This standard specifies the technical requirements, inspection rules, marking, packaging and storage of coils. This standard is applicable to coils of air conditioning, ventilation, hot air heating and other systems with a maximum working pressure not exceeding 1.3MPa and whose media are cold, hot water and steam. JB/T 4292-1991 Coil technical conditions JB/T4292-1991 Standard download and decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
Coil
Technical Conditions
Subject Content and Scope of Application
This standard specifies the technical requirements, inspection rules, signs, Packaging and storage. JB/T4292-91
replaces JB4292-86
This standard is applicable to air conditioning, ventilation, hot air heating and other systems, the maximum working pressure does not exceed 1.3MPa, and the medium is cold, hot water and steam. Tube.
2 Reference standards
GB985 Basic types and dimensions of manual arc welding joints GB10223 Air cooler air heater performance test method Heating ventilation and air conditioning equipment coating technical conditions ZB J72 017||tt| |ZB J72 021
Coil pressure test and sealing inspection
General technical conditions for packaging of heating and cooling ventilation equipment ZBJ72026
ZBJ72029
Appearance quality and cleanliness of heating and ventilation equipment JB8 Product Label
3 Technical Requirements
3.1 General Requirements
3.1.1 The coil pipe shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 3.1.2 The surface of all ferrous metal parts should be treated with anti-corrosion treatment. 3.1.3 The fins of the heat exchange tube should be neat, straight, evenly spaced, and should be in close contact with the tube. The tolerance of the fin distance is as specified in Table 1. Table 1
type
wound
set
formula
sheet
sheet
Note: 1) In 100 pieces The tolerance of the sum of the distances between the distances is the length of the distance. Tolerance of sheet distance\
±4%
±2%
3.1.4 The coating of heat exchange tubes that have been thermally dip-plated or used other anti-corrosion and seal-gap treatments should be uniform and Smooth, the connection between the fins and the heat exchange light tube should be firm, and the rewinding and selection of the heat exchange tube should be trimmed after immersion plating. 3.1.5 The basic type and size of welded joints should comply with the regulations of GB985. 3.1.6 The weld should be free of cracks, pores and other defects, and should smoothly transition to the base metal. Welds with plate thickness not exceeding 3mm should have no undercut; welds with plate thickness exceeding 3mm should have undercut depth not exceeding 0.8mm. 3.1.7 The dimensional tolerance of the center distance of the flange connection holes should comply with the requirements in the figure below and Table 2. The Ministry of Mechanical and Electronics Industry of the People's Republic of China approved the implementation on 1992-07-01 on 1991-07-22
691
3.1.8
a.
3.1.9|| tt||3.1.10
3.1.11
3.1.12
3.1.13
3. 1. 14
A||tt| |Electricity
center distance
foot
inch
A2
The difference between the two diagonal dimensions of the flange inner frame:
JB /T 4292—91
Shen
A
Table 2
1000
>1 000
When the diagonal size does not exceed No more than 3mm when 1m; no more than 5mm when the diagonal size exceeds 1m. Charge difference
±3
±4
±?
mm
The coil should be subjected to a pressure test of 1.25 times the working pressure, and The sealing inspection method shall be in accordance with the provisions of ZBJ72021. The outer surface coating of coil pipe shall be painted according to the regulations of ZBJ72017. The appearance quality and cleanliness of the coil are in accordance with ZBJ72029. The pipe joints of coiled pipes should be protected when leaving the factory. Qualified parts, components, purchased parts, external parts, and standard parts should have product certificates before they can be assembled into coils and work in normal atmospheric environments. Their life indicators should not be lower than those specified in Table 3. Table 3
Indicator name
Life
Life
Heat
10
Water
Heat transfer medium||tt ||5
Auto
a
3.1.15 Under the condition that the user abides by the product instructions and other regulations, within 18 months from the date of shipment from the manufacturer: the product If it does not work properly due to poor manufacturing quality, the manufacturer should repair or replace it free of charge. 3.2 Main technical indicators
3.2.1 The main technical indicators of the coil are tested according to GB10223. Under the specified working conditions, the indicators of its heat transfer coefficient, air flow resistance and water passage resistance are specified in Table 4.
Table 4
item
item
heat transfer coefficient
air flow resistance
water passage resistance
2 test The working conditions are specified in Table 5.
3.2.2
692
refers to
standard
≥92% of the nominal value
≥110% of the nominal value|| tt||≥115% of the nominal value
Intake status
Water supply status
Steam pressure
Number
Condition parameter
Dry bulb temperature
Wet bulb temperature
Inlet water temperature
Water velocity
Windward flow velocity
4 Test methods and inspection rules
4.1 The performance test of the coil shall be carried out in accordance with GB10223. 4.2 Inspection rules
JB/T 4292—91
Table 5
Steam
C
C
m/s||tt ||MPa
m/s
20
o.1
4
Heating coil
Hot water||tt| |20
95
1
4
4.2.1 Each component and the entire product of the coil should be inspected and passed by the quality inspection department of the manufacturer. Factory. 4.2.2
Various inspections of coils shall be in accordance with the provisions of Table 6.
Table 6
item
item
pressure resistance and sealing test
heat transfer coefficient
air resistance
Water passage resistance
Appearance inspection
4.2.3
a.
b.
c.
Type test regulations are as follows;| | tt | | |tt | ; Cooling coil
cold water
27
19.5
7
1
2.5
factory||tt| |When the national supervision agency proposes type testing requirements: If the same product has multiple functions (heating or cooling) or uses different heating media, only one of them should be tested.
4.2.4
b.
c.
The random inspection regulations are as follows:
Coils produced in batches should be subject to routine sampling inspection. To check the stability of the production process; the number of products in one year is used as an inspection batch, and the sampling time should be evenly distributed throughout the year; the inspection plan is based on the one-time sampling plan specified in Table 7. Table 7
Batch
Quantity
50
>50~100Www.bzxZ.net
>100-500
>500
Sample size n
2
3
5
8
pass judgment number A.
0
2
The number of unqualified judgments R.
1
2
3
693
Logo, packaging and storage
5
5.1 Logo||tt ||JB/T 4292--91
5.1.1 Each coil should have a product nameplate fixed at an obvious location. The type, size and technical requirements of the nameplate should comply with the regulations of JB8. The nameplate should have the following: Content:
Manufacturer name;
a.
Product model and name;
b.
c.
Maximum working pressure ;
d.
Product number;
e.
Manufactured and on schedule.
5.1.2
The coil should be marked with a trademark.
5.2 packaging
5.2.1
Coil packaging should be in accordance with ZBJ72026. 5.2.2
a,
b.
c.
The following technical documents should be included in the packaging box:
Product Certificate; ||tt ||Product manual:
Packing list.
5.2.3
The packing mark should be painted with non-fading ink on each packaging box, and the content is: a.
b.
c.| |tt|| Product model and name;
Product net weight, gross weight;
Overall dimensions of the packaging box (length × width × height); d. Total box, first box.
5.3 Storage
Coiled pipes should be stored in a ventilated and dry warehouse to prevent product damage from collision and corrosion by corrosive gases. Additional notes:
This standard is proposed and administered by the Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronics Industry. This standard is drafted by Tianjin Heater Factory. The main drafter of this standard: Li Shanling.
694
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