JB/T 6506-1992 Technical requirements for steam turbines for geothermal power generation
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T6506-1992
Technical Conditions for Steam Turbines for Geothermal Power Generation
Published on December 21, 1992
Implementation of the Ministry of Machinery and Electronics Industry of the People's Republic of China on May 1, 1993
Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Steam Turbines for Geothermal Power Generation
1 Subject Content and Scope of Application
JB/T 6506-1992
1.1 Subject Content
This standard specifies the basic requirements for steam turbines for geothermal power generation (hereinafter referred to as steam turbines) and their main auxiliary equipment in terms of design, materials, testing and inspection.
Items not specified in this standard shall comply with GB5578 "Technical Conditions for Steam Turbines for Stationary Power Generation". When the user or manufacturer has other special requirements, the two parties shall clarify them in the order contract through negotiation. 1.2 Scope of application
This standard applies to steam turbines and their supporting auxiliary equipment that use saturated steam generated by underground hot water or steam-water mixture through a steam-water separator or expansion tank as the working fluid.
This standard does not apply to the following steam turbines for geothermal power generation: a.
Steam turbines that directly use underground dry steam as the working fluid; two-phase flow rotary turbines that directly use geothermal fluid as the working fluid; steam turbines that use geothermal fluid to heat low-boiling point organic working fluids as the working fluid. Reference standards
The relevant parts of the latest versions of the following standards, regulations or technical documents are part of this standard. GB754
GB7441
GB7520
JB3596
JB4056
JB2901
JB2900
JB2862
3 Terminology
3.1 Geothermal power generation
Turbine parameter series
Method for measuring noise of steam turbine generator in power station
Technical conditions for thermal insulation of steam turbine
Characteristic test of water jet vacuum pump
Performance test procedure of steam jet vacuum pump
Technical conditions for rust prevention of steam turbine
Technical conditions for painting of steam turbine
Technical conditions for packaging of steam turbine
A method of generating electricity by converting the heat energy carried by geothermal fluid into electrical energy. 3.2 Underground hot water
Hot water extracted from geothermal wells.
3.3 Non-condensable gas
Gas contained in geothermal fluid or geothermal steam that cannot condense into liquid form during the full thermal cycle of geothermal power generation. 3.4 Steam-water mixture
Two-phase mixture of geothermal steam and underground hot water. 3.5 Steam-water separator
Approved by the Ministry of Machinery and Electronics Industry on December 21, 1992 and implemented on May 1, 1993
JB/T6506-1992
A device that separates hot water and solid impurities in the steam-water mixture to produce wet steam. 3.6 Expander
A device that produces wet steam after hot water is decompressed, expanded and separated from steam and water. 3.7 Underground dry steam
Superheated steam extracted from geothermal wells.
3.8 Geothermal fluid
Hot water or a mixture of steam and water or dry steam extracted from a geothermal well. 3.9 Geothermal steam
Wet steam extracted from a geothermal well or wet steam produced by a steam-water separator or expansion vessel. 3.10 Gas-steam ratio
The proportion of non-condensable gases in geothermal steam, expressed as follows: , (V%) = volume of non-condensable gases in geothermal steam × 100% or gas-steam ratio
(volume ratio)
geothermal steam volume
, (W,%) = weight of non-condensable gases in geothermal steam × 100% gas-steam ratio
(weight ratio)
geothermal steam weight
3.11 Power reserve
The difference between the designed internal power of the turbine and the internal power corresponding to the turbine nameplate output. 3.12 Mixed-pressure cylinder
When a steam turbine for geothermal power generation adopts a two-stage or more expansion thermal cycle system, a cylinder with primary steam and secondary steam flowing into the steam chamber before a certain stage of the steam turbine.
3.13 Primary steam
When a steam turbine for geothermal power generation adopts a two-stage or more expansion thermal cycle system, geothermal steam generated by a primary steam-water separator or a primary expansion tank.
