ISO 16149:2006

Agricultural irrigation equipment - PVC above-ground low-pressure pipe for surface irrigation - Specifications and test methods

ISO 16149:2006 specifies the requirements for unplasticized polyvinyl chloride (PVC) piping, used to supply and to distribute low-pressure irrigation water through gates. It is applicable to PVC piping with diameters of from 50 mm to 315 mm, operating at low pressures and exposed to sunlight.

Matériel agricole d'irrigation — Tube en PVC, posé au-dessus du sol et utilisé avec basse pression pour l'irrigation en surface — Spécifications et méthodes d'essai

General Information

• Status: Published
• Publication Date: 19-Feb-2006
• ICS: 65.060.35 - Irrigation and drainage equipment
• Technical Committee: ISO/TC 23/SC 18 - Irrigation and drainage equipment and systems
• Drafting Committee: ISO/TC 23/SC 18 - Irrigation and drainage equipment and systems
• Current Stage: 9093 - International Standard confirmed
• Start Date: 10-Mar-2021
• Completion Date: 13-Dec-2025

Overview

ISO 16149:2006 - Agricultural irrigation equipment - PVC above-ground low-pressure pipe for surface irrigation - Specifications and test methods - defines requirements and test methods for unplasticized polyvinyl chloride (PVC-U) pipes used as above-ground, low-pressure gated pipes for surface irrigation. The standard applies to nominal diameters 50 mm to 315 mm, for systems operating at low pressures (<100 kPa) and exposed to sunlight. It covers product marking, dimensions, mechanical and physicochemical performance, sampling and acceptance, and specific test procedures.

Key topics and technical requirements

• Scope & applicability: PVC above-ground low-pressure gated pipes for surface irrigation (50–315 mm), intended for supplying and distributing irrigation water.
• Marking: Permanent markings required (manufacturer/trademark, material classification, nominal diameter, reference to ISO 16149, production code).
• Dimensions & tolerances: Outside diameter tolerances specified for each nominal size (e.g., 50 mm +0.3 mm; 315 mm +0.9 mm). Minimum wall thickness defined as 2.2 mm or determined by a formula based on diameter, pressure and design stress; wall thickness tolerance is +12% or 0.8 mm, whichever is greater.
• Mechanical tests:
  • Impact resistance (tup falling weight) - pipes and gates must not break or separate.
  • Crushing resistance - no breaks, splits or permanent distortion under specified compression.
  • Accelerated aging (weathering) - UV/condensation cycle to demonstrate resistance to sunlight exposure.
  • Watertightness of joints and gates - tested at 250 kPa for at least 15 minutes.
• Physico-chemical tests:
  • Dichloromethane resistance - indicates polymer gelation/uniformity (100% of surfaces must resist attack).
  • Longitudinal reversion - length change under high temperature (limits and defect checks).
  • Vicat softening temperature - must be > 80 °C.
• Flow performance: Gate flow rate at manufacturer’s recommended pressure must not deviate by more than ±10%.

Applications and who uses the standard

• Manufacturers of PVC gated irrigation pipe - product design, quality control and labeling.
• Testing laboratories - implementing the specified mechanical and chemical test methods.
• Irrigation system designers, contractors and suppliers - selecting compliant above-ground low-pressure piping for surface irrigation systems (gated laterals, furrow/rise irrigation).
• Procurement officers and regulators - specifying acceptance criteria and sampling plans for irrigation equipment.
• Farmers and agronomists - ensuring durability and performance of gated PVC piping exposed to sunlight.

Related standards

Normative and referenced documents include: ISO 1167-1/-2, ISO 2505, ISO 2507-1/-2, ISO 9852. Additional relevant standards cited in the bibliography: ISO 3126, ISO 3951, and industry test methods (ASTM G53, ASTM D2441, ASTM D2444).

Keywords: ISO 16149, PVC above-ground low-pressure pipe, surface irrigation, gated pipe, specifications, test methods, PVC-U, irrigation equipment, impact resistance, dichloromethane resistance, Vicat softening temperature.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 16149
First edition
2006-02-15
Agricultural irrigation equipment —
PVC above-ground low-pressure pipe
for surface irrigation — Specifications
and test methods
Matériel agricole d'irrigation — Tube en PVC, posé au-dessus du sol et
utilisé avec basse pression pour l'irrigation en surface — Spécifications
et méthodes d'essai
Reference number
©
ISO 2006
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ii © ISO 2006 – All rights reserved

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 16149 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and
forestry, Subcommittee SC 18, Irrigation and drainage equipment and systems.

