Section 6 — Rotating Equipment

Special Purpose Steam Turbines

IPE Engineering Practice IPE-EP-6-3-2

Document number: IPE-EP-6-3-2 · Section: 6 — Rotating Equipment

The following paragraph numbers refer to API 612, Fourth Edition, 1995, which is part of this Engineering Practice.

INTRODUCTION

requirements for special purpose steam turbines correspond to those of API Standard 612, Fourth Edition, June 1995, with the specific options, deletions, additions, or modifications sanctioned in this specification. The term "Purchaser" as used in the API Standard and this specification shall be interpreted to mean the Refining Company.

The paragraph numbers in this specification correspond to those used in API 612. Paragraph numbers may not be consecutive and all APl paragraphs not addressed herein shall be considered to be verbatim requirements of this specification.

Instructions contained in this specification such as (add) or (substitute) shall be interpreted as follows: If information is (added) to an existing paragraph in the API Standard, the requirements of this specification shall be read as a continuation of the API paragraph. If information is (substituted), the API requirement shall be replaced in its entirety by the requirements of this specification. API paragraphs which are (revised) have specific revisions noted in this specification. If (New) is next to a paragraph number not appearing in API 612, it shall be read as an added requirement.

The Purchaser's requirements for all paragraphs in API 612 which require a Purchaser's decision (bulleted paragraphs) are indicated on the data sheets or in this specification. If not addressed in the inquiry, the proposal shall clearly state the basis included in the pricing furnished.

Table 1 records the vendor drawing and data requirements.

Note: U.S. customary units shall be regarded as standard. SI (metric) units in API 612 and this supplement are included for convenience reference only and shall not be interpreted as precise conversions.

GENERAL

• Scope

• (Substitute) This specification, together with the requisition, data sheets, and all attachments thereto, covers the minimum requirements for special purpose steam turbines. Any deviation from this standard must be approved by the Purchaser in accordance with the procedures specified in EP 1-1-3.

• A revision bar indicates all changes made to this Revision.

• Alternative Designs

(Add) Metric fasteners and flanges constitute alternative design features and must be cited as exceptions in the proposal.

• Conflicting Requirements

• (Substitute) In case of conflict between the various documents, their order of precedence is generally as follows:

Purchase Order Requisition Data Sheets

Project Specification(s) Referenced Industry Standards

• (New) All conflicting requirements shall be referred to the Purchaser in writing prior to issuance of the Purchase Order. The Purchaser will issue confirming documentation if needed for clarification.

• (New) Mandatory requirements cannot be superseded by any of the foregoing, and compliance therewith will be the joint responsibility of Purchaser and Vendor. Mandatory requirements include all codes, regulations, ordinances, and statutes of all municipal, provincial, state, and national bodies having jurisdiction in the location where the equipment is to be installed. It shall be the vendor's responsibility for discernment and compliance with those mandatory requirements.

• Referenced Publications

• (Substitute) This paragraph of API 612 does not apply to this specification (see 1.3.3 above).

• (New) The referenced specifications, and any others attached to the requisition shall apply to the extent referenced herein or on the data sheets.

STANDARDS AND PUBLICATIONS

BASIC DESIGN

• General

2.1.3e  (Add) If this point is not specified on the data sheets by the Purchaser, the driven equipment vendor will provide this data to the turbine vendor.

2.1.3.i (New) A future upgrade to 110% of the rated power at the rated speed with minimum inlet and maximum exhaust steam conditions shall be achievable, when furnished with suitable (larger or additional) nozzles and possibly with larger governor control valve. EXHAUST CASING SHALL NOT LIMIT STEAM FLOW AT NORMAL EXHAUST PRESSURE WITHIN THIS RANGE (TO MINIMUM INLET STEAM CONDITIONS AND 110% OF RATED HORSEPOWER).

• (Add)

a.The maximum allowable noise level for each noise source shall be 85 dBA as measured three (3) feet away from the major surfaces of the unit at the point of maximum A-weighted sound level and at five (5) feet above floor level.

b.Where equipment cannot meet the specified limits without the addition of a sound attenuating enclosure, the vendor shall state in the proposal the estimated levels with and without the enclosure and the basis for the estimated values.

c.If noise attenuating enclosures are required, the vendor shall furnish an enclosure approved by the purchaser. The equipment shall be enclosed with instrument and piping connections on the outside of the enclosures. The enclosures shall have adequate provisions for servicing the equipment and ventilation.

