1、Technical delivery conditions for valves Requirements and methods of test for valves for use with flammable liquids Scope and field of application his standard applies to valves fitted to pipes through which flammable liquids are transported and for which particu- Ir requirements are specified in th
2、e relevant regulations (e.g. TRbF *) 131 Part 1, TRbF 231 Part 1, TRbF 301 and RbF 302). It specifies the requirements to be met in the manufacture of valves and describes methods of verifying impliance with these requirements. his standard does not apply to valves designed for use with liquefied ga
3、s in the liquid phase. m 3230 Part 6 Materials .1 Pressure-containing valve parts he materials listed in table 1 shall be used within the application limits (pressure ratings) specified both there and in ie relevant regulations. They shall comply with the relevant materials standards. In the absence
4、 of such standards, the iquirements shall be the subject of agreement. ,2 Obturator he obturator shall be made of one of the materials specified in table 1. able 1. Materials not exceeding 1 O bar Class 1 GGG-40 GGG-40.3 GGG-50 Material for pressure-contain ing valve parts exceeding 10 bar up to and
5、 including 25 bar Class 2 GGG-40.3 Spheroidal graphite cast iron Steel Cast steel Bolts and nuts To be used for valves rated for a permissible working pressure exceeding 25 bar Class 3 Killed grades with notched- bar impact strength within the application limits specified in the relevant A D-Merkbla
6、tt. As specified in AD-Merkbltter W 1, W 4, W 9, W 10, and W 13. GS-C25 complying with DIN 17 245. Gs-38c0mplying with DIN 1681. GS-45 As specified in AD-Merkblatt W 5. Proof of quality as specified in AD-Merkblatt W 7. I Proof of quality as specified in AD-Merkblatt W 7. Proof of quality by stampin
7、g. Other materials may be used if their suitability has been confirmed by an expertisel). I Expertises, for the purposes of this standard, are made by persons qualified as specified in the Verordnung ber brennbare Flsskeiten (Flammable Liquids Regulation I. TRbF = Technische Richtlinien fr brennbare
8、 Flssigkeiten (Code of practice for flammable liquids). Continued on pages 2 to 8 Eeuth Verlag GmbH. Berlin. has the exclusive right of aale for German Standards (DIN-Normen). DIN 3230 Part 6 Engl. Price group 7 Saler No. O1 O7 01.89 Page 2 DIN 3230 Part 6 3 Design Table 2. Desian - 3.1 As a rule, t
9、he AD-Merkbltter and DIN 3840 shall be used as the bases for valve design, taking into consideration the least favourable pressure conditions and the safety factors given in the relevant regulations. Where specified for a particular class in this table, the design drawings shall be submitted to an e
10、xpert for preliminary inspection be- fore manufacture commences, such inspec- tion not being necessary in the case of type tested valvecl). Proof of adequate design may also be provided by other means (bursting tests, strain measurements, internal pulsating pressure test). 32 AD-Merkbltter HPO,HP5/1
11、 to HP5I3 shall be taken into consideration in the manufacture of welded valves. Particular agreements shall be reached with the expert concerning the requirements regarding post- weld heat treatment specified in these docu- ments as a function of the wall thickness and the weld assessment. 3.3 The
12、rated pressure stated on the valves shall be taken as the permissible working pressure, in bar. Where valves have flanged connections complying with ANSI B 16.5, the permissible working pressure at a tem- perature of 20yC shall also be stated. Class .l Not applicable. Applies for nominal sizes excee
13、ding DN 200. To be complied with. 1) See VdToV-Merkblatt (VdTUV Instruction sheet) 1065. Class 2 Applies for nominal sizes exceeding DN 500. To be complied with. To be complied with. Class 3 Applies for nominal sizes exceeding DN 2002). To be complied with. To be complied with. 2) Checking the prope
14、r selection and processing of materials and a general design expertise are sufficient for valves with a nominal size up to DN 200. 4 Requirements and testing Table 3. Requirements 4.1 Construction 4.1.1 The stem of valves with an adjustable gland shall be designed with a back seat face, it being pos
15、sible to inspect the back seat for tightness by meansof an inspection bore with stopper, should repacking under pressure be- come necessary, 4.1.2 Threaded stoppers connecting into the parts under pressure shall have a cylindri- cal thread complying with IS0 228 Part 1, shall be sealed with metallic
