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National Standard of the People's Republic of China
Marine explosion-proof type centrifugal fans
Marine explosion-proof type centrifugal fans1 Subject content and scope of application
GB 11799--89bzxz.net
This standard specifies the product classification, technical requirements, test methods and inspection rules of marine explosion-proof centrifugal 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 places such as oil tanks, cargo holds, pump rooms, battery compartments, ammunition compartments, hangars, paint rooms, etc. 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 electrical instruments for export GB 191
Packaging, storage and transportation pictorial symbols
Basic types and dimensions of manual arc welding joints GB1236 Test methods for aerodynamic performance of ventilators Tolerances and fits Limit deviations of dimensions without tolerances GB1804
GB 2888
Methods for measuring noise of fans and Roots blowers GB 3836.1
General requirements for explosion-proof electrical equipment for explosive atmospheres Explosion-proof electrical equipment for explosive atmospheres Flameproof electrical equipment "dGB 3836. 2
GB5117 Carbon steel welding rod
JB2759 General technical conditions for packaging of electromechanical products 3 Product classification
3.1 Basic type
3.1.1 Explosion-proof ventilator is horizontal, single-stage, single-suction structure. If necessary, it can also be a vertical structure. 3.1.2 The explosion-proof type and grade of explosion-proof ventilator are: dIBT4. That is, flameproof type, Class I electrical equipment, suitable for Class B explosive gas mixture maximum safe gap or minimum ignition current ratio, maximum surface temperature is T4 group. 3.1.3 Explosion-proof ventilator is made of Type I (direct connection type) There are two basic structural types: type I (compartment type) and type I (compartment type) (see Figure 1). The State Bureau of Technical Supervision approved the reduction of the network on November 21, 1989. The standard industry data was free of charge. It was implemented on July 1, 1990. Type I (direct-connected) GB1179989 1—YB-H type motor; 2-explosion-proof fan; 3-transmission device, 4-sealed stuffing box 5-flexible coupling Type II (compartment type) 3.1.4 [Type (direct-connected is Explosion-proof motor direct drive structure. The impeller is directly mounted on the motor shaft, and the casing is fixed on the explosion-proof motor flange.
3.1.5 Type II (compartment type) is a structure in which the explosion-proof fan and the motor are separated by a compartment, and is composed of an intermediate transmission device, a sealed stuffing box, and a flexible coupling.
3.1.6 The explosion-proof ventilator is made into an airtight structure. 3.1.7 The explosion-proof ventilator should be made so that the impeller can be disassembled and assembled from the air inlet side. 3.1.8 The air inlet of the explosion-proof ventilator is made into a circular structure, and the air outlet is a rectangular structure. 3.1.9 The explosion-proof ventilator can be made to rotate clockwise (right) or counterclockwise. Rotation (left turn). Reverse rotation (left turn) - When viewed from the end of the explosion-proof motor, the impeller rotates in the counterclockwise direction, indicated by "L". Clockwise rotation (right turn) - When viewed from the end of the explosion-proof motor, the impeller rotates in the clockwise direction, indicated by "R". 3.1.10 The air outlet position of the explosion-proof fan is made into the following basic forms according to the direction of the impeller (see Figure 2). As required, the air outlet is allowed to adopt other forms that vary by 30°.
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Lifting wheel rotation room
GB11799-89
1, 135
Figure 2 Viewed from the end of the explosion-proof motor
Impeller rotation room
3.1.11 The explosion-proof fan can be equipped with 50Hz or 60Hz, YB-H series flameproof marine three-phase asynchronous motor. 3.2 Basic parameters
3.2.1 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 "△". 3.2.2 The basic parameters when equipped with 50Hz explosion-proof motors are shown in Table 1. Table 1
Pressure, Pa (mmH2o)
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/m. 3.2.3 The basic parameters when equipped with 60Hz explosion-proof motors are shown in Table 2.609
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GB 11799
Pressure, Pa(mmH20)
（100）（120）
Note: The standard air intake conditions of the parameters in the table are, that is, the atmospheric pressure is 101.33kPa, the temperature is +20℃, the relative humidity is 50%, and the density is 1.2kg/m3. 3.3 Product marking
The marking of explosion-proof ventilators consists of product name, technical characteristics and standard number, and its format is as follows: 3.3.1
Motor frequency is omitted for 50Hz, and (60) for 60Hz Represents
Static pressure, Pa
-flow rate, 10-2m/h
Structural type: I—direct-connected type
I——compartment type
3.3.2 Marking example
Flow rate 7200m*/h, static pressure 980.7Pa (100mmH20) equipped with 50Hz direct-connected marine explosion-proof centrifugal fan, marked as: explosion-proof fan I72-980.7GB11799-894 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 a ship inspection agency.
