Skip to product information
1 of 6

PayPal, credit cards. Download editable-PDF & invoice In 1 second!

GB/T 31427-2015 English PDF (GBT31427-2015)

GB/T 31427-2015 English PDF (GBT31427-2015)

Regular price $140.00 USD
Regular price Sale price $140.00 USD
Sale Sold out
Shipping calculated at checkout.
Delivery: 3 seconds (Download full-editable-PDF + Invoice).
Quotation: Click GB/T 31427-2015>>Add to cart>>Quote
Editable-PDF Preview (Reload if blank, scroll for next page)

GB/T 31427-2015: Specification for determinator of coal ash fusibility
This standard specifies the technical requirements, test methods, inspection rules, marking and packaging, transport, and storage of determinators of coal ash fusibility. This standard applies to determinators of coal ash fusibility.
GB/T 31427-2015
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.040
D 21
Specification for determinator of coal ash fusibility
ISSUED ON: MAY 15, 2015
IMPLEMENTED ON: JULY 1, 2015
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Technical requirements ... 4
4 Inspection methods ... 7
5 Inspection rules ... 8
6 Identification and packaging ... 10
7 Transport and storage ... 11
Specification for determinator of coal ash fusibility
1 Scope
This standard specifies the technical requirements, test methods, inspection rules, marking and packaging, transport, and storage of determinators of coal ash fusibility (hereinafter referred to as determinator).
This standard applies to determinators of coal ash fusibility.
2 Normative references
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard.
GB/T 191 Packaging—Pictorial marking for handling of goods
GB/T 219 Determination of fusibility of coal ash
GB/T 2828.1 Sampling procedures for inspection by attributes -- Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 4793.1 Safety requirements for electrical equipment for measurement, control, and laboratory use—Part 1: General requirements
GB/T 13384 General specifications for packing of mechanical and electrical product GB/T 15479 Technical requirements and test methods of insulation resistance and insulating strength for use in industrial process measurement and control instruments GB/T 30726 Determination of ash fusibility of solid biofuels
3 Technical requirements
3.1 Type and structure of the determinator
The coal ash fusibility determinators include the testers that manually monitor and determine the shape change of the sample, and the testers equipped with an observation recorder that can automatically record the shape change of the sample. The performance shall comply with the relevant provisions of GB/T 219.
heated according to the procedures specified in GB/T 30726: when the temperature is below 700 °C, the heating rate is 15 °C/min~20 °C/min; when the temperature is above 700 °C, the heating rate is 4 °C/min~6 °C/min.
3.4.4 The atmosphere in the furnace can be controlled as a weak reducing atmosphere or an oxidizing atmosphere.
3.4.5 If adopting the carbon sealing method, the manufacturer should use the furnace tube of the same variety and specification, and provide a reference method for carbon sealing to control the weak reducing atmosphere in the furnace.
3.4.6 There shall be an observation port, through which the shape changes of the sample during the test can be clearly observed.
3.4.7 Temperature of the shell: when the high-temperature furnace works, the shell’s temperature shall be not more than 70 °C; there shall be a high-temperature warning sign.
3.5 Temperature controller
3.5.1 The temperature measurement range shall be 0 °C~1500 °C, and the resolution shall be 1 °C.
3.5.2 The temperature measurement error shall be not more than 5 °C.
3.5.3 The heating rate can be controlled according to 3.4.3.
3.6 Observation recorder
3.6.1 The temperature change during the test and the shape change of the sample at the corresponding temperature can be recorded truthfully.
3.6.2 The test process with a real-time temperature display can be played back. 3.6.3 The test process can be monitored manually.
3.7 Appearance requirements
The metal coating and chemically treated surface shall be uniform in color; there shall be no exposed bottom, peeling, blistering, spots, scratches, or scuffing; it shall have good anticorrosion and anti-rust performance.
3.8 Insulation resistance and dielectric strength
The insulation resistance between the power terminal of the independent power supply part and the casing of the determinator shall not be less than 20 MΩ. It shall be able to withstand 1500 V, 50 Hz AC for 1 min, without arcing and breakdown.
4 Inspection methods
