GB/T 19812.2-2017Plastic equipment for water saving irrigation—Part 2: Pressure compensating emitter and emitting pipe (English PDF)

Foreword

GB/T 19812 "plastic water-saving irrigation equipment" is divided into five parts.

--- Part 1. Single-wing labyrinth drip tape;

--- Part 2. Pressure compensated dripper and drip irrigation pipe;

--- Part 3. Inlaid drip irrigation pipe (with);

--- Part 4. Polyethylene (PE) hoses;

--- Part 5. Buried drip pipe.

This section GB/T 19812 Part 2.

This section drafted in accordance with GB/T 1.1-2009 given rules.

This Part replaces GB/T 19812.2-2005 "plastic water-saving irrigation equipment pressure compensated dripper and drip irrigation pipe", and GB/T 19812.2-2005 compared to the main technical content changes as follows.

--- The standard name was changed to "plastic water-saving irrigation equipment Part 2. Pressure compensated dripper and drip irrigation pipe";

--- Removed the last paragraph of "scope" "This section does not apply to seepage pipes and buried drip irrigation pipe" (see Chapter 1, GB/T 19812.2-2005 edition of Chapter 1);

--- Removed "normative references" GB/T 17188, an increase of GB/T 2918, GB/T 19278, GB/T 19466.6, GB/T 19812.1-2017, SL571 (see Chapter 2, Chapter 2 of the 2005 edition);

--- Removed "terms and definitions" in the "flow index" and "flow index", an increase of "pressure-compensated dripper and drip irrigation" set (See Chapter 3, Chapter 3 of the 2005 edition);

--- Removed "materials" in the "pressure compensation of functional components should be able to meet the normal use of five-year requirements"; added "manufacturing drip irrigation The material used is preferably polyethylene "and" should not be recycled from medical waste and toxic and hazardous chemical packaging "(See 5.1 and 5.4, version 6.3 of 2005);

--- "Mark" added "wall thickness" marking requirements "Specifications. Nominal diameter (mm) × nominal wall thickness (mm) × Drip hole spacing (mm) "(see 4.2.1);

--- Modify the size of drip irrigation pipe specifications, an increase of nominal wall thickness of 0.4mm, 0.6mm, 0.8mm, 0.9mm specifications and pole Limit deviation ", delete the" nominal wall thickness of 1.3mm and above "and" 250kPa, 400kPa "two kinds of pressure level requirements (see 6.3.1.1, the 2005 edition of 7.2.1);

--- Increase the "number of sections per roll, length of each section and the length of each roll deviation rate" requirements (see 6.3.3, 2005 edition of 7.2.1);

--- Modify the "C" and "Cv" values in the "Flow Uniformity" requirement and "C" to "Change the average flow rate q of the drip hole relative to the rated flow The deviation (C) of the quantity qn shall be within ± 7%, and the Cv "shall be amended to" shall not exceed 7% "(see 6.4.1 and 6.4.2, 2005 edition Of 7.3);

--- Modify the "flow and pressure curve" requirements, revised as "within the pressure compensation, flow and inlet pressure curve Should be consistent with the manufacturer, the maximum deviation between the two flow should be within ± 7%. "(See 6.5.1, 2005 edition) 7.4.1);

--- Increase the "flow index measured value and manufacturers claim the value of the deviation" requirement (see 6.5.2, 2005 edition of 7.4.3);

--- Increase the "correlation coefficient" requirements and "correlation coefficient" calculation method (see 6.5.3 and 8.5.3);

--- Modify "hydrostatic pressure at 60 °C water temperature" as "pressure resistance at 45 °C" (see 6.6.2, 2005 edition 7.5.2);

--- Modify the "carbon black content" indicator "(2.25 ± 0.50)%" (see 6.10, 2005 edition of 7.10);

--- Increasing the "oxidation induction time" indicators and test methods (see 6.9 and 8.9);

--- Increase the sample conditioning requirements, "Unless otherwise specified, the sample according to GB/T 2918-1998 provisions should be at an ambient temperature of (23 ± 2) °C conditions for at least 24h state adjustment. (See 7.2, 2005 edition 8.1);

--- Increased drip hole spacing deviation rate calculation method (see 8.3.3);

--- Increased "flow uniformity" test "samples and methods" can be used "closed circuit" or "loop method", "arbitration test using the ring Road Act "(see 8.4.1.1, version 8.4.3.1 of the 2005 edition);

--- Increased "test device" in the "loop method" test device requirements (see 8.4.2, 2005 version 8.4.2);

--- Modify the "batch" program content, revised as "the same raw materials, formulations of the same specifications for the production of a drop of each batch of 100000, production of less than 100000 seven days, according to seven days of production for a group "(see 9.1.1, 2005 edition 9.1.1);

--- Added "Batch N" and "Sample Size n" in the "Sampling Plan" in Table 4 (see 9.2.2 Table 4, Table 9.2.2 of the 2005 edition);

--- Modify the "type test" period, revised to "two years" (see 9.3, 2005 edition 9.3);

--- Modify the "rules of determination", respectively, provided for "factory inspection" and "type test" decision rules (see 9.4.1 and 9.4.2, 2005 Version 9.4);

--- The product storage time from "the product from the date of manufacture should not be stored for more than five years" was revised to "the product from the date of production storage The period should not exceed two years "(see 10.4.4, 2005 edition 10.4).

1 Scope

GB/T 19812 provisions of this section pressure compensated dripper and drip irrigation terms and definitions, classification and labeling, materials, requirements, test Inspection methods, inspection rules and signs, packaging, transportation, storage.

This section applies to the flow or pressure regulator dripper and polyolefin-based drip irrigation pipe preparation.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 2828.1-2012 Sampling procedures for inspection - Part 1 - Batch-by-lot inspection by acceptance quality limit (AQL) plan

GB/T 2918-1998 plastic sample conditioning and testing of the standard environment

GB/T 8804.3-2003 Determination of tensile properties of thermoplastic pipe - Part 3 Polyolefin pipes

Plastics piping systems - Determination of dimensions of plastic parts

GB/T 13021-1991 Polyethylene pipe and fittings - Determination of carbon black content (TG method)

GB/T 15819-2006 Irrigation polyethylene (PE) pipe by the plug-in pipe caused by environmental stress cracking resistance test side Law and technical requirements

GB/T 16422.2-2014 Plastics - Laboratory exposure test methods - Part 2: Xenon arc lamps

Technical specifications and test methods for drippers and drip irrigation pipes for agricultural irrigation equipment GB/T 17187-2009

GB/T 18251-2000 Polyolefin pipes, fittings and mixed materials Determination of pigment or carbon black dispersion

Thermoplastics pipes, fittings and valves - Generic terminology and their definitions GB/T 19278-2003

GB/T 19466.6-2009 plastic differential scanning calorimetry (DSC) Part 6: Oxidation induction time (isothermal OIT) and oxygen Induction of temperature (dynamic OIT) determination

Plastic water - saving irrigation equipment - Part 1: Single wing labyrinth drip tape

Standard Test Method for Hydraulic Basic Parameters of Water Saving Irrigation Equipment

3 Terms and definitions

GB/T 17187-2009, GB/T 19812.1-2017, GB/T 19278-2003 as defined by the following terms and definitions apply In this paper.