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Summary of Contents for Netafim SPINNET
- Page 1 UPSIDE-DOWN MICRO-SPRINKLERS/EMITTERS HANDBOOK SPINNET ™ SPINNET ™ VIBRONET ™ COOLNET PRO ™ MISTNET ™ V 001.01 - 2018...
- Page 2 ENDORSEMENT NOR A RECOMMENDATION. NETAFIM™ DOES NOT ASSUME ANY RESPONSIBILITY WITH RESPECT TO THE USE OR THE PROVISIONS OF SUCH PRODUCTS. NETAFIM™ SHALL NOT ACCEPT RESPONSIBILITY FOR ANY DAMAGE OR LOSS THAT MAY OCCUR FROM THE USE OF ITS PRODUCTS OR THIS DOCUMENT.
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Page 3: Table Of Contents
Features and benefits Accessories and complementary products Performance Water trajectory Introduction Distribution uniformity Anti-drain (AD) valve Head loss Stabilizer (serves also as a tool) SpinNet™ SD PE flexible tube Description Top connectors Applications Accessory connection Specifications Appendix Filtration Features and benefits Max. - Page 4 INTRODUCTION The symbols used in this document refer to the following: WARNING Instructions aimed at preventing bodily injury or direct damage to the crops and/or the irrigation system. CAUTION Pertinent guidelines aimed at preventing unwanted system operation, installation or conditions. Failure to follow said guidelines is liable to void the product's warranty.
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Page 5: Objectives Of This Document
It is intended for Netafim's personnel, its representatives and agents across the globe and for its clients, their decision makers, managers and operational personnel. -
Page 6: Micro-Sprinkler/Emitter Selection
Our products enable unprecedented watering uniformity in both standard full overlap installation and with our traditional "strip of micro-sprinklers/emitters". The versatile Netafim™ line of micro-sprinklers/emitters covers a broad scope of applications; thereby simplifying the design process. Whether you are designing a new application or retrofitting an existing system, our micro-sprinklers/emitters offer highly reliable solutions for all your needs. -
Page 7: Germination
(the water cannot pass through the boundary between substrate zones). Thus, although very gentle, the water droplets must be able to provide perfect distribution uniformity. For this purpose, Netafim™ proposes the VibroNet™ bridgeless micro emitter with vibrating action (see page 29). -
Page 8: Rooting
The plant should be grown in a humid environment to facilitate growth of the new roots. The emitters chosen for this purpose must be able to increase humidity in a uniform manner. For this purpose Netafim™ proposes the CoolNet Pro™ super-fine mister (see page 31). -
Page 9: Precipitation Rate (Pr)
Netafim™ conducts rigorous tests to assess the distribution uniformity capacity of its micro-sprinklers/ emitters. The following is a brief summary of these testing procedures. The water distribution uniformity survey: Setup and data collection 1. - Page 10 MICRO-SPRINKLER/EMITTER SELECTION There are 3 methods for calculating distribution uniformity: • Christiansen Coefficient of Uniformity (%CU) - known to produce the most flattering results. • Distribution uniformity (%DU) - known to be more rigorous than %CU. • Scheduling Coefficient (SC) - known to be the most rigorous method of all. Christiansen Coefficient of Uniformity (%CU) The %CU is a measurement of uniformity, expressed as the average rate (%) of deviation from the overall average application.
- Page 11 MICRO-SPRINKLER/EMITTER SELECTION EXAMPLE Average Net application Average net Measurements [mm] - deviation from measurements application average net application average net [mm] [AVG] = application deviations* application 5.14 0.57 5.06 0.49 5.02 0.45 4.99 0.42 4.87 0.30 4.87 0.30 4.83 0.26 4.77 0.20 4.75...
- Page 12 MICRO-SPRINKLER/EMITTER SELECTION Advantage of the %DU method: The measurement of %DU takes the driest results into account. Therefore it is better than %CU, as it compares the area that receives the least water with the average application of the entire area. Calculating %DU 1.
