| MSHA's Accident Prevention Program
Compatible Threads on Fire Hoses
| Several years ago, a small fire occurred in an underground coal mine. A team of miners approached the fire from upwind and when they got close enough to put water on the fire, they tried to attach the fire hose to the standpipe only to find that the NPT (National Pipe Thread) threads on the standpipe did not match the Higby cut NH (National Hose) threads on the fire hose. Fortunately, the fire|
was extinguished using another hose and rock dust. An investigation revealed that when the fire hoses were ordered, they failed to ensure that they were compatible with the mine's standpipes.
The following guidelines should be followed to prevent the reoccurrence of this situation.