191N6024Q0023 Answers to Vendor questions.docx

Solicitation No.: 191N6024Q0023 Title: Supply & Installation of Underground diesel tank at Office building

VENDOR QUESTIONS:

Question 1:

Attachment # 3 SOW-2.3.1 states the new UST shall be double wall polymer jacketed steel tank. Please confirm that only a protective coating is required on the outer shell exterior side that contacts the soil. Also confirm what type and thickness of this proposed coating is. Polymer or Polyurethane or FRP etc. and thickness.

Consulate Answer:

Polymer Protective coating to be applied for outer shell contacts the soil.

Question 2:

Piping fill and suction piping - the standard mech specs indicate HDPE double wall pipe for this application. As this proposed pipe is not a containment type, secondary containment shall not be achieved. Please confirm that this is our understanding. Also please confirm what type of pipe need to be used for supply lines from the underground tank to the exterior generator day tank, basement generator and the additional feed at the basement?

Consulate Answer:

(Existing diameter to be maintained) Underground Fuel lines should be HDPE and not Steel (Per OBO Guidelines)

Question 3:

FOP - please confirm if a return line from the exterior Generator day tank overflow basin needs to be provided back to the new UST?

Yes

Question 4:

FOP - please confirm if the new supply and return lines need to be installed above ground (as extg) or need to be underground ? This raises another question on the type of pipe if secondary containment is required?

As existing partially underground and all other areas above ground

Question 5:

Based on the site inspection it was noted that most of the Fuel oil piping (FOP) is above ground, can ASTM A53 seamless black steel pipe with welded and threaded fittings be used in this project through out?

Underground Pipes should be HDPE,above ground can be Steel Pipe

Question 6:

SOW 2.13 page 98, please confirm that Remote Fuel port is not required in this project as per the site walk. The Consulate intends to dump fuel directly in to the bulk tank at the manhole chamber thru 4" inlet fitting? The contactor to however install the over fill prevention valve in the fill line. Please confirm.

fuel port is not required

Question 7:

Leak detection - please confirm that the leak detection scope shall cover primary/secondary leak of the tank with the leak sensor at the interstitial well and leak/ spill at the manhole/sump (where all fittings enter the tank) using a leak sensor. These sensors will relay information to the main controller that shall be installed inside the FM office at the basement?

Consulate Answer:

Yes

Question 8:

Inventory control - please confirm scope is limited to the main bulk tank that will provide the fuel qty, volume etc. back to the main controller that will be installed in the basement FM office. If flow meters are needed for the generator consumption, they shall however not integrate with the tank inventory. Please confirm?

Consulate Answer:

Flow meter for individual generator to be installed however inventory control is required only for main bulk tank.

Question 9:

SOW 2.4.1, 2, 3 - As per site meeting, the contractor shall dispose off the residual fuel from the existing tank and no need for storage of fuel to be planned by contractor. In addition, please confirm that no temporary piping, storage of fuel etc. for the Post's operation of Generator is to be planned by contractor.

Vendor is required to remove the available fuel in existing tank and proper disposal procedure as TNPCB to be followed and no temporary arrangements required.

Question 10:

SOW - please confirm that the new fuel pump shall run when there is fuel demand from existing exterior mounted 3000 Ltr day tank? Also please confirm that the extg 3000 ltr day tank has electrical contacts for new pump automation?

Consulate Answer:

The new fuel pump is to be operated when demand in 3000 ltr day tank arises, the pump to be located near the UG tank as existing and all electrical supplies are available in the location.

Question 11:

SOW - As per site discussion isolation valves shall be provided in the piping for basement supply lines by the contactor. While demand for fuel for basement loads arise, the pump controller shall be turned to manual mode and isolation valves closed for the 3000 ltr day tank supply. Please confirm that this sequence is acceptable.

Consulate Answer:

Yes the sequence is acceptable

Question 12:

Leak detection – Please confirm that the leak detection scope is limited to the bulk storage UST and no requirement for the FOP field piping and manholes. This was discussed during the site inspection.

Leak detection scope is limited only to the UST

Question 13:

Please confirm that all the existing piping, pump, fittings, existing Fuel storage tank and its accessories (within the SOW) are to be disposed offsite by the Contractor.

