Netafim TECHLINE AS Guida

TECHLINE AS™

DESIGN GUIDE

A complete guide for the design of on-surface and sub-surface drip

irrigation systems using Techline AS™.

T E C H L I N E A S ™ D E S I G N G U I D E

NETAFIM @[email protected]oc 21/12/2009 2

TABLE OF CONTENTS

INTRODUCTION 4

OVERVIEW 4

WHAT IS TECHLINE AS™ 5

Applications 6

Specifications 6

Technical Data 6

DESIGN CRITERIA 7

Site Survey 7

Point Of Connection 7

Which Techline AS™ Product Should You Use? 8

Types Of Layouts 9

“GRID” Layouts 9

“LITE” Layouts 9

What Do These Layouts Have In Common 9

Standard “GRID” Layout 10

Standard “LITE” Layout 10

How To Calculate Equal Techline AS™ Row Spacing 10

Length of Techline AS™ Rows 11

Centre Feed “GRID” Layouts 11

Other “GRID” Considerations 12

Mainline Sizing 13

Submain Sizing 13

Zone Water Requirements 14

Techline AS™ Flow Charts 14

Fittings 15

Pipe Stakes 15

Line Flushing Valves 16

Automatic Line Flushing Valve 16

Manual Flushing Valve 16

Air/Vacuum Release Valve 17

Filters 18

Pressure Regulating Valves (PRV’s) 18

Pressure & Flow Checks 19

Line Indicator Flag 19

Slopes and Mounds 20

Techline AS™ in Turf (SDI) 21

Techline AS™ in New Sodded Turf 21

Techline AS™ Above and Below Grade 21

TechFilter (SPU) 22

Techline ASTM (Bioline AS™) 23

TECHLINE AS™ INSTALLATION DRAWINGS 24

Square Layout 24

Centre Feed Layout 24

Triangular Layout 25

Typical Island Outlet 25

Odd/Curve Layout 26

Circular Layout 26

Headwork’s with RPZ 27

Headwork’s with DCV 27

Control Valve (Above Ground) 28

Control Valve (Sub-Surface) 28

T E C H L I N E A S ™ D E S I G N G U I D E

NETAFIM @[email protected]oc 21/12/2009 3

TECHLINE AS™ DESIGN FORMULAS 29

Formula 1.1 Estimated Total Length Of Dripperline 29

Formula 1.2 Application Rate 29

Formula 1.3 Number Of Drippers In A Zone 29

Formula 1.4 Flow Per Zone 30

Formula 1.5 Estimated Total Zone Flow 30

CALCULATING TECHLINE AS™ RUN TIMES 31

TECHLINE AS™ INSTALLATION GUIDE 35

Specifications 35

System Maintenance 37

Techline AS™ System Inspection Checklist 38

Techline AS™ Installation Tools 39

TECHLINE AS™ ACCESSORIES 40

T E C H L I N E A S ™ D E S I G N G U I D E

NETAFIM @[email protected]oc 21/12/2009 4

INTRODUCTION:

This manual has been prepared to assist with the correct use of Techline AS™ for irrigation

projects that are either On-Surface Drip Irrigation (OSDI) for garden areas or Sub-surface Drip

Irrigation (SDI) for turf areas. Included are design steps, technical data, design layouts, as well

as some design installation details and check list using both “Grid” and “Basic” layout methods.

OVERVIEW:

Netafim is the world leader in low volume irrigation. Since the early 1960’s Netafim has

pioneered the science of sub-surface and point source irrigation manufacturing.

Serving more than 100 countries worldwide, Netafim products are sold into the

Landscape & Turf market, as well as Agriculture, Green-House, Nursery, Waste Water

re-use, Mining and Forestry markets.

The Techline family of dripperline products has been used successfully in Landscape

since 1987. The recent addition of Techline AS™ has guaranteed that it will continue to

perform reliably and successfully in this market.

Landscape Architects, Contractors, Nurserymen, Designers and Consultants recognize

the benefits of using low volume drip irrigation for new plantings because of its

accelerated plant growth compared to overhead spray or rotor irrigation. Coupling rapid

growth with dramatic water savings and low volume irrigation becomes an important

part of any Landscape project.

With the flexibility and quality of Netafim products, Architects, Designers and

Contractors have highly sophisticated solutions to client and installation issues by

bringing drip and sub-surface components together to grow plants, trees, shrubs,

groundcover, ornamental grasses and turf.

