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This connection can be used with the drains in the system as a bleed-off point for warming the motive steam line during start-up. The following requirements apply to these drain manifolds: Care shall be taken to orient the vanes of the grid to avoid an upward flow component.
Motive steam lines as defined and used in this Standard do not include lines typically referred to as extraction steam and gland steam seal lines. These means of protection shall be awme prior to turbine steam admission. Because spray control valves are susceptible to leakage, an additional block valve may be installed to provide additional protection.
Dump flow shall be directed away from turbine components by properly designed spargers, baffles, and flow deflectors. During certain operating modes, the same turbine opening can supply extraction steam, depending on the pressure in the steam line gdp to the prevailing steam turbine stage pressure.
A drain located downstream of the steam 3. The transmitters can be connected to the heater by a direct connection to the heater shell or via a standpipe that cannot be isolated from the shell. The physical arrangement of instrumentation and heater drain piping shall preclude unnecessary actuation from level surges during start-up and normal operation.
A level switch may replace txp of the transmitters to generate the third level signal. Any other low points in the extraction piping between the block valve and the heater shall be similarly drained.
ASME TDP-1 2013.pdf
If a drain pump is required and its failure could possibly lead to water entering the turbine, redundant aeme pumps supplied with power from separate power sources shall be furnished, each controlled by an independent level controller actuated automatically based on drain tank level. This will result in the intentional creation of a low point to allow steam separation and water collection in the bottom of the pipe.
A contact heater that is especially designed to remove noncondensable gases is termed a deaerator. The practices address damage due to water, wet steam, and steam backflow into a steam turbine. This system may pose a risk for turbine water induction if incorrectly designed. The protection of the auxiliary drive turbine itself shall follow the requirements for steam turbines as outlined in paras.
Testing shall be done in a manner that asmr as closely as possible the actual flooding of a heater without endangering the 4. Another potential source of water results when water accumulates from condensation in pendant elements of the reheater during a low load operation.
Alternatively, wsme connection may zsme located on the condenser side wall if the steam lane is sufficiently wide to provide escape area.
No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Waste heat contained in the gas turbine exhaust is fed through a heat recovery steam generator asmf produces steam that is expanded through a condensing steam turbine to produce power.
These isolation valves shall only be opened with direct operator intervention, never by automatic preprogrammed control system action. The drain lines shall be arranged in descending order of pressure, with the drain from the highestpressure source farthest from the manifold opening at the condenser wall. The recommendations are not intended to relieve designers, operators, and manufacturers of the responsibility to continue their efforts to improve unit safety and reliability.
Please fill this form, we will try to respond as soon as possible. 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.
The practices are applicable to conventional steam cycle, combined cycle, and cogeneration plants. Steam seal lines are not considered 11 be motive steam lines and are covered in para.
Preventing Turbine Water Damage: TDP-1 Updated
All other low points on the process steam line shall be provided with automatic drainage, but drain pots or automatic drain valves are not required. These procedures should be reviewed upon changes in generating unit use i.
Ideally, manifolds shall contain drains from the same area of the cycleor turbine. The required speed of operation of these power-operated isolation and bypass valves shall be determined according to the method of para. In this case, other provisions, such as a separate drain tank, shall be made.
A power-operated drain valve shall be 3. When reviewing the location of low points, consideration shallbe given to the installed position of the piping in both the cold and hot condition. Actuation of these valves indicates that the heater drainage system described in para. The number of nonreturn valves is to be determined by the main steam turbine manufacturer.
A small turbine may include only one section. In the most common configuration, down exhaust steam turbines discharge into condensers located beneath the turbine. No attempt should be made to free a locked rotor by use of a crane or by the admission of steam to the turbine.
The valve may be automatic or remote manual, with actuation initiated by the control system automatically automatic valve or by the operator manually from the control room.
Preventing Turbine Water Damage: TDP-1 Updated
June 7, This Standard will be revised when the Society approves the issuance of a new edition. The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate.
The aame accommodates the drain tank flash tank: This was due to perceived lack of interest and use by the industry. When restarting a turbine after a distorted cylinder or bowed rotor has returned to acceptable conditions, the restart should be closely supervised following procedures recommended by the turbine manufacturer.
Some of the many types of condensers are defined in para.
They shall also have a manual override to open in the control room for use during start-up. This system enables the steam generator to operate independently of the steam turbine for turbine warm-up, trip, and possibly sustained steam generator operation without the steam turbine being in operation.
It should be noted that this drain might not be sized to handle drainage or warming of the main steam inlet piping leading up to the stop valve. Consideration shall also be given to sloping piping in the direction of flow to encourage drainage to the low point drain s. Size px x x x x They may be used in parallel with the power-operated drain valves.
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