Consulate Answer:

Yes all waste material to be removed by vendor on weekly basis

Question 14:

SOW 2.0 Please confirm the type of new fuel pump in this project? whether it shall be a submersible turbine pump installed inside the new tank? Or a centrifugal / monobloc type that shall be installed inside existing motor room above ground as per existing?

Consulate Answer:

centrifugal / monobloc type

Question 15:

Page 102 – The liquid level indication shall be electronic display as per the SOW with digital instruments at the fuel tank using control cables to the operator room. Please clarify the 2” Schedule 40 steel pipe requirement to the operator’s room.

Consulate Answer:

Agreed

Question 16:

2.7.4 page 96, please clarify the requirement for 2.7.4 as remote fuel fill port is not required as per site visit discussions?

Consulate Answer:

Refer answer for question 6

Question 17:

Drawing indicates excavation includes with cushion of 1' on all four end as working area, which is not practically possible, (may lead to soil sliding). Can we have another 1.5-meter additional cushion for excavation at the toe of the pit on all sides to avoid soil sliding? Is all excavation manual or through any mechanization - Mini JCB?

AS per site measurements the area available can be utilized with shoring for setback depth to be decided based on vendor design details. Manual excavation is recommended due to space constrains.

Question 18:

On understanding the soil condition and space availability around the tank location 1:1 excavation clearance shall be provided or otherwise shoring provision to be allotted.

Wooden plank Shoring to be done as per site requirement.

Question 19:

In case of encountering ground water table, necessary de watering arrangements are to be added to scope. Please confirm.

Necessary pumps for dewatering will be provided by consulate vendor needs coordinate with facility technicians for dewatering

Question 20:

Any services encountered during excavation, can rerouting charges and services be additional? Or will it be handled by consulate?

Consulate Answer:

rerouting charges and services will be handled by consulate

Question 21:

Manhole for monitoring Vapor -Can it be FRP if so how many ton capacity? Any vehicular movement would be there?

Consulate Answer:

Yes FRP is accepted no vehicular movement

Question 22:

Is waterproofing protection to be done at external RCC Wall before earth fill to avoid any dampness? Is plastering required at the internal wall too ? Does any waterproofing to be done at the top slab substrate?

Consulate Answer:

Waterproofing is required, hot bitumen coat is required on the outside, since water table is high.

Waterproofing is also required on the inside 2 layers of torched bitumen membrane over a primer coat and on top also.

Question 23:

Removal of existing tank as per BOQ SL No -1, Does it include all breaking of existing RCC elements present? Is the proposed tank to be fit in same location of existing? Any contaminated diesel to be removed?

All included in vendor scope.

Question 24:

Can the RCC be M25 or M30? Any integral admixtures to be added? Can RMC be planned, and will there be access permitted? Can the pouring be done at double lift?

Consulate Answer:

Please refer drawing for RCC mix, RMC can be planned however due to space constrains longer chute is required to lay concrete

Question 25:

For salt free sand filling - can we use pit sand or any dry sand - M Sand /River sand?

Consulate Answer:

M sand can be used (Top layer of 250mm to be finished with river sand)

Question 26:

Should the inner sheath of the metal diesel tank to have any coatings? or any aluminium alloy finishes? Or any anticorrosion coatings?

Consulate Answer:

No inner coatings required

Question 27:

Can the MS Diesel tank have multiple joints or to maintain any nos. strictly? To reduce the joints separate coil has to be placed order in advance with rolling.

Consulate Answer:

Joints to be followed as per IS code for diesel tank

Question 28:

Should we have any bracing support from the RCC Wall on sides to support and avoid tiltable movement of the tank position? Can any pedestal with brick or RCC can be framed at the base of Slab to balance the equilibrium and position the tank?

Consulate Answer

Refer scope of work

Question 29:

Does the diesel tank require fire and explosives license? Because this can be opted by Fire and safety dept for complying with safety norms? Whether this should be added in our scope? Or consulate will avail the same? This will incur commercial cost difference.

