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Reg. 59
MATERIALS OF CONSTRUCTION
 

(a) Flattening test.- (i) A section of the tube not less than 40 mm length shall be flattened cold between parallel plates.  No cracks or breaks in the metal shall occur until the distance between the plates is less than the given by the following formula.  Evidence of lamination or burnt material or incomplete penetration of the weld shall not develop during the testing.

                                         ( 1 + e ) t

                            H = ----------------

                                         e + ( t /D )

Where                    t  =  Specified thickness of tube (in mm)

                                D = Specified outside diameter of tube (in mm)

                                e = Flattening test constant as given below :

                                0.10 for tube grade WC 1

                                0.07 for tube grades WC2 & WC3.

(ii)           The weld shall be placed 90 degree from the line of direction of the applied force.

(iii)               Superficial rupture as a result of minor surface imperfections shall not be cause for rejection.

(iv)               Flattening test carried out in accordance with any other standard code may be accepted in which case the code adopted shall be specified.

(b) Flaring Test.- A section of tube of length equal to 1.5 times the outside diameter, but not less than 50 mm, shall stand being flared with a tool having 60 or 45 degree included angle until the tube at the mouth of the flare has expanded to the percentage given below without cracking

_________________________________________________________________________

Tube                                        % expansion in outside diameter D for a d/D of_______

Grade                                      0.6 and            Over 0.6 to             Over 0.8

                                                 under               0.8 including_____________________

WC 1                                          12                         15                         19

WC2                                           12                         15                         19

WC3                                           10                         12                         17

_________________________________________________________________

d = inside diameter of tube.

 

 
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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