• (Substitute for the last 8 words) ...regulations as covered in paragraph 1.3.3.

• (Substitute)

All equipment and auxiliaries covered by this specification shall be designed for outdoor, unsheltered installation and operation. The weather and environmental conditions are given in the data sheets. The vendor shall list in his proposal any required or recommended protective measures.

2.2.5 (Add) All metal to metal pressure joints shall be flat and free of surface defects such as dents, scratches, marring, corrosion, or burrs. Face damage acceptance criteria is provided in Table 2.

2.2.9 (Add) Individual drain pipes shall be provided in each casing.

• (New) Turbines shall be provided with machined flats located as near as possible to the horizontal split line suitable for optical alignment of the train or for the installation of tooling balls. The vendor shall supply and install the tooling balls on the casing/ bearing housing and

mounting plate. Adequate clearance shall be provided to allow use of the tooling ball micrometer.

• (New) When required by the operating conditions, turbines shall be designed to automatically remove excess moisture condensed in the turbine. The Manufacturer shall include details of the design in the proposal. Information required shall include number of rows with protective coating, method of moisture removal, and quantity of moisture in the exhaust steam.

• Casing Appurtenances

2.3.2 (Add) A sentinel warning valve for temperatures greater than 350oF shall be supplied on all casings. Use steel valves of bronze material for temperatures to 350oF.

• Casing Connections

2.4.1 (Revision) Inlet and outlet connections shall be flanged.

2.4.5 (Add) Plugs shall not be seal welded.

2.4.6.4 (Substitute last sentence) The mating parts or a drilling template as specified on the data sheets shall be furnished by the vendor.

• (New) Unless otherwise specified, all process and lube oil connections shall be located on the lower half of the casing. The location of auxiliary piping, as well as conduit, tubing, etc., shall not interfere with the removal of the casing's upper half.

• (New) All casings shall include provisions for valved drains. Those larger than 1-1/2 inches nominal diameter shall be flanged. Drains shall not be manifolded (The Purchaser will individually pipe them to open drains). Hattersley Heath Class 800 Carbon Steel Gate Valves shall be installed in all steam drain and block valves. These valves have bellows seals on the shafts which prevent steam leaks.

• Rotating Elements

• Rotors

• Shafts

2.6.3.1 (Add) This data is required in proposal. See paragraph 5.2.4.

2.7 Shaft Seals

2.7.5 (Substitute) A separate gland vacuum sealing system shall be furnished in accordance with paragraph 3.5.1 and the sketch shown in Appendix B, API 612. The data sheet(s) will indicate if the vacuum device(s) shall be mounted and connected or shipped loose.

• Dynamics

• Lateral Analysis

• (Substitute) A train lateral analysis, considering the effects of other equipment in the train on the damped unbalance response analysis, shall be quoted as an option by the vendor assigned unit engineering coordination responsibility in the inquiry.

• d (Add) Where the test weight results in predicted amplitudes significantly below the vendor's recommended alarm levels at the vibration probe locations at maximum continuous speed, this fact shall be highlighted in the report for mutual agreement on resolution of the actual verification test weight and location (see 2.8.3.1) before the test.

2.8.2.4f (New) A plot of an unbalance sufficient to cause vibration amplitude of the recommended vendor alarm (alert) level at the probe locations at rated speed showing the amplitude(s) at the seal locations along the shaft when the machine is operated through any resonance, including coast down from trip speed. In placing this weight, consideration shall be given to the location(s) most likely to experience imbalance during normal operation (blade deposits in transition zone, etc.).

2.8.2.6  (Add) Deflections at floating ring seal(s) shall be as mutually agreed.

• Shop Verification of Unbalanced Response Analysis

• (Substitute) The verification test described above, and/or a phase or amplitude indication in the damped unbalanced response analysis (based on the unbalance conditions described in 2.8.2.4, Item b above) shall meet the following criteria:

a.Any critical response shall be located outside the operating speed range and meet the separation margin requirements of paragraph 2.8.2.5. The major-axis amplitude of any response peak shall meet the limits specified in paragraph 2.8.2.6.

b.If these criteria are not met, the original damped unbalance response analysis shall be corrected, and additional testing shall be made per paragraph 2.8.3.4 below.

