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Each drain valve shall be bypassed with a line with a continuous orifice. The drain piping shall be sloped in the direction of flow away from the steam turbine. This connection can be used with the drains in the asne as a bleed-off point for warming the motive steam line during start-up.
Sprays shall not be released for automatic control at loads where it can be determined that it is relatively asmf in reducing final steam temperature. The system also includes alternate drains to the condenser for start-up, shutdown, and emergency conditions.
The practices address damage due to water, wet steam, and steam backflow into a steam turbine. Dump flow shall be directed away from turbine components by properly designed spargers, baffles, and flow deflectors.
The steam dump should be designed to disperse sufficient incoming steam energy to avoid backflow towards the turbine. Care shall be taken to orient the vanes of the grid to avoid an upward flow component. Figures 12 and 13 show a typical arrangement for these block valves.
ASME TDP-1 2013.pdf
A visual check of the turbine supervisory 5. For plant cycles in which the DC heater is supplied from the same extraction line as the feed pump turbine or other unit auxiliaries air preheating, station heating, etc. Side or axial exhaust or ducted turbine 3. When a steam turbine is to be restarted shortly after a trip from load, the operator should decide whether the steam line drains need to be opened to eliminate water accumulations.
Damage can be minimized if prompt and decisive action is taken at the first warning of water induction into a turbine. At least once a year, this inspection shall include verification that control room indication of valve position is working as intended by physical checks of the actual valve movement. Acceptable combinations of the following items are a and bor a and c: Therefore, at least two [paras. Advances in power plant 2060, most notably combined cycle, multiple steam generators, cycling, cogeneration technology, and modern plant instrumentation and control systems, convinced the Committee to again revise the Standard.
Bypass systems discharging to vessels or process steam systems other than cold reheat or any other line connected back to the steam turbine shall be designed to prevent backup of water due to vessel or process steam line high water level.
The number of nonreturn valves is to be determined by the main steam turbine manufacturer. Errata to codes and standards may be posted on the ASME Web site under the Committee Pages to provide corrections to incorrectly published items, or to correct typographical or grammatical errors in codes and standards. An operator training review is recommended 3. The broad acceptance that this Standard has received caused ASME to decide to reissue it in mandatory language rather than a recommended practice.
If an inappropriate action is taken, an alarm shall be provided. Realizing the common need for a uniform set of design criteria to alleviate this problem, an American Society of Mechanical Engineers ASME StandardsCommittee was formed, consisting of representatives of utilities, equipment manufacturers, and design consultants to develop recommended practices for use in the electric generating industry.
Careshall betaken in routing drains together from different sections of a pipe line that can experience extreme differences in pressure due to closing of isolation valves. The opportunity exists for water to accumulate in the pendant elements of the superheater during low load operation from either condensation or overspraying.
The high-high alarm is a warning to investigate and shut off the source of water. Thefollowing design guidelines are provided to assist designers in developing piping systems to prevent the induction of water into the main steam turbine through auxiliary drive turbine throttle steam supply lines.
Drain pots may also be used to assist gravity drainage for systems with low-pressure differentials. The following features shall be incorporated into the automatic heater shell side drain system: Care shall be taken not to include any volume of the extraction line in this determination. Piping downstream of an attemperator station shall be configured to maximize mixing and evaporation of the attemperator spray.
Preventing Turbine Water Damage: TDP-1 Updated
Thank you for interesting in our services. Any 206 low points in the extraction piping between the block valve and the heater shall be similarly drained. The following examples illustrate this principle using high level conditions: The Committee Pages can be found at http: This revision was approved as an American National Standard on November 6, When differential pressures are very low, the drain ssme shall be designed to allow complete drainage by gravity flow.
Criteria that should be considered include the following: These heaters are often provided with a separate storage tank. The features may be programmed into the plant control system or may be operator procedures or a combination thereof. Any additional valving in the line to the condenser shall also be forced open.
A level switch may replace one of the transmitters to generate the third level signal. Size px x x x x The high-high alarm shall be an indication that the heater isolation system second line of defense has been called into operation. The system normally includes piping to route high pressure turbine gland leakoff steam to the low aske turbine glands. This turbine may exhaust into the steam cycle, to a process, or to a condenser.
ASME TDP-1 pdf – Free Download PDF
The recommendations are not intended to relieve designers, operators, and manufacturers of the responsibility to continue their hdp to improve unit safety and reliability. The sources treated herein specifically are those found to be most frequently involved in causing damage to turbines. In general, the protection arrangement canbe a combination of thefollowingitems a qsme bor a and c: A power-operated drain valve shall be 3. Operating recommendations provided in this section are based on generic requirements because of tddp many variations in equipment and unit system designs and the varying needs of different system grids.
Typical start-up systems for once-through boilers are shown in Figs. Overreliance on automatic features has resulted in turbine water induction incidences. Condensers may be of the following types: