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GB/T 19410-2008Screw refrigerant compressors (English PDF)

螺杆式制冷压缩机

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

November 12, 2008

Implementation date

May 1, 2009

Scope

GB/T 19410-2008 is the English-translated version of 螺杆式制冷压缩机.

GB/T 19410-2008 covers screw refrigerant compressors and screw refrigerant compressor units, fixing their terms and definitions, classification and basic parameters, technical requirements, test methods, inspection rules and the rules for marking, packaging and storage.

Clause 1 limits its application to compressors and units working with R717, R22, R134a, R404A, R407C, R410A and R507A, adds that it may be used for reference for other refrigerants such as R290 and R1270, and excludes compound screw refrigerant compressors and compound units.

Its contents list clause 4 on classification and basic parameters, clause 5 on technical requirements, clause 6 on test methods, clause 7 on inspection rules and clause 8 on labelling, packaging, transportation and storage.

Clause 5 requires refrigerating capacity and coefficient of refrigerating performance to be no less than 95 % of the declared value under the nominal conditions of Table 1, calls for partial-load tests at the 25 %, 50 % and 75 % levels, asks for a full performance curve or table covering at least five condensing temperatures with at least seven evaporating temperatures each, caps oil seepage at the shaft seal of open-type machines at 3 mL/h, and sets limits on volume flow, noise, vibration and motor winding temperature.

Tightness is proved by an air tightness test whose method depends on the leak detection medium, the single-point leakage rate being held to 14 g/a when a refrigerant tracer gas is used and a helium leak detector being set to a sensitivity of 2.0 x 10^-6 Pa.m3/s.

Five normative appendices give the procedures for the air tightness test, the pneumatic test, the hydraulic test, the burst test and the measurement of vibration values, the burst pressure being at least five times the design pressure for a compressor without a safety valve and three times the safety valve relief pressure for one with it.

Clause 8 also lists what must appear on the nameplate of a compressor and of a unit, what must be marked on the packing case and which certificate and manual have to travel with the product.

It replaces GB/T 19410-2003, was issued on November 12, 2008 and has applied since May 1, 2009.

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Document preview — GB/T 19410-2008

National Standard of the People's Republic of China

ICS: 23.140
Classification: J 72
Replacing: GB/T 19410-2003

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope5
2 Normative references5
3 Terms and definitions6
4 Classification and basic parameters7
5 Technical requirements8
6 Test methods13
7 Inspection rules15
8 Labeling, packaging, transportation and storage17
Appendix A (Normative) Air tightness test20
Appendix B (Normative) Pneumatic test22
Appendix C (Normative) Hydraulic test23
Appendix D (Normative) Burst test24
Appendix E (Normative) Vibration value measurement method26

1 Scope

This standard specifies the terms and definitions, classification and basic parameters, technical requirements, test methods, inspection rules and markings, packaging and storage of screw refrigerant compressors and screw refrigerant compressor units.

This standard applies to screw refrigerant compressors (hereinafter referred to as compressors) and screw refrigerant compressor units (hereinafter referred to as units) using R717, R22, R134a, R404A, R407C, R410A and R507A as refrigerants.

For compressors and compressor units using other refrigerants (such as R290 and R1270), this standard can be used for reference.

This standard does not apply to compound screw refrigerant compressors and compound screw refrigerant compressor units.

2 Normative references

The clauses in the following documents become the clauses of this standard through reference in this standard. For all the referenced documents with dates, all the subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all the referenced documents without dates, the latest versions are applicable to this standard.

GB 150 Steel pressure vessels

GB 151 Tubular heat exchangers

GB/T 191 Packaging - Pictorial marking for handling of goods (GB/T 191-2000, eqv ISO 780:1997)

GB 536 Liquefied anhydrous ammonia

GB 755 Rotating electrical machines - Rating and performance (GB 755-2000, idt IEC 60034-1:1996)

GB/T 1032 Test methods for three-phase asynchronous motors

5 Technical requirements

5.2.1.1 The compressor and the unit shall be tested in accordance with the method in 6.7 to determine the refrigerating capacity, refrigerating performance coefficient and shaft power or input power under nominal conditions.

