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1、J IS JAPANESE I NDUSTRIAL STANDARD Translated and Published by Japanese Standards Association Safety code for small refrigerating equipment ICs 13.110; 27.200 Reference number : JIS B 8620 : 2002 (E) PROTECTED BY COPYRIGHT 9s B 8620 : 2002 Foreword This translation has been made based on the origina
2、l Japanese Industrial Standard revised by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law. Consequently JIS B 8620 : 1994 is replaced with this Standard. Date of Establishment: 1982
3、-09-01 Date of Revision: 2002-07-20 Date of Public Notice in Official Gazette: 2002-07-22 Investigated by: Japanese Industrial Standards Committee Standards Board Technical Committee on Industrial Machinery JIS B 8620 : 2002, First English edition published in 2003-09 Translated and published by: Ja
4、panese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA 2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized i
5、n any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT -,-,- B 8620 : 2002 Contents Page 1 2 3 4 5 6 6.1 6.2 7 7.5 8 8 .i 8.2 9 10 11 Scope Normative references Definitions
6、Nominal refrigerating capacity . Setting of design pressure . Materials . Mat er ials . Use limitation . Strength of each section of refrigerant facility Confirmation of design strength . Safety device High pressure cutoff device . Pressure relief device Burning apparatus and heat generation apparat
7、us . Withstand pressure. . air leakage efficiency of each section of refrigerant facility . Pressure test 11.1 Withstand pressure test . 11.2 Strength test 11.3 Airtight test 12 Marking . 1 1 1 3 3 4 4 4 5 5 6 6 7 9 9 9 9 10 11 11 (i ) PROTECTED BY COPYRIGHT JAPANESE INDUSTRIAL STANDARD JIS B 8620 :
8、 2002 Safety code for small refrigerating equipment 1 Scope This Japanese Industrial Standard specifies the construction of a part subjected to the refrigerant pressure in order to ensure the safety of refrigerant pressure on small refrigerating equipment which uses a compressor. The small refrigera
9、ting equipment refers to the refrigerating equipment of which the nominal refrigerating capacity of one refrigerant circulation system is 767 W or over to and excluding 19.3 kW and which uses the practical nonflammable and nontoxic refrigerant of which the saturation vapour pressure at the temperatu
10、re of 35 “C is over 0.2 MPa up to and including 3 MPa. However, the following are to be excluded: a) Refrigerating equipment used at the steam temperature of -60 “C or lower b) Refrigerating equipment which uses a multiple refrigerating system c) Air conditioners for automobiles Remarks : The unit o
11、f refrigerant pressure refers to gauge pressure. 2 Normative references The standards given in the following contain provisions which, through reference in this Standard, constitute provisions of this Standard. JIS B 8240 : 1986 Construction of pressure vessels for refrigeration JIS B 8270 : 1993 Pr
12、essure vessels (General standard) 3 Definitions For the purposes of this Standard, the following definitions shall apply. refrigerating equipment A set of equipment for refrigeration with a system which constitutes a refrigerating cycle through a compressor, condenser, receiver, evaporator, piping,
13、etc. including the motor which drives the compressor and the controller which controls refrigerant. Heat pump equipment is included. nominal refrigerating capacity A numeric value used as the criterion for judging the capacity of refrigerating equipment for security. refrigerant facility A section i
14、n the refrigerating equipment through which the refrigerant passes and which is subjected to the refrigerant pressure. A lubricant system subjected to the refrigerant pressure is included. compressor A machine which compresses the steam of refrigerant. The sec- tions which are united with the compre
15、ssor (a casing of an enclosed compres- sor, heat exchanger, lubricant pump, etc.) are included. pressure vessel The following sections among refrigerant facilities shall ap- ply: 1) A vessel (receiver, accumulator, oil separator, etc.) and a shell type heat exchanger (Including a shell and tube type
16、 heat exchanger), of which the internal diameter of the trunk is over 160 mm. PROTECTED BY COPYRIGHT -,-,- 2 B 8620 : 2002 2) 3) 4) A coil type heat exchanger composed of double tube or single tube, of which the internal diameter in the refrigerant side is over 160 mm. A heat exchanger with the head
17、er exceeding 160 mm in internal diameter. A vessel and a shell type heat exchanger, of which the internal diameter of the trunk is 160 mm or under and the internal volume in the refrigerant side is over 0.015 m3. A heat exchanger of lamination type, plate type and roll bond type, and others similar
