CB/T 4560-2025 in English

VALID

J Class Ship Air Pipe Fitting

Issued on:2025-04-10
Implemented on:2025-11-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $210.00
$204.00

Standard No:	CB/T 4560-2025
Document status:	VALID
Title in English:	J Class Ship Air Pipe Fitting
Title in Chinese:	J类船用空气管头
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2025-04-10
Implemented on:	2025-11-01
ICS Classification:	47.020.30-Piping systems
Chinese Classification:	U55-Marine pipe fittings
Professional Classification:	CB-Watercraft
Related Keywords:	jdy type float type j class ship air pipe fitting introduction standard evolution cap type buoy type jb/jd type

Introduction

Standard Evolution and Background Analysis

This standard integrates three independent standards from the 1980s (CBM 1067-1981, CBM 1105-1982, CBM 1106-1982). The main technical upgrades include:

Improvement dimensions	Old standard	New standard
Product type	Separate oil tank/water tank	Merge A/B type
Specification range	DN≤250mm	Extended to DN450mm
Test method	Single seal test	Add impact test

Core parameter analysis

Product classification system

Comparison of characteristics of four types:

JA type (cap type): basic protection type, suitable for oil/water/empty tanks
JB type (gooseneck type): with float structure, surge protection design
JC type (for depth sounding): multi-functional integrated design
JD type (buoy type): dedicated for large-size oil tanks (DN450)

Key technical requirements

Sealing performance indicators

The new standard proposes dual test requirements for JB/JD type:

Test conditions	Immersion speed	Holding time	Allow leakage
Conventional test	4m/min	Instant	≤DN×2mL
Intensified test	8m/min	5 minutes	≤DN×2mL

Note:It needs to be tested in the upright position and 40° tilted state

Material and manufacturing specifications

Material selection for key components

Main body material: cast steel (ZG200-400C)/ductile iron (QT400-15)
Float assembly: 06Cr19Ni10 stainless steel (GB/T 3280)
Seal material: Nitrile rubber F6364 (oil resistant)

For castings, 3 test bars with furnace numbers are required for each furnace, and the shelf life is ≥3 years

Implementation recommendations

Selection and application guide

For oil tanks, JDY type float type is preferred, and DN≥150mm must be used
Cast steel body is selected for corrosive environment, and ductile iron can be used in cost-sensitive scenarios
Pay attention to the matching of flange surface and JIS B2220/B2239 during installation

Special Tips: After the implementation of the new standard, the original CBM standard related design documents need to be updated synchronously

More samples: NB/T 47013.2-2015 GB 50021-2001(2009) YD/T 3934-2021

Sample only — not a preview of CB/T 4560-2025