• (Insert the following opening sentence) For rotors failing to meet the criteria specified in 2.8.3.3, additional testing will be required as follows. Unbalance...

b.(Substitute) At no speed within the operating speed range shall the shaft deflections exceed the lesser of either 55 percent of the minimum design running clearances or 150 percent of the allowable vibration limit at the probes (see 2.8.2.4, Item b).

(Revise last two sentences to read) Acceptance will be based on these calculated displacements; however, damage to any portion of the machine as a result of the test shall constitute failure of the test. Observed internal seal rubs resulting in clearances beyond the vendor's new part tolerances constitute damage. Minor internal seal rubs within vendor specified new part tolerances are not cause for rejection.

2.8.4 Torsional Analysis

2.8.4.5 (Revise) For units including gears, the vendor assigned unit engineering coordination responsibility in the inquiry (order), shall perform a torsional vibration analysis of the complete coupled train and shall be responsible for directing the modifications necessary to meet the requirements of 2.8.4.1 through 2.8.4.4. For all other units, the cost of a train torsional analysis shall be included in the proposal for the Purchaser's review. In any event, the turbine vendor shall prepare and submit rotor data required to conduct torsional analysis.

2.8.5 Vibration and Balancing

2.8.5.2 (Add) The vendor shall include provisions to allow for field balancing without dismantling or removal of major turbine components. A minimum of three balancing planes, complete with balancing weights, shall be provided. The vendor shall advise the method of attaching balancing weights.

2.8.5.5 Vibration

(Substitute) During the shop test of the assembled turbine operating at its maximum continuous speed or at any other speed within the specified range of operating speeds, the double amplitude of vibration for each shaft in any plane measured on the shaft adjacent and relative to each radial bearing shall not exceed 1 mil plus up to 0.25 mils for combined mechanical and electrical runout for shaft speeds up to and including 12,000 RPM. For speeds in excess of 12,000 RPM the double amplitude of vibration shall not exceed

A   0.25 mils

(Combined Electrical and Mechanical Runout

Where:

A = amplitude of unfiltered vibration, in mils (micrometers) peak to peak.

N = Maximum continuous speed, in revolutions per minute.

At any speed greater than the maximum continuous speed, up to and including the trip speed of the driver, the vibration shall not exceed 150 percent of the maximum value recorded at the maximum continuous speed. Electrical and mechanical runout shall be determined and recorded by rolling the rotor in V blocks while measuring runout with a noncontacting vibration probe and a dial indicator at the same shaft location. If the vendor can demonstrate that electrical or mechanical runout is present, a maximum of 25 percent of the test level calculated from Equation 1 or 0.25 mil (6.4 micrometers), whichever is greater, may be vectorially subtracted from the vibration signal measured during the factory test.

2.8.5.7 (Add) The electrical and mechanical runout recorded at slow roll, 500 rpm, may be vectorially subtracted from the vibration signal measured during the factory test (see 2.6.2.2).

• Bearings and Bearing Housings

• Thrust Bearings and Collars

2.9.2.3 (Substitute) Dry type couplings are mandatory..

• Bearing Housings

• (Add) Bearing housings shall be furnished with vents/oil breathers to facilitate lube oil drainage. Vent/breathers shall extend at least 12 inches above the top of bearing housings.

• (Add) Bearing housings labyrinth shaft seals shall include provision for a 25 SCFH, low pressure nitrogen purge to prevent steam condensate from entering the bearing housings, particularly during periods of idleness. The entry point is to be the second or third labyrinth from the outside of the casing.

2.9.4 Grounding

(Add) Brushes shall be of the spring loaded wire brush design, capable of being replaced during operation. They shall touch the shaft at the point of lowest possible surface speed and shall allow shaft current measurement.

2.10 Lubrication and Control-Oil System

2.10.2 (Add) A pressurized lube oil system per EP 6-9-1, shall be provided when the turbine drives an electric generator.

2.10.5  (Add) The common system oil characteristics will be as stated unless otherwise shown on the data sheets by the vendor assigned unit engineering coordination responsibility. If this lubricant is not acceptable, the vendor shall clearly indicate so in his proposal with a clearly visible statement of requirements.

