Manufacturing variation for various trickle irrigation on-line emitters

The efficiency of trickle irrigation systems depends directly on the uniformity with which water is discharged from the emission devices throughout the system. Ideally, all emitters in the system should discharge equal amounts of water. One major cause of flow rate difference between two identical e...

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Bibliographic Details
Published inApplied engineering in agriculture Vol. 11; no. 2
Main Authors Ozekici, B. (Cukurova University, Adana, Turkey.), Sneed, R.E
Format Journal Article
LanguageEnglish
Published 01.01.1995
Subjects
AGUA
CONCEPTION
DISENO
EAU
EQUIPO DE RIEGO
INDUSTRIA
INDUSTRIE
IRRIGATION GOUTTE A GOUTTE
MATERIEL D'IRRIGATION
PROCESAMIENTO
RESEAU D'IRRIGATION
RIEGO POR GOTEO
SISTEMAS DE RIEGO
TRAITEMENT
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Summary:The efficiency of trickle irrigation systems depends directly on the uniformity with which water is discharged from the emission devices throughout the system. Ideally, all emitters in the system should discharge equal amounts of water. One major cause of flow rate difference between two identical emitters from the same manufacturer is the manufacturing variation. This study compared manufacturers' rated discharges and coefficient of manufacturing variation values with tested values for various on-line emitters. Discharge rates from different types of trickle irrigation emitters were collected at five different pressure levels. Pressure compensating emitters were tested at 100, 150, 200, 250, and 300 kPa (15, 21.8, 29.0, 36.3, and 43.5 psi). Nonpressure compensating emitters were tested at 75,100,125,150, and 175 kPa (10.9, 15, 18.1, 21.8, and 25.4 psi). Emitter discharge rates and coefficient of manufacturing variation were compared with manufacturers' specifications. At the suggested operating pressure of 100 kPa (15 psi) only 11 of the 17 emitters had flow rates within 10% to those claimed by the manufacturers. This was particularly true for the noncompensating emitters. Measured values of coefficient of manufacturing variation were higher than those specified by the manufacturers. High coefficients of manufacturing variation could result in low emission uniformities. Designs based on supplied data may deliver too little water to some plants and too much water to others. Designs should be based on reliable test data, not on manufacturer's supplied data
Bibliography:9548535
F06
N20
ISSN:0883-8542
1943-7838
DOI:10.13031/2013.25734