T E C H L I N E A S ™ D E S I G N G U I D E

NETAFIM @[email protected]oc 21/12/2009 5

WHAT IS TECHLINE AS™?

Techline ASTM is an integrated dripperline (brown poly pipe with drippers moulded in to it at set

spacing’s from the factory) manufactured in Australia by Netafim Australia. Conventional

dripperlines usually feature either a Non Pressure Compensating (Non PC) dripper (used on flat

ground) or Pressure Compensating (PC) drippers (used on both flat and sloping ground).

Techline ASTM features the special Netafim DripNet ASTM dripper which is a Pressure

Compensated (PC) self regulating dripper that also has a unique Anti-siphon mechanism that

prevents “suck-back”.

What is Suck-Back?

Suck-back occurs when a dripperline stops watering and water drains out of dripperline and

creates a vacuum inside the tube. The vacuum inside the dripperline can draw contaminated

water, dirt or debris back into the dripper and cause possible drip blockage or damage.

The Anti-siphon mechanism closes off when a vacuum forms inside the dripperline preventing

any suck back into the dripper or dripperline. Anti-siphon mechanism offers unsurpassed

protection for all drip systems in under mulch and sub-surface installations.

TECHLINE AS™ FEATURES:

Anti-siphon mechanism – prevents contaminants from being drawn inside the dripper

when a vacuum forms inside the dripperline at shut off.

Self-compensating & self flushing dripper mechanism – ensures that the dripper

discharges at a uniform rate and remains clean.

Unique TurboNet™ regulating water passage – increases turbulent flow through the

dripper ensuring that suspended solids in the water remain suspended.

Large centrally mounted drip inlet filter – prevents sediment entering the drip inlet

Mechanical root barrier – coupled with a Netafim Techfilter offers the best protection

against root intrusion in sub-surface drip systems.

UV resistant dripperline – designed for trouble free operation.

7 year warranty – pro rata (Conditions apply)

Compatible with standard 13mm fittings.

T E C H L I N E A S ™ D E S I G N G U I D E

NETAFIM @[email protected]oc 21/12/2009 6

APPLICATIONS:

Sub-surface installations (below turf).

On surface installations (under mulch).

Areas prone to vandalism – dripperline is covered by mulch or turf.

Areas subject to slopes or changing topography.

Ideal in windy areas – no mist or over-spray.

Ideal for both regular and odd shaped areas.

Discrete in high profile landscapes.

SPECIFICATIONS:

Low and high flow rates: 1.6L/H & 3.0L/H.

Pressure compensating range: 40kPa to 250kPa.

Anti-siphon Mechanism: prevents “suck-back”.

Maximum Operating Pressure: 250kPa.

Recommended Filtration: 120 mesh (130 micron)

Dripperline inside diameter (I.D.): 12.9mm

Dripperline outside diameter (O.D.): 15.3mm

TECHNICAL DATA:

T E C H L I N E A S ™ D E S I G N G U I D E

NETAFIM @[email protected]oc 21/12/2009 7

DESIGN CRITERIA:

Designing with Techline AS™ follows the same basic rules as designing with sprays

and rotors.

A point of connection (water connection point) must be established and its static and

operating pressure, flow rate and water quality recorded.

Identifying the type of plants that are to be irrigated and grouping plants with similar

water requirements (Hydro-zoning) will ensure that maximum watering efficiency can be

maintained.

Identifying the sites soil type, topography and micro climatic influences.

SITE SURVEY:

Obtain or draw a scaled plan of the site to be irrigated. Identify all slopes on the plan.

Identify the type of soil (light, medium or heavy).

Determine the type of plants that are to be irrigated, turf, groundcover, shrubs, plants

and trees etc.

Mark any other points of interest that have a bearing in the systems design like areas

subjected to prolonged periods of shade, unusually high wear and tear, areas prone to

high wind, or areas that may be subjected to mechanical damage.

POINT OF CONNECTION:

Type of water, potable (mains/scheme) or non potable (bore, grey or treated waste

water etc)

Pressure & volume available – static and operating tests

Record the water quality (dirty water will require a higher level of filtration)

Water availability – is the water supply constantly available or does the supply vary.

Ensure that the appropriate back-flow prevention device is used.