5.2.1.2 When the compressor and the unit are tested under the nominal conditions specified in Table 1, the maximum deviation of their performance values shall comply with the following provisions:

a) The refrigerating capacity shall not be less than 95% of the indicated value;

b) The coefficient of refrigerating performance shall not be less than 95% of the indicated value.

5.2.2 Partial load operation test requirements

Compressors and units with energy regulating devices shall be subject to partial load operation test in accordance with 6.7.2. Partial load is generally divided into three levels:

25%, 50% and 75% (if it is not possible to classify according to this level, it can be classified according to the characteristics of the compressor and unit energy regulating device itself), and its refrigerating capacity, and shaft power or input power shall be measured according to the nominal conditions specified in Table 1.

5.2.3 Full performance requirements

The compressor and the unit shall be fully tested according to the method in 6.7.3, and a full performance curve or full performance table in accordance with the provisions of Table 1 and Table 2 shall be provided. The full performance curve or full performance table shall include the values of refrigerating capacity, refrigerating performance coefficient, and shaft power or input power at no less than 5 different condensing temperatures and no less than 7 evaporating temperatures at each condensing temperature.

5.3 Refrigerant

Refrigerants for compressors and units: R22 shall comply with the provisions of GB/T 7373; R717 shall comply with the provisions of GB/T 536; other refrigerants shall comply with the provisions of relevant standards.

5.4 Lubricating oil and lubrication system

5.4.1 Lubricating oil for compressors and units shall comply with the requirements of GB/T 16630 or relevant standards.

5.4.2 The lubrication system shall be able to ensure that the compressor and the unit can operate normally and reliably.

5.5 Electric motor

5.5.1 The electric motors for open-type compressors shall comply with the requirements of GB 755.

5.5.2 Electric motors for semi-hermetic compressors and hermetic compressors shall comply with the requirements of relevant standards.

5.6 Valves

5.6.1 The safety valve of the compressor or unit shall be sensitive, leak-proof, safe and reliable, and comply with the requirements of GB/T 12241 or relevant standards.

5.6.2 The refrigeration stop valve installed on the compressor or unit shall comply with the requirements of JB/T 7245 or relevant standards.

5.7 Pressure vessels

The pressure vessels used in conjunction with the unit shall comply with the requirements of pressure vessel standards such as JB/T 4750 or GB 150, and GB 151.

5.8 Sealing requirements

5.8.1 Compressors and units shall be sealed. The oil seepage at the shaft seal of the open-type compressor and the unit shall not exceed 3 mL/h when in operation.

5.8.2 To ensure the tightness of the compressor and the unit, the compressor and the unit shall be subjected to an air tightness test. The airtightness requirements shall be determined according to the filled leak detection medium. Their requirements are as follows:

a) When the leak detection medium is dry, clean air, nitrogen or other inert gas, the compressor, unit or compressor housing and other pressure-bearing parts shall be subjected to an air tightness test at a test pressure not lower than the design pressure of the compressor, and there shall be no leakage in all parts during the test;

b) When the leak detection medium is a mixed gas of dry, clean air (or inert gas such as nitrogen) containing refrigerant such as R22 (partial pressure not less than 10%), the pressure-bearing parts such as the compressor, unit or compressor housing shall be subjected to an airtightness test at a test pressure not less than the design pressure of the compressor. During the test, when each part is detected with a refrigerant leak detector with a sensitivity of 1 x 10^-5 (MPa . cm3)/s, the single-point leakage rate shall not be greater than 14 g/a;

c) When the leak detection medium is helium, the pressure-bearing parts such as

other pressure-bearing parts to a hydraulic test of 1.25 times the design pressure or a pneumatic test of 1.15 times the design pressure.