2.11 Materials

2.11.1 General

2.11.1.2 (Add) When the vendor's quoted material specification is DIN, JIS, or other foreign standard, the proposal shall indicate the nearest above named American specification equivalent ALONG WITH EXACT AND SPECIFIC DEVIATIONS, IF SUCH EXIST, for Purchaser's evaluation of equivalence for service intended.

2.11.2 Castings

2.11.2.2 (Add) Improperly fused chaplets in iron castings shall not be replaced with plugs.

2.11.2.3.1 (Add) Completed welding repairs shall conform to all requirements of the applicable ASTM casting specification, and to paragraph 2.11.3.5 (below).

2.11.3 Welding

2.11.3.1 (Add) Filler weld material shall be such that the analysis of the resultant deposited material shall not be less than the analysis of the lower base alloy material.

Gas tungsten arc welding (GTAW) shall be used for the root pass on all piping. Consumable inserts may be used but must be completely fused into the pipe. Back-up rings shall not be used. Ten percent random radiographic inspection is required on butt welded piping. All shall be visually inspected. Socket welds do not require radiographs.

2.11.3.3  (Add) The Purchaser's written approval shall be obtained before any major repairs are made to castings.

2.11.3.4.3 (Add) Corner joints shall confirm to paragraph UW-13 and UG-93(d)(3) of Section VIII, Division 1, of the ASME BPV Code.

2.11.3.5.1 (Add) Welded joints of pressure casings shall be 100% radiographed in accordance with paragraph 4.2.2.1.1 of API 612.

2.11.3.5.3 (Add) All welds in auxiliary piping, including seal welds and pipe-to-case welds, shall be heat treated, hardness tested, and examined in accordance with the table below.

Heat treatment and hardness testing shall conform to ANSI B31.3, paragraph 331.3. Examination shall conform to paragraph 336.4.

WELD HEAT TREATMENT AND EXAMINATION

3.0 ACCESSORIES

3.2 Mounting Plates

3.2.1.2.2 (Substitute) The equipment feet and mounting plates shall be equipped with vertical and horizontal jackscrews. Ample space for easy placement of a precision machinist's level, Starrett 98 or equal, shall be provided on all equipment foot pads/mounting plates in both directions.

• (Add) The turbine and driven equipment shall be mounted on a continuous, welded, structural steel baseplate furnished by the Manufacturer of the driven equipment, except as otherwise agreed upon.

• (Add) The targets (tooling balls) shall be provided with adequate clearance to allow for set up and use of a micrometer between them.

• (Substitute last sentence) The vendor shall provide sub-soleplates when required by his design or recommended installation practice.

• (Add) Baseplate decking shall be sloped and have rims to provide complete skid drainage to one or more 3/4 inch minimum tapped couplings.

• Gear Units

(Substitution) Gear units shall comply with EP 6-5-1. The gears shall be of the double helical type. Where turbine and gear are lubricated from a common system, turbine vendor shall ascertain that the oil is suitable for lubrication of both turbine and gear.

• Controls and Instrumentation

3.4.2 Overspeed Shutdown System

3.4.2.1 (Add) The speed governor shall be provided with a speed changer, manual override device and weatherproof kit. The governor type and NEMA class required are specified on the individual unit data sheets. In general, speed control will be accomplished by an actuator arranged to receive a remote 4 to 20 milliamp signal from the Purchaser's controller. Unless otherwise specified, minimum signal corresponds to minimum speed.

3.4.2.4.5 (Add) Trip and throttle valves shall be deisigned and oriented such that gland leakage will not result in operator contact with the leak while the operator is either turning the handwheel or handling the exerciser controls

• Instrument Panel

•  (Add) Unless otherwise specified on the data sheets, a free standing turbine gauge panel is required for mechanical drive units, and will normally include the following:

• Steam ring pressure on single-valve turbines only.

• All wheel space pressures so as to determine turbine fouling.

• Extraction pressure on extraction turbines only.

• Pressure in next stage after extraction section on extraction turbines only.

• Seal steam pressure.

• Lube oil pressure.

• Control oil pressure

• Digital tachometer.

Mounting of panel mounted instruments shall facilitate easy replacement. The gauge board shall be clearly visible and readable by an operator at the trip and throttle valve, and shall preferably be located on the equipment baseplate.

