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National Standard of the People's Republic of China
Marine explosion-proof type axial flow fans
Marine explosion-proof type axial flow fans1 Subject content and scope of application
GB 11800--89
This standard specifies the product classification, technical requirements, test methods and inspection rules of marine explosion-proof axial flow fans (hereinafter referred to as "explosion-proof fans").
This standard is applicable to explosion-proof fans for extracting flammable and explosive mixed gases or steam from oil tanks, cargo holds, pump rooms, battery compartments, ammunition compartments, hangars, paint rooms and other places on ships. It is also applicable to explosion-proof fans for extracting dangerous gases from various departments on land. This standard is also applicable to explosion-proof fans for ventilation and air exchange in other cabins of ships and various departments on land.2 Reference standards
GBn193 General technical conditions for packaging of mechanical and electronic instruments and meters for export GB191
GB 985
Packaging, storage and transportation pictorial symbols
Basic types and dimensions of manual arc welding joints GB 1236
Test methods for aerodynamic performance of ventilators
GB1804
GB2888
Tolerances and fits Limit deviations of dimensions without tolerances Measurement methods for noise of fans and Roots blowers GB 3836. 1
General requirements for explosion-proof electrical apparatus for explosive atmospheres GB 3836. 2
Explosion-proof electrical apparatus for explosive atmospheres Flameproof electrical apparatus "d" GB5117 Carbon steel welding rods
CB 884
Technical conditions for aluminum alloy casting
JB2759General technical conditions for packaging of electromechanical products3 Product classification
3.1 Basic type
3.1.1 Explosion-proof ventilators are single-stage, vertical or horizontal structures. They can also be made into a common vertical and horizontal type. 3.1.2 The explosion-proof type and grade of explosion-proof ventilators are: dIIBT4. That is, flameproof type, Class I electrical equipment, suitable for Class B explosive gas mixtures with maximum safe gap or minimum ignition The current ratio, the highest surface temperature is T4 group. 3.1.3 Explosion-proof ventilators are divided into three basic structural types: Type 1 (deck type), Type II (pipe type) and Type IIII (compartment type) (see Figure 1 and Figure 2). The impellers of Type I and Type II are directly installed on the shaft of the explosion-proof motor. The State Technical Supervision Bureau approved 616 on November 21, 1989. The foreign standard industry information is free of charge. Implementation on July 1, 1990. Type 1 (deck type) GB 11800--89
Jingniu support
1--Casing; 2-Impeller, 3--YB-H explosion-proof motor: 4-Deflector, 5-Frame; 6-Wind cap
ⅡI type (pipeline type)
Bulkhead
II type (bulkhead type)
1-Explosion-proof fan; 2 Transmission device; 3-Sealing stuffing box; 4-Flexible coupling 3.1.41 type (deck type) with wind cap, explosion-proof motor installed on the upper part of the frame, frame circumference with 25.4mm (1 inch) 2 mesh stainless steel wire mesh protection, vertical installation on the deck can be used for exhaust or air supply. 3.1.5I type (pipeline type) without wind cap, explosion-proof motor installed inside the casing, fixed with stationary blade support and casing. It can be installed vertically or horizontally in the pipeline, or on the deck, and can be used for exhaust or air supply. 3.1.6 Type II (compartment type) is a structure in which the explosion-proof ventilator and the motor are separated into compartments, and is composed of an intermediate transmission device, a sealed stuffing box and a flexible coupling, etc., and is only used for exhaust.