4.3 The trouble-free operation time of the explosion-proof fan should not be less than 8000h. 610
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GB 1179989
4.4 Explosion-proof ventilators should be able to work safely and reliably under the following conditions: in cabins and places with explosive mixtures of Class IB and Group T4 specified in GB3836.1 and GB3836.2; 8.
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 have a diameter of no more than 2mm; can transport marine air containing salt mist and corrosive air containing oil mist: temperature: -25～→50℃;
relative humidity is not more than 95%;
pitch and pitch are 10° forward and backward respectively;
roll is 15° left and right respectively and roll is ±22.5° (45° in special occasions); vibration;
impact.
4.5 The pressure value of explosion-proof fans at rated flow should not exceed ±10% of the specified value. 4.6 The impeller should be calibrated for static and dynamic balance. The dynamic balance accuracy should not be lower than G6.3 level. 4.7 The specific sound pressure level of explosion-proof fans at specified flow should not be higher than 27dB(A). 4.8 The vibration speed of explosion-proof fans should not exceed 6mm/s. 4.9 The steel parts of explosion-proof fans should be galvanized. When the size is larger, 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 bottom 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 to be selected.
Parts name
Impeller front disc
Impeller rear disc
Air inlet or air duct
Austenitic stainless steel
1 Cr18Ni9Ti
Q235-A
Standard number
GB1220
GB2060
4.12The tolerance of the overall dimensions of explosion-proof fans shall not be less than that specified in Js17 of GB1804, and the position deviation of the inlet and outlet flanges shall not be greater than 1.2% of the position dimension.
4.13The hole spacing tolerance of the holes drilled on the inlet and outlet flanges of explosion-proof fans shall not be greater than ±0.5mm. 4.14The surface shape and position tolerance of the impeller shall not exceed the provisions of Table 4. Table 4
Impeller diameter
Radial runout at the outer diameter of the front and rear discs
Axial runout at the outer diameter of the front and rear discs
Marking degree Thin net AW.bo
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300～500
>500～1000
Impeller diameter
Impeller blade outlet width tolerance
Vertical degree between blade and front and rear disk
(Relative blade width)
Flatness tolerance of rear disk
GB 11799—89
Continued Table 4
300～500
Less than 4/1000 of length dimension
4.15The deviation of blade outlet installation angle shall not be greater than ±1°4.16The tolerance of chord length at the outlet end of any three adjacent blades of the impeller shall not exceed ±5% of the chord length. >500～1 000
4.17The casing and air inlet shall be flat, and defects such as crushing, unevenness and skewness are not allowed. The geometric tolerances of the side panels of the housing shall not exceed the provisions of Table 5.
Overall dimensions
Flatness of side panels
Coaxiality of circular holes on both side panels
400~800
4.18The basic types and dimensions of welded joints shall comply with the requirements of GB985. 4.19Welding rods that comply with the provisions of GB5117 shall be used for welded parts. >800～1200
>1 200~2 000
4.20The surface of welded parts shall be flat. After welding, the weld shall be cleaned and the deformation shall be corrected. No defects such as leaking welds, burn-through, cracks, and incomplete penetration are allowed. The diameter of a single pore in the weld shall be less than 1mm. The number of pores in a 100mm long weld shall be less than 5, and the spacing shall be greater than 5mm. 4.21 The gap of riveted parts shall not be greater than 0.1mm within the range of twice the rivet diameter, and shall not be greater than 0.2-0.3mm in other parts. 4.22 The rivet head shall 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 During the production process, the impeller shall be dynamically balanced on a dynamic balancing machine. 5.1.2 The balancing weight shall be flat, with chamfers all around, and firmly fixed on the outer side of the front and rear discs of the impeller. No more than two balancing weights shall be on the same correction surface.
5.2 Impeller overspeed test
The impeller shall be operated for 10 minutes at a speed exceeding the rated speed by 20%. After operation, check the rivets, front disc, rear disc and blades. There shall be no defects such as loose rivets, cracks and damage. The dimensional deformation is calculated according to the following formula, and its value should not be greater than 0.5/1000. Dimension deformation =
5.3 Operation test
Dimension before test - dimension after test
Dimension before test
After the explosion-proof fan is powered on, it should run for 20 minutes. There should be no abnormal phenomena such as friction, 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 (root mean square value) in the three directions of up and down, left and right, and front and back near the motor bearing is measured.