4.1 High-temperature furnace
4.1.1 Determination of the maximum heating temperature: the high-temperature furnace shall be heated to the maximum temperature according to the heating program, which shall meet the requirements of 3.4.1.
4.1.2 Determination of the constant temperature zone: control the furnace temperature at 1000 °C, keep the temperature constant for 10 min, and use another set of standard platinum-rhodium platinum thermocouple pyrometers to determine the location and area of the constant temperature zone in the high-temperature furnace; the constant temperature zone shall meet the requirements of 3.4.2.
4.1.3 Determination of the heating rate: turn on the power of the high-temperature furnace, heat up to the maximum temperature according to the heating program, and record the temperature every 5 minutes through the temperature indicating instrument. Calculate the heating rate before and after 900 °C or 700 °C, and the average heating rate within each 10 min shall meet the requirements of 3.4.3.
4.1.4 Inspection of the atmosphere: The atmosphere in the furnace shall be inspected according to the provisions of GB/T 219, which shall meet the requirements of 3.4.4. 4.1.5 Inspection of the observation port: Observe the shape change of the sample from the observation port by visual inspection, which shall meet the requirements of 3.4.6. 4.1.6 Determination of shell’s temperature: Raise the temperature in the furnace to 1500 °C, and measure the temperature in the middle of the shell of the high-temperature furnace according to the provisions of GB 4793.1, which shall be meet the requirements of 3.4.7.
4.2 Temperature controller
4.2.1 Determination of the temperature control range and the heating rate: Measure it according to 4.1.1 and 4.1.3, and the results shall meet the requirements of 3.5.1 and 3.5.3.
4.2.2 Determination of the temperature measurement error: the high-temperature furnace shall be heated according to the heating program; when the temperature is at 700 °C, 800 °C, 900 °C, 1000 °C, 1100 °C, 1200 °C, 1300 °C, 1400 °C, and 1500 °C, use another set of standard platinum-rhodium platinum thermocouple pyrometers to determine the temperature in the furnace chamber of the high-temperature furnace, and the determined position shall be as close as possible to the thermocouple of the instrument. The difference between the displayed temperature value of the temperature controller and the measured temperature value shall meet the requirements of 3.5.2. the manufacturer according to the factory inspection items specified in Table 1. Only after being examined as qualified and getting a certificate can the determinator leave the factory.
5.3 Type inspection
5.3.1 Type inspection rules
Type inspection shall be carried out when one of the following situations happens: a) Appraisement is carried out for the new product being put into production or the old product being transferred to another factory;
b) After the official production, there are major changes in the structure, material, and process, which may affect the performance of the product;
c) The production is resumed again after it has been stopped for more than 2 years; d) Type inspection is carried out once every 2 years during the mass production; e) There is a big difference between the factory inspection results and the last type inspection;
f) The national quality supervision agency puts forward the requirements for type inspection.
5.3.2 Sampling rules
According to GB/T 2828.1, sample from the finished products that have passed the factory inspection:
a) When the number of a batch does not exceed 25, take 2 samples;
b) When the number of a batch is 26~90, take 3 samples.
5.3.3 Judgment rules
According to the results of the sample inspection (the first sampling), if all the inspection items are qualified, the batch of products can be judged as qualified products. When the number of a batch is not more than 25, if the number of unqualified products from the first sampling is greater than 0 and less than 2, 2 sets shall be randomly selected as the samples of the second sampling according to 5.3.2 for re-examination. If the total number of unqualified products from twice samplings is less than 2, the batch can be judged as qualified; otherwise, it is unqualified. When the number of a batch is 26~90, if the number of unqualified products from the first sampling is greater than 0 and less than 3, then select 3 more sets as the samples of the second sampling according to 5.3.2, and repeat the inspection. If the total number of unqualified products from twice
View full details