REPAIR/PREVENTIVE MAINTENANCE OF EARTHING INFRASTRUCTURE AT AF STN BKT

Amount

Comprehensive Annual Maintenance contract for earthing result testing and enhancement of earthing quality of existing earthing for any type of Earthing such as GI plate / Cu plate / Chemical/ Bore Earthing connected with HT panel, LT panel, Equipments, Lightening arresters, DG sets, Transformers etc(total no of earthing -1230 Nos) and For married Accn (total no. of earthing 90 Nos) in any position and any place at AF Stn BKT including indaurabagh using Digital Earth meter in 3M method and E-N voltage at main DBs and register the result as per proforma provided in Earth Test Ragister dully signed by User. In Case of satisfactory results not found or earth resistance is not within permissible limit or erthing quality degraded the maintanance/enhancement of earthing quality of existing earthing complete will be done with necessary excavation and earth work, complete for chemical treatment of existing earth electrode with Benzonite Powder solution (2x25Kg in each bag) sourounding the earth plate to get the earth resistance within permissible limit as directed by EIC, including pouring of salt water as required, minor repairs for jointing/ welding as required including water up to top of the excavated bore, backfilling of earth pit, measuring the value after refilling pit and testing of earthing after recharging, reconnecting grounding electrode conductor and earth grid applying petroleum jelly etc. to bolted joints to minimise corrosion for the pipe earthing or plate earthing to lower down the resistance complete all as specified and as directed by Engr-in-charge. Note-(i) Necessary compound and materials required for recharging shall be measured and paid separately under items . (ii) Total no. of earthing to be checked in a month 120 Nos. (iii) Contractor must visit the site before quoting the tender to understand the difficulty and cost for carrying out the job in the station. It is important that contactor ascertain the quantum of work. Pouring of water in each earth pit is deemed to be included in the rate quoted. (iv) Necessary arrangement to be made by the contractor for pouring the water in earth pits. Vehicle reqd for carrying/storage of water (upto to the site) with helper will be arranged by contractor and deemed to be included in the rate quoted. (v) Cost of Maintenance of carrying vehicle (if any) and cost of fuel reqd for veh is deemed to be included in the rate quoted.

Supply only carbon based low resistivity compound Benzonite powder solution complete all as specified and directed by Engr-in-charge.

M& L for Earthing complete with galvanised steel earth plate electrode 60cm x 60cmx6 mm thick burried directly in ground (earth pit not less than 2.25 metres deep below normal ground level) with top edge of plate not less than 1.5 metre below normal ground level surrounded from all sides by 15 cm thick packed layer of charcoal dust and common salt ,filling in alternate layer and electrode connection by using galvenized iron earth lead wire 4 mm dia by means of bolt ,nuts,check nuts and washer made of galvenized iron or steel protected by light grade 15 mm dia GI pipe connected to main switch board or main control board and GI pipe light grade 20 mm bore for watering and including funnel ,wire mesh,RCC pit cover and PCC chamber pit with PCC 1:2:4 typ C2 including excavation and earth work ,disposal of surplus soil to a distance not exc. 50 mtr all as specified and as shown on plate no.5 of SSR part i 91991) incl dismantling of existing unsv earth pit all as specified and directed by EIC.

M& L for Earthing complete with galvanised steel earth plate electrode 60cm x 60cmx6 mm thick burried directly in ground (earth pit not less than 2.25 metres deep below normal ground level) with top edge of plate not less than 1.5 metre below normal ground level surrounded from all sides by 15 cm thick packed layer of charcoal dust and common salt ,filling in alternate layer and electrode connection by using galvenized iron strip 32x6 mm as earth lead by means of bolt ,nuts,check nuts and washer made of galvenized iron or steel protected by light grade 15 mm dia GI pipe connected to main switch board or main control board and GI pipe light grade 20 mm bore for watering and including funnel ,wire mesh,RCC pit cover and PCC chamber pit with PCC 1:2:4 typ C2 including excavation and earth work ,disposal of surplus soil to a distance not exc. 50 mtr all as specified and as shown on plate no.5 of SSR part i 91991) incl dismantling of existing unsv earth pit all as specified and directed by EIC.

M& L for Earthing complete with copper earth plate electrode 60cm x 60cmx3.15 mm thick burried directly in ground (earth pit not less than 2.25 metres deep below normal ground level) with top edge of plate not less than 1.5 metre below normal ground level surrounded from all sides by 15 cm thick packed layer of charcoal dust and common salt ,filling in alternate layer and electrode connection by using copper strip 20x3 mm mm as earth lead by means of bolt ,nuts,check nuts and washer made of copper and protected by light grade 40 mm dia GI pipe connected to main switch board or main control board and GI pipe light grade 20 mm bore for watering and including funnel ,wire mesh,RCC pit cover and PCC chamber pit with PCC 1:2:4 typ C2 including excavation and earth work ,disposal of surplus soil to a distance not exc. 50 mtr all as specified and as shown on plate no.5 of SSR part i 91991) incl dismantling of existing unsv earth pit all as specified and directed by EIC.

