JB/T 13977-2020 English PDF (JBT13977-2020)

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JB/T 13977-2020: Liquefied natural gas cryogenic submersible pumps
JB/T 13977-2020
JB
MACHINERY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 23.080
J 71
Liquefied Natural Gas Cryogenic Submersible Pumps
液化天然气(LNG)低温潜液泵
ISSUED ON: AUGUST 31, 2020
IMPLEMENTED ON: APRIL 01, 2021
Issued by: Ministry of Industry and Information Technology of the People’s
Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Type and Model ... 6
4.1 Type ... 6
4.2 Model ... 6
5 Technical Requirements ... 6
5.1 General ... 6
5.2 Pressure shell ... 8
5.3 Nozzle and pressure shell interface ... 8
5.4 Rotor ... 9
5.5 Wear rings and running clearances ... 9
5.6 Motor ... 11
5.7 Rotor balancing ... 12
5.8 Bearings ... 12
5.9 Lubrication ... 13
5.10 Materials ... 13
5.11 Marking ... 13
6 Junction Box ... 14
7 Inspection and Test ... 14
7.1 Visual inspection ... 14
7.2 Electrical inspection ... 15
7.3 Test ... 15
8 Inspection Rules ... 17
8.1 General ... 17
8.2 Inspection classification ... 17
8.3 Exit-factory inspection ... 18
8.4 Type inspection ... 18
8.5 Sampling ... 18
8.6 Inspection items ... 18
9 Preparation before Delivery ... 19
10 Information of Vendor ... 20
10.1 Drawings and technical data ... 20
10.2 Curves ... 21
Liquefied Natural Gas Cryogenic Submersible Pumps
1 Scope
This Standard specifies the terms and definitions, type and model, technical requirements,
junction boxes, inspection and test, inspection rules, preparations before delivery, and seller's
information of cryogenic submersible pumps for transporting liquefied natural gas (LNG).
This Standard applies to submersible centrifugal pumps for transporting liquefied natural gas
(LNG) (hereinafter referred to as submersible pumps).
2 Normative References
The following documents are essential to the application of this Document. For the dated
documents, only the versions with the dates indicated are applicable to this Document; for the
undated documents, only the latest version (including all the amendments) is applicable to this
Document.
GB/T 191 Packaging – Pictorial marking for handling of goods
GB/T 755-2019 Rotating electrical machines - Rating and performance
GB/T 1032-2012 Test procedures for three-phase induction motors
GB/T 1974 Tangential keys and keyways
GB/T 2828.1 Sampling procedures for inspection by attribute – Part 1: Sampling schemes
indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 3215-2019 Centrifugal pumps for petroleum, petrochemical and natural gas industry
GB/T 3216 Rotodynamic pumps – Hydraulic performance acceptance tests – Grade 1, 2
and 3
GB 3836.1 Explosive atmospheres – Part 1: Equipment – General Requirements
GB 3836.2 Explosive atmospheres – Part 2: Equipment protection by flameproof
enclosures “d”
GB 3836.3 Explosive atmospheres – Part 3: Equipment protection by increased safety “e”
GB/T 4942.1 Degrees of protection provided by the integral design of rotating electrical
machined (IP code) – Classification
GB/T 6391 Rolling bearings – Dynamic load ratings and rating life
GB/T 7306.2 Pipe threads with 55° thread angle where pressure-tight joints are made on
the threads – Part 2: Taper internal and external threads
GB/T 7307 Pipe threads with 55° thread angle where pressure-tight joints are made on the
threads
GB/T 9124 (all parts) Specification for steel pipe flanges
GB/T 9125 (all parts) Fasteners for pipe flange joints
GB/T 9126 Dimensions of non-metallic flat gaskets for pipe flanges
GB/T 9239.1-2006 Mechanical vibration – Balance quality requirements for rotors in a
constant (rigid) state – Part 1: Specification and verification of balance tolerances
GB/T 13306 Plate
GB/T 19204 General characteristics of liquefied natural gas
GB/T 22670 Test procedures for converter-fed three phase cage induction motors
GB/T 22719.1 Interturn insulation of random-wound winding for AC low-voltage
electrical machines – Part 1: Test methods
GB/T 29529-2013 Methods of measuring and evaluating noise of pumps
GB/T 29531-2013 Methods of measuring and evaluating vibration of pumps
JB/T 6880.2 Steel castings for pumps
JB/T 6913 Cleanliness of pump products
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 3215-2019 and the
following apply.
3.1 Sump
A sealed metallic container for installing submersible pumps.
3.2 Thermal transient working condition
The working conditions in which the fluid temperature in the pump changes due to compression,
throttling, friction, etc.
a) Based on the center of the first-stage impeller of the submersible pump, the submerged
depth shall not exceed 20m:
b) Medium temperature is no lower than -196°C, and no higher than -110°C:
c) The submersible pump operates within the range of 70%~120% of the rated flow.
5.1.3 The performance of the submersible pump is based on the specified speed.
5.1.4 The NPSH3 value at the specified point of the submersible pump shall not exceed the
guaranteed NPSHR value.
5.1.5 During the operation of the submersible pump, the change of power supply voltage and
frequency and its influence on the performance of the motor and the limit of temperature rise
shall comply with the provisions of GB/T 755-2019.
5.1.6 Under specified operating conditions, the mean time between failures of submersible
pumps shall be no less than 5000h.
5.1.7 The design of the submersible pump shall meet the following requirements:
--- Thermal transient working conditions shall comply with the provisions of GB/T 19204;
--- During the hydrostatic test, the maximum allowable working pressure of the pressure-
bearing parts shall be less than 90% of the elastic limit stress of the materials used for
the parts at 293K;
--- Connecting flanges, fasteners (nuts and bolts) and gaskets shall comply with the
provisions of GB/T 9124 (all parts), GB/T 9125 (all parts) and GB/T 9126.
5.1.8 The submersible pump shall be able to work at the maximum continuous speed. The
maximum continuous speed shall meet the following requirements:
a) It is equal to the corresponding synchronous speed under the condition of the maximum
supply frequency of the motor;
b) For variable-speed submersible pumps and fixed-speed submersible pumps that may
overspeed, it shall be no lower than 110% of their rated speed.
5.1.9 Submersible pumps should have a stable head-flow curve for all application conditions.
5.1.10 The rated flow point of the submersible pump shall be within the range of 80%~110%
of the flow rate of the best efficiency point of the provided submersible pump.
5.1.11 The enclosure protection level of the submersible pump shall be IP50 or above specified
in GB/T 4942.1.
5.1.12 The rating of the submersible pump is the continuous rating based on the continuous
5.3.2.4 The length of the first pipeline threaded or welded to the shell should not exceed 150mm.
For DN25 and smaller, it shall be at least Sch160 seamless pipe; and for DN40, it shall be at
least Sch80 seamless pipe.
5.4 Rotor
5.4.1 The impeller shall be designed as a closed structure; and the inlet end of the blade shall
be a round head.
5.4.2 The impeller and shaft shall be connected by key; and no pin shall be used to fix the
impeller to the shaft. Clamping sleeves may be used with purchaser approval. During normal
rotation, the fastening device shall use the re...