Consulate Answer

Not part of the scope

Question 30:

For tank manhole it is shown as 9" brick works. PCC and resting are bit unfriendly. Can we opt for RCC base and develop with brick works?

Consulate Answer

Kindly follow the scope of work

Question 31:

Can the top finish level be of existing NGL or can be elevated? If so, projection till what level to avoid surface water entry?

Consulate Answer Existing level in the finished level. Manhole height to be increased

Question 32:

The contractor shall provide temporary storage or no need.

Consulate Answer Temporary storage for contractor tools and materials will be provided by consulate

Question 33:

Can we change the size of the UST as per your specification, only on dimension change for 10kl we will provide our dimension drawing.

Consulate Answer

Refer scope of work and submit your design

Question 34:

Instead of HDPE Pipe can we use ASME SA53?

Consulate Answer

Refer answer for question number 5.

Question 35:

Escorts for the project duration will be provided by Consulate?

Yes

Question 36:

Free of Cost Water & Electricity will be provided by Consulate?

Consulate Answer

Yes. Water & Electricity will be provided by the Consulate.

Question 37:

As per SOW, 10KL UGT Double wall tank should be of Polymer coating but as per our understanding it is 10KL Mild Steel Tank coated with Fiber Glass Coating along with epoxy painting. Please confirm.

Consulate Answer Fiber glass coating is also acceptable.

Question 38:

Instead of All HDPE Double Wall pipeline we are going with Double wall Jacketed Seamless Sch 40 Pipeline.

Consulate Answer Refer answer for question number 5 Double wall Jacketed Seamless Sch 40 Pipeline acceptable for above ground piping.

Question 39:

As per SOW, Inventory Management System in bulk Tank and Flow Meter to be installed in further 3000 Litres belly tank and DG Day Tank. But we propose that we do not need to install separate Flow Meter for 3000 litres Belly Tank and DG Day Tank, it can be managed through Inventory Management System only. Please confirm.

Refer answer for question number 8

Question 40:

As per SOW the Existing Belly Tank & Bottom DG Day Tank should be Automated in every aspect, but as per your current situation they cannot be modified. So if you want they should be Automated then we need to replace it with New DG Day Tanks. Please confirm.

Not required (existing system to be followed)

Question 41:

A dedicated Area for storing New Material & Debris will be provided by the consulate. Please confirm.

A area for storage will be provided however weekly basis of debris removal to be planned

Question 42:

As per your inputs of ground water level, we suggest you to add the scope of Separate sump with pump at the Tank pit so that excess water can be taken out automatically during the peak Monsoon season.

Consulate Answer Agreed to consider

Question 43:

As per site visit, we have seen 1 No. existing Fuel Transfer pump but in Delhi Embassy we have installed 1 Running + 1 Standby Motor Pump.

Consulate Answer Yes, we support this recommendation.

Question 44:

Distance Between HSD Yard Area and proposed installation of Inventory Management System Monitor in Basement Office. And also we cannot lay the System cable with existing electrical cable route so we will be laying through different route, Kindly advise us approx. distance for the same.

Consulate Answer Approximately 200meter.

Question 45:

As per SOW, we need to provide you Remote filling Port, Please advise your inputs.

Consulate Answer Remote filling Port Not required.

Question 46:

As discussed, we need to replace the existing pipeline of DG Day Tank, if yes then please advise us measurement of Pipeline.

Consulate Answer Approximately 100 meters. (Two runs to be considered)

Question 47:

As per SOW, we need to provide you temporary arrangement for Fuel stored in Existing HSD UGT Tank, please provide your inputs.

Consulate Answer Refer answer for question no 9

Question 48:

Kindly help to provide if you have any kind of Data related to existing HSD Yard running like schematic drawing.

Consulate Answer Not available.

Question 49:

In BOQ Sl. No.3 demands quote for 10KL Capacity, however the dwg shared by you indicates 27 KL. Kindly confirm which one to be followed. Is dwg for conceptual purpose?

Consulate Answer Yes, it is for conceptual purpose, contractor needs to prepare shop drawings based on site conditions.

Question 50

Kindly confirm if 10KL - how much free board to be considered?

As per standard market practices.