Standard manufacturing parts
GB11800—89
The impeller part of the explosion-proof ventilator is fixed with a safety ring made of brass to prevent the impeller and the casing from rubbing against each other and generating fire. 3. 1. 7
The explosion-proof ventilator is structured such that the impeller rotates clockwise when viewed from the end of the explosion-proof motor. 3. 1.8
3.1.9 The explosion-proof ventilator can be equipped with a 50Hz or 60Hz, YB-H series explosion-proof marine three-phase asynchronous motor. 3.2 Basic parameters
The basic parameters of explosion-proof fans are represented by flow rate and static pressure, and the combination of the two parameters is represented by "△". 3.2.1
The parameters when equipped with a 50Hz explosion-proof motor are shown in Table 1. Table 1
24 000
27 000
100000
Pressure, Pa (mmH, 0)
Note: The parameters in the table are standard air intake conditions, that is, the atmospheric pressure is 101.33kPa, the temperature is +20℃, the relative humidity is 50%, and the density is 1.2kg/m3. 3.2.3 The basic parameters when equipped with 60Hz explosion-proof motors are shown in Table 2.618
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24 000
42 000
72 000
100000
120000
GB 11800—89
（40）
Pressure, Pa (mmH20)
Note: The parameters in the table refer to the standard intake conditions, i.e., the atmospheric pressure is 101.33 kPa, the temperature is +20℃, the relative humidity is 50%, and the density is 1.2 kg/m3. 3.3 Product Marking
3.3.1 The marking of explosion-proof ventilators consists of product name, technical characteristics and standard number. The format is as follows: XX-XX
Motor frequency:
Static pressure, Pa
50Hz omitted
60Hz represented by (60)
Flow rate, 10-2m/h
Structural type: I deck type
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Pipeline type
Bulkhead type
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3.3.2 Marking example
GB 11800—89
Flow rate 27000m2/h, static pressure 490.4Pa (50mmH20), equipped with 50Hz deck-type marine explosion-proof axial flow fan, marked as: explosion-proof fan 1270-490.4GB11800—894 Technical requirements
4.1 The overall structure of the explosion-proof fan should be a spark-free structure. 4.2 The explosion-proof fan should be equipped with a flameproof motor and starter that meets the requirements of GB3836.2 and has been inspected and qualified by a nationally recognized explosion-proof testing unit and ship inspection agency.
4.3 The trouble-free operation time of the explosion-proof fan should not be less than 8000h. 4.4 The explosion-proof fan should be able to work safely and reliably under the following conditions: in the cabins and places with explosive mixture gases of Class IB T4 group specified in GB3836.1 and GB3836.2; a.
b. It can transport mixed gases or steam containing flammable and explosive gases, but the hard particles in the mixed flammable and explosive gases are not allowed to exceed 150mg/m2 and the diameter is not greater than 2mm; c.
It can transport marine air containing salt mist and corrosive air containing oil mist; temperature: -25～+50℃;
Relative humidity is not greater than 95%;
Tilting and longitudinal pitch are 10° each;
Tilting is 15° each, rolling is ±22.5° (±45° in special occasions); g.
h. Vibration;
i. Impact.
4.5 The pressure value of the explosion-proof fan at rated flow should not exceed ±10% of the specified value. 4.6 The impeller should be statically and dynamically balanced. The dynamic balance accuracy should not be lower than G6.3 level. The specific sound pressure level of the explosion-proof fan at the specified flow should not be higher than 35dB(A). 4.7
4.8 The vibration speed of explosion-proof fans should not exceed 6.5mm/s. 4.9 The steel parts of explosion-proof fans should be galvanized. For larger sizes, other anti-corrosion measures such as pickling are allowed. 4.10 The inner and outer surfaces of explosion-proof fans should be painted with secondary marine paint. Before applying the topcoat, the base layer must be rust-free and coated with secondary primer. The surface should be smooth and tidy, and defects such as flow marks, blistering, peeling and scratches are not allowed. 4.11 The materials of the main parts and components of explosion-proof fans shall be as specified in Table 3. Other materials with seawater corrosion resistance and mechanical properties not lower than those specified in Table 3 are allowed.
Parts Name
Case, frame, hood, air duct
Safety ring
Air deflector
Q235-A
Standard number
GB1173
GB2060
GB3193
All parts made of aluminum alloy must comply with the provisions of GB3836.2, and the magnesium content shall not exceed 0.5% (weight ratio).