INTERNATIONAL STANDARD ISO 16149:2006(E)

Agricultural irrigation equipment — PVC above-ground
low-pressure pipe for surface irrigation — Specifications
and test methods
1 Scope
This International Standard specifies the requirements for unplasticized polyvinyl chloride (PVC) piping, used
to supply and to distribute low-pressure irrigation water through gates. lt is applicable to PVC piping with
diameters of from 50 mm to 315 mm, operating at low pressures and exposed to sunlight.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 1: General method
ISO 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 2: Preparation of pipe test pieces
ISO 2505 (all parts), Thermoplastics pipes — Longitudinal reversion
ISO 2507-1, Thermoplastics pipes and fittings — Vicat softening temperature — Part 1: General test method
ISO 2507-2, Thermoplastics pipes and fittings — Vicat softening temperature — Part 2: Test conditions for
unplasticized poly(vinyl chloride) (PVC-U) or chlorinated poly(vinyl chloride) (PVC-C) pipes and fittings and
for high impact resistance poly (vinyl chloride) (PVC-HI) pipes
ISO 9852, Unplasticized poly(vinyl chloride) (PVC-U) pipes — Dichloromethane resistance at specified
temperature (DCMT) — Test method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
bell
receiving shape at one end of a section of pipe that serves as a watertight seal when the spigot end of an
adjoining pipe section is inserted into the bell
3.2
bevel
smoothed annular and angular area at the end of the spigot for assisting in the coupling of the bell and spigot
joint
3.3
dichloromethane resistance
resistance following exposure to dichloromethane in order to give an indication of the level of gelation in the
pipe and of the uniformity of that gelation
3.4
gate
adjustable opening in the pipe which allows water to be released
3.5
impact strength
measure of the brittleness or the toughness of a material
3.6
longitudinal reversion
change in length of a pipe under higher-than-ambient temperature estimated by subjecting a test portion of
pipe immersed in an inert liquid maintained at a temperature of 150 °C for a period of time determined by the
wall thickness of the pipe
3.7
low pressure
pressure less than 100 kPa
3.8
nominal pipe diameter
reference value for the size of a gated pipe approximately equal to the outside diameter of the pipe, rounded
to the nearest millimetre
3.9
spigot
inserting end of a section of pipe in the bell
3.10
vicat softening temperature
temperature at which a standard indenter under a force of 50 N penetrates 1 mm into the surface of a test
piece cut from the wall of a pipe while the temperature is raised at a constant rate of 50 °C/h
3.11
maximum working pressure
highest water pressure at the inlet to a gated pipe unit recommended by the manufacturer to ensure proper
operation
4 Marking
Each pipe shall bear clear and permanent markings, including the following:
a) name of manufacturer or registered trademark of the manufacturer;
b) classification code of the material;
c) nominal diameter;
d) reference to this International Standard (i.e. ISO 16149);
e) production code — compound, extruder, year, month, day, shift.
2 © ISO 2006 – All rights reserved

5 Specifications
5.1 General
The product in conformance with this International Standard shall have specifications according to 5.2 to 5.4.
5.2 Dimensions
5.2.1 Outside diameter
The outside diameter and corresponding tolerances shall be in accordance with Table 1.
Table 1 — Outside diameters and corresponding tolerances
Dimensions in millimetres
Nominal diameter Outside diameter Tolerance
d d
n o
50 50 + 0,3
75 75 + 0,4
100 100 + 0,4
125 125 + 0,5
160 160 + 0,5
200 200 + 0,6
250 250 + 0,8
315 315 + 0,9
Other diameters may be manufactured by agreement between user and manufacturer.

5.2.2 Wall thickness
The minimum wall thickness shall be 2,2 mm or the result of the following equation, whichever is the greater:
dP
o
t=
2SP+
where
t is the minimum wall thickness in millimetres (mm);
P is the pressure in kilopascals (kPa);
S is the design stress in kilopascals (kPa);
d is the outside diameter, in millimetres (mm).
o
The wall thickness tolerance shall be + 12 % or 0,8 mm, whichever is the greater.
The dimensions shall be measured accor
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