PRINCIPLES OF NAVAL ENGINEERING 



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.'IAN UAL 

 RIMING 

 BOWL 



FIRE PUMP 



EXHAUST OUTLET 



3.164 



Figure 4-6.— P- 250 portable pump. 



into the compartment. His repair work is likely 

 to be hampered by tangled wreckage in the water, 

 by the absence of light to work by, and by the 

 difficulties of trying to keep buoyant repair 

 materials submerged. 



Shoring is often used aboard ship to support 

 ruptured decks, to strengthen weakened bulk- 

 heads and decks, to build up temporary decks 

 and bulkheads against the sea, to support hatches 

 and doors, and to provide support for equip- 

 ment which has broken loose. 



The basic materials required for shoring 

 are shores, wedges, sholes, and strongbacks. 

 A shore is a portable beam. A wedge is a block, 



triangular on the sides and rectangular on the 

 butt end. A shole is a flat block which may be 

 placed under the end of a shore for the purpose 

 of distributing the pressure. A strongback is a 

 piece used to distribute pressure or to serve 

 as an anchor for a patch. 



When to shore is a problem that cannot be 

 solved by the application of any one set of rules. 

 Sometimes the need for shoring is obvious, as 

 in the case of damaged hatches; but sometimes 

 dangerously weakened supports under guns or 

 machinery may not be so readily noticed. Al- 

 though shoring is sometimes done when it is 

 not really necessary, the best general rule to 



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