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7 Cards in this Set
- Front
- Back
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Preheating |
Heat parts before welding in special oven or furnace at 80-230* C |
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Post weld treatment |
Heating parts after welding has been completed .(590* C or above). N cooling slowly at controlled rate until temp drop to below 315* C |
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Riveted joints |
No longer used . 2 main types of riveted joints are Lap joint n butt joint . |
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Tapered mandrel |
Fits between the roller and when mandrel is turned the roller are rotated and forced out against the tube wall thus expanding tube against then tube hole |
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Boiler stay |
To support large flat surface to prevent it from bulging under pressure,of tube sheet waterleg and crown sheet of firetube boiler.and water boiler don't need stay bcs they dnt have large surface .type Diagonal ,longitudinal,staybolts. |
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Manhole size |
Elliptical manhole 12 in x 16 inch Circular manhole 15 inch dia. Hand hole 2.75 inch to 3.5 inch (70-89 mm) They shall be rolled forged or cast steel except pressure less then 250 psi and temp 450 df and made of cast iron. |
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Foundation n support required |
To avoid any movement to reduce induced stress on boiler and its connecting pipe work.strong concrete foundation is required .bottom n top supported . |
