la COMUNITAT EDUCATIVA
2.4.4. Intel·ligències múltiples de Gardner
With respect to the guarantees, acceptance tests and tolerances, the appropriate IEC recommendations or the valid national
standards to be given by the Contractor will apply as far as they do not contradict to this specification.
Closed loop control systems
All control loops shall be stable for all operating conditions and in all load ranges, and shall have optimum performance in compli-ance with the present standards. Due to interconnections, the control loops assigned to the main controlled variables shall not be considered as separate units.
They shall be matched in such a way that optimum control of the unit is accomplished in compliance with the requirements.
For closed loop control systems the quality of control shall be such that for the load changes specified, not only shall control parameter overshoot values not exceed the amount specified below but also that all such overshoot values shall return to the set value in a sinusoidal manner at a rate of not more than 35% in wave amplitude for each successive half cycle, giving steady state conditions after 3 cycles of overshoot.
The Contractor shall also demonstrate during the trial operation period that the various control systems meet the specified guarantees. The magnitude of the overshoots to be guaranteed is specified for constant load and load variations in the following text.
Definition:
Load variation means change in fuel feed with a maximum rate of change of 10% live-steam flow per minute. limited to 3 minutes within the possible load range of the boiler.
Overshoots
a) Live-steam temperature:
constant load K ±4
• load variation K ±10
b) Live-steam pressure: bar 145
• constant load bar ± 1
• load variation bar ±4
B0/FG-1
g) load variation Steam pressure and steam temperature reducing
station HP bypass control bar/
oC
• constant load ±1.5/±5
• load variation bar/o
C ± 3/ ± 10 Under all operating conditions, the noise level of control valves dB
(A) 85
shall not exceed measured at one meter distance.
To make sure that the permissible noise level is under no circumstances exceeded, the requirements in respect of the pipeline and insulation design to be fulfilled by the piping an insulation contractor shall be specified by the Contractor with the tender.
Other control and monitoring systems
The Contractor shall guarantee that the equipment provided is within the tolerances stated in the specification. The Contractor shall also guarantee that the equipment carries out in a safe and efficient manner the task for which it is provided.
The quoted values data shall be guaranteed.
Testing procedures
All components supplied shall be tested in accordance with the requirements and the individual guarantees and the general performance of the installation shall be demonstrated at the tests during erection and the acceptance and performance tests.
BPDB, Barapukuria Power Plant 250 MW Section B0: General Specification
Design Data and Guarantees for I&C Equipment Acceptance tests serve to provide evidence of the warranted
Acceptance tests shall be performed for the closed loop control
system only.
For all other parts and systems, successful and faultless functioning during the time of completion, first start-up and the
trial runs and random acceptance tests shall be taken as an
acceptance test.
The Client or his representative will perform tests on completion
in accordance with the requirements specified in the contract,
How well the supplied control equipment and the controlled
system work together under operating conditions will be checked
during the control process.
The control process is the variation of the controlled variable in
time under the influence of intentional (test) disturbances and/or
operational disturbances .
The acceptance test is a comparison between the warranted and
measured control process.
The acceptance test is successfully performed if the total of
disturbance influences, including the test disturbance and the
influences caused by the test disturbance in the system, are
Bidder/Contractor
Unit Data
under control to a degree whereby the warranties concerning the
control quality are fulfilled.
As measurement tolerances, ±1% of the set values to be warranted are permissible.
The acceptance test shall be repeated if, due to extraordinary
disturbances in operation during the test, the control process
does not correspond to the control process under normal operating conditions.
BPDB, Barapukuria Power Plant 250 MW Bidder/Contractor
Section BO: General Specification
Design Data and Guarantees for I&C Equipment Unit Data
If the main performance data are not fulfilled during the accep-tance tests, the Contractor shall be obliged as a first measure to improve the supplied control equipment by suitable control Owner/Owner's Representativeing measures making full use of all theoretical and equipment Owner/Owner's
Representativeing possibilities e.g. by load dependent parameter variation disturbance variable feed forward further optimization efforts
• modification of characteristics curve of control valves and actuators etc.
For this purposes the Contractor is given the chance to modify the equipment in a reasonable time specified by the Client according to the system operation needs.
If, after final optimization, the quality of the closed loop control does not meet the requirements the Contractor shall be obliged to take the actual transient functions at the plant and to compute the theoretical possible quality of the control loops based on the actual data.
The Contractor of the equipment involved, the Client and/or his representative reserve the right to participate in these tests.
If the actual achieved control deviation does not exceed those based on the theoretically calculated possible control quality, the requirements shall be considered as fulfilled.
Should the plant fail to meet the above guarantees after due account has been taken of the above specified tolerances, the plant will be made available to the Contractor so as to allow the Contractor to make good the plant by modifying or replacing defective or wrongly designed parts.
If, even after remedial measures have been carried out, the required guaranteed values are not achieved, then the client shall be entitled to reject the complete plant or parts thereof.