3.14 Secondary steam
When a steam turbine for geothermal power generation adopts a two-stage or more expansion thermal cycle system, hot water discharged from a primary steam-water separator or a primary expansion tank is passed through a third expansion tank to generate geothermal steam. 3.15 Steam-water ratio
The ratio of the weight of steam to the weight of hot water in a steam-water mixture. 3.16 Atmospheric pressure type
A layout in which the condensed water in the condenser is discharged from the hot well to the atmospheric pressure space by its own weight. 3.17 Low-level type
A layout in which the condensate in the condenser is discharged to the hot well by a condensate pump. 4 Technical requirements
4.1 General
4.1.1 When placing an order, the user shall at least provide the manufacturer with the following information as a basis for the manufacturer to design the steam turbine and its auxiliary equipment. Power station environmental conditions and climatic conditions. For basic content, see Appendix A. 4. 1. 1.1
4.1.1.2 Composition of geothermal fluid. For basic content, see Appendix B. 4.1.1.3 Gas-steam ratio of geothermal steam and chemical composition of non-condensable gas, condensate, and cooling water. For basic content, see Appendix C. 4.1.1.4 Corrosion test results of geothermal fluid on materials obtained from geothermal wells. For basic content of long-term corrosion test results, see Appendix D. 4.1.1.5
4.1.1.6
Flow rate, pressure and temperature of geothermal fluid before steam-water separator or expansion tank. Other information that the manufacturer requires the user to provide due to design needs. The thermal cycle system of the steam turbine for geothermal power generation and the steam inlet and exhaust parameters of the steam turbine shall be determined by the manufacturer and the user after technical and economic analysis. See Appendix E for several basic thermal cycle systems available. 4.1.3 The capacity of the single steam turbine shall be agreed upon by the user and the manufacturer. The nameplate output of the steam turbine shall comply with the provisions of GB754 as much as possible. If it cannot comply, it shall be agreed upon by the user and the manufacturer. 4.1.4 In order to prevent the turbine output from decreasing due to scaling or other reasons and affecting the turbine output nameplate output, the manufacturer may consider that the turbine has a power reserve of 10% to 20% when designing the turbine. 4.1.5 The manufacturer shall provide the steam quality of the turbine inlet steam to ensure the long-term continuous and safe operation of the turbine. The items are: steam mixing degree <0.5Wt%
b. Insoluble solids <5ppm (cl<1ppm, sio<1ppmFe<1ppm). The manufacturer shall provide the economic operating conditions and the maximum power of continuous operation of the turbine. 4.1.6
The manufacturer shall have clear provisions for the following operating conditions4.1.7
Operation provisions when steam parameters are higher or lower than the rated value; the lowest load allowed for long-term continuous operation: b.
Operation provisions after load shedding;
Other operating conditions that do not allow long-term continuous operation. d.
The turbine speed is allowed to run continuously for a long time within the range of 97%101% of the rated speed. 4.1.8
The manufacturer shall provide the guaranteed steam consumption value and the conditions for achieving the guaranteed steam consumption value. Under normal operating conditions, the full-radius vibration value measured on each bearing seat of the turbine shall not exceed 0.025mm. 4.1.10
The noise of the turbine during operation shall be measured according to the measurement method specified in GB7411, and the actual measured value shall be lower than 90dB (A sound level). The manufacturer shall provide a complete insulation design in accordance with the provisions of GB7520, and the user shall strictly insulate the equipment and pipelines in accordance with the requirements specified in the insulation design and insulation construction. 4.2 Turbine body
The design of the turbine body shall take into account the effects of corrosion, abrasion, water erosion and scaling of each component when it comes into contact with geothermal steam and condensate, and take measures to reduce these effects.
4.2.1 Cylinder and partition
4.2.1.1 Cylinder can be cast or welded steel plate structure. If necessary, anti-corrosion measures should be taken on the inner surface. Anti-impact plates can be installed in the parts that are susceptible to impact.
4.2.1.2 The shape of the cylinder should be avoided as much as possible. In the parts that are prone to water accumulation, solid particles deposition and corrosive gas accumulation, structures that are easy to discharge should be used.
