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{"sheet":"Clarifications","index":0,"n_rows":33,"n_cols":6,"rows_kept":33}
[]
[null,"No.","Clause / Drawing Reference","Query","Interim assumption adopted for pricing (pending your response)","Response"]
[null,"A","MECHANICAL EQUIPMENT – SPECIFICATION AND SUPPLY"]
[null,"A1","PSX 1.1.2, PSX 1.3.2, PSX 1.4.2","Please confirm that no plant, equipment or material is free-issued by Johannesburg Water, and that no existing or JW-held equipment is to be refurbished or re-used under this Contract.","No free issue. All mechanical plant is Contractor-supplied and new.","No plant, equipment or material is free-issued by Johannesburg Water, and no existing or JW-held equipment is to be refurbished or re-used under this Contract."]
[null,"A2","PSX 1.1.2, PSX 1.3.2, PSX 1.4.2","The removed equipment is to be transported to “the Employer’s / Client’s stores”. Please confirm the location of the store and the haul distance from the Van Wyksrust Pump Station.","Store located within the Olifantsvlei WWTW boundary. Haulage beyond the WWTW boundary excluded.","The Employer’s / Client’s store is located within the Olifantsvlei WWTW boundary. Therefore haulage distant from Van Wykrust Pump Station to elsewhere on the Olifantsvlei WWTW will not exceed 2.5km."]
[null,"A3","M18; PSX 1.3.3, PSX 1.2.3, PSX 1.4.3","No pump manufacturer is nominated and no approved-vendor list is issued. Please confirm that pump make and model are the Contractor’s selection, subject to the Employer’s Agent’s approval, and advise whether JW maintains a list of pre-approved makes.","Make and model as offered in our returnable technical schedules; a directed change of make after award to be treated as a variation.","The pump make and model are the Contractor’s selection, subject to the Employer’s Agent’s approval based on compliance with the Tender Specifications. JW does not maintain a list of pre-approved makes."]
[null,"A4","PSX 1.3.3; Drawing BW1400-RHD-C1-02-D-E-0256; PSY 2.1","No motor rating is stated in the mechanical specification for the four main pumpsets. The MCC schematic indicates 185 kW, 4-pole, 400 V VSD per pump, and PSY 2.1 records that the motor schedule ratings are provisional. Please confirm 185 kW as the design basis, and confirm that any re-rating of the VSD, starter, cabling, transformer and standby generator arising from the finally selected pump will be re-measured.","185 kW, 4-pole, 400 V, premium efficiency, VSD-rated motors. Re-rating of downstream electrical equipment excluded.","Based on pump requirements, motor size is expected to be 185 kW. Any rerating of electrical equipment will be remeasured."]
[null,"A5","PSX 1.3.3; M18.3.1","Three duty points are specified at a fixed speed – 580 ℓ/s @ 24 m (η > 83%), 650 ℓ/s @ 21,5 m (η > 81%) and 340 ℓ/s @ 30,9 m (η > 71%). Please confirm which point is the guaranteed (governing) duty and whether the remaining points define the required operating range rather than separate efficiency guarantees.","1st duty point (580 ℓ/s @ 24 m, η > 83%) taken as the governing guaranteed duty.","The 1st duty point (580 ℓ/s @ 24 m, η > 83%) will be the guaranteed duty point. The pumps must also be capable of achieving the 2nd and 3rd duty points, but the effeciency need not be guaranteed at these points. However, the Employer's Agent will reasonably compare the pump performance data against duty points 2 and 3, before acceptance."]
[null,"A6","M18.3.3","M18.3.2 and M18.3.4 specify the casing and shaft materials, but M18.3.3 does not specify an impeller material. Please advise the required impeller material and any minimum hardness for screened raw sewage containing solids.","Wear-resistant high-chrome / duplex-equivalent impeller material.","The required impeller material is a wear and corrosion resistant high-chrome stainless steel such as CA6NM, or similar."]
[null,"A7","M18.5; M18.3.2","M18.5 permits either stuffing-box glands or 316 SS cartridge mechanical seals with SiC / TC faces. Please confirm which is required. M18.3.2 calls for a gland-water tapping – please advise the source, pressure and flow rate of the gland / seal service water.","316 SS cartridge mechanical seals (SiC/SiC faces) with one spare per size and type. Seal flush taken from the new wash-water system at the pressure available; no separate seal-water skid, cooler or filtration priced.","Either gland seals or mechanical seals are acceptable, but mechanical seals are prefered. A separate seal flush system was not envisaged for the pumping installation. If a gland/seal service water is required for the accepted pumps, it will be handled as a remeasurable item."]