3.4.5.1 (Add) An electronic digital tachometer shall be provided by and mounted on the gauge board by the manufacturer. It shall be complete with three pickups and amplifier-computer capable of dual readouts. The tachometer shall also serve as a secondary overspeed trip device requiring two (2) sensors of three (3) agreeing on an overspeed condition in order to shut the turbine down. The tachometer shall incorporate no mechanical connection between the moving and stationary parts and shall not depend on the maintenance of precise clearance between moving and stationary parts for accuracy.

3.4.5.2.1 (Add) Dial Thermometers shall have stainless steel cases.

3.4.5.3 (Add) Thermowells shall be of drilled bar stock material with 1 inch male NPT threads.

3.4.5.5 (Add) Pressure gauges shall have cast aluminum cases. Pressure gauges shall be provided with 3/4 inch block valves. In addition, an equalizing line and valve shall be provided for differential pressure gauges.

• (Add) A pressure relief valve with a flow capacity equal to or greater than the rated flow of a back pressure turbine will be installed in the discharge line by the Purchaser in accordance with EP 5-6-2.

• Flow Indicators

(New) Flow indicators, with the flapper removed, shall be of the drip-lip, armored type in all oil return lines.

• (Substitute) Electrical alarm and trip circuits shall be normally energized (closed) and shall de- energize (open) to alarm and/or trip. Separate switches shall be used for alarm and shutdown functions.

• (Add) Bypasses on alarm and trip circuits, if provided, shall have spring loaded, keylock devices or other means to absolutely prevent inadvertent operation with safety device bypasses, ensuring that when the bypass switch is released, the unit returns to the fully protected mode.

• (Add) Test connection size shall be 1 inch.

3.4.7.3 (Revision) Replace "neoprene" with 'fluorocarbon".

3.4.8 Vibration, Position, and Bearing Temperature Detectors

3.4.8.1 (Add) All probes shall be removable and adjustable while the machine is operating. Probes shall be located above the horizontal centerline. Removal of the probe shall not result in oil loss.

3.4.8.3  (Add) Bearing temperature sensors shall be 3-wire platinum RTDs specified and installed per API 670, paragraph 3.2.1.1, unless otherwise indicated on the Data Sheets.

3.4.8.5 (New) RTD or thermocouple conduits shall be properly sealed to prevent lube oil from migrating to the junction boxes. All junction boxes will be located above bearing housings, if possible.

• Identification of Terminals (New Section)

• All shop-mounted electrical devices, junction boxes, and pipe terminations which require field connection to the Purchaser's instrumentation shall be shop-tagged with the Purchaser's item numbers. Numbers shall be stamped in characters approximately 3/16 inches (5 mm) high, preferably on the Manufacturer's nameplate, or on a tag of corrosion-resistant metal permanently attached to the terminal.

• On source outlet connections, tags shall be secured to valve yokes.

• For electrical systems, tags shall be affixed to the outside of junction boxes, where used, or directly to those devices having terminals which are not shop-connected. Terminal-strip stations shall be numbered sequentially.

• The turbine vendor shall provide schematic diagram(s) showing all required connection points. Item numbers not previously assigned will be marked in by the Purchaser on the review issue of these diagrams.

• Gland Vacuum System

3.5.1 (Add) The gland condenser shall have naval brass tube sheets.

3.5.3 (New) A Y-type strainer with Monel mesh screen having an effective area twice that of the ejector steam line shall be provided for the steam supply system for the ejector.

• Piping and Appurtenances

• General

(Add) Auxiliary system pressure ratings shall be high enough to withstand adjacent part hydrotest pressures.

•  (Add) Cast iron components in the piping system are not allowed without specific approval by the Purchaser.

• f (New) Piping adjacent to insulated equipment shall be arranged to avoid interference with insulation. Pipes shall be connected to allow servicing of the major equipment to minimize the need for breaking connections.

• (Add) In such, pipe shall be joined by welding or flanging. In general, 2 inch NPS and smaller socket weld fittings shall be used while connections 3 inch NPS and larger shall be flanged and buttwelded. Where flanges are required in a stainless steel piping system, only weld neck flanges shall be used. In such systems, control valve bodies and block valve bodies may be carbon steel.

3.6.1.11 (Substitute) All tubing shall be of Type 316, seamless, annealed, stainless steel. All tubing fittings shall be of Type 316 stainless steel by Crawford Swagelok. All instrument root valves shall be of 3/4 inch minimum size. Tubing 1/2 inch OD NPS (.065 minimum wall) shall be used between the root valve and the instrument.

