Same material to be used

1. No repair to any boiler or steam pipe nor any of the connections thereto may be approved which is made in whole or in part of unsuitable material or is unsafe from any cause. Nothing herein may be construed to prevent the use of any boiler constructed of riveted iron or steel plates when the inspector has satisfactory evidence that such boiler or steam generator is equal in strength to and as safe from explosion as boilers constructed of the best quality of materials. 2. Quality of the material used in boiler construction and repair demands critical attention because in performing its function a steam boiler is continually subjected to disruptive stresses. These are due to high internal pressures and to changes in temperature. Disastrous consequences will inevitably follow if the material fails under these stresses. 3. The quality of the material used in the different parts of a boiler should be selected with special reference to the stresses and disruptive influences which each part encounters in service. 4. Galvanized pipe may not be used on any boiler or boiler system subject to this article, as this may cause deterioration of the boiler. 5. Sweated or soldered copper joints may not be used in steam piping and connections. 6. Repair material having a lesser tensile strength than that used in the original construction may not be used.