Project:My Home
Mechanical Deviation List
S. No.
Tender Doc/
Clause
1
3.02-1 P7
Six (6) Nos. Waste Heat Recovery Boilers - Complete with De-duster
chamber, dampers, fin-welded water-cooled tubes……
2
3.02-2 P7
Desuperheaters (attemperator) for superheater temperature control along
with pneumatic operated diaphragm control valves and spray water piping
from boiler feed pumps discharge to attemperator inlet complete with
valves, fittings etc., for each Boiler.
3
3.02-3 P7
One 100% feed water-regulating station with 100 % Bypass with
Motorised Valve with inlet and outlet valves for each station of each
Boiler.The control valves should be diaphragm operated.
4
3.02-13 P8
Hammering system for removal of dust (Rapping system with drive
motors, gear box set up), as per requirement and design for each Boiler.
3.02-14 P8
One (1) No. Each HP Chemical dosing systems (MSRL) for each boiler
consisting of dosing tank, motorized agitator, high pressure plunger
pumps, discharge safety valves, isolation valves etc., and associated
carbon steel piping
3.02-20 P8
Main steam piping along with motor operated stop valve and motor
operated integraMain steam piping along with motor operated stop valve
and motor operated integral bypass valve, non-return valve, flow nozzle
with fittings, necessary trap stations, pipe supports, hangers, etc. upto the
Steam Turbine including the common steam header.l bypass valve
5
6
Sinoma Energy Conservation Ltd.
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Content in Tender Document
25/04/2012 Rev 1
Project:My Home
Mechanical Deviation List
7
3.02-26 P8
Draught gauges at inlet & outlet of de-duster, economizer, super heater
and Boiler bank.
8
3.02-35 P9
Turbine Bleed System covering uncontrolled extractions for Low Pressure
Heater, High Pressure Heater and Deaerator
9
3.02-37 P9
Emergency Overhead Oil Tank with SS Valves and Fittings, Oil vapour
Exhaust Fan, Centrifuge, and all Interconnecting Piping, Valves and
Fittings, etc
10
3.02-40 P9
PRDS for auxiliary steam for ejectors and gland sealing system, which
includes control valve, inlet, outlet and bypass valves, and all
accessories, inter connecting piping etc.
11
3.02-41 P9
2 x 100 % steam operated Main Ejector (two stage) along with Condenser
and one (1) No. Startup Ejector
3.02-43 P10
Condensate Piping from Condenser Hotwell to Deaerator Inlet,
Condenser level Control Station along with all necessary valves and
accessories. Hotwell minimum level recirculation piping with control valve
station and all valves and accessories.
3.02-62 P11
Balance of plant piping along with fittings, valves, instruments, supports,
painting, thermal insulation, coating and wrapping where required, for
various services such as steam, cooling water, feed water, DM water,
instrument air etc., as required for the Boilers and STG Island
12
13
14
Sinoma Energy Conservation Ltd.
4.01 P15
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STG shall be designed for operation in any one of the following
conditions: a). Parallel with the State Grid System / Captive Power Plant.
b). Island Mode of Operation catering the Cement plant load or power
plant load alone
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Project:My Home
Sinoma Energy Conservation Ltd.
Mechanical Deviation List
15
4.01 P16
The Pump Head shall be maximum Deaerator pressure including
pressure drop across the heaters in line like GSC, Ejector, LP Heater etc.,
as possible and Static and Dynamic Head under maximum capacity
condition.
16
4.02 P18
Conductivity at 20 deg. C measured in sample condensed downstream of
a strongly acid cation exchanger and after removal of CO2(<0.3)
17
6.02 P23
The first pass shall be made of water cooled membrane walls which will
recover the heat from the waste heat gas by radiation as well as by
convection
18
6.02 P23
No header shall be placed in the flue gas path.
19
6.04 P25
Blow down provisions shall also be provided for drum with isolation and
regulating valves provided at accessible position and capable of
controlling the blow down rate from 0.05% minimum to 4% maximum of
the WHRB steam rating
20
6.04 P25
21
6.04 P25
22
6.08 P26
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All drains which require traps shall be fitted with necessary isolation and
bypass valves located in accessible location.
The steam drum shall contain the following minimum connections:
Steam / water sampling connections
Necessary soot blower provision shall also to be made for the
economizer.
