GB/T 19812.1-2017Plastic equipment for water saving irrigation—Part 1: Drip tape with labyrinth on one side (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 and drip tape;

--- Part 4. Polyethylene (PE) branch pipe;

--- Part 5. Buried drip pipe.

This section GB/T 19812 Part 1.

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

This section instead of GB/T 19812.1-2005 "plastic water-saving irrigation equipment single-wing labyrinth drip tape" and GB/T 19812.1-2005, except for editorial changes outside the main technical changes are as follows.

--- The standard name was changed to "plastic water-saving irrigation equipment Part 1. Single-wing labyrinth drip tape";

--- Removed the last paragraph of "scope" "This section does not apply to other types of drip tape." (See Chapter 1, 2005 edition of the 1 chapter);

--- Normative references added GB/T 2918-1998, GB/T 18251-2000, GB/T 19278-2003, GB/T 19466.6-2009, SL571-2013 (see Chapter 2);

--- Removed the term "flow index", an increase of "rated working pressure" "nominal diameter" "nominal wall thickness" of the definition (see Chapter 3, 2005 edition Chapter 3);

--- Removed the "classification" chapter (see the 2005 edition of Chapter 4);

--- "Marking" chapter added "wall thickness" of the marking requirements, "Specifications. Nominal diameter (mm) × nominal wall thickness (mm) × Drip hole between (Mm) "(see Chapter 4, Chapter 5 of the 2005 edition);

--- "Material" added an added "manufacturing drip tapes should be made of polyethylene" "Do not use medical waste and toxic and harmful Recycled material produced by chemical packaging "" According to this part of polyethylene tape used in the production of raw materials can be added from the field Recycled recycled polyethylene tapes produced in accordance with this standard shall have the properties specified in this section, A "and other requirements (see 5.1, 5.4, 5.6);

--- Increased nominal wall thickness of "0.14mm" "0.30mm" and "0.40mm" three specifications (see 6.3.2, 2005 edition 7.2.2);

--- Modify "C" value and "Cv" value in "Flow Uniformity" requirement, "C" is changed to "Average flow q relative to rated flow qn (C) shall be within ± 7% "and" Cv "shall be amended to" shall not exceed 7% "(see 6.4. 7.3 of 2005);

--- Modify "the relationship between flow and inlet pressure" in the "Rq", revised to "the average flow curve of the flow rate relative to The rate of deviation (Rq) of the flow rate obtained from the plant curve should be within ± 7% "(see 6.5, 2005 edition 7.4);

--- Modify the "pull-resistant performance" in the load, revised to "should be able to withstand the required load" (see 6.9, 2005 version 7.8);

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

--- Increased the sample conditioning requirements "at a temperature of (23 ± 2) °C under the conditions of conditioning at least 24h." (See 7.2);

--- Modify the "flow and the relationship between inlet pressure" test method (see 8.5, 2005 version 8.6);

--- "Anti-sediment clogging performance" test method to increase the requirements of Table 4 on the sediment grading (see 8.6);

--- Pull-resistant performance test method adds Table 5, the test load is loaded by the nominal wall thickness of the product were classified (See 8.9);

--- Modify the "batch" program, revised to "each batch of 5,000 volumes"; seven days production was revised to "less than 5,000 volumes" (see 9.1, 2005 version 9.1);

--- Increase the "sampling plan" in the batch number N and the sample size n (see 9.2.2);

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

--- Increasing the "type test" decision rules (see 9.4.2);

--- Added an informative appendix "Polyethylene recycling materials performance" (see Appendix A).

1 Scope

GB/T 19812 provisions of this part of the single-wing labyrinth drip tape terms and definitions, marking, materials, requirements, samples and test strips Pieces, test methods, inspection rules, packaging signs, packaging, transport and storage.

This section applies to polyolefins as the main raw material, the use of extrusion blow molding, and the side of the vacuum mold with a drip hole and the flow was Labyrinth-type non-multiplex drip tape (hereinafter referred to as "drip tape"), the transmission medium temperature does not exceed 45 °C.

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 sampling inspection - Part 1: Sampling inspection by batch acceptance inspection by acceptance quality limit (AQL) plan

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

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

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

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

3 Terms and definitions

GB/T 17187-2009, GB/T 19278-2003 defined and the following terms and definitions apply to this document.