Instrument valves for oil and gas service in protected areas, such as panels and gauge boards, may be 1/2 inch NPT, provided that the block valve provided in the sensing line upstream of the instrument valve is a union bonnet type (not a threaded-in bonnet type).

• Oil Piping

• (Substitute) Oil supply piping, tubing and fittings shall be of seamless, stainless steel in accordance with ASTM A-312. Schedule 40 minimum shall be used for sizes 2 inches or smaller, and Schedule 10 minimum shall be used for sizes larger than 2 inches.

Where space does not permit the use of pipe, seamless tubing A269 3/4 inch and 1 inch size may be furnished and shall have stainless steel fittings as described above. The minimum wall thickness shall be 0.095 inch and 0.0109 inches, respectively.

Lube oil stub-out piping from bolted-on steel bearing housings may be carbon steel. When used, such a stub-out shall terminate with a flange. The length of the stub-out shall be minimized but shall not exceed 12 inches.

• (New) Oil sample stations shall be provided by the vendor at the outlet of each bearing.

• (New) Vendor shall provide for bypassing the bearings during shop and field pre-startup oil flushing operations without disassembling bearing housings. The external feed/drain lines on the housing(s) shall be designed with a blinded T next to the housing (or a short removable flanged section) so that a temporary bypass can be easily installed to the drain line(s) and the housing blinded or plugged. The temporary bypass lines shall be shipped with location identification tags as one of the "Special Tools" for Purchaser's use in field startup.

• Insulation and Jacketing

• (Substitute) Insulation blankets shall be provided. Blankets shall be oil resistant, be covered with a stainless steel wire mesh, allow an external skin temperature of no more than 120oF and have a stainless steel foil liner against the turbine case. The number of pieces shall be

kept to a minimum and each piece shall be labeled to aid field installation. A drawing of blanket placement shall be included in the instruction manual.

• (Delete)

3.9 Turning Gear

INSPECTION, TESTING, AND PREPARATION FOR SHIPMENT

• General

4.1.4.4 (New) Non-witnessed means that the vendor is not obligated to give formal notice of an impending test. The Purchaser or his representative however, shall not be barred from being in attendance at a non-witnessed test.

• Inspection

• General

• Material Inspection

4.2.2.1 (Add) Castings which will be exposed to pressures exceeding 1250 psig (86 bar) (8600 kPa) or temperatures above 900oF (482 °C) shall be examined in accordance with Appendix 7, Section VIII, Division 1, of the ASME BPV Code.

4.2.2.4.2 (Add) All surfaces of steel castings, including machined faces, shall be magnetic-particle examined.

(Add) Steel castings shall be examined visually in accordance with applicable ASTM specifications. MSS SP-55 shall be used to define acceptable surface discontinuities and finish.

• Mechanical Inspection

• (Revise) Delete words "When specified".

• (Add) The Purchaser retains the option of making a cleanliness inspection.

• Testing

4.3.2 Hydrostatic Test

4.3.2.6 (Add) Use of any type of gaskets on axial split joints, including string or tape, is prohibited during hydrostatic testing.

4.3.3 Mechanical Running Test

4.3.3.1.3 (Add) Prior to the test startup, the shop lube system, unit bearing housings, and all interconnecting piping shall be thoroughly flushed and cleaned.

4.3.3.1.5 (Add) Shutdown controls and the sealing system shall be shop tested for proper functioning.

4.3.3.2.8 (New) Readings shall be logged every 20 minutes, as a minimum, during the 4 hour run at maximum continuous speed.

4.3.3.3.3 (Add) The measurement shall be recorded on deceleration (coast down) with the slow-roll (300-600 rpm) total runout (electrical and mechanical) subtracted by vectorial runout compensation. These recorded shaft-relative data shall include speed, peak-to-peak displacement, and phase (see 4.3.3.1.8).

4.3.3.3.5 (Add) Vendor shall make tapes starting with initial shop run, even if not witnessed or observed.

4.3.4.4 (Revision) Delete.

4.4 Preparation For Shipment

4.4.1 (Add) The Seller shall submit packaging and preservation procedures to the Purchaser for review with the proposal.

4.4.3.10 (Revision) Replace " lead" with "polypropylene".