16、 or metal-clad seals, metal-sheathed compressed asbestos fibre seals or seals with metallic back-up ring, be provided with a relief bore and, while un- der pressure, capable of being loosened by at least two revolutions, without this present- ing a risk. The stoppers shall be manufac- tured from a c
17、orrosion-resistant material of adequate strength (e.g. material 1.4021). Class 2 To be complied with. To be complied with. To be complied with. To be complied with. Class 3 To be complied with. To be complied with. DIN 3230 Part 6 Page 3 Table 3 (concluded). Class 3 Class 1 Class 2 4.1.3 Closed cavi
18、ties in which pressures of more than 10 % of the rated pressure may occur as a result of thermal expansion, shall be made safe by means of an appropriate re- lief device, e.g. overflow valve. To be complied with. To be complied with. To be complied with. 4.1.4 In the case of non-automatic pressure r
19、elief, the overflow valve of external relief pipes shall be flanked on either side by shut- off devices to allow maintenance work on the valve to be carried out. To be complied with. To be complied with. To be complied with. 4.1.5 Rapidly moving external components, e.g. rapidly rising stems, piston
20、 rods or levers on back pressure valves, shall be fitted with protective devices (e.g. protective tubes or protective screens). To be complied with, To be compl ied with, To be cornplied with. 4.1.6 Standby actuating elements, e.g. hand- wheels on electrical actuators or levers on piston drives shal
21、l not be actuated by remote operation. To be complied with. To be complied with, To be complied with. 4.1.7 Only chambered bonnet seals or flangeless bonnet connections shall be used for valves rated for pressures of PN 25 and above. Flangeless connections shall be de- signed to be frostproof. To be
22、 complied with. To be complied with. Not applicable. 4.1.8 Design measures shall ensure that the tightness of the valve body is not impaired as result of damage due to excessive actuating forces. 4.1.9 The interchangeability and replace- ability of internal components shall be agreed. To be complied
23、 with. To be complied with. To be complied with. To be complied with. To be complied with. To be complied with. 4.1.10 Valves of nominal size exceeding DN 300 shall be fitted with lifting eyes and with supports or similar devices, to be ar- ranged in accordance with the customers instructions. To be
24、 complied with. To be cornpl ied with. To be complied with. 4.1.11 Seals liable to come into contact with the medium transpoyted through the valve shall be suitably designed. To be complied with. To be complied with. To be complied with. 4.2 Requirements the fulfilment of which is to be checked for
25、every valve. Compliance with the requirements specified in table 4 shall be checked by the manufac- turer for every valve. To be complied with. To be complied with. To be complied with. 4.3 Requirements the fulfilment of which is to be checked by means of random testing. Compliance with the requirem
26、ents specified in table 5 shall be checked by the manufac- turer by means of random testing. To be complied with. To be complied with. To be complied with. Page 4 DIN 3230 Part 6 Table 4. Standard tests for all valves - Item testedhequirement Type of test (symbols as specified in DIN 3230 Part 3) fo
27、r valves of class 2 class 1 class 3 1 Compliance with the specification given at the time of ordering AA AA AA AB AB 2 Design, type and trim AB 3 Marking The body shall be permanently marked with the valve manufacturers symbol, the material designation, the pressure rating and the nom- inal size. In
28、 addition, a code number is to be applied to class 2 and class 3 valves. AC AC AC 4 Correctness and completeness of materials certificates The correctness and completeness of mate- rials certificates and the correspondence be- tween certificate and components shall be checked. AR AR AR 5 Surface fin
29、ish The surface shall have no defects liable to impair safety or proper functioning. A A AE _ 6 Operation 6.1 Valves shall operate faultlessly in the as delivered condition. 6.2 Class 3 valves shall operate faultlessly with the rated pressure applied on one side. AG Not applicable. AG Not applicable
30、. AG AQ (PN) A lower test pressure may be specified for special operating COI, ditions. For shut-off valves, it shall be checked, with the valve in the fully open position, whether the entire flow path is unob- structed. The maximum actu- atingforcesagreed at the time of ordering shall be verified.