Site Survey

T E C H L I N E A S ™ D E S I G N G U I D E

NETAFIM @[email protected]oc 21/12/2009 8

WHICH TECHLINE AS™ PRODUCT SHOULD YOU USE?

From Table 1 (below), answer two questions:

1. Are you irrigating Garden or Turf?

2. Is the soil type Light, Medium or Heavy?

Follow the relevant column listed under Garden or Turf to identify the proper Techline

AS™. Example – if you choose “Garden”, with “Medium” soil, 1.6L/H 0.4m Techline

AS™ is recommended. (Each dripper will deliver 1.6L/H and the drippers, mounted

inside the dripperline are spaced 0.4m apart.)

What other information is in the General Guidelines Chart?

1. How far to spread out the dripperline lateral is listed on the “Lateral (Row) Spacing”

line. (For example, rows should be evenly spaced from 0.4m to 0.5m apart)

2. The corresponding application rates and time to apply are listed under the “Lateral

Spacing” line. (With rows of 1.6L/H Techline AS™ every 0.4m apart, the application

rate is 10mm per hour and so it will take 60 minutes to apply 10mm of water. If the

rows are 0.5m apart, the application rate is 8.0mm per hour and will take 75

minutes to apply 10mm of water. Refer to Table 1 for other spacing configurations).

TECHLINE ASTM D.I.Y. CALCULATOR:

A Netafim Techline ASTM D.I.Y. Calculator can be downloaded from the Landscape section (

http://www.netafim.com.au/index.php?sectionid=3 )of the Netafim Australia website.

The calculator allows you to select relevant data from a range of pop up windows to simply and

quickly determine correct dripper flow & spacing, total flow & number of zones required, total

amount of dripperline required etc.

T E C H L I N E A S ™ D E S I G N G U I D E

NETAFIM @[email protected]oc 21/12/2009 9

TYPES OF LAYOUTS:

There are two common layout methods that we recommend – “GRID” and “LITE”. Both

accomplish the same goal, but one method will be preferred method on what you are irrigating.

“GRID” Layout:

This is the preferred method for installing Techline AS™ sub-surface.

This method uses supply and collecting manifolds with rows of Techline AS™

connected at each end.

The Supply Manifold delivers water to each row of Techline AS™.

The Exhaust Manifold forms a continuous loop, or return leg, so all rows of Techline

AS™ are being supplied from both ends.

This interconnection of the piping network comprises the term “GRID layout”. This

evens out the flow, helps ensure water is being delivered downstream of any breaks in

the laterals and allows for much easier repairs of any line breaks. It will also allow for a

flushing point to be installed on the Collecting manifold.

“LITE” Layout:

The “LITE” layout is used exclusively on-surface (under mulch installations).

It is the fastest and possibly the easiest method because no supply and collecting

manifolds are used.

The dripperline simply weaves back and forth throughout the zone at evenly spaced

rows.

WHAT DO THESE LAYOUTS HAVE IN COMMON?

Both methods assume even row spacing will be maintained.

Both methods are designed to flow water in a loop manner.

T E C H L I N E A S ™ D E S I G N G U I D E

NETAFIM @[email protected]oc 21/12/2009 10

STANDARD “GRID” LAYOUT:

Manifolds should be set in 50mm – 100mm from hard scapes and planting areas.

Manifolds may be PVC, LDPE Poly Pipe (refer table below).

Manifolds must be sized to accommodate the flow of the zone without exceeding 1.6

metres per second velocity. (Zone Water Requirement calculations are on page 10).

Start rows of Techline AS™ 50mm – 100mm away from the edge of hard scapes, and

move across the area with equal row spacing that does not exceed the

recommendations of Table 1. (The 50mm setback will help provide enough moisture to

prevent heat damage to plant material generated by hard scapes such as concrete or

asphalt).

Start rows about 100mm away from planting beds.

STANDARD “LITE” LAYOUT:

Water being supplied to the zone is split with a “T-piece” into two directions.

Weave Techline AS™ back and forth throughout the planting area with evenly spaced

rows.

Indent the tubing 50mm – 100mm from hardscapes and planting areas.

Water is being split into two separate paths that meet in the middle; the maximum

length of the lateral can be twice the stated limit in Table 2.

To determine the maximum amount of Techline AS™ you can use in the zone, simply

double the maximum length stated in Table 2.

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