Material composition is also a factor — aluminum, brass, copper, plastic, iron, galvanized, etc. In fire fighting, coupling devices are mainly aluminum or brass.
Plastic is not common but can be used selectively. Galvanized and iron should be avoided due to the rusting factor. Typically, copper is not used in firefighting systems. When talking threads, you will encounter numerous types or systems. Forestry applications typically use NPSH or quarter turn quick connect fittings.
The role of threads for fire hose and hydrant couplings plays a critical part in fire fittings connections, so firefighters need to spend more time understanding the basics of threads, i. To begin with, thread size of fittings, nozzles , or hoses means the number of threads per inch TPI on them and thread pitch, which refers to the distance between threads pitch in millimeters.
In addition, several other acronyms used with fire hose and fire department connection FDC are worthy of special mention, which include:. Nipple: a fitting with male threads at both ends for connecting other fittings. Hermaphroditic connectors: a connector with mating surfaces having both male and female aspects. After the s when hand-operated pumps were commonly used, the city of Philadelphia invented wooden water mains to deliver water easier for people who were fighting fires.
Fire plugs, rather than hydrants commonly seen today, were used back then with hoses made of leather and rivets. Couplings made by local blacksmiths connected these leather hoses to fire plugs without thread standards being set in a uniform manner. Suhong Riemland Explainer. What is a Npsm thread? Wenlong Stroud Explainer. What size are fire hydrant connections? A standard fire hydrant has two 2.
The hose connection nozzle, compared to the pumper connection nozzle, has a lower discharge pressure and can be used directly to fight fires. Doralina Canelles Explainer. What is NPS thread? Tanika Llull Pundit.
What is standard hose thread size? What type of thread is PVC? Xueqin Freeth Pundit. What is FHT thread? Syble Scholzke Pundit. What is Thread type? Thread Types. A thread is a ridge of uniform section in the form of a helix on the internal or external surface of a cylinder IFI description or it could be described as a sloping plane curled around a cylinder. Internal threads are on nuts. There are many forms of threads but two types are in common use on fasteners. Patricia Ochsenreiter Pundit.
What is fire hose thread called?
0コメント