- Page 13 MICRO-SPRINKLER/EMITTER SELECTION Scheduling Coefficient (SC) The Scheduling Coefficient is a run-time multiplier. It represents the time needed to over-irrigate to achieve the average application rate of the entire area in the driest part of the irrigated area. SC = overall average net application / average net application in the driest parts of the irrigated area Advantage of the SC method: SC measurement takes into account the driest area (the part that receives the least water) while ensuring that the entire area is irrigated with at least the minimum required quantity, according to the crop value.
- Page 14 It is common practice among micro-sprinkler/emitter manufacturers to advertise the results of the %CU method only, which are known to be the most flattering. Netafim™, however, insisting on strict standards and zealous R&D procedures, tests its micro-sprinklers/emitters with all 3 methods and provides its customers with the results of the most rigorous analyses.
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Page 15: Max. Length Of Distribution Pipe
EXAMPLE Max. distribution pipe length at different slopes - 10% flow rate loss Where: Distance between emitters (m) Emitter SpinNet™ Nominal flow rate 70 l/h Slope Max. distribution pipe length (m) Head pressure 2.5 bar... -
Page 16: Sprinkler Water Trajectory
MICRO-SPRINKLER/EMITTER SELECTION EXAMPLE Friction loss in the hanging micro-tube and accessories Where: Micro-tube 6.5 mm 4.0 mm Flow rate (l/h) Head loss (bar) Micro-tube Micro- Complete Micro- Complete Micro- Complete length (cm) tube valve unit tube valve unit tube valve unit 0.009 0.05... -
Page 17: Selecting A Micro-Sprinkler/Emitter
Micro-sprinkler/emitter selection table Application Micro-sprinkler/emitter See page Irrigation - full coverage SpinNet™ Irrigation - strip coverage SpinNet™ SD Irrigation above germination tables VibroNet™ Evaporative cooling, rooting and humidity increasing CoolNet Pro™ Under plant cooling MistNet™ UPSIDE-DOWN MICRO-EMITTERS HANDBOOK 17... -
Page 18: Micro-Sprinklers/Emitters Assortment
All parts may be easily assembled and disassembled without tools. Compliance with international standard requirements All Netafim™ micro-sprinklers/emitters are designed and tested according to the 8026 standard requirements. Reliable anti-drain (AD) valves... -
Page 19: Spinnet
Applications In greenhouses, nurseries and net-houses, the SpinNet™ is intended for use above any crop in wide area irrigation. It is possible to plan full coverage/complete overlap while obtaining excellent distribution uniformity. -
Page 20: Filtration
Excellent distribution uniformity on a full coverage irrigation system. • It is strongly recommended to connect the SpinNet™ to the distribution pipe with a SSPE (super soft PE) micro-tube, a specifically designed stabilizer and AD (anti-drain) valve (anti-drain) that will prevent distribution pipe drainage. -
Page 21: Water Trajectory
The layouts, distances, working pressures and heights-above-surface presented in the tables above are solely for demonstration purposes. There are countless additional configurations for micro-emitter placement. To acquire accurate distribution data for a specific crop, contact the pertinent Netafim™ technical team. UPSIDE-DOWN MICRO-EMITTERS HANDBOOK 21... -
Page 22: Head Loss
MICRO-SPRINKLERS/EMITTERS ASSORTMENT Head loss Head loss (bar) in the emitter stand micro-tube and AD valve Nozzle › Head loss (bar) Micro-tube Micro- Complete Micro- Complete Micro- Complete length (cm) tube valve unit tube valve unit tube valve unit 0.009 0.05 0.06 0.016 0.07... -
Page 23: Spinnet™ Sd
Applications The SpinNet™ SD is intended for irrigation in tunnels, over irrigated strips where each line of micro- sprinkler operates individually (without overlaps between adjacent lines of micro-sprinklers). -
Page 24: Filtration
