JB/T 1212-1999 JB/T 1212-1999 Round Bubble Cap JB/T1212-1999 Standard download decompression password: www.bzxz.net
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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—1988www.bzxz.net 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·F 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 Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.