5.10 Operation requirements

The compressor or unit shall be tested for operation. Its operation shall be stable, without abnormal noise and severe vibration; the regulating device shall be flexible and correct; the pressure, input power and temperature shall not fluctuate abnormally, and the friction parts shall not have an abnormal temperature rise, etc. The unit assembled from the compressor that has passed the operation test does not need to be tested for operation.

5.11 Volume flow

The volume flow of the compressor or unit shall not be less than 95% of the value indicated by the manufacturer.

5.12 Noise limit

The noise value of the compressor or unit under nominal conditions shall not be greater than the value indicated by the manufacturer.

5.13 Vibration limit

The vibration value of the compressor or unit shall not be greater than the vibration limit specified by the manufacturer.

5.14 Safety performance

5.14.1 The safety requirements for refrigerants shall comply with the provisions of GB/T 7778.

5.14.2 The safety requirements for compressors or units shall comply with the provisions of GB 9237 and related standards.

5.14.3 Electrical safety performance

5.14.3.1 Winding temperature limits

When the compressor or unit is operating under the nominal refrigerating conditions specified in Table 1, the motor winding temperature shall not be higher than that specified in Table 3.

7 Inspection rules

affects its performance, the first product shall be subjected to type inspection.

7.5.2 For compressors or units with a nominal refrigerating capacity of more than 800 kW at high temperature (low condensing pressure) or a rated voltage of 3000 V and above, the type inspection may be carried out at the site of use.

8 Labeling, packaging, transportation and storage

8.1 Labeling

8.1.1 Each compressor or unit shall have a durable nameplate fixed in a conspicuous position. The size and technical requirements of the nameplate shall comply with the provisions of GB/T 13306. The following information shall be marked on the nameplate:

8.1.2 The compressor or unit shall have signs indicating the operating status (such as the rotation direction of the compressor and oil pump, the flow direction of cooling water, indicating instruments and various control buttons) and safety signs (such as grounding devices and warning signs) on relevant parts.

8.1.1.1 Compressor

a) Manufacturer's name and trademark;

b) Product name and model;

c) Main technical parameters (refrigerant, theoretical volume flow, maximum working pressure, speed, mass of the compressor);

d) Product factory serial number;

e) Date of manufacture of the product.

8.1.1.2 Compressor unit

a) Manufacturer's name and trademark;

b) Product name and model;

c) Main technical parameters (refrigerant, nominal conditions, nominal refrigerating capacity, motor rated power, mass of the unit);

d) Product factory serial number;

e) Date of manufacture of the product.

8.2 Packaging

8.2.1 The compressor or unit shall be cleaned, dried, and rust-proofed before packaging, and then filled with 0.03 MPa~0.05 MPa (gauge pressure) of dry nitrogen or corresponding refrigerant gas (except dangerous ones).

8.2.2 The packaging of compressors or units shall comply with the requirements of GB/T 13384; in addition, the outer surface of the compressors or units shall be covered with plastic film or moisture-proof paper, and spare wearing parts and tools shall be coated with anti-rust oil, packaged and fixed in boxes to ensure that they will not be damaged or affected by moisture during normal storage and transportation.

8.2.3 The following information shall be clearly marked on the packaging box:

a) Name of the shipping station and manufacturer;

b) Name of the destination station and consignee;

c) Product name and model;

d) Net mass and gross mass;

e) Overall dimensions;

f) "Handle with care", "Center of gravity", "Upward", "Lifting position" and "Afraid of moisture" and other related packaging, storage and transportation marks. The packaging marks shall comply with the relevant provisions of GB/T 6388 and GB/T 191.

8.2.4 The following documents and accessories shall be included in the packaging box: […]

8.2.4.1 Product certificate, which includes

a) Product name and model;

b) Product factory serial number;

c) Inspection conclusions;

d) Signature of the inspector and person in charge of inspection and the date;

e) Name of manufacturer.