4.2.1.3 The secondary steam inlet chamber of the mixed pressure cylinder should be designed to make the steam flow of secondary steam and primary steam mix evenly, so as to reduce additional losses and the impact of steam flow on the impact and vibration of the next stage of blades. 4.2.1.4 The partition should have dehumidification and water drainage measures. 4.2.2 Rotor and blades
4.2.2.1 The influence of stress corrosion cracking and corrosion fatigue caused by gases such as hydrogen sulfide should be considered for rotating parts, and the safety factor of materials should be carefully selected.
2 The surface of rotating parts in contact with steam should be reduced as much as possible. The surface roughness value should be reduced as much as possible in the part contacting high-speed steam flow. 4. 2. 2. 2
4.2.2.3 The distance between moving blades and stationary blades should take into account the influence of water droplets carried by steam flow on the erosion and scaling of moving blades, and the distance between moving and stationary blades should be appropriately enlarged.
4.2.2.4 Effective dehumidification measures should be adopted for moving blades and stationary blades at all levels according to the working conditions they are responsible for. 4.2.2.5 The influence of changing the natural vibration frequency of moving blades due to scaling should be considered in the design of moving blades. 4.2.2.6 The steam inlet side of the last stage or the last few stages of moving blades should adopt strengthening measures to prevent water erosion. 4.2.3 Steam seal
4.2.3.1 The end shaft seal of the steam turbine shall be able to reliably prevent geothermal steam or condensate from entering the bearing seat and oil system. 4.2.3.2 The material of the end shaft seal and the partition steam seal shall generally be stainless steel. 3
4.3 Regulation and safety system
JB/T6506—1992
4.3.1 The steam turbine for geothermal power generation generally adopts the throttling steam distribution regulation method. 4.3.2 When the rated inlet and exhaust parameters and the main steam valve are fully open, the regulation system shall be able to maintain the turbine idling, and its speed swing value shall not exceed 0.5% of the rated speed.
4.3.3 The speed inequality rate of the regulation system is 4% to 5%. 4.3.4 The speed retardation rate of the regulation system is <0.5%4.3.5 When the load is not loaded, the synchronizer shall be able to change the turbine speed within the range of -4% to +6% of the rated speed. 4.3.6 The dynamic characteristics of the steam turbine shall meet the design requirements and the speed control system shall ensure that the turbine can maintain idling when the turbine is under load. 4.3.7 Main steam valve and regulating valve
4.3.7.1 The main steam valve generally adopts a one-way check valve or butterfly valve, and the regulating valve adopts a media valve. 4.3.7.2 The structure of the main steam valve and the regulating valve shall take into account measures to prevent the valve from being stuck or sticking due to corrosion and scaling. 4.3.7.3 The opening of the main steam valve and the regulating valve shall be able to be indicated locally and automatically displayed remotely. 4.3.8 When a two-stage or more expansion circulation system is used, the regulating system shall be able to coordinate and control the opening of each regulating valve in the whole system. 4.3.9 In order to conveniently control the speed increase of the steam turbine when the unit is started, a starting bypass valve can be set. When the unit is started, under the condition that the main steam valve is closed, the flow rate of the starting bypass valve when it is fully opened should be able to reach a certain speed specified by the manufacturer. The start-up bypass valve can be placed inside or outside the main steam valve.
4.3.10 Whether the main steam valve needs to be equipped with an electric actuator shall be agreed upon by the user and the manufacturer. The installed electric actuator shall be capable of close manual operation and long-distance automatic operation.
The safety devices of the steam turbine shall include the following items unless otherwise required by the user: overspeed protection device;
axial displacement protection device;
low lubricating oil pressure protection device:
97%.
Electromagnetic cut-off device.