[null,"A8","G02 (Vol 2B); M18.19, M20, M21, M01","All mechanical corrosion protection is referred to Particular Specification G02, which states only that the Golder Associates Africa “Corrosion Protection Specification… 2006 Edition” applies and that a copy will be made available to the Contractor AFTER Contract award. The governing coating specification is therefore not available at tender stage. Please issue the specification, or confirm the coating systems and dry film thicknesses required.","FBE 250 µm internally to pipework and 200 µm to valves per M20/M21; two-pack epoxy to 250 µm total DFT on fabricated steelwork and equipment. Any requirement of the Golder 2006 specification exceeding this to be re-measured on issue.","FBE 250 µm to internal and external valves and pipework is acceptable. Fabricated steelwork and equipment should be two componant epoxy followed by polyurethane with a total thickness of 300 µm. Any additional requirements exceeding this will be re-measured."]
[null,"A9","PSY 2.6; E04, E17","PSY 2.6 requires the MCC to be manufactured by “an approved supplier with proven track record”, but no vendor list is issued and “approved” is not defined. Please issue JW’s list of pre-approved MCC manufacturers, or confirm that the builder is the Contractor’s selection subject to approval of workshop drawings.","South African MCC builder to E04 / E17, Form 3b, front access, subject to drawing approval before manufacture.","There is no list of pre-approved MCC manufacturers. The builder is the Contractor’s selection subject to approval of workshop drawings."]
[null,"A10","PSY 1.2.1; E03, E04","Twenty local control panels are required (5 screening, 4 main pump, 11 auxiliary). Please confirm no panel builder is nominated and that E03 / E04 govern.","Locally manufactured panels to E03 / E04, subject to approval of workshop drawings.","No panel builder is nominated. Locally manufactured panels to E03 / E04, subject to approval of workshop drawings, will be acceptable"]
[null,"A11","PSY 1.2.1; E17","Please confirm that the VSD make is the Contractor’s selection subject to compliance with E17, and advise any JW standardisation requirement for drives across the Olifantsvlei site.","VSD compliant with E17 at 185 kW, with line reactor and category C3 EMC filter and local South African support and spares.","VSD make is the Contractor’s selection, subject to compliance with E17."]
[null,"A12","PSX 1.3.3, PSX 1.3.2, M18.8, M18.9, E01 (General Req. (g) and Additional Req. (c))","Four conflicting drive / starting requirements apply to the same equipment: variable speed operated at fixed speed (PSX 1.3.3); four VSDs (PSY 1.2.1); a fixed-speed motor with a speed reducer / gearbox (M18.8, M18.9) whereas PSX 1.3.2 requires a directly coupled 4-pole motor; and DOL for all motors (E01 (g)) versus soft starters for motors ≥ 55 kW (E01 (c)). Please confirm the governing requirement.","Directly coupled 4-pole VSD-rated motor with VSD starting and control. No gearbox / speed reducer and no soft starter priced. Motors priced with VSD-duty insulation but without insulated NDE bearings, dV/dt or sine filters.","Pump/motor shall be directly coupled and VSD driven. No gearbox and/or soft starter required."]
[null,"A13","E01 General Requirements (a) – (e)","E01 requires motors to be manufactured in South Africa, with imported motors accepted only where integral to the equipment offered and then subject to SABS testing to SANS 1804-2. Please confirm this applies to the main pumpset motors where an imported pump is offered.","SA-manufactured motors where the offered pump make permits; SABS testing and certification cost included where an integral imported motor is supplied.","All motors, including those for the main pumpsets, shall be manufactured in South Africa. Imported motors shall  accepted only where integral to the equipment offered and then subject to SABS testing to SANS 1804-2."]
[null,"A14","Drawing BW1400-RHD-C1-02-D-M-0242","The pipe schedule shows VP-06 as a DN450–DN500 eccentric enlarger (suction) and VP-07 as a DN400–DN500 concentric enlarger (delivery), which fixes the pump nozzles at DN450 / DN400. At 580 ℓ/s this gives approximately 3,6 m/s and 4,6 m/s respectively. Please confirm the nozzle sizes are indicative and may be adjusted to suit the accepted pump.","Enlargers and spools priced as scheduled; adjustment to suit the accepted pump’s nozzles to be accommodated under Provisional Sum item 4.2.20.","The nozzle sizes are indicative and may be adjusted to suit the accepted pump. Adjustment to nozzles sizes, and pipework in general, compared to as listed in the BoQ, will be remeasured.  "]
[null,"A15","PSY 2.1; Drawings E-0255 to E-0262","The MCC schematics show a 3 kW wash-water pump, whereas the Scope of Work rates the wash-water (final effluent) supply pumps at 7,5 kW. Please confirm the correct rating and which feeder serves which pump set.","MCC starters, cabling and protection priced to the ratings shown on the schematics; re-rating arising from the final equipment selection to be re-measured.","MCC equipment, starters, cabling and protection to be priced to the ratings shown on the schematic. Any re-rating arising from the final equipment selection to be re-measured."]