8.2.4.2 Product manual, which includes

a) Product name and model, working principle, the scope of application, implementation standards, main technical parameters (nominal refrigerating capacity, motor rated power, nominal performance coefficient, rated operating current, nominal noise value, nominal vibration value) and performance

Appendix A (Normative) Air tightness test

A.1 The air tightness test shall be carried out only after the compressor housing and other pressure-bearing parts have passed the strength test.

A.2 It is strictly forbidden to use oxygen and other dangerous gases as test gases.

A.3 The test pressure shall not be lower than the design pressure of the compressor.

A.4 The method of air tightness test shall be determined according to the filled leak detection medium. The methods are as follows:

a) When the leak detection medium is dry, clean air, nitrogen or other inert gas, the air tightness test method is as follows:

Slowly pressurize the tested compressor, unit or compressor housing and other pressure-bearing parts. When the gas pressure rises to the test pressure, put the compressor, unit or compressor housing into a water pool of not less than 5 °C (the water shall be clean and transparent) or apply foaming liquid on the outside, maintain the pressure for not less than 2 minutes, and check that there shall be no leakage;

b) When the leak detection medium is a mixture of dry, clean air (or inert gas such as nitrogen) containing refrigerant such as R22 (partial pressure not less than 10%), the test environment temperature shall be within the range of 25 °C±10 °C, and the air tightness test method is as follows:

Slowly pressurize the tested compressor, unit or compressor housing and other pressure-bearing parts. When the gas pressure rises to the test pressure, use a refrigerant leak detector with a sensitivity of 1 x 10^-5(MPa . cm3)/s to detect each test part. The single-point leakage rate shall not be greater than 14 g/a.

c) When the leak detection medium is helium, the method of air tightness test is as follows:

Slowly fill the tested compressor, unit or compressor housing and other pressure-bearing parts with helium. When the helium pressure rises to the test pressure, close the valve to stop the inflation, and then use the probe of a vacuum helium leak detector with the sensitivity adjusted to 2.0 x 10^-6Pa . m3/s to detect the various connection parts of the tested compressor, unit or compressor housing and other pressure-bearing parts. During the detection, the […]

Appendix B (Normative) Pneumatic test

B.1 Pneumatic test shall have safety measures.

B.2 The test pressure of the pneumatic test shall be in accordance with the provisions of 5.9.2.

B.3 When the compressor housing is subjected to a strength test, the test pressure on the high-pressure side shall be the design pressure on the high-pressure side, and the test pressure on the low-pressure side shall be the design pressure on the low-pressure side. If the high-pressure side and the low-pressure side cannot be separated during the test, the test pressure shall be the design pressure on the high-pressure side.

B.4 The medium for the pneumatic test shall be dry, clean air, nitrogen or other inert gases or mixed gases containing refrigerants such as R22 (partial pressure not less than 10%). It is strictly prohibited to use oxygen and other dangerous gases.

B.5 During the pneumatic test, the pressure shall be increased slowly. When the gas pressure rises to 10% of the test pressure, the pressure shall be maintained for no less than 2 minutes, and then the initial inspection shall be carried out. The compressor housing shall not be leaking. If there is a leakage, it shall be repaired and retested. After the initial inspection is qualified, the pressure shall continue to be slowly increased to 50% of the specified test pressure, and then increased to the specified test pressure in steps of 10% of the specified test pressure. The pressure shall be maintained for no less than 1 minute. The compressor housing shall not be abnormally deformed, and then the pressure shall be reduced to the design pressure and maintained for no less than 1 minute. Then the compressor housing shall be inspected for leakage. If there is leakage, it shall be repaired and retested according to the above provisions.

B.6 The inspection method for the pneumatic test shall be in accordance with the provisions of Appendix A.

B.7 Pressure gauge accuracy

The pressure test shall be conducted with two calibrated pressure gauges of the same range. The range of the pressure gauge shall be 1.5~2 times the test pressure, the dial diameter shall be no less than 75 mm, and the accuracy shall be no less than Class 1.6.