M& L for chemical earthing complete with copper earth plate electrode of size 90cmx60cmx5mm thick burried directly in ground vertically to th depth not less than 4.25 m below normal ground level , with top edge of the plate not less than 3.5 mt below normal ground level ,earth plate , surrounded by the packed layers of the mixture of magnisium sulphate (Mg SO4) -100 kg , common salt- 200 kg , charcoal dust -300 kg and also mixing of bintonite not mre than 25 kg with water connected with and including earth leads of copper stips 50x6 mm by means of bolt ,nuts ,check nuts, and washers of copper or thimbels and other end of the earth lead connected to main switch board and protection by galvenized iron pipe light grade 50 mm dia bore including watering pipe 20 mm dia bore GI meadium grade (ISI marked) with funnel and wire mess, including all necessary excavations and earth work , PCC chamber in plane cement concrete 1:2:4 tye B1 and RCC covered , all as shown in electrical plate no 3 of MES schedule part I (2009), complete all as specified and directed by EIC

Material and labour for copper earthing strip of size 20X3 mm including necessary brazing and connecting existing earthing system complete all as specified and directed.

Material and labour for Aluminium earthing strip of size 25X3 mm including necessary brazing and connecting existing earthing / lightning conductor system complete all as specified and directed.

Material and labour for GI earthing strip of size 32x6 mm including necessary brazing and connecting existing earthing system complete all as specified and directed.

Material and labour for GI earthing wire of size 4mm dia galvanised iron or steel wire including nesassary brazing and connecting with existing earthing system complete all as specified and directed.

Excavation in trenches not exceeding 1.5 m wide and not exceeding 1.5 m depth for laying of pipe/foundation etc or for shaft well cess pit manholes pier holes etc and not exceeding 1.5 m in depth and n. exc 10 sq m on plan and getting out in soft /loose soil complete all as specified and directed.

Returning filling in including spreding levelling watering and well ramming in layer not exceeding 25 cm thick in soft /loose soil complete all as specified and directed

M & L Galvanised iron tubing,15 mm bore,medium grade with all fittings for laying of Earth wire including all fixing accessories complete.

Removing excavated material (soil) to a distance not exc 50 m depositing where directed at a level not exc. 1.5 m above the starting point complete all as specified and directed

M & L for cutting of existing GI line for inserting of new Tee of suitable size and insertion of other fittings and accessories if required on site all as specified and directed

Supply and fix plug type bib taps ,cast iron,screwed for iron of size 15 mm all as specified and directed.

M & L Galvanised iron tubing,25 mm bore, light grade with all fittings for fixing on roof top of lightening air terminal rod including all fixing accessories complete.

Dismantling and taking down worn out and / broken air termination rod and supply and fixing new air termination,single pointed aluminium rod 12mm dia and 300mm long connecting with existing lightening conductor system complete all as soecified and directed.

Dismantling and taking down worn out and / broken air termination rod and supply and fixing new air termination,single pointed copper rod 12mm dia and 300mm long connecting with existing lightening conductor system complete all as soecified and directed.

M& L for Earthing pit with PCC 1:3:6 type C1 RCC 1:2:4 type B-1 40 mm thick cover reinforced with 6 mm dia M.S bars 3 Nos both ways with lifting hook made out of 6 mm dia bar of inner size 300 x 300x 300 mm depth with wall thickness 120mm , watering arrangement with funnel and wire mesh and 20 mm bore light grade G.I. watering pipe, complete all as specified and directed.

Supply and fixing funnel alongwith wire mesh in replacement of missing/unserviceable items all as specified and directed by Engr-IN-Charge

M& L for mixing of salt in water and pour into earth chamber pit through water pipe in adequate quantity to maintain earth resistance value as permissible limit complete including excavation ,refilling etc around earth electrode all as specified and directed

M& L for mixing of magnisium sulphate in water and pour into the earth chamber pit through water pipe in adequate quantity to maintain earth resistance value as permissible limit complete including excavation ,refilling etc around earth electrode all as specified and directed

M& L charcoal powder or coke powder in water and pour into earth chamber pit in adequate quantity to maintain earth resistance value as permissible limit complete including excavation ,refilling etc around earth electrode all as specified and directed

M&L for brazing/soldering to the copper earth strip of size 20x3.15 mm including dismantling from existing position ,eqiupments without disturbing the functional requirments of the equipments and reconnecting complete all as specified and directed.

M & L for disconnecting old test point and fixing new Test point terminal block made of gun metal or phosphorus bronze size 75x75x25mm drilled and screwed including 3 nos. 8mm dia 25m long hex. head screw including connecting with existing earthing strip complete all as specified and directed.

M/s Hindustan Trading Co

SHRI SIDHI VINAYAK INFRASTRUCTURE DEVELOPERS

M/S PRATAP BUILDERS

H C CONSTRUCTION

Industrial Traders