Professional Standard of Entry-Exit Inspection and Quarantine of the People’s Republic of China
SN/T 2771—2011
Procedure of Ship Fumigation on Import Logs
| Issue Date: February 25, 2011 |
Implementation Date: July 1, 2011 |
| Issued by General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
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Foreword
This standard is drafted in accordance with the regulations given by GB/ T 1.1-2009.
Please note that some of the contents of this document may involve patent issues. The issuer of this document is not responsible for identifying these patents.
This standardwas proposed by and is under jurisdiction of Certification and Accreditation Administration of the People’s Republic of China.
This standard was drafted byJiangsu Entry-Exit Inspection and Quarantine Bureau of the People's Republic of China, and Tianjin Entry-Exit Inspection and Quarantine Bureau of the People's Republic of China.
This standardwas mainly drafted by Gu Zhongying, Yang Guang, Wu Jianbo, Gu Jie, Wu Xinhua, Ji Jianqing, Zhang Ruifeng.
Procedure of Ship Fumigation on Import Logs
This standard specified the basic requirements for fumigation of imported logs using methyl bromide or sulfuryl fluoride, pre-fumigation preparation, fumigation operation, safety measures and effect assessment.
This standard is applicable to fumigation of importing logs in ship cargo spaces using methyl bromide or sulfuryl fluoride.
The following documents are essential for the application of this document. For dated references, only the date noted version referred to applies. For undated references, the latest edition (including all modifications) of the documents referred to applies.
GB 434 Methyl Bromide Technical
GB 7796Diagnostic Criteria and Principles of Management of Occupational Acute Methyl Bromine Poisoning
SN/T 1760Codes for Sanitary Treatment with Sulfuryl Fluoride at Entry and Exit Ports
For the purpose of this standard, the terms and definitions given in the following apply.
3.1
Fumigation
A technique or method for killing pests at a certain time and in an airtight space by means of fumigants under atmospheric or vacuum conditions.
3.2
Ship Fumigation
In ships, fumigation of cargo in cargo spaces, decks or empty cargo spaces is collectively referred to as ship fumigation.
3.3
Fumigant
A chemical agent that producesa concentration of gas that is lethal to a pest at the required temperature and pressure. The fumigants of this standard refer to methyl bromide and sulfuryl fluoride.
3.4
Pest
Any biological organism that damages or may harm plants or plant products.
3.5
Threshold Limit Value; TLV
The maximum permissible concentration of toxic gases in the air that the operator has been exposed to repeatedly for a long period of time without causing any harm to human health in a given working space. The long-term exposure safety threshold of methyl bromide was 2 mg/ m3 (working time was calculated as 8 h/ d and 40 h/ week) and that of sulfuryl fluoride was 20 mg/ m3.
3.6
Aerate
The process that natural or mechanical ventilation is used to gradually reduce the concentration of fumigation gas in fumigation space until the concentration of fumigation gas is reduced below the safety threshold.
It shall pass the examination organized by the General Administration of Quality Supervision, Inspection and Quarantine, and have the qualification to engage in ship fumigation business.
It shall pass the inspection and quarantine organization ship fumigation business training, and obtain the quarantine treatment professional qualification certificate.
The quality of methyl bromide should meet the requirements of GB 434, and its effective content should not be less than 98%; the effective content of sulfuryl fluoride should not be less than 98%. They shall all be qualified products of manufacturers with three licenses (industrial and commercial business license, production license and pesticide registration certificate).
4.4 Fumigation Instruments
4.4.1 Fumigation gas detection instrument
Fumigation gas concentration detector (detection accuracy is 0.1g/m3), gas chromatograph (detection accuracy is 0.01g/m3), halogen lamp and bromine gas detection tube (detection range is 5mL/m3 to 50mL/m3 and 10g/m3 to 100g/m3).
4.4.2 Temperature measuring instrument
Digital thermometer (temperature range -100℃ to 1000℃, accuracy 0.1℃) or mercury thermometer (temperature range 0℃ to 100℃, accuracy 0.1℃).
The fumigant was vaporized by water bath heating, and the outlet temperature of the vaporizer was not less than 20 ℃.
The tent used in the course of fumigation, the tent should have good airtightness. The thickness of the air-tight film made of polyethylene, polypropylene, polyvinyl chloride is 0.2 mm to 0.25 mm.
4.4.5 Paste and sealing materials
Paste, high-strength paper, kraft paper, tape, asphalt tape, asphalt glue, flexible material, PVC film with the thickness of 0.15mm above.
4.4.6 Safety protection equipment
Full-face filter type gas mask, isolation type air breathing device or positive pressure oxygen generator (worn in high concentration environment), dust mask, protective gloves, safety helmet, work clothes and life vest, etc.