The operating speed of the overspeed protection device is 110% to 112% of the rated speed, and the reset speed after the action shall not be lower than the rated speed. The main steam valve shall be able to close quickly after the overspeed protection device is activated, and the speed rise value shall not exceed 14% of the rated speed. The steam turbine shall generally have the following alarm items, which will send out a signal alarm when the specified limit value is exceeded. The speed is too high;
The vibration of the bearing seat or shaft is too large;
The lubricating oil pressure is too low;
The bearing oil discharge temperature is too high;
The regulating oil pressure is too low;
The oil level in the oil tank is too low;
The oil temperature in the oil tank is too high;
The exhaust steam pressure is too high;
The water level in the steam-water separator or expansion tank is too high. 4.4 Steam-water separator
4.4.1 The design pressure of the steam-water separator shall be the opening pressure of the pressure safety device located on the main body or the high-pressure end of the same pressure source closest to the main body. The design temperature is the steam saturation temperature corresponding to the design pressure. 4.4.2 Basic matters to be considered in the design of steam-water separators. 4.4.2.1 The flow rate and steam-water ratio of the steam-water mixture at the inlet of the steam-water separator. 4.4.2.2 A structure that is easy to separate hot water and solid impurities should be used; determine a reasonable medium flow rate. So that the steam generated by the steam-water separator meets the requirements of Article 4.1.5.
JB/T 6506—1992
4.4.2.3 The internal components should be set to minimize the pressure loss of the steam. The pressure loss value should be less than 1.5% of the pressure value in the separator. 4.4.2.4 The structure should be easy to remove the impurities and scale accumulated inside. 4.4.2.5 The hot water should be able to maintain a constant water level inside the separator and be discharged continuously, that is, there should be a good water level control device and safe drainage measures.
4.5 Expander
4.5.1 The design pressure of the positive pressure expander should be the opening pressure of the pressure safety device located on the main body or the high pressure end of the same pressure source closest to the main body. The design temperature is the steam saturation temperature corresponding to the design pressure. 4.5.2 Basic matters to be considered in designing expansion tanks 4.5.2.1 The expansion tank should have sufficient space for pressure reduction and expansion; good separation structure and reasonable medium flow rate, so that the steam generated by the expansion tank meets the requirements of Article 4.1.5.
4.5.2.2 The negative pressure expansion tank should have a good seal to isolate it from the external atmosphere. 4.5.2.3 The impact of the pressure drop inside the expansion tank on the discharged hot water when the turbine load is reduced should be considered for the second level and above. 4.5.2.4 The rest shall be in accordance with the provisions of Articles 4.4.2.3 and 4.4.2.5. 4.6 Condenser
4.6.1 When the steam turbine for geothermal power generation adopts the condensing type, its condenser generally adopts a mixed condenser in which the turbine exhaust steam and cooling water are in direct contact.
The layout of the condenser can be atmospheric pressure type (generally high-position layout) or low-position type. 4.6.2
4.6.3 The spraying method of cooling water inside the condenser can be nozzle atomization or screen plate spraying, or a combination of the two. Other effective methods can also be used.
4.6.4 Basic matters to be considered in designing condensers 4.6.4.1 The content of non-condensable gases in turbine exhaust steam 4.6.4.2 The quality of cooling water
4.6.4.3 The extent to which the nozzle or screen plate spraying holes may be blocked The internal structure should be as simple as possible to facilitate maintenance and cleaning of impurities and scale accumulated inside. Nozzles or sieve plates should be easy to check and replace4. 6. 4. 4
4. 6. 4.5
Reasonably arrange the flow direction of steam and cooling water, the number of nozzles or the number of water spraying sections, etc., to achieve good heat exchange effect and minimize steam4.7 Exhaust equipment
4.7.1 When determining the type of exhaust equipment, the manufacturer should make a detailed technical and economic analysis. The user's opinions should be sought when deciding on the type to be adopted. 4.7.2 When making a technical and economic analysis, the following contents must be comprehensively considered. 4.7.2.1 The flow rate, composition and corrosiveness of the non-condensable gas to be extracted by the exhaust equipment to the material. 4.7.2.2 Whether the power station has an economical steam source that can be used as the working steam of the steam jet exhauster. 4.7.2.3 The energy consumption of the exhaust equipment and its impact on the economic efficiency of the power station. 4.7.2.4 Maintenance and service life of the exhaust equipment 4.7.3 When selecting a two-stage steam jet exhauster, the following should be considered: When the working steam of the exhauster is geothermal steam, the cooler of the exhauster should use a mixed condenser; a.
The exhaust pipe height of the steam jet exhauster should be able to prevent corrosion to the plant equipment and pollution to the environment, b.
