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Reg. 507, Reg. 508
STANDARD CONDITIONS FOR THE DESIGN AND CONSTRUCTION OF ECONOMISER, FEED PIPES, FEED HEATERS AND OTHER SIMILAR VESSELS

CAST IRON, TUBES AND HEADERS

Test bars

For all new economisers the hydraulic test must be applied as shown below:-

a) When the test bars are cast separately, they shall be poured at the same time and from the same ladle of metal as the casting or castings they represent. The number of test bars specified in Regulation 508 shall be applicable to all castings of each melt.
b) when the bars are cast on the mould for the castings and the mould for the test piece shall be joined together in such a manner that the liquid metal fills both moulds at the same operation.
c) all test bars shall be cast in green sand or in loam or dry sand moulds according as to whether the casting or castings they represent are moulded in green sand, or in loam or dry sand respectively.
d) The test bars shall not be subjected to any heat treatment after leaving the moulds except where the castings are heat-treated.



Reg. 508
STANDARD CONDITIONS FOR THE DESIGN AND CONSTRUCTION OF ECONOMISER, FEED PIPES, FEED HEATERS AND OTHER SIMILAR VESSELS

CAST IRON, TUBES AND HEADERS

Number of tensile tests
 

(a) The number of tests required for each batch of castings shall be in accordance with the following table the various classes of castings being divided into 4 representative groups:-

Group Weight of castings Test requirements
1. Up to 28 lbs One test for each 30 cwts. Of castings or part thereof.


One test for each 2 tons of castings or part thereof.

2. Over 28 lbs. and up to 1 cwt
3. Over 1 cwt. And up to 1 ton One test for each 3 tons of castings or part thereof.
 

In the above Group 1, 2 and 3, all castings represented by one test must be poured from the same ladle of same heat as the bar or bars provided for the test.

 

4. Over 1 ton and important castings One test for each 4 tons of castings or part thereof or for each casting weighing 4 tons or more.

(b) Conditions for Acceptance and for Rejection:-

Test Result Conclusion
1st Pass The batch or separate casting represented shall be accepted.
Tensile or Transverse test fails Two more tests shall be made.
2nd If both pass
If  either fails 
The batch or separate casting represented shall be accepted.
The batch or separate castings represented shall be rejected.

Provided always that, in the case of failure of any test piece showing obvious casting defects, another test piece shall be taken from spare test bars or cut from a casting from the same batch and the results obtained from this substituted for those obtained from the defective test bars.

 
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