box set. The materials needed for construction are listed, and construction details are provided.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1986.tb00190.x

出版商:Wiley    

年代:1986

数据来源: WILEY

摘要:

This article discusses the best method of measuring water pressure at fire hydrant outlets. The conclusion reached is that failure to bleed the air from the hydrant barrel before making a pressure reading usually does not result in a significant error in the reading. The error only becomes significant for deep laterals and low pressures.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1986.tb00191.x

出版商:Wiley    

年代:1986

数据来源: WILEY

摘要:

This article presents suggestions for the safe handling and storage of compressed gas cylinders. These cylinders typically contain ammonia, chlorine, and other chemicals used in water treatment.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1986.tb00192.x

出版商:Wiley    

年代:1986

数据来源: WILEY