4.7.4 When selecting a water jet exhauster, it should be considered to install more than two exhausters. 4.8 Steam-water pipelines
4.8.1 The design pressure and design temperature of the positive pressure steam-water pipeline should be the design pressure and design temperature of the equipment or container closest to the inlet side of the designed pipeline in the same pipeline system.
4.8.2 All steam pipes and valves and other parts that are prone to water accumulation should be strengthened to drain. The drainage of each route should eventually be discharged to the condenser. 4.8.3 All pipelines under negative pressure should adopt measures to prevent air infiltration. 5
JB/T6506-1992
4.8.4 In order to improve the quality of steam entering the steam turbine, a dehumidification device and a steam filter can be added to the steam pipe in front of the main steam valve when necessary. 4.8.5 The shaft seal exhaust system should be able to prevent steam condensation from polluting the environment and steam and water from penetrating into the bearing seat. 4.8.6 In order to ensure the safe operation of the steam turbine, the pipeline connecting the steam turbine should have a device to prevent the turbine from generating thrust exceeding the allowable thrust. 4.8.7 When the condenser is arranged at a high position, a drain device should be installed at the lowest water accumulation part of the exhaust pipe below the steam inlet of the condenser to continuously discharge the accumulated water in the exhaust pipe.
4.8.8 The wall thickness of all pipelines should be the sum of the wall thickness obtained by strength calculation and the margin added due to corrosion, abrasion and other factors. 4.9 Materials and Material Protection
4.9.1 When designing steam turbines and their auxiliary equipment, the manufacturer shall base the selection of materials and material protection measures on Article 4.1.1.4. 4.9.2 When the user is unable to provide the information described in Article 4.1.1.4, the user shall provide the manufacturer with the material corrosion test results of other wellbore geothermal fluids, reports on material corrosion problems caused by actual power plant operation, or laboratory simulation test data. 4.9.3 The manufacturer shall analyze the types of material corrosion and the effects of water erosion and scaling that may be caused by the medium conditions of the components based on the information provided in Article 4.1.1.4 or 4.9.2, and carefully select materials and material protection measures. 4.9.4 For parts with the following conditions, first consider using ordinary materials or taking reliable material protection measures. Non-moving parts with sufficient strength and rigidity 4.9.4.1
Parts that allow for sufficient corrosion margin in the structure 4.9.4.2
Parts that are easily replaced during on-site maintenance at the power station 4.9.4.32Www.bzxZ.net
Parts that do not affect safety if the protective measures fail between two overhauls for the base material with protective measures. 4.9.4.4
Parts that can be easily updated or repaired at the power station site after the protective measures fail. 4.9.4.5
4.9.5 Common materials for steam turbines and their auxiliary equipment for geothermal power generation. Listed in Appendix F. For reference when the manufacturer designs and selects materials. 4.10 Operation and maintenance
4.10.1 Steam turbines for geothermal power generation should be reasonably used to bear the basic load of the power grid and operate continuously for a long time under rated parameters. The number of shutdowns not within the maintenance plan should be minimized. When shutdown is necessary, air should be prevented from entering the thermal system as much as possible. 4.10.2
During normal operation of the steam turbine, monitoring should be strengthened, and the following items should be monitored with special attention: 4.10.3
Inlet and exhaust parameters:
Pressure changes in the intermediate stage of the flow section; rotor displacement and cylinder expansion;
Changes in the opening of the main steam valve and regulating valve;
Changes in the water level and drainage properties of the steam-water separator or expansion tank; e.
Changes in the quality of condensate and cooling water,
4.10.4 The main steam valve and regulating valve should be tested for micro-movement or opening and closing regularly to confirm the flexibility of the valve action. Strictly prevent accidents caused by the jamming of the valve due to corrosion and scaling. 4.10.5 The exhaust valve, safety valve and other valves should be tested for action regularly. Prevent the valve from being stuck due to corrosion or scaling. 4.10.6 Regularly check the corrosion and scaling of equipment and pipelines, and clean them in time. Equipment coated with protective coatings should be regularly checked for peeling of the protective layer.
4.10.7 Appropriate antifreeze measures should be taken for all instruments and accessories that require antifreeze. 4.10.8 The manufacturer should explain the detailed requirements for operation and maintenance in the technical documents provided, and the user should implement them according to the manufacturer's requirements.