The tolerance of the overall dimensions of explosion-proof fans shall not be less than that specified in Js17 of GB1804. 4.14 The hole spacing tolerance of the holes drilled on the inlet and outlet flanges of explosion-proof fans shall not be greater than ±0.5mm. 4.15 The runout at the outer diameter of the impeller shall not be greater than that specified in Table 4. 620
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Impeller Diameter
Radial Circular Runout
GB 11800—89
500~800
>800～1 200
4.16 The tolerance of the chord length at the outlet end of any three adjacent blades of the impeller shall not be greater than that specified in Table 5. Table 5
Impeller diameter
Number of blades greater than 10
Number of blades less than 10
500~800
4.17 Technical requirements for impeller castings shall comply with the relevant provisions of CB884. 4.18
Surface shape and position tolerances of casing and frame shall not exceed the provisions of Table 6. Table 6
Impeller diameter
Radial tolerance
Parallelism of two flanges
500800
Basic types and dimensions of welded joints shall comply with the requirements of GB985. 4.20
Welding rods that comply with the provisions of GB5117 shall be used for welded parts. >800～1 200
>8001 200
>1 200~1 600
>1 200～1 600
>1 200~1 600
The surface of the welded part should be flat. The weld should be cleaned after welding and the deformation should be corrected. No defects such as leakage, burn-through, cracks, and incomplete penetration are allowed. 4.21
The diameter of a single pore in the weld should be less than 1mm. The number of pores in a 100mm long weld should be less than 5, and the spacing should be greater than 5mm. The gap of the riveted parts shall not be greater than 0.1mm within the range of twice the rivet diameter, and shall not be greater than 0.3mm in other parts. 4.224
The rivet head should be smooth and flat, and no loose rivets, skewed rivet heads, cracks, or loose rivets are allowed. 5 Test method
5.1 Impeller dynamic balancing correction
5.1.1 The impeller should be dynamically balanced on a dynamic balancing machine during the production process. 5.1.2 Balance correction can be done by adding balancing weights or removing weights. The balancing weights must be firmly fixed to the hub of the impeller, and no more than two pieces should be on the same correction surface. Weight removal should be done at the hub, but it should not affect the strength of the impeller. 5.2 Impeller overspeed test
The impeller should be operated for 10 minutes at a speed 20% higher than the rated speed. After operation, check the blades and hub for cracks and damage. Check whether the rivets of the balancing weights are loose. The dimensional deformation is calculated according to the following formula and should not be greater than 0.5/1000. Dimension deformation -
5.3 Operation test
Dimension before test - Dimension after test
× 100%
Dimension before test
After the explosion-proof fan is powered on, it should run for 10 minutes. There should be no abnormal phenomena such as scratching, abnormal noise and violent vibration. 5.4 Self-excited vibration measurement
The explosion-proof fan runs near the rated working condition, and the vibration speed (RMS value) of the casing flange in the three directions of up and down, left and right, and front and back is measured. 5.5 Aerodynamic performance test
It is carried out in accordance with the provisions of GB1236.
5.6 Noise test
It is carried out in accordance with the provisions of GB2888.
5.7 Explosion-proof test
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GB 11800-89
5.7.1 The first explosion-proof ventilator of a series of products must be subjected to explosion-proof test by a nationally recognized explosion-proof testing unit. 5.7.2 Each type of explosion-proof ventilator of a series of products must pass the product explosion-proof inspection by a nationally recognized explosion-proof testing unit and obtain an explosion-proof certificate.
5.8 Marine condition test
5.8.1 The explosion-proof ventilator shall be rigidly fixed on a special test bench in a similar installation method to that on a ship. During the test, the explosion-proof ventilator shall operate normally, and there shall be no abnormal phenomena such as scratching, abnormal noise and severe vibration. 5.8.2 Tilt and swing test:
5.8.2.1 Based on the rotating axis of the explosion-proof fan, the explosion-proof fan shall be tested in the following order from the plumb line: a.
Pitch 10° front and back, test time not less than 15min; pitch 15° left and right, test time not less than 15min; pitch ±10°, swing period 3~7s, test time not less than 30min; roll ±22.5°, swing period 5~~10s, test time not less than 30min. 5.8.2.2 In special occasions, the roll amplitude is ±45°. 5.8.3 Environmental vibration test:
The explosion-proof fan shall be tested for vibration response according to the parameters in Table 7. That is, in the entire frequency range, from low to high, and then from high to low 5.8. 3.1
Sweep the frequency back and forth once to explore whether there is resonance. The frequency sweep adopts logarithmic method. The frequency sweep rate is one octave per minute. Table 7
Acceleration
5.8.3.2 If there is no resonance, or if there is resonance and it has been eliminated, conduct vibration resistance tests at a frequency of 30Hz in two directions for 2 hours each. 5.8.4 Impact test:
The explosion-proof ventilator shall be impacted three times in the vertical and horizontal directions at an impact acceleration peak of 50m/s2 and a typical pulse duration of 11ms.
6 Inspection rules
6.1 Inspection classification
The inspection of explosion-proof ventilators is divided into factory inspection and type inspection. 6.2 Factory inspection
6.2.1 The mass-produced explosion-proof ventilators shall be subjected to factory inspection upon delivery. 6.2.2 Factory inspection and type inspection shall be carried out according to the items specified in Table 8. 622
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Certification for low running
Appearance inspection
Test items
Impeller dynamic balance correction
Impeller overspeed test
Operation test
Self-excited vibration measurement
Aerodynamic performance test
Noise test
Explosion-proof test
Tilt and swing test
Environmental vibration test
Impact test
6.3 Type inspection
GB 11800—89
Corresponding technical requirements
4.9, 4.10
4.6, 5.1
4.8, 5.4
4.5, 5.5
4.7, 5.6
4.4, 5.8.2
4.4, 5.8.3
4.4, 5.8.4
Factory inspection
100% inspection
5% inspection (to At least one unit is inspected)
When any of the following conditions exists, explosion-proof ventilators shall be subjected to type inspection: a.
