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GB/T 39655.2-2020: Shipbuilding - Ship screw propellers - Manufacturing tolerances - Part 2: Propellers of diameter between 0.8 m and 2.5 m inclusive
Status: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 39655.2-2020 | English | 244 |
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Shipbuilding - Ship screw propellers - Manufacturing tolerances - Part 2: Propellers of diameter between 0.8 m and 2.5 m inclusive
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GB/T 39655.2-2020
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Basic data | Standard ID | GB/T 39655.2-2020 (GB/T39655.2-2020) | | Description (Translated English) | Shipbuilding - Ship screw propellers - Manufacturing tolerances - Part 2: Propellers of diameter between 0.8 m and 2.5 m inclusive | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | U04 | | Classification of International Standard | 47.020.01 | | Word Count Estimation | 13,114 | | Date of Issue | 2020-12-14 | | Date of Implementation | 2021-07-01 | | Adopted Standard | ISO 484-1-2015, IDT | | Regulation (derived from) | National Standard Announcement No. 28 of 2020 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | | Summary | This standard specifies the manufacturing tolerances of marine propellers with a diameter of 0.8 m to 2.5 m. | GB/T 39655.2-2020: Shipbuilding - Ship screw propellers - Manufacturing tolerances - Part 2: Propellers of diameter between 0.8 m and 2.5 m inclusive
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Shipbuilding, marine propellers, manufacturing tolerances, part 2: propellers with a diameter of 0:8m to 2:5m)
ICS 47:020:01
U04
National Standards of People's Republic of China
Manufacturing tolerances of ship propellers
Part 2: Propellers with a diameter of 0:8m to 2:5m
(ISO 484-2:2015, IDT)
2020-12-14 release
2021-07-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Foreword
GB/T 39655 "Tolerances for manufacturing ship propellers for shipbuilding" is divided into two parts:
---Part 1: Propellers with a diameter greater than 2:5m;
---Part 2: Propellers with a diameter of 0:8m to 2:5m:
This part is Part 2 of GB/T 39655:
This section was drafted in accordance with the rules given in GB/T 1:1-2009:
The translation method used in this part is equivalent to ISO 484-2:2015 ``Shipbuilding Marine Propeller Manufacturing Tolerance Part 2: Diameter
Propellers from 0:8m to 2:5m":
The Chinese documents that have a consistent correspondence with the international documents cited in this section are as follows:
---GB/T 131-2006 Product Geometric Technical Specification (GPS) Representation of surface structure in technical product documents (ISO 1302:
2002, IDT):
This part was proposed and managed by the National Ocean Shipping Standardization Technical Committee (SAC/TC12):
Drafting organizations of this section: China State Shipbuilding Industry Research Institute, China Merchants Cruise Research Institute (Shanghai) Co:, Ltd:, Shanghai Overseas
Takahashi Shipbuilding Co:, Ltd:
The main drafters of this section: Zhu Jiashuai, Cheng Nan, Yao Rulin, Tian Zhengjun, Wang Gaoshuai, Bao Guangzheng:
Manufacturing tolerances of ship propellers
Part 2: Propellers with a diameter of 0:8m to 2:5m
1 Scope
This part of GB/T 39655 specifies the manufacturing tolerances for marine propellers with diameters ranging from 0:8m to 2:5m:
Note: In some cases, it is allowed to make some adjustments to the deviation based on the judgment of the customer or the designer and the customer:
2 Normative references
The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article
Pieces: For undated references, the latest version (including all amendments) applies to this document:
GB/T 9239:1-2006 Mechanical vibration constant (rigid) rotor balance quality requirements Part 1: Specification and balance tolerance
Inspection (ISO 1940-1:2003, IDT)
ISO 1302 Geometrical Product Specification (GPS) The representation of surface structure in technical product documents (GeometricalProduct
Specifications(GPS)-Indicationofsurfacetextureintechnicalproductdocumentation)
3 Scope of application
This section applies to integral, combined fixed pitch propellers and controllable pitch propellers:
4 Pitch measurement method
4:1 The principle of the measurement method is to measure the length PQ corresponding to the predetermined angle α along the helix of the radius r, and measure the points P and Q
The height difference h relative to the reference surface (see Figure 1):
The length of PQ can be measured by one of the methods described in 4:1:1, 4:1:2 or 4:1:3:
Note: If necessary, other methods that meet the accuracy requirements can be used:
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