[null,"B","BILL OF QUANTITIES vs SPECIFICATION AND DRAWINGS"]
[null,"B1","PSX 1.1.2, 1.3.2, 1.4.2; BoQ Section 4","Each of these clauses requires removal of the existing screens, conveyor, pumps, valves, pipework and ancillaries and transport to the Employer’s stores, but there is no item for this work anywhere in Section 4 (Mechanical). The Civils bill covers only site clearance, the skip slab and the crawl beam, and the E&I bill covers only MV equipment. Please confirm whether an item is to be added or whether the work is deemed included.","Allowed within the mechanical installation rates, assuming the store is within the WWTW boundary.","The removal of existing mechanical equipment, and transport thereof to the Employer's stores, is to be included in the Mechanical BoQ item rates."]
[null,"B2","PSX 1.1.2, 1.1.4, 1.1.9; BoQ 4.4.13 / 4.4.14","PSX 1.1.2 requires 4 off 6 m³ skips with dollies and a rail system, but items 4.4.13 and 4.4.14 cover only “waste skip trolleys and tracks”. Please confirm whether the skips themselves are to be supplied under this Contract.","4 off 6 m³ skips allowed within items 4.4.13 / 4.4.14.","The skips are not to be supplied under this contract."]
[null,"B3","PSX 1.1.2, PSX 1.1.8; BoQ 4.6.5","Three capacities are stated for the wash-water storage tank: 4 750 m³ (PSX 1.1.2), 5 000 ℓ heavy-duty polyethylene (PSX 1.1.8) and 4 750 ℓ HDPE (BoQ 4.6.5). Please confirm the required capacity.","1 off 4 750 ℓ HDPE tank as billed; “4 750 m³” assumed to be a typographical error.","The required capacity is as per stated in the BoQ, i.e 4 750 ℓ."]
[null,"B4","PSX 1.1.8; BoQ 4.5.2 / 4.5.3","PSX 1.1.8 requires, for the booster set, a DN65 suction isolating valve and a DN65 discharge isolating valve to each pump, a DN65 NRV on each discharge, a DN65 isolating valve to each wash compactor and a float valve on the tank inlet (6 isolating valves, 2 NRVs, 1 float valve). The BoQ bills only 2 isolating valves and 2 NRVs. Please confirm the correct quantities.","Additional 4 off DN65 isolating valves and the float valve allowed within items 4.5.2 and 4.5.6; re-measurement requested.","Price as per the quantities listed in the BoQ. Any additional valves and size adjustments will be re-measured."]
[null,"B5","PSX 1.2.3; BoQ 4.6.2 / 4.6.3 / 4.6.4","PSX 1.2.3 requires suction and discharge isolating valves to each pump, an NRV on each discharge (all DN100 PN10) and a tank inlet float valve, with 304 SS pipework. The BoQ bills only 2 isolating valves and 2 NRVs, and does not state 304 SS for the DN100 manifold. Please confirm quantities and manifold material.","Additional 2 off DN100 isolating valves and float valve allowed within items 4.6.2 / 4.6.7; DN100 manifold priced in 304 SS.","Price as per the quantities listed in the BoQ. The manifold material shall be of 304ss. Any additional valves and size adjustments will be re-measured."]
[null,"B6","PSX 1.3.4; BoQ 4.3.6, 4.3.7, 4.3.13, 4.3.14","PSX 1.3.4 requires 2 off DN200 PN10 sewage air valves and 2 off DN200 PN10 air-valve isolating knife gate valves. The BoQ bills 4 off DN200 PN06 air release valves and 4 off DN200 PN10 gate valves. Please confirm the correct quantities and the pressure rating of the air valves.","Priced at the billed quantities, with air valves at PN10 to match PSX 1.3.4. Re-measurement will apply.","Price at the BoQ quantities. Air valves may be rated at PN06 (as per the BoQ). Any adjustments to the quantities and ratings will be re-measured."]
