This guideline applies to bolted joints operated at temperatures of approximately 300 °C especially for bolted joints on turbine casings and steam chests, for valve body bolts as well as for flanged joints on HP and IP steam turbines whenever they are made from heat-resisting bolt materials.

Upon agreement between plant owner and manufacturer they may also be used for other bolted joints, such as bolted joints on pipework, pressure vessels, pumps, valves etc. and such joints operated at temperatures below 300 °C if agreed between plant owner and supplier.

Depending on the range of application, the pertinent ordinances, EC Directives, Equipment Safety Law (GSG), and related ordinances, Plant Operational Safety Ordinance (BetrSichV) and accident prevention regulations shall be observed, where applicable.

In addition the requirements of German technical rules and guidelines such as TRD 106 and 309, AD Merkblatt W7 and B7, VdTÜV Merkblatt 367 and VDI 2230 shall be observed.

Bolted joints intended for use in or on gas turbines only are not covered by this guideline because they are subject to other loadings.

(2004)