State Plan -Supply, Erecting and Commissioning of 200 HP slow speed non clog flood proof submersible pump set and allied works at Kuriathy Pump House - Sewerage Work.

Amount

Supply, Erecting and Commissioning of Pump Set

Supply, Erection, Commissioning and trial run of non-clog dry well installed sewage raw water submersible pumpset with Monoblock motor having a total Head range of 19 to 23m and discharge of 1500m3/hr at 23m head with a combined efficiency of 80%; slow speed 960 to 1000 rpm with all accessories at pump house of the following specifications: Pump:- Non-clog dry well installed submersible pump with 20m cable with the following specifications and materials of construction for pumping sewage of specific gravity 1.05 with monoblock motor construction and soft starter panel speed (N)-960 to 1000 rpm, combined efficiency not less than 80 %,

Casing and impeller:- The impeller (s) shall be of semi open multi vane, back-swept, non-clog design. The impeller vanes shall be self-cleaned upon each rotation and shall keep the vane clear of debris, maintaining an unobstructed pumping. The impeller(s) shall have heavily back swept leading edges with a specific angle distribution enabling the capability of handling solids, fibrous materials, heavy sludge and other matter found in waste water. The design of the impeller shall prevent builds up at the leading edge. Impellers shall be locked to the shaft and be easy to fasten and to remove. The clearance between the pump housing/insert ring and the impeller shall be adjustable. The leading edges shall be induction hardened to a depth of 4-5mm. The hardness shall have a minimum of 45 HRC. The impeller to be made of SS material and pump housing shall be of grey iron EN 1561-GJL-250 or ASTM-A48- No. 35 B. Pump volutes shall be single-piece non-concentric design with smooth passages large enough to pass any solids that may enter the impeller. The volute shall have a mating flange machined and be prepared for a flush valve.

Motor :- Suitable capacity class H squirrel cage lowed in air filled water tight chamber induction motor voltage 415 /-10%, power supply 50 Hz /-3% motor cooling by handled liquid equivalent mechanical seal combination including all suitable accessories such as suction pipe, delivery pipe, expanders/reducers to existing pipes, sluice valves - 2Nos., NRV - 1No., bends, connection to the existing header as required with fittings, required flange joints, mechanical joints, nuts bolts, gaskets etc. Pump and motor shaft shall be the same unit. The pump shaft is an extension of the motor shaft. Couplings shall not be acceptable. The shaft material shall be AISI type 431 stainless steel. The use of stainless steel sleeves will not be considered equal to stainless steel shafts. The outer design shall be maintenance optimized. The pumps shall be easy to clean when serviced. Each pump shall be provided with plug-in seal unit consisting of two independent working mechanical face seals and a propeller that also circulates the coolant in the cooling system. The springs shall be positioned so they always are protected from the pump media. The seals shall operate in conjunction with a liquid reservoir that continuously lubricates and cools the seal faces. Both seals shall comprise one stationary and one mechanical driven rotating ring. Each seal interface shall be held in contact by its own spring system. The seals shall not depend on direction of rotating for sealing. The seal cavity for the outer seal shall be equipped with means for wear reduction such as spiral grooves for particle removal.

The support bearing shall consist of a double row angular contact ball bearing.<br>The motor shall be designed for continuous duly handling pumped media of 40 Degree Celsius and capable of up to 15 evenly spaced starts per hour. Thermal switches set to open at 140 Degree Celsius and close at a minimum of 70 Degree Celsius, shall be embedded in the stator lead coils to monitor the temperature of each phase winding. These thermal switches shall be used in conjunction with and supplemental to external motor overload protection and shall be connected to the control panel. The motor and pump shall be designed and assembled by the same manufacturer. The motor shall be designed for operation up to 40 Degree Celsius ambient temp with a temperature rise not to exceed 80 Degree Celsius. A motor performance chart shall be provided showing curves for torque, current, power factor, input/output KW and efficiency. This chart shall be also includes data on starting and no-load characteristics. The motor and the cable shall be capable of continuous submergence under water without loss of water tight integrity according to protection class IP 68 (20m). The rated power shall be adequate so that the pump is not over-loading throughout the entire indicated pump performance curve.

CABLING- Supply, laying, testing and commissioning of suitable size XLPE cables for the above pump set from panel board to starter and from starter to motor. Considering energy conservation. EARTHING:- Supply of all material and providing suitable earthling by using suitable slze plpe/plate earthling GI/copper strip buried in ground and giving double earthling to motor, starter, panel board etc. As per IE standards CAPACITOR:- Supply, erection, testing and commissioning of heaw duty APP capacitor for the motor to get a power factor above 0.95.The capacitor shall confirm to IS 2834 The rates include for supply, erection, commissioning and maintenance for two years of different duty conditions and minimum of two years warranty.

ADROIT ENGINEERING WORKS

NATHIPATHI ENGINEERS

Bidder Name

NATHIPATHI ENGINEERS

VIJAYAN ENTERPRISES

ADROIT ENGINEERING WORKS