This standard specifies the product classification, technical requirements and marking of ship bottom drain plugs. This standard applies to steel ship bottom oil, water tank, drain plugs for oil and water. This standard does not apply to small boats with a bottom plate thickness of less than 6mm. CB/T 254-1997 Ship bottom drain plug CB/T254-1997 Standard download decompression password: www.bzxz.net

ICS.47.U2U.1U
Ship Industry Standard of the People's Republic of China
CB/T254--1997
Ship's bottom plugs and spanners1997-10-17 Issued
China State Shipbuilding Corporation Issued
1998-06-01 Implementation
CB/T254-1997
This standard is a revision of CB254-82. The revision refers to the structural types of the two types of spanners, D” and E”, in Japanese JIS F3005-1982 "Ship's bottom spanners". According to the actual situation in my country, the A30 specification in CB\254--82 "Ship's bottom spanners" is retained, and shoulderless spanners are added to this specification. Both forms are applicable to oil-water tanks, expanding the universality and series of standards. It is convenient for screw plug processing and hull installation.
This standard will replace CB*254-82 from the date of entry into force. This standard is proposed by the National Technical Committee for Standardization of Ship Equipment. This standard is under the jurisdiction of Jiangnan Shipbuilding Group Co., Ltd. This standard was drafted by: Hudong Shipyard, Jiangnan Shipyard Group Co., Ltd. The main drafters of this standard are: Hao Yuejuan, Chen Baopei, Gu Jinyuan, Shao Jinhua, Tong Zirong. 1 Scope
Ship Industry Standard of the People's Republic of China
Ship's bottom plugs and spanners
Ship's bottom plugs and spanners This standard specifies the product classification, technical requirements and markings of ship's bottom drain plugs. This standard applies to steel ship's bottom oil, water tank, drain oil, water plugs. This standard does not apply to small boats with a bottom plate thickness of less than 6mm. 2 Product classification
The types of ship's bottom drain plugs are shown in Table 1.
Table 1 Types of ship's bottom drain plugs bzxz.net
Types and codes
Shoulderless bottom
Drain plugs ||tt ||Shouldered bottom
Drain plug
China State Shipbuilding Corporation approved on October 17, 1997 Hexagonal (O)
Square (W)
Angle (0)
Square (W)
Material code
Stainless steel acid pot
CB/T254-1997
Classification number: U26|| tt||Replaces CB254-82
Applicable scope
Bottom oil tank
Bottom water tank
Bottom oil tank
Bottom water tank
1998-06-01Implementation
CB/T254-1997
2.2 Structural type and basic dimensions of bottom drain screw plug. 2.2.1 Structural type and basic dimensions of type A screw plug The configuration and basic dimensions are as shown in Figure 1 and Table 2. D
1—cock; 2—seat plate; 3—gasket
Figure 1A type screw plug
Marking place
Bottom plate
Bottom plate
CB/T254--1997
2.2.2The configuration and basic dimensions of B type screw plug are as shown in Figure 2 and Table 2.30
1-cock; 2--seat plate; 3-gasket
Figure 2B-type screw plug
Marking place
Bottom plate
Bottom plate
CB/T254-—1997
2.2.3 The structural type and main dimensions of the cock are shown in Figure 3 and Table 2. Figure 3
2541997
8xImportant matters
2 .3 The wrench structure and size are in accordance with Figure 4 and Table 3. Nominal size
2.4 Marking example
CB/T254—1997
Figure 4 Wrench
Table 3 Wrench size
The plug is hexagonal, with a nominal size of 42mm, and a seat plate h=35mm. The oil tank uses a stainless steel shoulderless bottom drain plug: drain plug AO42-35NCB/T254—1997The plug is square, with a nominal size of 52mm, and a seat plate h=45mm. The water tank uses a brass shouldered bottom drain plug: drain plug BW52-45HCB/T254-1997mm
Weight, kg
3 Technical requirements
CB/T2541997
The main parts and materials of the bottom drain plug are in accordance with Table 4. Table 4 Parts Materials
High-quality carbon structural steel
Stainless acid-resistant steel
Ordinary carbon structural steel
Chloroprene rubber
1Cr18Ni9Ti
HPb59-1
Q235-A
The wrench should be galvanized, one for every 10 drain plugs, or as required by the ordering party. 3.2
3.3After the manufacture of the bottom drain plug, it should be inspected and accepted by the manufacturer's technical inspection department and a certificate of conformity should be issued. 3.4After the installation of the bottom drain plug, it should be tested for tightness together with the hull oil and water tank. 4 Marking
Each bottom drain plug should have the following markings: a) plug mark;
b) inspection seal.
Standard No.
GB699—88
GB1220—84
GB4425—84
GB700—88
GB469—83
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