5 Tests and inspections
5.1 The user can go to the manufacturer to witness the specified test and inspection items in accordance with the contract or relevant agreement. The manufacturer should provide the necessary information and tools for this work.
5.2 The manufacturer should notify the user in advance according to the number of days specified in the contract or relevant agreement, so that the user can go to the manufacturer to witness the test and inspection. If the user does not come to the factory on time, the manufacturer can conduct tests or inspections on its own according to the specified plan. 6
JB/T6506-1992
5.3 The manufacturer shall complete the processing and assembly of all parts and components of the steam turbine and its auxiliary equipment in accordance with the drawings and relevant regulations, standards and technical documents. The parts may only be transferred to the next process after they have passed the inspection. 5.4 The adjustment and safety parts and components and other parts and components that are required to be tested in the manufacturer shall be tested in the manufacturer. The test results must meet the design requirements.
5.5 The steam turbine is generally tested at no-load in the manufacturer. 5.5.1 The steam turbine body and the adjustment and safety parts and components participating in the no-load test must be matched with this steam turbine, and the no-load test can only be carried out after passing the general assembly inspection. The parts and components that have passed the no-load test are not allowed to be exchanged with the parts and components of other units. 5.5.2 The no-load test shall be carried out strictly in accordance with the no-load test procedures formulated by the manufacturer. All inspection and assessment items of no-load test run shall be inspected item by item according to relevant inspection regulations, and the main inspection results shall be filled in the product certificate of conformity. 5.5.33
No-load test run inspection and assessment items
When using electric turning device, the first test of input and automatic release shall be carried out; static characteristic test of speed control system:
Overspeed protection test;
Axial displacement protection device action test;
Overspeed test;
Electromagnetic cut-off device action test;
Main steam valve full closing time;
Self-starting and self-closing test of each protection pump; Alarm test of each alarm device;
Should run smoothly at startup, speed increase and rated speed. In the continuous operation test, the vibration value is less than 0.025mm; Survey and map the shutdown situation curve:
Stop cylinder opening inspection.
5.6 If the above inspection and assessment items are not completed at the manufacturer when certain conditions are not met, the manufacturer and the user may negotiate and reach a consensus, and the unfinished items may be completed during the commissioning of the power plant. 5.7 The inspection department of the manufacturer shall inspect and accept each steam turbine and its auxiliary equipment in accordance with the provisions of Articles 5.3 to 5.6. After the acceptance is qualified, the product certificate shall be issued.
5.8 During the installation and commissioning stage of the power plant, the steam turbine shall be subjected to a 72-hour load test. The test items shall refer to relevant regulations and shall be jointly agreed upon by the user and the manufacturer.
5.9 When the user requires inspection or assessment test for some of the following items, the user and the manufacturer shall jointly agree on them. 5.9.1 Test items:
Turbine thermal performance test:
Steam-water separator expansion tank characteristic test:
Condenser characteristic test;
Evacuator performance test;
Oil cooler performance test,
Among the above test items, the vacuum pump performance test shall be in accordance with JB4056 or JB32596. If there is no provision for the test method, the user, the manufacturer and the test unit shall jointly negotiate to formulate the test method and test items. 5.10
National appraisal test
Test items:
Turbine thermal characteristics test;
Start-up and shutdown characteristics test;
Regulation system test;
Turbine auxiliary equipment test,
5.10.2 Test methods shall be implemented in accordance with Article 5.9.2. 6 Supply scope
6.1 General requirements for steam turbine complete set supply scope JB/T6506-1992
6.1.1 The steam turbine complete set supply scope includes two parts: steam turbine complete set supply items and random technical documents supply items. 6.1.2 The equipment in the manufacturer's complete set supply scope shall be complete and meet the technical requirements specified in this standard and the technical requirements proposed by the user in the order contract.
6.1.3 If the user has any change requirements for the items within the supply scope specified in this standard, the user and the manufacturer may negotiate together and clarify them in the order contract.