31、I Marking of fully open position The fully open position shall be identifiable rom the outside. AP (only for pipelines which can be cleaned by scraping) AP (only for pipelines which can be cleaned by scraping) AP DIN 3230 Part 6 Page 5 For sizes greater than DN 200, as specified in A 0-Merkblatt HP
32、513. CB, CC or CD CA AH AD Table 4 (concluded). For sizes greater than DN 200, as specified in As specified in A D-Merkblatt AD-Merkblatt HP 5/3. HP 513. CE, CC or CD CE, CC or CD CA CA AH AH AD AD Item testedhequirement I 8 Strength of valve body The valve shall withstand the pressure in the streng
33、th test for the test duration specified in the relevant type standard without signifi- cant deformation. 9 Tightnems of valve body induding stem or shaft passage In the leakage test, the valve body shall be tight for the period specified in the relevant type standard. 10 Seat tightness 10.1 Shut-off
34、 valves In the seat leakage test, leakage rate 2 shall be achieved, unless the relevant type stand- ard specifies a different leakage rate. 10.2 Control valves A leakage rate in accordance with VDi/VDE Code of practice 2174 shall be agreed be- tween supplier and customer for control valves for use i
35、n chemical engineering. 11 Strength of obturator In the fully closed position, the obturator shall, when loaded on one side with the rated pressure or permissible working pressure for a period of at least 60 seconds, not be signifi- cantly deformed. 12 Nondestructive testing of welds as speci- fied
36、in AD-Merkblatt HP5l3. 13 Weld-ends The weldends shall have no defects liable to impair welding. 13.1 Rolled and forged steel weld-ends 13.2 Cast steel weldends 14 Errors in use of material Care shall be taken to ensure that only the correct alloys for a given application are used. 15 Wallthicknew T
37、he wall thickness shall be checked for cam- pliance with the dimensions specified in the drawings. Type of test (symbol class 1 BAor BQ BE or BK BN, but with the water not under pressure, or BO. BO as specified in DIN 3: class 2 BAor BQ BE or BK BN, but with the water not under pressure, or BO. BD I
38、 Part 3) for valves of class 3 BA or BQ If the test pressure for the pipeline is greater thar, 1,fitime the rated pressure of the valve, the valve shall be subjected to a pressure equal to 01 greater than that for the pipeline, allowinc for a safety factor o1 1 ,I in respect of the yield point. BE o
39、r BK, with minimum test duration equal to ten minutes. BN, but with the water not under pressure, or BO. 50 A BN test may be performed instead of a BD test. Page 6 DIN 3230 Part 6 Table 5. Random testing 1 Dimensions The dimensions shall be within the limits specified in the dimensional standards. 2
40、 Flanged ends Flanged ends shall comply with the require- ments specified in the relevant flange stand- ards. class 1 Type of test (symbols as specified in DIN 3230 Part 3) AD Test level 2 AF Test level 2 for valves of class 2 AD Test level 2 AF Test level 2 class 3 AD Test level 2 AF Test level 2 5
41、 Special tests The tests described below are additional tests and shall be specially agreed where necessary. Table 6. Special tests 1 Differential pressure tests The seat tightness of valves for use with long-distance pipelines, complying with TRbF 301, which are to be subjected to the differential
42、pressure test, shall be tested for two hours using water, at a differential pressure of 0.1 bar. Apart from temperature-induced pressure changes, there shall be no drop in differential pressure. The test pressure shall be equal to 0,5 times the rated pressure, at least 20 bar, but shall not exceed t
43、he rated pressure. 2 Block and bleed test The sealing of the obturator against the valve body interior which is not under pressure, shall be tested with the test pressure (water at rated pressure) applied to both sides. For a test duration of 10 minutes, the leakage rate shall be as specified in DIN
44、 3230 Part 3. DIN 3230 Part 6 Page 7 6 Certificates Table 7. Certificates - 6.1 Materiais Certificates in accordance with AD-Merkblt- ter, 6.2 Non-destructive testing The results of nondestructive testing shall be attested to by at least inspection certificate B as specified in DIN 50049. 6.3 Accept
45、ance inspection The following certificates shall be submitted for the tests specified in tables 4 and 5. 6.4 Type tested valves, in accordance with VdT(V-Merkblatt 1065: a) materials b) acceptance inspection Class 1 As specified in AD-Merkblatt A 4. To be complied with. As specified in A O-Merkblatt
46、 A 4. As specified in AD-Merkblatt A 4. As specified in AD-Merkblatt A 4. Class 2 As specified in AD-Merkblatt A 4. To be complied with. Inspection certifi- cate B as specified in DIN 50049. As specified in AD-Merkblatt A 4. As specified in AD-Merkblatt A 4. Class 3 As specified in AD-Merkbltter W O
47、, w 1, w 312, w 4, w 5, w 7, w 9, w IO, W 13. To be complied with. Inspection certifi- cate as specified in DIN 50049 B for nominal sizes not greater than DN 200“), and A for nominal sizes greater than DN 200“). According to the specifications rel- evant for the compo- nent test. Inspection certific
48、ate B as specified in DIN 50049. Standards and other documents referred to DIN 1681 Cast steels for general purposes; technical delivery conditions DIN DIN 3840 Valve bodies; calculation of resistance to internal pressure DIN 17245 Heat resisting ferritic cast steel; technical delivery conditions DI
49、N 50049 Materials testing certificates is0 228 Part 1 A D-Merkbltter A 4 Gehause von Armaturen (Valve bodies) HP O Aligerneine Grundstze fr Auslegung, Herstellung und erstmaI arbeitstechnische Grundstze (Manufacture and testing of joints; principles) H P 512 Herstellung und Prfung der Verbindungen; Arbeitsprfung an Schweinhten, Prfung des Grundwerkstoffes nach Wrmebehandlung nach dem Schweien (Manufacture and testing of joints; inspection of welds; testing of parent metal after postweld heat treatment) of joints; non-destructive
