JB/T 1212-1999 JB/T 1212-1999 Round Bubble Cap JB/T1212-1999 Standard download decompression password: www.bzxz.net

ICS75.180
Machinery Industry Standard of the People's Republic of China
JB/T1212—1999
Round bubble cap
Round bubble cap
Published on July 12, 1999
National Bureau of Machinery Industry
Implemented on January 1, 2000
JB/T1212-1999
This standard is a revision of B1212-73 "Round bubble cap". Compared with JB1212-73, this standard mainly modifies some steel grades. This standard replaces JB1212-73 from the date of implementation. This standard is proposed and managed by Lanzhou Petroleum Machinery Research Institute. The responsible drafting unit of this standard: Lanzhou Petroleum Machinery Research Institute. Drafters of this standard: Dong Yiliang, Li Xianbiao. This standard was first issued in 1965; this revision is the second revision. This standard is interpreted by Lanzhou Petroleum Machinery Research Institute. Scope
Machinery Industry Standard of the People's Republic of China
Round bubble cap
Round bubble cap
This standard specifies the type, size, material and technical requirements of round bubble caps. This standard applies to round bubble caps for towers used in the chemical and petroleum industries. 2 Referenced standards
JB/T1212—1999
Replaces JB1212—73
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 41—1986
GB/T 95—1985
GB/T 700—1988
GB/T 912—1989
GB/T1220—1992
GB/T4237—1992
GB 9948—1988
3 Types, dimensions and materials
Type 1 hexagonal nut Grade C
Flat washer Grade C
Carbon structural steel
Hot-rolled thin steel plates and strips of carbon structural steel and low-alloy structural steelStainless steel bars
Hot-rolled stainless steel plates
Seamless steel pipes for petroleum cracking
The types, dimensions and materials of round bulb caps shall be as specified in Figure 1 (DN80, DN100), Figure 2 (DN150) and Tables 1 and 2. Special-shaped nut Connecting stud Connecting stud Rising pipe D, × S, Approved by the State Bureau of Machinery Industry on 1999-07-12 209 Implemented on 2000-01-01 Rising pipe Connecting stud Connecting stud Special-shaped nut Connecting stud Connecting stud Rising pipe ||1212—1999
0235-A·F
Q235-A or 10
Q235-A
Q235-A
Q235-A·Fbzxz.net
Q235-A
0235-A·F
Q235-A·F
1When other materials are used, it should be indicated in the drawing. 2 Washers according to GB/T95, nuts according to GB/T41
GB/T912
GB/T 700
GB/T 700
GB/T700
GB/T 912
GB/T 700
GB/T 912
GB/T 912 | /T4237
GB9948
GB/T1230
GB/T1220
GB/T4237
GB/T1220
GB/T4237
GB/T 4237
Material type
Nominal diameter DN
Bubble cap outer diameter Di×wall thickness Si
Bubble cap top outer diameter D3
Riser pipe outer diameter DX wall thickness S
Total height H
Riser pipe height H
Bubble cap height
Bubble cap top to tooth gap height
Bracket to bubble cap bottom height H
Gap height
Gap width
Gap number n
Gap pitch
Ascendant aperture α
Ascendant net area F
Revolving area F
Annular area F
Gap total area F
Weight of bubble cap
Note: Gap width b, 135mm indicates arc length. 4 Technical requirements
1212—1999
100×3
158×3
108×4
108×4
4.1 The size tolerance of bubble cap shall be in accordance with the provisions of Figure 3 and Figure 4. For the bubble cap of Figure 3, the tolerance of the last punched gap pitch f is ±1mm. 3
JB/T1212-1999
For the bubble cap of Figure 4, the pitch tolerance of the last punched tooth gap is ±15mm. f±0.5
After the tooth gap of the bubble cap of Figure 3 is punched, if there is a crack in the lower part of the tooth gap, it must be repaired and smoothed. 4.3 There are no defects such as cracks and grooves on the surface of the expanded part of the riser. 4.4 After the bubble cap is installed, the distance e between the outer diameter of the bubble cap and the outer diameter of the riser should be equal, and the difference between the maximum and minimum dimensions shall not exceed 3mm. 5 Marking example
DN80, h=25mm, material class I round bulb cap is marked as: Round bulb cap DN80-25-IJB/T1212—1999 China
Mechanical Industry Standard
Round bulb cap
JB/T1212—1999
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing: Postal Code 100044 ）*
1/16 Printing sheet 1/
: Word count 10,000
Format 880×1230
First edition in November 1999
First printing in November 1999
Print run 1-500
Price 5.00 yuan
No. 99-1014
Mechanical Industry Standard Service Network: http:/wwwJB.accn666
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