SH/T 0785-2006 Determination of burning persistence of fire-resistant liquid wick-type

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Card type: Test method

1. Method number / full name / English name / replacement relationship

• Standard number: SH/T 0785-2006
• Chinese name: Determination of burning persistence of fire-resistant liquid wick-type
• English name: Petroleum and related products — Determination of wick flame persistence of fire-resistant fluids
• Adoption relationship: Modified adoption of ISO 14935:1998 (MOD)
• Replacement relationship: not provided in the available source (the source only states "This standard was first published in 2006")
• Publication/implementation: published in 2006-05-12, implemented in 2006-11-01
• Proposed by/under the jurisdiction of/drafted by: proposed by China Petrochemical Corporation; under the jurisdiction of the Research Institute of Petroleum Processing, Sinopec Corp.; drafted by Jinan Branch of Sinopec Corp.; main drafters Qu Lanxiang, Yin Ting

2. Scope of application and non-applicability

• Scope of application: specifies the determination method for the burning persistence of the edge of non-combustible materials impregnated with fire-resistant liquid; can provide relevant information for safe transport and storage.
• Not applicable: cannot determine the spray performance of fire-resistant liquids; not applicable to certain water-containing liquids or emulsions that cannot adhere to the test board.

3. Method principle

A non-combustible aluminum silicate board impregnated with the test liquid is mounted in a liquid trough with its upper edge exposed. A small flame is used to ignite the exposed edge of the test board, and the burning persistence time after ignition ends is measured (in seconds). For five rounds of ignition tests, 6 determinations shall be carried out in each round. Calculate the burning persistence time of the five rounds of ignition tests, and take the maximum average as the test result.

4. Reagents and materials (purity / preparation)

• 5.1 Propane: meets the requirements for No. 95 industrial propane in SH/T 0553.
• 5.2 Cleaning materials: solvents for cleaning the specimen trough and suitable for the test materials.
• Test board material: non-combustible aluminum silicate material, width 25mm±1mm, thickness 2mm±0.2mm, cut to length 195mm±5mm (see 6.5).
• Note: The source mentions that Isoplan 1100 is a suitable material, and lists two purchase addresses (Frenzeit-Werke GmbH; Evco-S.A.).

5. Apparatus and equipment

• 6.1 Test trough: made of suitable metal, about 200mm long, 25mm wide, 20mm deep; equipped with clips or clamping devices, with the distance between the inner edges of the two clips being 180mm±2mm; each clip or clamping device has a reference scale at 30mm±0.5mm above the inner bottom of the test trough; see Figure 1 for the schematic diagram.
• 6.2 Burner: equipped with a nozzle of diameter 0.6mm, as shown in Figure 2.
• 6.3 Propane supply tube: made of gas-tight rigid or flexible material, with one end equipped with a swivel joint to connect to the burner, and the other end equipped with a regulating valve to connect to the propane gas source.
• 6.4 Test bench: suitable for mounting the test trough, test board and burner; use fixing components to fix the burner so that the flame height is at a suitable position; the surface of the test board can be moved to a safe position (see Figure 3).
• 6.5 Test board: non-combustible aluminum silicate material, width 25mm±1mm, thickness 2mm±0.2mm, length 195mm±5mm.
• 6.6 Soaking tank: a container made of suitable material, about 200mm long, 30mm wide, 40mm deep.
• 6.7 Timer: an electronic or mechanical stopwatch readable to 0.1s, with an error of ±0.1% between 0min~10min.

6. Recommended operating conditions

• Test environment: still air, room temperature 18℃~22℃ (9.1).
• Ignition flame length: 25mm±1mm, to be checked and adjusted if necessary for each determination (8.4).
• Ignition time: 2s±0.25s (9.5); the subsequent five rounds of ignition times are respectively 5s±0.1s (MP5), 10s±0.1s (MP10), 20s±0.1s (MP20), 30s±0.1s (MP30) (9.7).
• Time limit for completing the test: the five rounds of ignition tests shall be completed within 2h (9.8).
• Note: It is recommended to turn off the fume hood ventilation, or use a wind shield of sufficient length to shield three sides of the test bench (9.1 note).

7. Sampling and specimen preparation

• 7.1 Unless otherwise specified, sampling shall be carried out in accordance with GB/T 4756.
• 7.2 Before sampling, check whether the sample contains sediment and/or water; if so, separate by filtration or settling, and note it in the test report.
• Test board preparation (8.1): each test board is suspended vertically in still air, and the lower edge of the test board is ignited with a small flame; the flame should burn vertically to remove combustible substances from the entire test board; the test board shall be cooled for at least 1h before use.
• Note: It is recommended to prepare the test boards required for the test at the same time, and store the prepared test boards in a covered container.