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Project:My Home
Mechanical Deviation List
6.09 P26
Condensate pre-heater (CPH) shall be considered as the additional heat
recovery unit to raise the condensate temperature before entering into
de-aerator to reduce the steam consumption in de-aerator
24
6.12 P27
The Casing sheet minimum thickness shall be 8 mm minimum with
adequate stiffeners and is to be designed for maximum possible gas
pressure in the Boiler with 10% over pressure and 3 mm corrosion
allowance.
25
6.14 P28
These shall have internal liners to prevent vibrations and joint
deterioration
26
6.15 P28
BIDDER should specify necessary Soot removal arrangement
considering the nature of the exhaust gas and the type of the ash in the
flue gas.
27
6.16 P29
WHRBs shall be supplied with individual HP Dosing system for TriSodium Phosphate dosing into the steam drum.
28
6.18 P30
Each feed control station shall comprise pneumatic operated control
valves with a bypass valve similar to main valve
29
7.02 P31
The STG will have three / two bleeds for regenerative heating using HP
Heater (if required), LP Heater and Deaerator.
30
7.04 P34
The surface condenser connected to the turbine exhaust shall be of two
pass water cooled with divided water box and shall be designed as per
HEI, USA for the thermal rating and ASME Sec VIII Div.1 for strength.
31
7.04 P34
32
7.04 P34
33
7.04 P34
23
Sinoma Energy Conservation Ltd.
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The condenser hotwell capacity shall be minimum 3 min between normal
and low level when maximum steam is condensed.
The condenser shall be of designed so that the oxygen content of the
condensate leaving the condenser shall not exceed 0.02 ppm
Suitably designed expansion bellow made out of stainless steel shall be
provided between the turbine exhaust and the condenser, to allow for
thermal expansion of the turbine exhaust hood.
25/04/2012 Rev 1
Project:My Home
Sinoma Energy Conservation Ltd.
Mechanical Deviation List
34
7.04 P34
The capacity shall be so as to reach about 70% vacuum in 20 minutes
time
35
7.05 P36
The material of the cooler shall conform to the requirements of API 614
36
7.05 P36
37
7.05 P37
38
7.08 P39
39
40
8.02 P41
8.02 P41
41
8.04 P44
42
8.05 P44
43
8.05 P44
44
8.05 P50
About the designed standard for piping
The Rubber Expansion Joints shall be able to handle the axial, lateral,
angular or rotational movements or a combination of one or more of
above at all operating conditions and shall be capable of absorbing the
equipment vibrations
45
8.05 P51
PLATFORMS, WALKWAYS, LADDERS ETC
46
8.08P52
Entire Flue Gas ducting along with isolation dampers from pre heater
tapping point to boilers and back to the system will be done by BIDDER,
including Engineering & Fabrication or Ducting / Dampers
47
8.08 P53
Entire Flue Gas ducting along with isolation dampers from pre heater
tapping point to boilers and back to the system will be done by BIDDER,
including Engineering & Fabrication or Ducting / Dampers
48
8.08 P53
All the flue gas ducts in PH boiler shall be fabricated from carbon steel
plates of minimum 8 mm thk
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The interior of oil reservoirs shall be desalted and rust proofed with a
permanent coating
About Overhead lube oil tank
Depending on the requirement, suitably sized gear box shall be provided
between the steam turbine and generator incase direct coupled machine
is not offered
b) Dissolved O2 in Deaerator water - 0.007 ppm
About LP dosing system
The pumps shall be designed with 15% margin on flow and 30% margin
on head.
All pipes of size NB 50 & below shall be schedule 80 thickness for all
applications except for SS material
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Project:My Home
Sinoma Energy Conservation Ltd.
Mechanical Deviation List
49
8.08 P53
in AQC boiler air ducts shall be fabricated from carbon steel / stainless
steel plates of minimum 8 mm thick with adequate stiffeners
50
8.08 P53
All dampers shall be of the `louvre' or butterfly type with the necessary
frames, shafts, blades, bearings, linkages, seals etc.
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Mechanical Deviation List
Sinoma's Deviation/Clarification
Page: 7 / 12
Note
For AQC boiler, the de-duster chamber is installed at the
bottom of AQC boiler.
For SP boiler, there is no de-duster, and the tube is
plain tube.
Desuperheaters for superheater temperature
control along with motorised control valves.
The desuperheater system is just designed for
AQC boiler main steam stage. For SP and AQC
boiler LP superheater, there is no desuperheater
system.
