GB/T 22481-2008 English PDFUS$194.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 22481-2008: Cereals, oilseeds and pulses -- Measurement of unit pressure loss in one-dimensional air flow through bulk grain Status: Valid
Basic dataStandard ID: GB/T 22481-2008 (GB/T22481-2008)Description (Translated English): Cereals, oilseeds and pulses -- Measurement of unit pressure loss in one-dimensional air flow through bulk grain Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: B20 Classification of International Standard: 67.060 Word Count Estimation: 10,132 Date of Issue: 2008-11-04 Date of Implementation: 2009-02-01 Quoted Standard: GB/T 5518 Adopted Standard: ISO 4174-1998, IDT Regulation (derived from): National Standard Approval Announcement 2008 No.18 (Total No.131) Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China Summary: This standard specifies the determination of unidirectional airflow through the grain mass per unit pressure loss. It can be used to calculate the total pressure loss of the ventilation unit. Which is equivalent to the following several pressure loss and: a) (ventilation ducts, etc.) in the ventilation system, b) in the grain (the main content of this standard), c) from the pipe into the path of the grain pile. This standard applies to the determination of the pressure loss in the following range of flow velocity ventilation system. If the flow rate does not exceed the speed limit, the ventilation system pressure loss and airflow from ventilation ducts into the grain bulk channel pressure loss, relative to the grain heap in terms of pressure loss, negligible: -Main ventilation ducts speed 8m/s ~ 10m/s, -the speed of the ventilation duct 4m/s ~ 5m/s. GB/T 22481-2008: Cereals, oilseeds and pulses -- Measurement of unit pressure loss in one-dimensional air flow through bulk grain---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Cereals, oilseeds and pulses. Measurement of unit pressure loss in one-dimensional air flow through bulk grain ICS 67.060 B20 National Standards of People's Republic of China GB/T 22481-2008/ISO 4174.1998 Cereals, oilseeds and pulses of unidirectional flow through bulk grain Determination of unit pressure loss (ISO 4174.1998, IDT) Posted 2008-11-04 2009-02-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released ForewordThis standard is equivalent to ISO 4174 Implementation.1998 "cereals, oilseeds and pulses unidirectional flow through bulk grain loss measuring unit pressure" (English Chinese Version). This standard is equivalent translation ISO 4174.1998. For ease of use, the standard ISO 4174.1998 made the following editorial changes. a) "this International Standard" be replaced by "this standard"; b) use a decimal point instead of a decimal comma ",". ","; c) Remove international standards preface, introduction; d) with the GB/T 5518 "Inspection of grain and grain and oilseeds - Determination of relative density" instead of the original reference standard ISO 3507. 1976 "secret Meter. " Appendix A of this standard is an informative annex. The standard proposed by the National Food Authority. This standard by the National Standardization Technical Committee OILS. This standard was drafted. National Food Authority Standard Quality Center, Henan University of Technology. The main drafters of this standard. Limei Qin, Wu Chun-rong, CEREALS, Huai Tang Jian, Xie Huamin, Zhang Zhongjie. GB/T 22481-2008/ISO 4174.1998 Cereals, oilseeds and pulses of unidirectional flow through bulk grain Determination of unit pressure loss1 ScopeThis standard specifies the method for determination of unidirectional airflow through the grain bulk of unit pressure loss, which can be used to calculate the total pressure loss in the ventilation unit. Which is equivalent to the sum of the following several pressure loss. a) in the ventilation system (ventilation pipes, etc.); b) in the grain (the main content of this standard); c) from the pipe into the channel at the grain heap. This standard applies to the determination of the pressure loss of the gas flow rate in the following range of ventilation systems. If the flow rate does not exceed the following limits Speed, pressure loss in the ventilation system and airflow from the vent pipe into the grain heap passage pressure loss, the pressure loss with respect to grain heap Purposes, is negligible. --- Main ventilation duct velocity 8m/s ~ 10m/s; --- Sub ventilation duct velocity 4m/s ~ 5m/s; --- Into the grain bulk velocity 0.25m/s. This standard does not apply to the ventilation system airflow velocity greater than the speed limit above (eg. main pipe flow velocity reaches 30m/s), the case To calculate the pressure loss due to lower airflow distribution and discharge system caused.2 Normative referencesThe following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 5518 Inspection of grain and grain and oilseeds relative density measurement Principle 3 Function with the speed airflow into the grain mass per unit length of time to express generated when a uniform airflow through the grain mass (m) of the pressure loss. by Test to determine the curve, and then come airflow through the grain bulk formula unit pressure loss.4 Instrument4.1 Determination of unit pressure loss means Pressure loss measuring apparatus shown in Figure 1. The food into smooth wall of the cylindrical vessel, the outer wall of the container is equipped with two measuring 500mm apart Pressure port, each has two pressure taps and the inner diameter of the tube leading to food for the 1mm. On the base there is a pressure chamber and a fine sieve Network, measured grain stacked in a fine sieve online. Fan, pump or compressor air pressure to the buffer tank, and then into the air equipped with a needle valve of the pressure chamber. Needle valve can switch, In order to adjust the volume of gas passing through the grain. Measured by the air flow meter (e.g. rotameter). Pressure air into the meter before measuring gauge (such as U-tube manometer); 500mm thickness of the grain heap pressure loss with an accuracy ± 0.1Pa micro-pressure meter (precision manometer) measurements. 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