5.0 VENDOR'S DATA

5.2 Proposals

(Add) In addition to all of the other information required, the proposal of the vendor shall include an installation list showing the model designation, rated power, speed, steam conditions, current owner, location, and date of start up of similar machines. A chronology of the design, development, and testing and summary of operating history of the specific blading proposed shall also be included.

This list should contain descriptions of at least two turbines, similar to the unit offered in the proposal, manufactured at the same facility and in operation for at least two years. Other proposal requirements include:

5.2.3.k (Add) Also include requirements of paragraphs "General," 2.6.1.3, 2.7.1, 2.8.2.3, 2.8.2.4c, 2.8.3.4, 2.8.4.5, 2.8.5.5, 2.10.5, 2.11.1.10, 2.11.1.15, 2.11.2, 3.2.2.5, and 3.4.3.10.

• (New) A data table of the BHP output, speed, steam rate, inlet and discharge pressure and temperature and efficiency of the turbine at the rated and normal operating points.

• (New) The lower limit on the turbine exhaust pressure. Vendor shall include the temperature and enthalpy of the exhaust steam when running at low efficiency during off-design conditions.

• Curves

• (New) The vendor shall supply steam correction curves for off-design steam conditions, such as start-up.

• (New) Campbell, Goodman and Soderberg diagrams as well as blade root configuration drawings are required for each stage prior to issuance of the Purchase Order.

• (New) Provide a throttling curve showing steam flow versus horsepower indicating the position of governor valve openings. It is preferred that the majority of steam flow through the first opening governor valve.

• Contract Data

• General

• (Add) Certification shall be indicated on certified data as follows: "Certified Correct for P.O."

Signature Date

• (New) The vendor shall provide full information to enable the Purchaser to properly install, start, operate and maintain the equipment. This shall be done by submitting data and drawings as specified in paragraph 5.2.3. It is the intent of the Purchaser to review this data and return data/drawings to allow the vendor to add/refine data as required for this purpose. Corrections or changes that constitute a change in the "as Purchased" design, or deviations from the applicable specifications must have prior written approval from the Purchaser in the form of a corrected Purchaser Order and Requisition.

• Drawings

(Add) Maximum allowable suction and discharge flange forces and moments shall be listed on the drawings in tabular form.

(New) Revision boxes shall be provided to describe revisions in detail. Indication of revisions shall be made on the drawings by means of a circled revision number near the area revised. Manufacturing shall proceed without drawing approval.

• Technical Data

• (New) Material certifications shall be provided to the Purchaser for turbine rotors, buckets, shrouds and major casing components.

• (New) Certified copies of test data, including hydrostatic tests, are required before shipment.

• (New) Calculated rotor response reports shall be submitted.

5.3.6 Installation, Operation, Maintenance, and Technical Data Manuals

5.3.6.1 (Add) One complete set of installation, operation and maintenance instructions shall be packed in the boxes or crates with the equipment.

• GUARANTEE AND WARRANTY (New Section)

• General

(New) Unless exception is recorded by the vendor in his proposal, and agreed by amended specification, it shall be understood that the vendor agrees to the warranty and guarantee stipulated in purchase documents and paragraph 6.2 of this specification.

• Performance Guarantee

(New) The turbine shall be guaranteed for satisfactory mechanical performance at all operating conditions specified on the data sheet and the operating range between those points. The thermodynamic performance guarantee point shall be the normal operating point or other points indicated "guarantee" on the data sheets with no negative tolerance allowed on steam flow (see paragraph 2.1.3).

Appendix E

Item 41.h, pg. 71 (New)

Bare shaft radial runouts, assembled rotor shaft radial and disc radial and axial runouts (T.I.R.).

7.0 TABLES

TABLE 1 DOCUMENTATION REQUIREMENTS

FOR SPECIAL PURPOSE STEAM TURBINES PER EP 6-3-2

TABLE 1 (CONT.) DOCUMENTATION REQUIREMENTS

FOR SPECIAL PURPOSE STEAM TURBINES PER EP 6-3-2

NOTE:

(1) If the document cannot be provided in the format as indicated, the Manufacturer shall consult with the Owner's Engineer for an acceptable alternative.

TABLE 2

FACE DAMAGE ACCEPTANCE CRITERIA

NOTE:

(1) For ring joint and spiral wound (tongue and groove joint) gasket types, resurfacing shall be required if more than 3-5 permissible defects are found. Seating surface is taken as center 50% of groove face.

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