Motorized control valve and Motorized stop valve
will be supplied. No bypass motorized valve in feed
water station.
Hammering system is only designed for SP boiler.
No discharge safety valve is dosing system.
No motor operated intergral bypass valve and non
return valve is main steam piping.
Sinoma Energy Conservation Ltd.
25/04/2012 Rev 1
Project:My Home
Mechanical Deviation List
Page: 8 / 12
The de-duster chamber is installed at the bottom
of AQC boiler, so there is no gauges at outlet of deduster.
There si no LP heater and HP heater
There is no overhead oil tank with SS valves and
fittings.
No PRDS for ejectors and gland sealing steam.
The steam for ejector and GSC is from the main
steam with orifice plate
No steam ejector
No condensate Piping from Condenser Hotwell to
Deaerator Inlet.
No control valve in the recirculation piping line
because the condenser pump is VFD controled.
Water ejector is selected in our proposal.
The pipes are from hotwell to AQC boilers' hot
water stage,and then go to dearator.
The cooling water and DM water is not in the
scope.
Should be discuss during meeting.
Sinoma Energy Conservation Ltd.
25/04/2012 Rev 1
Project:My Home
Mechanical Deviation List
Page: 9 / 12
No ejector and LP heater in condensate piping line.
The condensate will be preheated in AQC boiler
hot water stage.
Conductivity(at 25℃) is <=30μs/cm
No water cooled membrance wall in waste heat
recovery boilers.
For AQC Boiler: the outlet headers of superheater
and economizer are arranged outside of boiler, but
the evaporators and inlet headers of superheater
and economizer of boiler are arranged inside the
Safety ruuning and sealing of boiler can be
boiler(in the flue gas path).
confirmed.
For SP Boiler: the outlet headers of superheater is
arranged outside, but the evaporators and inlet
headers of superheater are arranged inside the
boiler(in the flue gas path).
No blow down provisions with regulating valves in
this system.
No traps with valves in our system.
there is no sampling connections in steam drum.
The sampling point is on the steam/water pipes
No soot blower provision in WHRB economizer.
Sinoma Energy Conservation Ltd.
25/04/2012 Rev 1
Project:My Home
Mechanical Deviation List
Page: 10 / 12
CPH is only considered in AQC boilers. The feed
water of SP boiler is from AQC boiler.
The Casing sheet minimum thickness will be 5 mm
with 1mm corrosion allowance.
Internal liners are just designed for expansions in
AQC boiler inlet duct.
No soot removal arrangement in WHRBs. For AQC
boiler, de-dust chamber is installed in the bottom of
boiler, and for SP boiler, mechanism hammering
system is installed.
For AQC boiler, one common dosing system is set
for HP and LP steam stage.
Motorized control valve and Motorized stop valve
will be supplied. No bypass motorized valve in feed
water station.
No HP heater and LP heater in this system.
The condenser will be designed as per GB
standard.
The hotwell capacity will be 1min.
The oxygen content will be not exceed 0.05ppm
This should be as per manufacture.
Sinoma Energy Conservation Ltd.
25/04/2012 Rev 1
Project:My Home
Mechanical Deviation List
Page: 11 / 12
The capacity shall be so as to reach about 70%
vacuum in 30 minutes.
GB standard is adopted in cooler designed
No interior coating in the oil tank.
No overhead lube oil system in our proposal.
No gear box between turbine and generator.
b) Dissolved O2 in Deaerator water - 0.05 ppm
There is no LP dosing system.
The pumps shall be designed with 10% margin on
flow and 20% margin on head.
All pipes of size NB 50 & below shall be schedule
40 thickness for all applications except for SS
material
Should be discuss during meeting.
Metal expansion joints will be used in this proposal.
For the platforms, walkways and ladders for boilers
should be discussed during meeting.
Louver type dampers are used in PH boiler inlet
duct and bypass duct.
Louver type dampers are used in boiler inlet , outlet
and bypass duct.
If the diameter of duct is more than 3000mm, the
thickness is 8mm, otherwise the thickness is 6mm.
Sinoma Energy Conservation Ltd.
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Project:My Home
Mechanical Deviation List
Page: 12 / 12
If the diameter of duct is more than 3000mm, the
thickness is 8mm, otherwise the thickness is 6mm.
Guillotine damper is used in PH boiler outlet duct.
Sinoma Energy Conservation Ltd.
25/04/2012 Rev 1