18、to this, of which the inner volume in the refrigerant side is over 0.015 m3. piping Pipes which connect between components among refrigerant facilities. valve A component or device which controls the flow rate and pressure of re- frigerant (for example, a stop valve, check valve, solenoid valve, exp
19、ansion valve, pressure regulating valve). safety device A high pressure cutoff device which stops the operation of the compressor by detecting pressure directly, and a pressure relief device (for ex- ample, a safety valve, fusible plug) which releases automatically the excessive pressure exceeding t
20、he predetermined pressure when the outlet pressure of compressor reaches the predetermined pressure. high pressure section A section of the refrigerant facilities which is sub- jected to the condensing pressure due to the action of compressor. However, the following are excluded: 1) A section subjec
21、ted to the pressure of the low pressure section in an en- closed type compressor into which a high pressure section is built. An automatic expansion valve. However, for the expansion valve for heat pump, etc., the section where the secondary side of expansion valve is sub- jected to the pressure of
22、high pressure section is regarded as the high pressure section. low pressure section A section of the refrigerant facilities other than the high pressure section, including a section subjected to the intermediate pres- sure of two-stage compression. design pressure A pressure used when determining t
23、he strength or thick- ness against the pressure of each section of the refrigerant facility in designing of refrigerating equipment, which refers to a gauge pressure as the criterion of this Standard. burning apparatus An apparatus which burns gas, oil, etc. It contains a heating element of the surf
24、ace temperature of 400 “C or higher under normal- use conditions. heat generation apparatus A heating element of the surface temperature of lower than 400 “C under normal-use conditions, internal combustion engine, electric heater for defrosting, crankcase heater and any corresponding appara- tus. 5
25、) 2) PROTECTED BY COPYRIGHT 3 B 8620 : 2002 Classification of refrigerant 4 Nominal refrigerating capacity The calculation formula for nominal refrig- erating capacity shall be as follows: C 1 (1) 13900 V 3.6 C .- R= where, R : nominal refrigerating capacity (W) V : piston displacement per hour in s
26、tandard speed of revolution (m3h) In the case of two-stage compressor V H : piston displacement per hour of the cylinder in the high stage side (m3h) VL : piston displacement per hour of the cylinder in the low stage side (m3/h) C : the following constant shall apply according to the classification
27、of refrigerant. I 14.4 R134a i I I R22 I 8.5 I r- I I Others 13 9OOV, I 0.75 (ha - h b ) I Specific volume of the dry saturated steam (the steam of a dew point for the non-azeotrope mixed gas) at the temperature of -15 “C (m3/kg) Specific enthalpy of the dry saturated steam (the steam of a dew point
28、 for the non-azeotrope mixed gas) at the temperature of -15 “C (kJ/kg) Specific enthalpy of the supercooled liquid of refrigerant gas (the liquid of a boiling point of the temperature of 25 “C for the non-azeotrope mixed gas) at the condensation temperature of 30 OC, the supercooling temperature of
29、5 “C (kJ/kg) 5 Setting of design pressure 5 . 1 section of the refrigerant facility. Set up the design pressure for every high pressure section and low pressure 5 . 2 Let the design pressure of each component which constitutes the refrigerant facility be equal to the design pressure of the refrigera
30、nt facility assembled using each component, or be the pressure of not less than that. PROTECTED BY COPYRIGHT -,-,- 4 B 8620 : 2002 5 . 3 highest pressure of the followings: a) Let the design pressure value of the high pressure section be not less than the The maximum allowable working pressure of th
31、e refrigerant gas concerned to be expected in the state of usual operation. The pressure of the refrigerant gas concerned produced by the highest temperature to be expected during the shut-down period. The saturation pressure of the refrigerant gas concerned at the temperature of 43 “C (the liquid p
32、ressure of a boiling point of 43 “C for the non-azeotrope mixed gas). b) c) 5.4 highest pressure of the followings: a) Let the design pressure value of the low pressure section be not less than the The maximum allowable working pressure of the refrigerant gas concerned to be expected in the state of
33、 usual operation. The pressure of the refrigerant gas concerned produced by the highest temperature to be expected during the shut-down period. The saturation pressure of the refrigerant gas concerned at the temperature of 38 “C (the liquid pressure of a boiling point of 38 “C for the non-azeotrope
