Message from
Chairman of Central Boilers Board


About Central Boilers
Board


History of Indian Boiler Regulations

Foreword

Contents Chapter
Wise


Contents Regulation
Wise


List of Amendments

Indian Boilers
Act 1923


Ibr Forms

Home

Search

Help

Contact Us

 

Reg. 626

FEED WATER FOR BOILER


Test Methods

  Tests shall be carried out as prescribed in the appropriate clauses of IS : 3025-1964* and IS : 3550-1965! as indicated against the characteristics in Table 1.

TABLE 1: CHEMICAL REQUIREMENTS OF FEED WATER AND BOILER WATER FOR LOW AND MEDIUM PRESSURE BOILERS (Regulation 624 and 626)
Sl.. No. CHARACTERISTIC
REQUIREMENT FOR BOILER PRESSURE
----------------------------------------
METHOD OF TEST (Ref. to Cl. No. of)
--------------------------
   
Up to 2.0
2.1 to 3.9
4.0 to 5.9
IS : 3550-
IS : 3025-_
   
MN/m2
MN/m2
MN/m2
1965*
1964!
(1)
(2)
(3)
(4)
(5)
(6)
(7)
i)
Feed Water    
  a)
Total hardness
(as CaCO2 ),mg/l, Max
10
1.0
0.5
--
16.1
-----------------------------------------------------------------------------------------------------------------------
(1)
(2)
(3)
(4)
(5)
(6)
(7)
  b) pH value
8.5 to 9.5
8.5 to 9.5
8.5 to 9.5
--
8
  c) Dissolved Oxygen, mg/1, Max
0.1
0.02
0.01
25
--
  d) Silica (as SiO2), mg/l, Max
--
5
0.5
16
--
ii)
Boiler Water          
  a) Total hardness(of filteredsample) (as CaCO3), mg/l,
--------- Not detectable -------------
--
16.1
  b

Total alkalinitya (as CaCO3), mg/l,Max

700
500
300
--
13
  c) Caustic alkalinity (as CaCO3), mg/lMax
350
200
60
--
15
  d) pH value
11.0 to 12.0
11.0 to 12.0
10.5 to 11.0
--
8
  e) b Residual sodi um sulphite (asNa2SO3) mg/l
30 to 50
20 to 30
--
--
21
  f) Residual hydrazine (as N2H4),mg/l
0.1 to 1
(if added)
0 .1 to 0.5
(if added)
0.05 to 0.3
26
--
  g) j Ratio Na2SO4/Caustic alkalinity (as NaOH)
               or
Ratio NaNO3/ total alkalinity (as NaOH)
------------ above 2.5 ---------------
--
20.2
and 15
------------- above 0.4 ----------------
--
48
and 13
  h) Phosphates (asPO4), mg/l (if added )

20 to 40
15 to 30
5 to 20
14
--
  i) Total dissoslved solids mg/l, Max
3500s
2500
1500
9
12
  k) Silica (as SiO2), mg/l
Less than 0.4 of caustic
alkalinity
15
16
30
------------------------------------------------------------------------------------------------------------------------

Note 1- Recovery Boilers - The boiler feed water used shall be completely de-mineralized and also the boiler feed water and boiler water shall be conditioned in accordance with high pressure boilers working at 60 kg/cm2 and above (see IS : 4343-1967**)

Note 2 - When feed water heaters are of copper or copper alloy constructions, the pH of the feed water shall be maintained between 8.5 and 9.2 while when feed water heaters are of iron constructions, the pH of the feed may be maintained between 8.5 and 9.5.

Note 3 - Silica in Boiler Water - Lower concentration of silica may be advisable for steam of turbines, which generally requires less than 0.02 mg/l silica in steam.

  * Methods of test for routine control for water used in industry.

! Methods of sampling and test (physical and chemical) for water used in industry.

a Total alkalinity should preferably be about 20 percent of total dissolved solids.

b Shall not apply if reducing agents other than sodium sulphite are used.

j For riveted boilers only.

s For shell type boilers depending on parameters, the limits can be relaxed.

** Code of practice for treatment of water for high pressure boilers (under revision).

 
Back   Top
Message from Chairman of Central Boilers Board About Central Boiler Board History of Indian Boiler Regulations Foreword Contents Chapter Wise Contents Regulation Wise List of Amendments
Indian Boilers Act 1923 Ibr FormsHomeSearchHelp Contact Us