• It is strongly recommended to connect the SpinNet™ SD to the distribution pipe with a SSPE (super soft PE) micro-tube, a specifically designed stabilizer and AD (anti-drain) valve that will prevent distribution pipe drainage. -
Page 25: Performance
MICRO-SPRINKLERS/EMITTERS ASSORTMENT Performance Flow rate calculation Wetted diameter Wetted diameter (meter)* Swivel (rotor) Nozzle SD conn. code color › size size Constant Exponent Nozzle (mm) (mm) Nozzle 050/090 1.22 1.20 11.60 050/090 120/070 1.44 1.46 15.20 120/070 160/070 1.76 1.46 17.70 160/070 160/090... -
Page 26: Head Loss
%CU ≥ 94% ≥ 89% and < 94% < 89% demonstration purposes. There are countless additional configurations for micro-emitter placement. To acquire accurate distribution data for a specific crop, contact the pertinent Netafim™ technical team. Head loss Head loss (bar) in the emitter stand micro-tube and AD valve Nozzle ›... -
Page 27: A Particular Case
Therefore, we offer two alternate solutions for situations in which the span/tunnel to be irrigated is 8 to 12 meter wide: A) One way is to use SpinNet™ micro-sprinklers in full-overlap between adjacent distribution pipes. Thus, at the center between the two distribution pipes, there is full-overlap, but on the other side of the two distribution pipes the micro-sprinklers are not "assisted"... - Page 28 %CU ≥ 94% ≥ 89% and < 94% < 89% demonstration purposes. There are countless additional configurations for micro-emitter placement. To acquire accurate distribution data for a specific crop, contact the pertinent Netafim™ technical team. 28 UPSIDE-DOWN MICRO-EMITTERS HANDBOOK...
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Page 29: Vibronet
• When sand/silt/clay solids exceed 100 ppm, preliminary treatment is to be applied according to guidelines issued by Netafim's team of experts. Features and benefits • VibroNet™ micro-emitters are constructed without a "bridge" to retain the deflector. This benefit produces: a. -
Page 30: Performance
There are countless additional configurations for micro-emitter placement. To acquire accurate distribution data for a specific crop, contact the pertinent Netafim™ technical team. Head loss Head loss (bar) in the emitter stand micro-tube and AD valve Nozzle ›... -
Page 31: Coolnet Pro
These very small nozzles are prone to clogging when water with a relatively high content of salts/carbonates (see Netafim™ Drip Irrigation System Maintenance Handbook, page 40) is used. -
Page 32: Mister Vs. Fogger
To clarify: Netafim's CoolNet Pro™ mister provides, under optimal working conditions, a very gentle mist with droplets of an average size of 65 microns at a 4.0 bar working pressure. -
Page 33: Performance
MICRO-SPRINKLERS/EMITTERS ASSORTMENT WARNING When handling acid, always observe the product safety instructions and avoid acid coming in contact with the crop, the soil/substrate and the environment. • Micro sized droplets, at a relatively low pressure of 4.0 bar the CoolNet Pro™ uniformly distributes an average droplet size of 65 micron. -
Page 34: Applications
7) and thus consume energy from the environment (cooling it). Netafim™ recommends that the system be run on one-second fixed pulses at the frequency determined based upon an environmental-condition sensor that measures humidity and temperature. NOTE Optionally, the amount of water required to cool a certain volume of air under a variety of environmental conditions can be calculated using the psychometric chart or one of the many on-line calculators based on the same data (for example: http://www.uigi.com/WebPsycH.html). -
Page 35: Rooting
MICRO-SPRINKLERS/EMITTERS ASSORTMENT Rooting For this agricultural application, it is required to create a volume of humidity-saturated air around the cuttings to facilitate their optimal development. To achieve this goal, we recommend the CoolNet Pro™ mister. Installation recommendations for rooting with the cross mister with 4 nozzles of 7.5 l/h each, with a pressure of 4.0 bar at the nozzles: 1.5 x 1.5 meters, 1.5 meters above the surface. -