Steam turbine complete set supply items
Steam turbine main engine parts,
main steam valve, regulating valve, regulating and safety oil circuit system parts: auxiliary equipment (including steam-water separator or expansion tank, condenser, vacuum pump, oil cooler, etc.); steam-water pipelines and accessories within the supply scope shown in the thermal system diagram; random special tools;
random spare parts;
other items listed in the "supply list" by the manufacturer. Random technical documents supply items
Product technical specifications and thermal technical characteristics; product technical performance description and main technical conditions, product technical and economic indicators and guarantee conditions; product instructions (including installation, startup, operation, maintenance, shutdown, etc.); summary of main strength calculation data,
delivery acceptance items and requirements;
random drawings;
random supply drawings and technical documents list; supply items list:
product qualification certificate:
general assembly record,
parts test record,
no-load test record,
physical and chemical inspection record of large castings and forgings and important parts materials; k. Shipping packing list.
7 Guarantee and warranty
7.1 Under the condition of good transportation and storage, the manufacturer's responsibility period for rust prevention of steam turbine parts is 12 months from the date of delivery. 7.2 The steam turbine should generally be installed within 12 months after the manufacturer completes delivery. The manufacturer guarantees that under the specified operating conditions, the steam turbine will operate normally within 12 months after the trial operation and there will be no defects in design, materials or workmanship. 7.3 The total warranty period of the manufacturer is generally 30 months after delivery. 7.4 If any design and manufacturing quality problems are found during the guarantee and warranty period that the turbine cannot operate normally or parts are damaged, the manufacturer shall be responsible for free repair or replacement of parts.
7.5 If the turbine flow passage is seriously scaled, the nozzle or screen plate hole in the condenser is blocked, affecting the normal operation of the turbine, the user shall take anti-scaling and anti-blocking measures or shorten the maintenance cycle to solve the problem. JB/T6506-1992
7.6 The first overhaul of the turbine shall be carried out 12 months after commissioning. The overhaul cycle of the turbine shall be 18 months thereafter. 8 Marking, packaging, transportation and storage
8.1 Marking
8.1.1 The turbine and its auxiliary equipment shall have a fixed nameplate. The size and material of the nameplate shall comply with relevant regulations. 8.1.2 The items and technical specifications to be marked on the nameplate shall comply with the requirements of the drawing, and the marking shall be clear and eye-catching. 8.1.3 Adjustment and safety parts, important valves, etc. should have clear and easy-to-recognize instructions and signs indicating their travel, rotation angle, operation direction, etc. Parts that may cause danger during transportation or maintenance must have eye-catching special signs. 8.1.4 Important parts should be marked with assembly numbers, materials used and inspection pass marks at certain positions according to the drawings. 8.2 Packaging and transportation
8.2.1 Steam turbines and their auxiliary equipment should obtain factory certificates. Spare parts, random tools, drawings and technical documents supplied with them are complete and can only be shipped after passing the packaging inspection. 8.2.2 The anti-rust, paint and packaging of steam turbines should comply with the relevant technical conditions in JB2901, JB2900 and JB2862. 8.2.3 When the user is located in a remote area and has special requirements for product packaging, transportation, single package weight and external size restrictions, the user should make it clear in the order contract. 8.2.4 The packaging and transportation requirements of the purchased equipment supporting the steam turbine shall comply with the relevant regulations formulated by the equipment manufacturer. 8.3 The storage and preservation of the steam turbine and its auxiliary equipment shall comply with the relevant regulations formulated by the user department. 9
Installation location:
Altitude:
Atmospheric pressure:
Cooling water
Design temperature;
Water supply method;
Annual maximum water temperature;
Annual minimum water temperature;
Water quality conditions.
Ambient temperature:
Maximum;
Minimum;
Annual average.
Wind force or basic wind pressure value:
Thickness of frozen soil layer:
Earthquake intensity:
Hardness (mmol/l)
Dissolved silicon dioxide (mg/1)
Free CO, (mg/l)
Total solids (mg/l)
Ignition residue (mg/l)
Total alkalinity (mmol/l)
JB/T6506—1992
Environmental and climatic conditions
(Supplement)
Composition of geothermal fluid
(Supplement)
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