4.4.7 Other fumigation equipment
Fan, drug delivery pipe (high pressure oxygen pipe not easy to be corroded), dispenser (error is less than 25g/kg), gas sampling tube (inside diameter is 3mm to 5mm), cylinder nozzle, scale or electronic scale (weighing range is 0kg to 150kg, sensitive quality is 0.1kg), calculator, tape, scissors, wrench, flashlight, first aid medicine, fumigation safety notice, fumigation notice sheet, warning sign and communication tool, etc.
4.5 Ship
The cargo holds, engine rooms and living areas are completely isolated; the cargo space is well air-tight and equipped with ventilation facilities that can operate normally.
5.1 The fumigation institution shall determine the fumigation operator and the person in charge of the fumigation operation, submit the fumigation notice to the captain in conjunction with the shipping agent company and other relevant departments, and confirm the fumigation matters with the vessel (agreed fumigation plan, fumigation safety measures and responsibilities of the ship).
5.2 The fumigation operator examines the hull structure, including carbon dioxide pipelines, ground axles, engine room areas, sewage valves, cable holes, high and low duct mechanical ventilators, manhole, mast house, mast house cable holes, hatch cover rubber padding, anchor chain, living area, etc., and records the investigation conditions into the Record of Hull Structure Inspection and Treatment Table; asks for stowage plan, gets to know the source, quantity, type and loading position of logs, measures cabin temperature, understand the species of pests, harmful parts and infection conditions, etc.
5.3 The fumigation institution shall determine whether it is suitable for fumigation according to the inspection of the ship and the loading condition of the cargo. If suitable for fumigation, the fumigation plan and operation plan are formulated. The scheme should include the starting and ending time of fumigation, the dosage, the position and method of administration, the sealing position and method, the position of gas sampling tube, the sealing time, the test plan of the concentration of fumigant in the cabin, the monitoring plan of the concentration of fumigant in the living area and the engine room, the time and method of dispersing poison, and the safety measures. If not suitable for fumigation, the result of fumigation suitability test shall be informed to the shipper and his agent.
5.4 The inspection and quarantine institution shall approve the fumigation scheme and operation plan.
5.5 Fumigation institutions prepare fumigantand fumigation instruments.
5.6 The fumigation institution shall deliver the fumigation plan and operation plan to the frontier inspection and maritime departments, and handle the procedures related to boarding fumigation.
6.1 Determine Fumigation Temperature
6.1.1 The temperature in the cabin and the ambient temperature shall be determined by a thermometer. When the temperature in the cabin is below 5 ℃, it shall not be suitable for fumigation.
6.1.2 If the ambient temperature is lower than 5 ℃ (including 5 ℃) or higher than the cabin temperature, the cabin temperature shall be taken as the fumigation temperature of the cargo in the hold; if the ambient temperature is lower than 5 ℃, the average temperature of cabin temperature and ambient temperature shall be the fumigation temperature of the cargo in the hold.
Position the fan diagonally on the cargo. The total air volume of the fans should be equal to the total fumigation volume. If the total fumigation volume is larger, you can properly increase the number of fans. If the cabin has two or three floors, fans should be installed on each deck.
The sampling pipes are arranged on the upper, middle and lower layers of the cargo, each layer 3 to 4 sampling pipes shall be arranged in diagonal order; if the volume of fumigation is larger, the number of sampling pipes should be increased appropriately. After the sampling pipe is arranged, mark it well.
6.4 Layout of Drug Delivery Tubes
Each layer of the top, middle and lower layers of the cargo shall be arranged 1 to 2 drug delivery tubes in front of the fans and fixed, and then the drug delivery tubes are connected to the dispenser and then to the vaporizer.
6.5 Calculation of Fumigation Volume and Dosage
The volume of fumigation shall be determined by the volume of empty hold space, and the dosage shall be the volume of cargo space multiplied by the amount of fumigant. Fumigation doses of methyl bromide and thionyl fluoride into logs were given in accordance with Appendix A.
6.6 Fumigation Sealing and Preparation before Drug Delivery
6.6.1 High strength paper and kraft paper paste seal are used to connect with fumigation chamber; PVC film can be used to bind manhole, overflow hole, sewage wellhead and air cylinder mouth, etc.; asphalt tape, asphalt glue or flexible material are used to seal the hatch cover or door, and PVC film can be used to cover and bondthem when it can not be sealed. Check sealing condition after pasting and sealing.
6.6.2 When the hatch cover can not be closed or there is a large gap in the course of cabin cargo fumigation,it shall be covered by the tent, and the surrounding area of the tent shall be compacted with sandbags and water bags, and the tent shall be secured by wind-proof nets and wind-proof fixed ropes.