[null,"B7","PSX 1.4.2, PSX 1.4.6; BoQ 4.7.2 / 4.7.4","PSX 1.4.2 states 3 off 650 x 650 mm penstocks with 4 m spindles, while PSX 1.4.6 states 3 off 610 x 610 mm with spindles of 2 off @ 5,0 m and 1 off @ 7,3 m. The BoQ bills 650 x 650 mm with no spindle length. Please confirm the opening size and spindle lengths.","650 x 650 mm as billed, with spindles at 2 off 5,0 m and 1 off 7,3 m; final sizes","Price as per the BoQ, ie. 650 x 650 mm. Spindle lengths at 2 x 5.0m and 7.3m is correct."]
[null,"B8","Drawing M-0242; BoQ 4.2.6 / 4.2.9","The pipe schedule describes VP-07 and VP-11 as CONCENTRIC enlargers; the BoQ describes both as ECCENTRIC. The BoQ also omits the individual straight-pipe lengths given on the schedule. Please confirm the drawing governs.","Priced per the drawing schedule (concentric) and at the scheduled lengths.","Price for the reducers as per listed in the BoQ, i.e: eccentric. Price for the lengths of the straight pieces are per the pipe schedule on the drawing."]
[null,"B9","PSX 1.4.4, PSX 1.4.5; BoQ 4.8.2 / 4.8.3","The BoQ describes these provisional sums as “Repairs to HVAC” and “Repairs to lifting equipment”, whereas PSX 1.4.4 requires a NEW ventilation system (0,37 kW extraction fan and 24 m of ducting) and PSX 1.4.5 requires REPLACEMENT lifting equipment (new 3-ton electrically operated hoist and crawl). PSX 1.4.1 records that all ancillaries have been vandalised or stolen. Please confirm the intended scope of these sums.","Sums carried as billed, understood to cover full replacement; any shortfall to be instructed and re-measured.","The intended scope is full replacement of HVAC and Lifting equipment. The specifications thereof will be determined during construction."]
[null,"B10","PSX 1.4.2, PSX 1.4.3; BoQ 4.8.6","PSX requires 2 off (1 duty, 1 standby) 1,5 kW submersible drainage pumps, each with an estimated 7 m DN80 galvanised discharge, ball-type NRV and flexible connection. BoQ 4.8.6 bills “1 No”. Please confirm whether this is one pump or one complete installation.","Priced as one complete installation comprising 2 off pumps, both discharge lines, NRVs, flexible connections and float control.","Price as per the BoQ description for 1 complete submersible pump installation, which comprise 2 pumps and associated valves, fittings and pipework."]
[null,"B11","Drawings C-0201, C-0302, C-0401, C-0501, C-0901","The pump plinths, bypass chamber, generator slab, elevated guard house and screening facility slab are marked “ON HOLD”, subject to final detail design based on equipment requirements to be provided by the Contractor. C-0401 also notes “generator by others”, C-0501 “guard house by others” and C-0901 “rail by others”, although the generator and skip rails are billed under this Contract. Please confirm the scope split and how redesign of these elements will be dealt with.","Priced exactly as drawn. Redesign or requantification arising from the accepted equipment excluded and to be re-measured.","Construction details and drawings for the \"ON HOLD\" items will be issued later, by the Employer's Agent, on receipt and acceptance of the final equipment details from the Contractor.  Any adjustment in quantities will be remeasured. "]
[null,"C","COMMERCIAL AND ADMINISTRATIVE"]
[null,"C1","PSX 1.1.11, PSX 1.2.4, PSX 1.3.5; BoQ Section 4","These clauses limit payment for manufacture, supply and delivery to 80% of the BoQ item, with installation being the balance of 20%. The BoQ instead splits supply and installation into separate priced items, which for the main pumpsets (4.1.1 / 4.1.2) produces a split of approximately 89% / 11%. Please confirm whether the 80/20 rule will be applied to each supply-plus-installation pair.","Priced in accordance with the BoQ item split as billed.","The 80/20 rule will not be applied to the supply-plus-installation pair. Supply and installation will be proportioned as per the BoQ pricing."]
[null,"C2","PS 6.x – delivery period; PSX 1.3, PSY 1.2.1","A 24-week material delivery period is stated. Please confirm this is acceptable for the main pumpsets, MV switchgear, transformer, generator and MCC / VSDs, all of which may exceed it, and confirm the date from which delivery is counted.","24 weeks from award taken as the basis; longer OEM lead times to be dealt with as an extension of time event.","The 24-week shall be counted from the Employer's Agents approval of the Contractors equipment selection. The full works shall be completed within 18-months. The Contractor must programme for the submission of equipment details, reasonable period for Employer's Agent approval (14 days), allowance for revision and resubmission, the ordering and delivery period, as well as the  installation and commissiong of the equipment, such that Completion can be attained within 18 months fromCommencement of the Works. Any occurances which impact on the programme will be handled during construction within the conditions of the contract."]