5.STEAM & WATER ANALYSIS SYSTEM (SWAS)

5.00.00  STEAM & WATER ANALYSIS SYSTEM (SWAS)    

 

5.01.00  A  SWAS   room shall be  provided to house  the sample coolers  and  anlyser racks  for  the steam and water  analyser  system.   The  system shall be designed  in accordance to the  recommendation of ASME PTC 19.11

         Part-II, water &  steam in  power  cycle.    

 

5.02.00  The SWAS system shall be  supplied as a composite system

 

         including sample piping, valves, grab sample  collection

 

         facility,  gauge/indicators,  coolers, chillers  and  on

 

         line analysers.

 

5.03.00  Primary cooler racks are located out side the SWAS room.  

 

         Primary coolers  shall  bring down the sample temp. to  50

 

         Deg.C (Approx). Secondary coolers shall bring down, the     

        

         temp. to  approx. Cooling Water Temp.+ 3 Deg.C. 

 

         However sizing of cooler  shall consider total flow plus 500

 

         ml/Min grab sample & fouling factor of 0.2 & inlet cooling

 

    water temp 33 Deg c and pressure of CW shall be 3 kg/cm2.

 

         The cooler shall be protected by safety relief valve.

 

5.04.00  Sample conditioning panel(Wet panel) housing

 

         secondary coolers, bulkhead fitting, pressure regulating

 

         valves,  grab sample flow rate control, flow  indicator,

 

         pressure  and  temp.gauges, cells and analysers  of  PH,

 

         conductivity, cation column etc.

 

5.05.00  Analyser  panel  (Dry panel) housing all  display  units

 

         (Digital  panel meters for PH &  conductivity   signals)

 

         analysers for sodium, phosphate, hydrazine, silica  etc.

 

         and  annunciation  system.  Further, two 4-20  mA  isolated

 

         analog  signal  for  each  measurement  including  PH  &

 

         conductivity  shall  be fed to DDCMIS  for  monitoring.

 

         Necessary  signal  distributors, if  required  shall  be

 

Provided .

 

5.06.0          Sample Piping System

a)    All process connection , piping, valve etc of SWAS analysers shall be  conform to ANSI/ISA SP 77.70- 1994 (R 2005) “Fossil Fuel Power Plant Instrument  Piping Installation”, ANSI B 31.1 “Power Piping”, PTC 19.11.1997,& IBR.

b)    All sample piping shall be three fourth inch NB seamless type  of material ASTM A213 TP 316H, conforming to ANSI

   B 36.19.

c)    All fitting shall be socket welding type and of material ASTMA 182 F316 H conforming to ANSI B 16.11.

d)    Single and multi tubes shall run with the  minimum No. of changes in direction.  Suitable  identification tags shall be provided for easy check up and for  proper connections.

e)    The valves to be used in sample piping shall be  of globe type, forged construction and  stainless steel conforming to ASTM  A182. The  pressure Temp. ratings shall be as per ANSI B 16.34.  The valve design shall be  such that  the  seats can be  reconditioned  and stem and  disc can be  replaced without  removing valve body from the line. Blow down valve shall be gradual open type.

f) All samples shall be passed through cartridge type filter  

   before Secondary cooler. 

 

5.07.00  The  exact  sample  points,  their  location,  type   of

 

         chemical  analysis  to be carried out for  each  sample,

 

         measurement  ranges  etc.  shall  be   subject  to   the

 

         approval of the owner.

 

5.08.00  Following analytical measurement  have been envisaged not   

         limited to -              

        

5.08.01  D M  Make-up to Condenser

 

      i) Specific Conductivity

     ii) Cat Conductivity

    iii) Silica

 

5.08.02  Hotwell

 

      i) Conductivity (insertion type)on both side

 

5.08.03       Cond. Pump Discharge

 

      i) Cat Conductivity

     ii) PH

    iii) Disolved  Oxygen

     iv) Specific Conductivity

      v) Silica

     vi) Sodium 

 

5.08.04  Condenser Cooling Water

 

      i) PH

     ii) Specific Conductivity

 

5.08.05  Deaerator Inlet

 

     i)  PH

     ii) Disolved  Oxygen

    iii) Specific Conductivity

        

5.05.06       Deaerator Outlet

 

     i)  Disolved  Oxygen

  

5.08.07  Feed Water at ECO  I/L

 

      i) Hydrazine

     ii) Specific  Conductivity

    iii) Phosphate

 

     iv) PH

a)       Disolved  Oxygen

 

5.08.08 Drum  Water

 

      i) Specific Conductivity

     ii) PH

    iii) Sodium

     iv) Silica

 

5.08.09  Saturated Steam (SH out)

 

      i) Specific  Conductivity

     ii) Cat  Conductivity

    iii) PH

 

5.08.10  Main Steam

 

      i) Specific  Conductivity

     ii) PH  

    iii) Silica

 

5.08.11  HRH Steam

      i) Specific  Conductivity

     ii) PH  

 

5.08.12  CBD – Phosphate

 

5.08.13  Any other Analyzer recommended by Boiler/ Turbine

 

Manufacture or pollution board.

 

5.09.00  All the analysers/ cells shall have -

 

(A)       a) Open Corrosion resistant drain to waste header.

 

b) Automatic Temp. compensation shall be provided. The  

   protection class of all analysers shall be IP- 65 &  

   operating Temp range shall be 0- 50 deg C.

        

(B)                 All chemical re-agents and required.

 

        for 12 months operation is to be supplied.

 

 (C)     Analysers/  Monitors/  Cells  shall  be  suitable   for

 

         operating  under the conditions specified.

 

(C)                 The Analyzer  supplies shall indicate the  preparation

 

        procedure/ formula of Regent to be used in Analyzer’s

 

        System.

 

(E)              Bidder shall submit cooler sizing, calculation, PID diagrams

 

       etc. of SWAS system for approval during detail Engineering.

 

(F)              Any Analyzer required inlet sample Temp. less than CW inlet Temp. + 3 Deg.C., the required chiller unit & cooler shall be In the bidder’s scope. The chiller unit and pump shall

       be 100% redundant. 

 

(G)              Bidder shall provide startup kit for Analyzers, Buffer

       solution for PH, Conductivity simulator etc.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

                                                                                                                                                 TABLE -  5.1

 

          SPECIFICATION   OF  SWAS   ANALYZER

 

 

 

S. No.	REQUIRE    MENT	HYDRAZINE	SILICA	SODIUM	DISSOLVED OXYGEN	CONDUCTI-VITY	PH	PHOSPHATE	CHLORIDE
1.	Type	Continuous  electro–chemical	Continuous colorimetric	Continuous	Continuous	Flow through	Flow through	Clorometric	Continuous flow through
2.	Accuracy	± 5%	± 5%	± 10%	± 5%	± 1%	± 1%	± 5%	± 5%
3.	Response time	£ 1 min	£ 10 min (for multi stream )	2 min	< 30 Sec	1 Sec.	-	£ 10 Min	< 15 Min
4.	No.of streams	Single	Multi – stream	Multi stream	Single	Single	Single	Single	Single