Page 36: Mistnet
When the CoolNet Pro™ is used above the crop for cooling or humidifying and the water carbonate content is high (see Netafim™ Drip Irrigation System Maintenance Handbook, page 40), it is highly recommended to install a reverse-osmosis filtration system upstream of the misting system. -
Page 37: Specifications
Wherever sand exceeding 2 ppm exists in the water, a hydrocyclone sand separator is to be installed upstream from the main filter. • When sand/silt/clay solids exceed 100 ppm, preliminary treatment is to be applied according to guidelines issued by Netafim's team of experts. Features and benefits • Interchangeable components. -
Page 38: Accessories And Complementary Products Introduction
"sense" the recommended working pressure and therefore function perfectly. If the SpinNet™ has been chosen, the best choice is a model that will open at a working pressure of 2.0 bar (for the same reason). -
Page 39: Stabilizer (Serves Also As A Tool)
In addition, Netafim's stabilizer has two dents at its extremities serving as an aid to the system assembly or operation. These dents suit the geometric shape of Netafim's connectors. Inserting the connectors into the dents allow the installer/operator to apply more force in a convenient and very fast manner without the need for other tools. -
Page 40: Pe Flexible Tube
Netafim™ recommends using SSPE (super soft PE) micro-tubes developed specifically by Netafim™ for this purpose. Netafim™ recommends not using PVC piping (although accepted in some markets). Netafim™ does not provide such products, because the substances that elasticize the PVC micro-tubes are washed out of the micro-tube by the water and while a new micro-tube is soft and flexible, over time it becomes increasingly harder. -
Page 41: Accessory Connection
ACCESSORIES AND COMPLEMENTARY PRODUCTS Accessory connection Connecting the hanging stand top connector to the distribution pipe: Barb connector - for PE pipes Punching a hole Preparing a thread Create a 3 mm hole in the distribution pipe - Use a in a PE pipe in a PVC pipe dedicated 3 mm punching tool. -
Page 42: Appendix
APPENDIX Max. distribution pipe length with 10% flow variation The data in the tables below is for demonstration and initial impression. In order to determine the maximum distribution pipe length while maintaining a flow rate variation of no more than 10%, under actual conditions, it is very important to consult the irrigation/hydraulic designer. - Page 43 APPENDIX Flow rate: 50 l/h , pressure at the micro-sprinkler/emitter head: 3.0 bar Distance between emitters (m) Max. distribution pipe length (m) PE pipe 16 mm, ID: 13.2 mm Uphill Flat terrain Downhill PE pipe 20 mm, ID: 17.0 mm Uphill Flat terrain Downhill...
- Page 44 APPENDIX Flow rate: 90 l/h , pressure at the micro-sprinkler/emitter head: 3.0 bar Distance between emitters (m) Max. distribution pipe length (m) PE pipe 20 mm, ID: 17.0 mm Uphill Flat terrain Downhill PE pipe 25 mm, ID: 21.2 mm Uphill Flat terrain Downhill...
- Page 45 APPENDIX Flow rate: 160 l/h , pressure at the micro-sprinkler/emitter head: 3.0 bar Distance between emitters (m) Max. distribution pipe length (m) PE pipe 20 mm, ID: 17.0 mm Uphill Flat terrain Downhill PE pipe 25 mm, ID: 21.2 mm Uphill Flat terrain Downhill...
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Page 46: Warranty
Netafim™ warrants all the components of its micro-sprinklers/emitters to be free of substantial defects in material and workmanship for a period of 1 (one) year from the date of purchase. If a defect is discovered during the applicable warranty period, Netafim™ will repair or replace, at its discretion, the product or the defective part. - Page 48 GROW MORE WITH LESS WWW.NETAFIM.COM...
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