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. 618, Reg. 619, Reg. 620
(Regulations made under clause (a) and (aa) of section 28 of the Act)

Small Industrial Boilers General

Reg 618

Scope

 
This Chapter shall apply to the design, construction, inspection, registration, operation and maintenance of small industrial boilers.

Reg. 619

Definition

In this Chapter, “Small Industrial Boiler" means:
a)
a shell type boiler generating stream for use external to itself under pressure upto 7 kg/cm2 and having a volumetric capacity exceeding 22.75 litres, but not exceeding 500 litres including the volumetric capacity of all pressure parts being heated from the same heating source and connected to the boiler; or
b) a coil type boiler or a once through boiler or a water tube boiler having the conditions specified in clause (a) above except that –
  (i) the limitation of pressure shall be 12 kg/cm2, and
  (ii) the capacity shall be not exceeding 150 litres.
 
Provided that in case of boilers having combined features of clauses (a) and (b), the working pressure shall be restricted to 7 kg/cm2 and the volumetric capacity of particular pressure parts shall not exceed the limits specified in the respective clauses above subject to an aggregate of 500 litres.



Reg. 620

Extent to which variation from the standard conditions laid down in the preceding Chapters is permissible.-



The following variations from the standard conditions laid down in the preceding Chapters shall be permitted, subject to the conditions specified below, with due regard to the safety of the boilers and personnel
.

1)
Materials:-
(a) The materials used in the construction of Small Industrial boilers shall, except as otherwise provided hereinafter, conform to the provisions made in Chapter II of these regulations.
(b) Steel plates used in the construction of the boilers shall be of IS: 2062 grade B or C or equivalent and the plate for shell and heads shall be not less than 6 mm. in thickness and the heads as tube sheets for tubes rolled in shall be at least 8 mm. in thickness.
(c)
(i)
Heads of parts of boilers when not exposed to direct impact of flame may be made of cast iron or malleable iron provided they comply with other requirements of these regulations.
 
(ii)
The allowable stress on cast iron or malleable iron shall be based on the tensile strength of material with a factor of safety of not less than 4.5.
2)   Design, construction, workmanship and the method of computing the maximum allowable working pressure:
(a)
(i)
The construction except where otherwise specified shall be the same as those prescribed in the relevant provisions of the preceding Chapters of these regulations.
 
(ii)
In the case of fusion welded boiler neither stress relieving nor radiography of welded joints is required.
(b)
(i)
In the Small Industrial boilers unflanged steel tube plate may be inserted into the shell and welded for the entire thickness as shown in Fig XIV/1 with a fillet weld having a throat not less than 11/4 times the thickness of the shell or tube sheet whichever is smaller.
 
(ii)
The minimum thickness of unflanged welded tube sheets shall be 10 mm.
    t1 = 2 times required thickness of a seamless shell but never less than 1.25 ts or greater than t.
 
  (iii) The temperature of the heating element of electrically heated steam boilers shall be so controlled that it shall not exceed 650° C.
(e)
(i)
The tubes shall be made of steel.
 
(ii)
The tube holes shall be drilled full size with shells butt straps and ends bolted up in position or may be punched at least 13 mm smaller in diameter than full size and then drilled, reamed or finished full size with a rotating cutter. The sharp-edges and chips removed, the plates and butt straps reassembled metal to metal with pins fittings the holes and with tack bolts.
(3)   Inspection and testing:-
           The Small Industrial Boilers shall be subjected to inspection during construction and after completion by an Inspecting Authority. The inspection of the boilers shall be made at the following stages:
A.
  Shell type Boilers:
 
(i)
Material identification and inspection.
 
(ii)
Inspection of each component after completing welding and drilling.
 
(iii)
Assembly of boiler.
 
(iv)
Hydraulic test:-
   
(a)
Every completed boiler of riveted construction shall be tested hydraulically at least twice the working pressure;
   
(b)
In case of a boiler wholly or partly welded construction, the hydraulic test pressure shall be equal to two times the maximum allowable working pressure of the boiler.
 
(v)
A test coupon shall be provided by the maker for conducting root and face bend tests.
B.
  Coil type Boilers, once through boilers and water tube boilers:
 
(i)
Identification of materials.
  (ii) Hydraulic test: The pressure for hydraulic test shall be two times that of the working pressure of the boiler.
(4)   Certificates and Maker’s Stamps.-
(a)   The certificate and maker’s stamp shall be in conformity with the provisions of Chapter I of these regulations.
(b)   If owing to small size of the boiler all information cannot be visibly stamped on the boiler plate, maker’s certificate accompanying the boiler shall contain the necessary details, but in all cases name, works number and the year of the make must be stamped or exhibited on the boiler.
 
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 Forms Home Search Help Contact Us