The first product of each type of explosion-proof ventilator;
The first product of each type of explosion-proof ventilator produced in Guangdong, b.
When there are major modifications to the design, structure, materials and processes, which may affect the performance; When the factory inspection results are significantly different from the last type inspection; d.
When the national quality supervision and inspection agency proposes a requirement for type inspection. 6.4 Judgment rules
Type inspection
100% inspection (one unit for each model)
Inspection of the same series, one unit for each of the two
models
6.4.1 Each explosion-proof ventilator shall be inspected by the manufacturer's technical inspection department in accordance with the provisions of this standard. Those that meet the requirements are qualified products and can only leave the factory after a certificate of conformity is issued. 6.4.2 If the explosion-proof ventilators sampled are out of tolerance according to the regulations, they should be doubled for testing. If they meet the regulations, they are still qualified. If they are still out of tolerance, the batch of products is unqualified and should be repaired and inspected one by one before they can be shipped. 6.5 User requirements
When the user needs to participate in the test and inspection of the explosion-proof ventilator, it should be stipulated in the contract between the supply and demand parties. 7 Marking, packaging, transportation, storage
7.1 Marking
7.1.1 The explosion-proof ventilator should be equipped with a turning arrow, airflow direction arrow and product nameplate in a conspicuous position. The nameplate content includes: product name, model, number, manufacturer name, date and ship inspection mark and explosion-proof type mark, etc. 7.2 Packaging and transportation
7.2.1 The explosion-proof ventilator should be packed in a packaging box as a whole. For large-sized explosion-proof ventilators of type 1 (deck type) and type III (compartment type), it is allowed to be packed in two parts. Domestic packaging shall comply with the provisions of JB2759, and export packaging shall comply with the provisions of GBn193. 7.2.2 The explosion-proof ventilator should be leveled, clamped and bolted in the packaging box. Disassembly tools and other parts should also be fastened and fixed in the gaps in the box to prevent movement and displacement during transportation. 7.2.3 The documents accompanying the explosion-proof ventilator are:
Product certificate;
Explosion-proof certificate
Product manual or sample;
Packing list;
Complete supply list.
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GB 11800—89
7.2.4 The manufacturer should ensure that the product will not be corroded, reduced in quality or lost due to poor packaging for at least 6 months from the date of shipment. 7.2.5 The overall dimensions and weight of the packaging box should not exceed the regulations of the relevant transportation department. 7.2.6. The structure of the packaging box should be convenient for lifting, handling and long-distance transportation, as well as multiple loading and unloading, climatic conditions, etc., and suitable for water and land transportation.
7.2.7 The signs on the packaging box surface should comply with the provisions of GB191. 7.3 Storage
7.3.1 The packaging box should be stored in a place where it will not be exposed to rain, sun and water erosion. The packaging box should be placed flat and stable, and the distance from the ground should not be less than 200~300mm.
7.3.2 The packaging box should be unpacked and inspected regularly, and damaged and peeling paint and signs should be replaced when necessary. 8 Complete set supply
8.1 Complete set supply scope:
a. Type 1 (deck type) and Type IⅡI (pipe type), supply one explosion-proof ventilator assembled together (including one matching flameproof motor), and one set of impeller removal tools.
b. Type III (compartment type) supplies a set of explosion-proof ventilators, transmission devices, sealing stuffing boxes and flexible couplings, and a set of impeller disassembly tools. The matching motors are supplied according to user requirements. 8.2 According to the contract between the supply and demand parties, the manufacturer can supply spare parts. 9 Warranty period
If the explosion-proof ventilator is damaged or cannot work normally due to manufacturing quality problems within one year after delivery, but not more than eighteen months after delivery, the manufacturer shall repair or replace parts for the user free of charge. Additional notes:
This standard is proposed by China State Shipbuilding Corporation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Marine Machinery. This standard is drafted by the Shanghai Ship Equipment Research Institute of China State Shipbuilding Corporation. The main drafter of this standard is Wang Jinrong.
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