Appendix D (Normative) Burst test

D.1 The medium for the burst test is a clean inert liquid (usually water) with a temperature not lower than 5 °C.

D.2 The burst test pressure shall be in accordance with the following provisions:

a) Compressors without safety valves: not less than 5 times the design pressure;

b) Compressors with safety valves: not less than 3 times the relief pressure of the safety valve. The relief pressure of the safety valve shall not be greater than 1.1 times the design pressure.

D.3 When the compressor housing is subjected to a burst test, the test pressure on the high-pressure side shall be the design pressure of the high-pressure side, and the test pressure on the low-pressure side shall be the design pressure of the low-pressure side.

If the high-pressure side and the low-pressure side cannot be separated during the test, the test pressure shall be the design pressure of the high-pressure side.

D.4 The method for the compressor housing burst test is as follows:

a) After the compressor housing is assembled, the flange surface and openings shall be sealed.

b) Lift the compressor housing with its exhaust port facing upward and keep it vertical.

c) Connect the water inlet pipe to the bottom sealing plate of the housing, and open the upper stop valve to exhaust air. Open the water inlet valve until water overflows from the exhaust hole. Shake the compressor housing to exhaust the air in the inner cavity, and then close the stop valve.

d) Turn on the water pump and slowly increase the test pressure. When the pressure reaches 1 MPa, stop pressurizing and check whether there is leakage. If there is leakage, take measures to eliminate it.

e) When the compressor housing has no leakage, place it in a water pool and gradually and slowly pressurize it to three stages: 1/3, 2/3, and 1 time the test pressure. The pressure shall be maintained for more than 1 minute in each stage. The compressor housing shall not have leakage or abnormal deformation. If necessary, continue to slowly pressurize until the housing

Appendix E (Normative) Vibration value measurement method

E.1 Measuring instruments

E.1.1 Requirements that the instrument shall meet: The frequency range shall be 10 Hz~500 Hz. The relative sensitivity within this frequency range is based on the relative sensitivity of 80 Hz, and the relative sensitivity of other frequencies shall be within the range of +10%~-20% of the reference sensitivity. The measurement error shall be less than ±10%.

E.1.2 Instrument calibration: Measuring instruments shall be calibrated regularly according to relevant standards.

E.2 Measurement method

E.2.1 The compressor or unit shall be installed on a platform. The installation platform and foundation shall not generate additional vibration or resonate with the compressor or unit. The vibration value of the installation platform when the compressor or unit is running shall be less than 10% of the maximum vibration value of the compressor or unit being tested.

E.2.2 Operating status of the compressor or unit during measurement: The compressor or unit shall be measured under nominal conditions, and the speed and voltage of the motor shall remain at the rated values.

E.2.3 Configuration of measuring points: Vibration measurements must be carried out at all installation locations and as close to the installation point as possible. In addition, measurements shall also be carried out at the compressor housing or at the suction and exhaust pipe joints on the housing.

E.2.4 Measurement direction: At the suction and exhaust pipe joints, vibration measurements must be carried out in three orthogonal directions; at the installation locations, measurements must be carried out in three directions (see Figure E.1).

At the suction and exhaust pipe joints, one direction must be parallel to the pipe direction at the joint. One of the other two directions shall describe the tangential movement of the compressor housing at the joint. The third direction is defined based on the orthogonality requirement. E.2.5 Measurement requirements: During measurement, the sensor of the measuring instrument shall be in good contact with the measuring point and a reliable connection […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 26 pages — is available in the English PDF.

Referenced standards

Normative references

GB 150 · GB 151 · GB 536 · GB 755

Cited by

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Editions of GB/T 19410

Edition	Title	Revision	Status
GB/T 19410-2008	Screw refrigerant compressors	current edition	Current
GB/T 19410-2003	Screw refrigerant compressors	previous edition	Superseded

This page sells the current edition, GB/T 19410-2008. Earlier editions are listed for reference only.

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