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GB/T 4791-2025: Graphical symbols for pipeline accessory of ships
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 4791-2025	English	439	Add to Cart	4 days [Need to translate]	Graphical symbols for pipeline accessory of ships
GB/T 4791-2005	English	449	Add to Cart	3 days [Need to translate]	Graphical symbols for pipeline accessory of ships
GB/T 4791-1984	English	679	Add to Cart	5 days [Need to translate]	Graphical symbols of pipeline accessory systems in ships

GB/T 4791-2025: Graphical symbols for pipeline accessory of ships

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ICS 47.020.30 CCSU04 National Standards of the People's Republic of China Replaces GB/T 4791-2005 Ship piping accessories graphic symbols Published on 2025-10-31 Implemented on May 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document supersedes GB/T 4791-2005 "Graphical Symbols for Ship Piping Fittings". Compared with GB/T 4791-2005, this document differs in that it includes the following. Aside from structural adjustments and editorial changes, the main technical changes are as follows. a) Three new symbols have been added. double-walled tube, heating coil, and accompanying tube (see Table 1, sections 4.1.7, 4.1.8, and 4.1.9). b) The orifice plate pattern has been modified (see 4.2.24 in Table 2,.2005 version); c) A double blind flange drawing has been added (see 4.2.26 in Table 2); d) The following have been removed. threaded pipe caps (pipe plugs), through-hole fittings (watertight), through-hole fittings (non-watertight), single-sided pipe seat plates, and double-sided pipe seat plates (see...). (Table 2, 2.2.25, 2.2.28~2.2.31 in the.2005 edition) e) The graphic symbols for ball valves and straight-through hose connector valves have been changed (see Table 4, 4.4.12 and 4.4.35; Table 4, 2.4.12 in the.2005 edition). 4.4.33); f) The graphic symbols for the straight-through and right-angle cocks have been changed (see Table 4, 4.4.39 and 4.4.40; Table 4, 2.4.36 in the.2005 edition). and 2.4.37); g) The three-way L-type cock was changed to an L-type three-way cock, and the three-way T-type cock was changed to a T-type three-way cock, and the graphic symbols were modified. (See 4.4.41 and 4.4.42 in Table 4, and 2.4.38 and 2.4.39 in the.2005 edition of Table 4); h) Added L-type three-way ball valve, T-type three-way ball valve, right-angle hose connector valve, butterfly check valve, electro-hydraulic remote control shut-off valve, hydraulic... Remote-controlled butterfly valve (opening indication), hydraulic remote-controlled butterfly valve (on/off), flanged butterfly valve, plate check valve, float valve, electro-hydraulic remote-controlled butterfly valve. Butterfly valve (switch), electro-hydraulic remote control butterfly valve (opening indication), pneumatic remote control butterfly valve (opening indication), pneumatic remote control butterfly valve (switch) 20 symbols for pneumatic remote control shut-off valve, electric temperature control valve, pneumatic temperature control valve, needle valve, pressure regulating valve, and vacuum breaker valve (see Table 4) (4.4.13, 4.4.14, 4.4.36, 4.4.55~4.4.71) i) Four new symbols have been added. gas detector, Y-type filter, inhalation filter, and magnetic filter (see Table 5, sections 4.5.11 to 4.5.14); j) The graphic symbols for concentration meters and gas analyzers have been changed (see Table 6, 4.6.22 and 4.6.23; see Table 6, 2.6.22 in the.2005 edition). 2.6.23); k) Additional diagrams for pressure switches, pressure sensors, temperature switches, temperature sensors, level gauges, level switches, and level sensors have been added. Shape symbols (see Table 6, 4.6.6~4.6.9, 4.6.11~4.6.13; see Table 6, 2.6.6~2.6.9, 2.6.11~) in the.2005 edition. 2.6.13); l) Two new symbols have been added. differential pressure switch and differential pressure sensor (see Table 6, sections 4.6.25 and 4.6.26). m) Modified the cap-shaped air nozzle of the water (air) tank, the self-closing depth sounder, the open deck leak (circular or elliptical), and the water-sealed deck leak. Graphical symbols for leaks in decks, water-sealed closures, and water seal pipes (see Table 7, sections 4.7.1, 4.7.7, 4.7.8, 4.7.10, and 4.7.11). 4.7.13 (see Table 7 in the.2005 edition, 2.7.1, 2.7.7, 2.7.8, 2.7.10, 2.7.11, and 2.7.13). n) Added a top view of the flared pipe inlet (suction inlet), cold storage drain outlet, wall-mounted deck drain outlet, water-sealed deck drain outlet, and wash window. The seven symbols for nozzles, drinking water tank injection heads (with locks), and international shore access connectors are listed in Table 7 (see 4.7.14, 4.7.15~4.7.20). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed and is under the jurisdiction of the National Technical Committee on Standardization of Marine Ships (SAC/TC12). This document was drafted by the 708 Research Institute of China State Shipbuilding Corporation. The main drafters of this document are. Qin Jun, Yang Fan, Dong Yue, Lin Zhen, Bian Xuanyi, and Cheng Bin. This document was first published in 1984, revised for the second time in.2005, and this is the third revision. Ship piping accessories graphic symbols

1 Scope

This document specifies the graphic symbols for ship piping accessories. This document applies to the identification of graphic symbols for piping fittings in the design, construction, inspection, and repair of ships.

2 Normative references

This document has no normative references.

3 Terms and Definitions

This document does not contain any terms or definitions that need to be defined. 4.Graphic Symbols 4.1 Basic symbols are as per Table 1. Table 1 Basic Symbols Serial Number Name Symbol 4.1.1 Piping pipe 4.1.2 Piping with flow direction indicator 4.1.3 valves valve 4.1.4 appliance appliance 4.1.5 Indicating and measuring instruments indication, measuring instrument Telemetry indicators and measuring instruments remoteindication,measuringinstrument Double-walled pipe doublewalpipe 4.1.8 heating coil heatingcoil 4.1.9 Accompanying personnel tracingpipe ...