chap5-technical specification.doc

INDOGULF CORPORATIONBIRLA COPPER EXPANSION : PHASE - II

05.00 GENERAL TECHNICAL SPECIFICATION OF THE EQUIPMENT

05.01 Design Criteria

All equipment shall be designed to operate on the following condition.

a) Installation = Indoorb) Altitude = SEE Chapter 09c) Ambient temperature = “d) Relative humidity = “e) Cooling water temperature = “

Both maximum temperature and max relative humidity do not occur simultaneously.

Equipment performance guarantee shall be offered to the above site conditions.

The design of the equipment shall be suitable for continuous heavy duty service of 8760 hours per year.

Special consideration shall be given to the sea-shore atmospheric corrosion and seismic condition of the site.

05.02 GENERAL TECHNICAL SPECIFICATION OF EQUIPMENT

5.2.1 Centrifugal Fans Duty Specification of fans shall be as per table – 1

5.2.1.1 The centrifugal fans shall include, but not be limited to the following:

- The split fan housing with side walls and scroll plate, all necessary flanges, reinforcing sections and access door.

- Inlet cone.- The support of welded type for bearings, motor & fan.- Welded type impeller.- Shaft with guard.- The bearing unit with housing and bearings.- Electric motor.- Flexible coupling & coupling guard.- Shaft sealing.- Vibration monitoring system with sensors & transmitter.- Vibration isolators.

TS.No.MEC/Q144/01/08/S520 Rev-0 Ch V - of 6


- Surface treatments.5.2.1.2 All centrifugal fans shall be sized for the duty as specified in the duty

specification sheet 17.01 of this specification.

5.2.1.3 The fan is to work at an ambient temperature of 50°C during summer and +10°C during winter unless otherwise specified in the duty specification sheet 17.01

5.2.1.4 The specifications for fan have been indicated for normal temperature & pressure unless otherwise stated.

5.2.1.5 The medium handled by fan shall be as specified in the duty specification data sheet

5.2.1.6 All centrifugal fans shall conform to IS:4894:1987.

5.2.1.7 The fan shall be of rugged steel construction with proper painting and suitable for heavy duty operations. The dimensioning & construction of the fans shall be strong enough to withstand acceleration and deceleration at full rated power.

5.2.1.8 The discharge position, rotation shall be as per the duty specification data sheet. Rotation of the fan has been indicated as seen from the drive end. However, the discharge position and rotation are tentative only.

5.2.1.9 Fan outlet velocity shall preferably be in the range of 12-14 m/sec.

5.2.1.10 Fan and motor assembly shall be accommodated within the space indicated in the drawings.

5.2.1.11 The fan shall be provided with variable frequency drive for capacity control as specified in the duty specification.

5.2.1.12 Fan outlet shall be fitted with canvas connection or expansion bellow to isolate the vibrations.

5.2.1.13 The performance curves for the fans shall be so chosen that the fan performances are stable at the surge limit.

5.2.1.14 For variable volume operations, a family of performance curves for inlet vane settings through the range of air volumes specified in the data sheets shall be furnished.



5.2.1.15 The fan design shall be such as to minimise dust build-up.

5.2.1.16 The equipment noise shall not exceed 80 dBA at 1m distance.

5.2.1.17 Fan housing

a) The material of fan housing shall be as specified in the duty specification. The housing shall be provided with lifting lugs, drain plug and access doors for inspection and easy maintenance. The housing shall be rigidly braced with structural steel sections.

b) Where components of the fan housing are bolted together, the match line in the casing interior face shall be machined and properly matched. Bolt holes shall not penetrate the casing interior.

c) The housing shall be of flanged construction with removable sections to permit easy replacement of intermediate parts of equipment without excessive disconnecting of structures in connection with the fan.

d) Housing inlet and outlet shall be flanged and drilled for attachment to ductwork.

5.2.1.18 ROTATING PARTS

a) The fan shafts shall be suitable for specified service, and designed so that the first critical speed is not less than 33.3% over the maximum speed at which the fan will operate.

b) Shafts shall be provided with standard key ways for flexible couplings.

c) All moving parts shall be arranged so as to be readily accessible for inspection, maintenance & repairs. Approximate maintenance clearances shall be shown on proposal drawings.

d) The shaft and coupling assemblies shall be dynamically balanced at factory before shipment.

e) The fan-wheel assembly (a complete unit, ready for operation) shall be dynamically balanced at factory before shipment.

f) Safety guards shall be supplied for moving parts accessible to operating personnel.

5.2.1.19 Lubrication

a) All moving parts shall be provided with sufficient lubrication at the time of startup.



b) The parts that require periodic lubrication shall be provided with lubrication nipples that shall be easily accessible.

c) The fan bearings shall be provided with grease lubrication or with an oil sump lubrication maintained by a constant level oiler. An oil level indicator shall be provided.

d) A lubrication chart showing lubrication points and requirements shall be provided.

5.2.1.20 SEALING

a) The shaft sealing type shall be described by the tenderer.b) Sealing types for openings, inspection doors and lead-throughs of

the fan housing shall be provided with self-aligning gasket and quick release latches.

c) Sealing between the shaft and casing can be a labrynth or gasket type.

5.2.1.21 BEARINGS

a) Bearings shall be of manufacturer's standard design for service conditions specified herein.

b) Bearings shall be provided with adequate cooling as required for proper operation.

c) For the basic rating life (L10) calculations for roller bearings according to ISO:281:1990, a required basis shall be at the minimum 60000 hours.

5.2.1.22 MOTORS AND ELECTRICALS

a) The drive components shall be selected based on the maximum continuous effect required.

b) The fans shall be equipped with a squirrel cage electric motor, a coupling & guard, a shaft with bearings, all mounted on a common base plate.

c) All motors and other electrical equipment necessary for operation and control of the fans shall be supplied. The electrification shall be according to Chapter no.07.00 (ELECTRICS) of this specification.

d) All electrical motors shall be completely specified in the motor data sheets. Wherever possible, standard motors shall be used.

e) Motors controlled by variable frequency converter shall be furnished with a separate cooling fan if required.



f) The windings of the electric motors shall be furnished with RTD sensors for temperature monitoring.

5.2.1.23 INSTRUMENTATION

a) All controls and Instrumentation equipment necessary for operation and control shall be supplied. The Instrumentation for the fans shall be according to Chapter no. 08.00 of this specification.

b) Fan shaft bearings shall be provided with vibration sensors and transmitter. The output of the transmitter shall be a 4 - 20 mA standard instrument signal.

c) The bearings of the fans shall be provided with RTDs including 4 - 20 mA transmitters.

d) Inlet guide vanes for the control of fan capacities shall be provided with a pneumatic actuator and electro-pneumatic positioner. The operation of actuator shall be such that in case of pressure failure, the actuator is open. Provision shall be made for hand-operation also.

e) The tenderer has a right to propose instruments in addition to those mentioned in this specification if he finds it necessary. These instruments shall be included in the delivery, and the tenderer shall show all the instrumentation equipment provided on the P&I diagram, and specify them in detail.

f) All instrumentations for remote control delivered by the tenderer shall be connected to a Distributed Control System (DCS) for indication, alarm or trip purpose. The DCS is not in the scope of the tenderer.

SPECIAL NOTE:

Tenderer to note that in the Drg. No. IND131-15-002 (R2) enclosed, the stack location and scrubber system location (within which 07-FA-01 will be accommodated) is marked. Fan 07-FA-01 pressure shall be designed to deliver the scrubber gases till this stack outlet.


chap5-technical specification.doc

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