34、mixed gas). b) c) 6 Materials 6.1 Materials The refrigerant facility manufacturer shall confirm in consultation with the material manufacturer, etc. that the metallic materials to be used for the refrigerant facility are the materials specified in the column on material in Tables 3 to 5 of JIS B 824
35、0 and the materials specified in the column on material in At- tached Table 2.1 and Attached Table 2.2 of JIS B 8270 (hereafter referred to as “speci- fied materials”) or the materials having the characteristics equivalent to or better than these according to the application, and the materials confi
36、rmed as mentioned above (hereafter referred to as “confirmed materials”) shall be used. a) The specified materials shall not be used exceeding the temperature range of the allowable tensile stress value specified in Tables 3 to 5 of JIS B 8240 and Attached Table 2.1 and Attached Table 2.2 of JIS B 8
37、270. However, when the working pressure at the lowest working temperature is not more than U2.5 of the design pressure, it can be used within the range of the minimum allowable temperature specified in Table 6 of JIS B 8240. It shall be made sure that the confirmed materials are used within the rang
38、e in which they wear well and are suitable under the use conditions, such as pressure, temperature of the refrigerant facility. b) 6.2 shall be as follows: Use limitation The metallic materials to be used for the refrigerant facility a) The materials shall not be deteriorated by refrigerant, lubrica
39、nt, or any mix- ture of these. PROTECTED BY COPYRIGHT -,-,- 5 B 8620 : 2002 b) c) Aluminium alloy containing more than 2 % of magnesium shall not be used. Aluminium of less than 99.7 % in purity shall not be used for the part which is always in contact with water, except, however, when a suitable co
40、rrosion resis- tant treatment is performed. Carbon steel or low alloy steel materials containing more than 0.35 % of carbon shall not be used for the weld construction. d) 7 Strength of each section of refrigerant facility 7.1 either of the following: a) The strength of pressure vessel specified in
41、3 e) shall be in accordance with The pressure vessel shall be designed in accordance with JIS B 8240, and its strength shall meet the requirements of JIS B 8240. The strength of pressure vessel shall conform to the specification in 7.5. In this case, the confirmation pressure shall be not less than
42、5 times the design pressure. However, the confirmation pressure of the pressure vessel specified in 3 e) 4) and 5) shall be not less than 3 times the design pressure. b) 7.2 The strength of compressor, refrigerant pump and valve shall conform to the specification in 7.5. In this case, the confirmati
43、on pressure shall be not less than 3 times the design pressure. However, the confirmation pressure of the flexible section, such as a diaphragm, bellows shall be not less than 1.5 times the design pressure. 7 . 3 The strength of the vessel and heat exchanger other than the pressure vessel specified
44、in 3 e) shall be as follows: It shall conform to the specification in 7.5. In this case, the confirmation pres- sure shall be not less than 3 times the design pressure. However, for the heat ex- changer tube of which the design pressure is 3.3 MPa or under, which is composed of the copper tube of 10
45、 mm or under in diameter, of which the nominal thickness of tube is 0.4 mm or over, the procedure of 7.5 may be omitted. In this case, the sec- tion other than the heat exchanger tube shall be designed in accordance with JIS B 8240, and its strength shall meet the requirements of JIS B 8240. 7.4 a)
46、The strength of piping shall be in accordance with either of the following: The piping shall be designed in accordance with 4.4.9 of JIS B 8240, and its strength shall meet the requirements in 4.4.9 of JIS B 8240. The strength of piping shall conform to the specification in 7.5. In this case, the co
47、nfirmation pressure shall be not less than 3 times the design pressure. However, the confirmation pressure of the flexible tube shall be not less than 1.5 times the design pressure. b) 7.5 be performed as follows: a) Confirmation of design strength The confirmation of design strength shall The objec
48、t under confirmation shall be manufactured in the same shape, dimen- sions, thickness, materials and manufacturing method as those of the object manu- factured by this design. PROTECTED BY COPYRIGHT -,-,- 6 B 8620 : 2002 b) After filling the object under confirmation with liquid of room temperature
49、and removing the air completely, the confirmation pressure shall be maintained for 1 min or more by adding pressure gradually up to the Confirmation pressure. The breakdown or leakage of the object under confirmation shall not be allowed. However, when leakage of the gasket section and the mechanical seal section occur due to excess of the design pressure, this shall