BPDB, Barapukuria Power Plant 250 MW Bidder/ Contractor Section B0: General Specification
Guarantees Data- Water Storage and Treatment Systems Unit Data
(to be completed by the Bidder) Demineralization water plant
Net continues flow rate each line at design conditions m3/h Net treated water volume per cycle each line m3
Cycle length (service time) h
Regeneration time h
Chemical consumption cation/anion per regeneration:
• HCI 100% each line kg/cycle
• NaOH 100% each line kg/cycle
Chemical consumption mixed bed per regeneration:
• HCI 100% each line kg/cycle
NaOH 100% each line kg/cycle
Quality of treated water:
• conductivity at 25°C (measured after cation
exchanger) pS/cm <0.01
• total iron (Fe) mg/I <0.02
• total copper (Cu) mg/I <0.003
• silica (SiO2) mg/I <0.02
• sodium ((Na) mg/I <0.01
BPDB, Barapukuria Power Plant 250 MW Bidder/ Contractor
Section B0: General Specification Time Schedule
Days after effective Date
Date Anticipated time schedule
• Time from Award of Contract to FOB (main components)
• Time required for transportation
• Time required for erection and commissioning
• Provisional Taking Over
B0/FZ-1
X
0.6.16.4.4 Personnel qualification 0.6. 16.4.5 Welding process
0.6.16.4.6 Pre-heating and heat treatment 0.6. 16.4.7 Documentation
0.6.16.5 Valves, steam traps, condensate drainers, safety
valves, control valves
0.6.16.6 Insulation0.6.16.7
0.6.17.6 Protection class for electrical operational equipment
0.6.18.6.10 Vibration measurements.
0.6.18.6.11 Control valves 0.6.18.6. 12 Actuators
0.6.18.6.13. Local instrumentation 0.6.18.7 Racks, junction boxes 0.6.18.8 Transmitter racks and piping 0.6.18.9 Programmable logic controller 0.6.18.10 Control cubicles
0
.6 General Technical Requirements 0.6.1 General requirementsThe following directions, information and technical requirements for design, engineering, layout, erection, installation and testing shall be observed as far as they are applicable for all equipment to be delivered. The requirements stated in this Section of General Technical Requirements are valid for all sections of the specification, except only where additional and/or special requirements are specified.
Any changes on the design of any part, of the Plant, which may become necessary after signing of the Contract have to be submitted by the Contractor in writing to the Owner/Owner's representative for approval, being sufficiently substantiated and justified.
The Plant shall be brand new and clean, and designed, manufactured and arranged so that it will have a functional design and a pleasant appearance. All parts of the Plant shall be arranged in such a manner as to facilitate surveillance by the operator and to ease maintenance, operation and control.
The parts of the Plant shall be designed and arranged so that they can be easily inspected, cleaned, erected and dismantled without necessitating large scale dismantling of other parts of the plant. They shall be designed, I1lClnufactured and put into operation in accordance with the latest recognized rules of workmanship, modern engineering practice and with good standards of prudence applicable to the international electricity generation industry which would have been expected to accomplish the desired result at the lowest reasonable cost consistent with reliability, safety and expedition.
The regulations, standards and guidelines listed in the Specification as well as all applicable laws and governmental decrees, regulations, orders, etc. shall be observed in the design, calculation, manufacture, erection, installation, testing, commissioning and start-up of all parts of the Plant.
The following shall be considered in the design and engineering of the Plant facilities:
• All parts of the Plant shall be suitable in every respect for continuous operation at maximum output as well as part loads and expected transient operating conditions peculiar to the site and shall be able to safely withstand the stresses arising from the operating conditions without any reduction in its planned life which shall be at least equal to 200,000 operating hours.
• The Contractor shall familiarize himself with the conditions on site and in the country, especially with respect to transportation of heavy loads and flood.
• Suitable and automatically acting protection and safety measures shall be provided for automatic load reduction or shut down of equipment in case of abnormal operating conditions.
• Switch over to stand-by units shall be automatically, as far as required for continuous Plant operation without interruption of Plant operation.
• In case of equipment and/or system shut down process conditioned drainage of
components (such as pipelines, tanks, etc.) shall be performed automatically or manually from the control room.
• Minor equipment which, in case of failure would cause
a
failure of a power generation unit and/or the Plant is to be provided with a stand-by facility in order to ensure further operation of the power generation unit or the Plant.• All live, moving and rotating parts shall be provided with appropriate effective protection in order to avoid danger to the operating staff. All metal parts shall be electrically grounded.
• All equipment shall be designed to ensure start-up from any condition, i.e. from cold, warm or hot condition without necessitating special or preparatory measures.
• Special attention shall be paid to interchangeability of plant components.
• The project language shall be English.
0.6.2 Standards and codes
The work must be performed according to the most recent relevant codes, standards, accident prevention regulations and legal regulations.
All materials and equipment supplied and all work carried out as well as calculation sheets, drawings, quality and Class of goods, methods of inspection, specific design features of equipment and parts and acceptances of partial plants shall comply in every respect with the following technical standards, codes and regulations .
• Statutory safety regulations for equipment items (e.g. for noise preventions).
