GB/T 5917.1-2008Determination for feed particle size - Two-sieve screening method (English PDF)

Foreword

GB/T 5917 "Determination for feed particle size" contains two parts, Part 1 is the "Two-sieve screening method", and Part 2 is the "Geometric average particle size method".

This part is Part 1 of GB/T 5917.

This Part replaces GB/T 5917-1986 "Determination for formula feed particle size".

Compared with GB/T5917-1986, the main changes in this part are as follows:

--- The name of the standard is changed to "Determination of feed particle size - Two-sieve screening method";

--- A foreword is added;

--- The scope of application of the standard is expanded to compound feeds, concentrated feeds, concentrate supplements, additive premix feeds, single feeds, feed additives, etc.;

--- GB/T 6005, GB/T 6003.1, and GB/T 14699.1-2005 are cited;

--- It is stipulated that the quality of the test sieve shall meet the requirements of GB/T 6005 and GB/T 6003.1;

--- It is stipulated that "according to the quality requirements of different feed products and single feed, two standard test sieves of corresponding specifications, a blind sieve (bottom sieve), and a sieve cover shall be selected";

--- The amplitude, vibration frequency, and sieving movement mode of the electric vibrating sieve machine are specified;

--- The determination steps are modified and the working conditions of manual sieving are stipulated;

--- It is stipulated that the sieving method with an electric vibrating sieve machine is the arbitration method;

--- The requirement that the allowable error of the twice tests shall not exceed 1% is changed to "the error of twice tests of the mass of undersize material of the second-layer sieve shall not exceed 2%";

1 Scope

This part of GB/T 5917 specifies the two-sieve screening method for the determination of the particle size of feed pulverization.

This part applies to the determination of the crushed particle size of compound feed, concentrated feed, concentrate supplement, additive premixed feed, and single feed, and can also be used for the determination of the crushed particle size of feed additives.

2 Normative references

The provisions in the following documents become the provisions of this part through reference in this part of GB/T 5917. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this part, however, parties who reach an agreement based on this part are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies to this part.

GB/T 6003.1 Test sieves - Technical requirements and testing - Part 1: Test sieves of metal wire cloth

GB/T 6005 Test sieves - Metal wire cloth, perforated metal plate and electroformed sheet - Nominal sizes of openings

GB/T 14699.1-2005 Animal feeding stuffs - Sampling

3 Principles

The specified standard test sieves are used to sieve the sample on the vibrating sieve machine or manually, the mass of the material remaining on each layer of sieve is measured, and then its percentage in the total mass of the sample is calculated. […]

4 Instruments

4.1 Standard test sieve.