8. Analytical procedure

• 8.2 Adjust the test bench so that the test trough is horizontal; fix the test board so that the board surface is vertical, the top of the board is horizontal, and it is in a straight line with the standard scale on the clips or clamping devices.
• 8.3 Burner ignition position installation: the center line of the nozzle is horizontal, parallel to the test board, and ±1.5mm from its top; the horizontal distance between the nozzle opening and the top of the test board along the length direction is 6.5mm±1.5mm; the ignition and movement of the burner nozzle shall be in a safe position.
• 8.4 Adjust the ignition flame length to 25mm±1mm, to be checked and adjusted if necessary for each determination.
• 9.1 Carry out the test under conditions of still air and room temperature 18℃~22℃.
• 9.2 Fill the soaking tank with test liquid to a depth of about 30mm, immerse the test boards required for one test, immersing at least 10min; discard the liquid after use. Note: At least 5 test boards are required for each test, and in some cases as many as 15 test boards are required.
• 9.3 Load the test trough with fresh specimen to a depth of 15mm±1mm, and maintain the liquid level throughout the test.
• 9.4 Use tweezers to carefully grip both ends of the test board (not exceeding 20mm from the two end points), take it out of the soaking tank and fix it on the clips or clamping devices of the test trough.
• 9.5 Drain the test board for 1min~5min, then ignite at the middle of the board for 2s±0.25s.
• 9.6 Remove the ignition flame, record the duration of the flame on the test board to the nearest 0.1s, recorded as T1. If the flame on the test board burns to the clip, record this phenomenon in the report, and do not carry out subsequent tests on the edge of this test board. If the flame on the test board extends within 20mm of the ignition position, carry out 2 additional ignition tests at 50mm to the left and right of the center point of the edge of the test board. If the flame crosses the previously burned part of the test board, discard this test result. Complete 6 test determinations.
• 9.7 Repeat steps 9.5 and 9.6 to carry out ignition tests at 5s±0.1s (MP5), 10s±0.1s (MP10), 20s±0.1s (MP20) and 30s±0.1s (MP30); all test boards used shall be drained for 1min~5min. Note: After the 1, 2 or 3 ignition test, the test board should be turned over for use.
• 9.8 This test requires the five rounds of ignition tests to be completed within 2h.

9. Qualitative and quantitative determination and calculation formula

• Calculate the average persistence time (MP) of each of the five rounds (MP2, MP5, MP10, MP20 and MP30) of ignition tests, in seconds: MP = (T1+T2+T3+T4+T5+T6)/6 ...... (1) Where: T1, T2, T3, T4, T5, T6 are the 6 measured values in clause 9.6.
• Expression of results: report the maximum average of the five rounds calculated in Chapter 10, to the nearest 0.1s, as the test result of the average burning persistence.
• Report the sediment and/or water observed in the sample in clause 7.2.
• Report the test phenomenon observed in clause 9.6 where the flame burns through the clips or clamping devices.
• Term 3.1 average burning persistence (flame mean persistence): under the conditions specified in this standard, the maximum average burning persistence time (in seconds) of five rounds of ignition tests; the result of each round of ignition tests is the average of six determination results.

10. Precision

• Original Chapter 12: This standard specifies the maximum value of 60s as the limit for pass or fail of the test; this method has not established precision.

11. Report

The test report shall include at least the following contents:

• a) State the citation of this standard;
• b) Type and complete number of the test product;
• c) Test results in Chapter 11;
• d) Differences from this test procedure caused by agreement or other circumstances;
• e) Test date.

12. Normative references

• GB/T 4756 Petroleum liquids — Manual sampling (GB/T 4756-1998, eqv ISO 3170:1988)
• SH/T 0553 Industrial propane and butane (SH/T 0553-1993, mod ISO 9162:1989)
• Note: The foreword of the source states that the citation of ISO 15029 "Petroleum and related products — Determination of spray ignition characteristics of fire-resistant fluids" was deleted from the normative references, and the related content was modified accordingly.

13. Source and verification

This page is an AI translation of the available Chinese method card. Human verification is pending. It is not an official translation of the standard. Check the source standard and product certificate before use.

14. Quick reference for questions and answers