5.5 Aerodynamic performance test
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Perform according to the provisions of GB1236.
5.6 Noise test
Perform according to the provisions of GB2888.
5.7 Explosion-proof test
GB 11799---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 be subjected to product explosion-proof test 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 without any abnormal phenomena such as scratching, abnormal noise and severe vibration. 5.8.2 Tilt and swing test:
Taking the explosion-proof fan rotating axis as the standard, starting from the plumb line, the explosion-proof fan should be tested in the following order: 5.8.2.1
Pitch 10° front and back, test time not less than 15min; roll 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:
5.8.3.1 The explosion-proof fan should be checked for vibration response according to the parameters in Table 6. That is, in the entire frequency range, sweep the frequency from low to high and then from high to low back and forth once to explore whether there is resonance. The sweep frequency adopts logarithmic method, and the sweep frequency rate is one octave per minute. Table 6
Acceleration
5.8.3.2 If there is no resonance, or if there is resonance and it has been eliminated, conduct vibration resistance test at 30Hz frequency in two directions for 2h each. 5.8.4 Impact test:
The explosion-proof ventilator shall be impacted three times in vertical and horizontal directions at the impact acceleration peak value of 50m/s2 and the 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 Explosion-proof ventilators produced in batches shall be subject to factory inspection upon delivery. 6.2.2 Factory inspection and type inspection shall be carried out according to the items specified in Table 7. 613
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Allowing to proceed
Test items
Appearance inspection
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 11799--89
Relevant technical requirements
4.9, 4. 10 | |tt | 4
When any of the following conditions exists, explosion-proof ventilators should be subject 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 a transferred factory; Delivery inspection
100% inspection
5% inspection (at least
one unit)
When there are major changes in the design, structure, materials and process that may affect product performance; When there is a significant difference between the delivery inspection result and the last type inspection; 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
)
Inspect the same series, one unit each for two
models
6.4.1 Each explosion-proof ventilator must be inspected by the manufacturer's technical inspection department in accordance with the provisions of this standard. Products that meet the requirements are qualified products and can only be shipped after a certificate of conformity is issued. 6.4.2 If the explosion-proof ventilators sampled are out of tolerance, they should be doubled for testing. If they meet the requirements, 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 users need to participate in the testing and inspection of explosion-proof ventilators, this 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 and a 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 as a whole in a packing box. 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 fixed in the packing box with bolts. 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 include:
Product certificate;
Explosion-proof certificate;
Product manual or sample;
Packing list;
Marking information of various foreign marking industries
e. Complete set supply list.
GB11799—89
7.2.4 The manufacturer shall ensure that the product will not be corroded, degraded or lost due to poor packaging for at least 6 months from the date of shipment. 7.2.5 The dimensions and weight of the packaging box shall not exceed the regulations of the relevant transportation department. 7.2.6 The structure of the packaging box shall take into account the convenience of lifting, handling and long-distance transportation, as well as multiple loading and unloading, climatic conditions, etc., and shall be suitable for water and land transportation.
7.2.7 The signs on the surface of the packaging box shall comply with the provisions of GB191. 7.3 Storage
7.3.1 The packaging box shall 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, with a distance of not less than 200~300 mm from the ground.
7.3.2 The packaging box should be opened and inspected regularly, and damaged and peeling paint and signs should be replaced if necessary. 8 Complete set supply
8.1 Scope of complete set supply:
a. Type 11 (direct-connected) supplies one explosion-proof ventilator (including one flameproof motor) assembled together, and one set of impeller disassembly tools; Type 12 (compartmental) supplies one set of explosion-proof ventilator, transmission device, sealing stuffing box and flexible coupling. The matching motor is supplied according to the user's requirements. 8.2 The manufacturer can supply spare parts according to the contract between the supplier and the buyer. 9 Warranty period Within one year after delivery of the ship, but not more than eighteen months after delivery, if the explosion-proof ventilator is damaged or cannot work normally due to manufacturing quality problems, the manufacturer shall repair or replace parts for the user free of charge. Additional remarks: 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 Shanghai Ship Equipment Research Institute of China State Shipbuilding Corporation. The main drafter of this standard is Wang Jinrong.
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