DIN 33822:2017-08

The standard DIN 33822 has been prepared by Working Committee NA 032-02-04 AA "Anlagentechnik" ("Gas Systems Engineering") at DIN Standards Committee Gas Technology (NAGas). It applies to direct-acting gas pressure regulators, if necessary with associated devices such as - safety shut-off device, - thermal cut-out, - blow-off valve for leakage gas, - gas shortage protection, - gas flow monitor and for inlet pressures up to 5 bar, operating temperatures from -20 °C to +60 °C and nominal diameters up to and including DN 100 in gas installations in accordance with DVGW Technical Standards G 600 (TRGI) and G 459-2 as well as DVFG TRF2012. The requirements apply analogously to larger nominal diameters. This standard applies to gas pressure regulators that are operated with gases in accordance with DVGW Technical Standard G 260. This standard is intended as a replacement for DIN 33822:2009-02. The standard differs from DIN 33822:2009-02 as follows: a) extension of the scope of application to devices up to DN 100; b) normative references have been updated; c) reference to DIN IEC 60050-351 instead of DIN 19226 in Clause 3; d) addition of the terms "installation position" and "standard condition"; e) definition of a standard installation position; f) addition of the nominal sizes DN 65, DN 80 and DN 100; g) adaptation of the requirements for the design of the control stage(s) and the safety shut-off device in Subclause 4.1.1 to current technical developments; h) replacement of the nominal pressure PN by the maximum permissible pressure PS for the classification of the pressure stages in Subclause 4.1.5; i) omission of the pressure stage PN 4; j) deletion of the closing pressure group SG 50; k) extension of the permissible deviations of the closing pressure group of the control device at -20 °C in accordance with DIN EN 334; l) extension of the lower response pressure of the safety shut-off device at -20°C to 50 %; m) specification of the response pressure of the gas shortage protection with a response accuracy AG 30; n) clarification that the start-up behavior of gas pressure regulators with integrated gas flow monitors shall be verified for devices with and without gas shortage protection; o) clarification of the nominal flow rates to be taken into account for the start-up behavior of gas pressure regulators without integrated gas flow monitors in Subclause 4.8.9 and the corresponding test set-up in Subclause 5.13; p) deletion of the reference to DVGW in the requirements for testing laboratories, instead reference to DIN EN ISO 17025; q) clarification that the test requirements of this standard apply to the type testing; r) reformulation of the clause "Functional testing of the control stage(s)"; s) reformulation of the clause "Functional testing of the safety shut-off device"; t) modification of the test set-up for testing the start-up behavior of gas pressure regulators without integrated gas flow monitors; u) extension of the test for condensate resistance according to 5.15 and of the corrosion protection according to 5.16 to all pressure levels; v) deletion of the DVGW certification mark in the marking, inclusion of the approval numbers and the manufacturer-independent identification number; w) specification of general tolerances for the dimensional data in Annex A; x) addition of the dimensions for two-spigot union nuts in Annex A; y) reference to DVGW VP 401 instead of DIN 3535-6 for the materials for HTB-resistant gaskets in Annex A; z) individual editorial adjustments. This standard will be included in the DVGW "Gas" Codes of Practice once it has been adopted.