• Accident prevention regulations of the Employer's liability insurance association, Regulations and rules of the Factory and Shop Inspectorate,
recommendations, directives and rules, Steel-Iron-Material Specifications, Material Specifications and Specification of Pressure Vessel Code.
• Internationally recognized standards may apply for standards and regulations.
The Contractor shall propose the international standard chosen by himself.
If this standard once is approved, the Contractor has to follow up. No standard mix will be all owed.
It is the Contractor's responsibility to provide sufficient evidence that any national or other standard the Contractor proposes will ensure a high standard.
Before starting his works, the Contractor shall deliver those standards in English language, which will be used on site to the Owner/Owner's representative and the Engineer.
0.6.3 Plant and equipment identification (e.g. Power Plant Coding System KKS)
The Contractor shall apply a plant identification system showing the name and number of each item of plant and its respective arrangement drawing number and add any additional items necessary to fully identify the plant. The identification and numbering of equipment, systems, items, etc. of supply, as well as of all documents and drawings shall be in accordance with the IDENTlFICA TION system (KraftwerksJiennzeichnungssystem = Power Plant Coding System PPCS) or equal. The IDENTIFICATION system is available from
VGB-Kraftwerkstechnik GmbH,
VerIag technisch-wissenschaftlicher Schriften Klinkestrasse 27 - 31,45136 Essen, Germany.
The Contractor shall work with this or any equivalent system that the works me going on smoothly.
There is to be only one description for anyone item of plant and this must be used consistently for plant, electrical and instrumentation designations throughout.
The Contractor shall supply all labels, nameplates, instruction and warning plates necessary for the identification and safe operation of the plant, and all inscriptions shall be in the English/Bangla languages.
All labels, nameplates, instruction and warning plates shall be securely fixed to items of plant and equipment with stainless steel rivets, plated self tapping screws or other approved means. The use of adhesives will not be permitted.
Nameplates for plant and equipment identification and record purposes shall be manufactured from stainless steel or aluminum with a mat or satin finish, and engraved with black lettering of a size which is legible from the working position.
Warning plates shall be manufactured from stainless steel or aluminum engraved red white lettering on a white background and sited in the position where they afford maximum safety of personnel.
All equipment within panels and desks shall be individually identified by satin or mat finish stainless steel or aluminum labels, or laminated plastic labels where approved.
Each circuit breaker panel, electrical control panel, relay panel, etc. shall have a circuit designation label on the front as well as on the rear panels engraved with black lettering in accordance with the circuit designation system. Circuit designations must be precise and convey complete information. There should be no doubt whatsoever for the operation as to which area of the plant a particular feeder is supplying with power. Labels such as interconnector 1, feeder 2 are not acceptable. Corridor type panels shall in addition have circuit designation labels within the panels.
Pipe work systems shall be identified with a color identification systems in conformity with the colors according to the chosen standards, with colors af the nameplates and, if necessary by color bands and with identification numbering and plain language. The direction of flow shall be shown.
Each valve shall be fitted with a stainless steel or aluminum name plate indicating the valve service and reference number in accordance with the IDENTIFICATION system.
Where possible valve nameplates shall be circular and fitted under the hand wheel captive nut. They have to be of such a diameter that there is no danger for persons operating the valve or that they do not prevent lock-off of this valve; on check valves and small valves the Contractor may provide rectangular nameplates fitted to brackets on the valve or attached to a wall or steelwork in a convenient position adjacent to the valve.
0.6.4 Marking and labeling of crates and packages
Each crate or package is to contain a packing list in a waterproof envelope. All items of material arc to be clearly marked for easy identification against the packing list.
All cases, packages, etc. are to be clearly marked on the outside to indicate the total weight, where the weight is bearing and the correct position of the slings and arc to bear all identification mark relating them to the appropriate shipping documents.
All stencil marks on the outside of cases are either to be made in waterproof material or protected by shellac or varnish to prevent obliteration in transit.
0.6.5 Corrosion protection, coating and galvanizing
This specification shall be used for the corrosion protection of steel structures, components, pipings and equipment in general which are installed in confined areas (indoors) or outdoors.
Surface preparation, as well as protective coatings and coating systems are based on this specification in order to assure that structural parts of different suppliers will get a corrosion protection of similar and high quality .
Coating material shall only be supplied by manufacturers with international experience and their products can be obtained internationally.
Regarding maintenance work (storage), application and supervision of coating work, choice of coating suppliers should be minimized. At any rate, similar parts of structures/components (such as structural steel, containers, piping, etc.) shall only be coated with products of one individual manufacturer.
The manufacturer's materials and equipment used, the methods of application and the quality of work shall at nil times be subject to the inspection and approval of the Owner/Owner's representntive or his representative.
Codes and standards
Applicable standards are to be proposed for:
• indication of pipe-lines according to flowing material
• surface roughness
• tight blasting agents
•corrosion protection, hot dip batch galvanizing of single parts, requirements and testing
•corrosion protection of structural steel work through protective coatings and topcoats
•preparation of steel substrates before application of paints and associated products
•paints and varnishes - corrosion protection of steel structures by protective paint systems
• color card
•Swedish standard or equivalent for steel surface preparation steel structure painting council.