6.6.3 Post a warning sign at an obvious location in the fumigation area and ask the ship to fly the “VE” flag during the day and turn on the “green-red-green” signal light at night.
6.7 Drug Dispersion
6.7.1 Turn on the fans: The fan is generally used during dosing and within 30 min after dosing. The fans can continue to run until the fumigation gas is evenly distributed when the volume of the cabin is larger or when the log loading is quite full.
6.7.2 When the vaporizer is opened, it delivers drugs at a rate of 1 kg to 2 kg per minute. After delivering 5 kg to 10 kg, wait 30 min to check if there is gas leakage. If there is no leakage, continue to use drugs. Otherwise, make up the leak.
6.8 Concentration and Leakage Detection
6.8.1 The concentration of fumigant at each test point in the cabin was measured by fumigation gas concentration detector at 0.5 h,2 h,4 h,8 h,12 h and 16 h after dispersing drugs respectively. Turn off the fans or ventilator when the cabin concentration tends to be consistent.
6.8.2 Decide whether to add the reagent or prolong the fumigation time according to the result of the concentration test. If the concentration in cabin is lower than the prescribed standard within 5g/ m3, the sealing time shall be prolonged for 8 hours to 12 hours; if the concentration is between 5g/ m3 and 8g/ m3, the dosage shall be calculated according to the formula, and the fumigation time shall be extended for 8 hours to 12 hours; if the concentration is above 8g/ m3, the fumigation shall be re-carried out.
in the above formula:
A-Supplementary dosage, in kilograms (kg);
B-The difference value between the actual concentration_and the specified concentration, in grams per cubic meter (g/ m3);
C-The volume of fumigation space, in cubic meters (m3);
k-Cargo fumigation coefficient, log is 2.0.
6.8.3 At the end of 0.5 h,1 h,2 h,3 h,4 h and every 2 h thereafter, the personnel on duty on board the ship shall inspect the fumigation area, the machinery space and the living area for leakage, and if the concentration of fumigantexceeds the safety threshold, they shall evacuate the personnel to the safety area in time, and find and seal up the leak. Safety and first aid of methyl bromide shall be conductedto comply with the requirements of GB 7796. Safety and first aid of sulfuryl fluoride are performed in accordance with SN/ T 1760.
6.9 Aeration
6.9.1 If the fumigation effect is achieved by concentration test, notify the ship to close the living area doors and windows and ventilation devices, open the windpipe and manhole, and open the ventilators for mechanical ventilationfor more than 3 hours or natural ventilation for more than 6 hours, then open the hatch cover. Dispersion of poison should follow the principle of first downwind and then upwind.
6.9.2 During the aeration, inspect concentration of methyl bromide or sulfuryl fluoride in cargo spaces, living areas and machinery rooms was detected at 2 hours,4 hours and 6 hours after the opening of thecabin, until the concentration of methane bromidebelow 5 × 10-6 or 0.02g/ m3 or sulfuryl fluoride was reduced to 0.02g/ m3 at all test points.
6.9.3 During the aeration, the ship was required to fly the “BO” flag during the day and turn on the “green-red-red” signal lights at night.
6.9.4 After the aeration, remove the fumigation warning sign and remove the relevant fumigation signal.
7 Assessment of Results
7.1 After the fumigation operation, the fumigation operator shall fill out the fumigation report accurately. Inspection and quarantine personnel shall evaluate the fumigation effect according to the requirements of Appendix A.
7.2 The fumigation method and technical index shall conform to the fumigation plan and requirements approved by the inspection and quarantine authorities, and the safety measures shall be assessed as qualified; if the fumigation method does not meet the fumigation plan requirements, if the technical index fails to meet the requirements or the safety measures are not implemented, then the fumigation shall be determined as unqualified.
Appendix A
(Normative appendix)
Methyl Bromide or Sulfuryl FluorideIndexesof Fumigation for ImportedLogs
Table A.1 Methyl Bromide Indexes of Fumigation for Imported Logs
| Fumigation temperature ℃ |
Initial concentration g/m3 |
Sealing time h |
Concentration in the course of aeration g/m3 |
| 5 ~ 15 |
120 |
16 |
≥ 36 |
| More than 15 |
80 |
16 |
≥ 24 |
Table A.2 SulfurylFluoride Indexes of Fumigation for Imported Logs
| Fumigation temperature ℃ |
Initial concentration g/m3 |
Sealing time h |
Concentration in the course of aerate g/m3 |
| 5 ~ 10 |
104 |
24 |
≥ 31.2 |
| More than 10 |
80 |
24 |
≥ 24 |
(All information in this document is authentic in Chinese. English is provided for reference only. In case of any discrepancy, the Chinese version shall prevail.)
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