![]() ![]() These hoses connected to fire plugs with couplings made by local blacksmiths. Instead of hydrants, they used fire plugs, and their hoses were made of leather and rivets. Why are there different thread types and sizes?Īfter the development of hand-operated pumps in the 1700s, the city of Philadelphia crafted wooden water mains to make water more accessible to people fighting fires. Hermaphroditic connections: devices that feature both male and female threads.Coupling: a fitting with female threading on both ends that joins two male fittings together.Nipple: a device with male threading at both ends.Some other terms widely used with fire hose and fire department connection (FDC) threads include: The inside diameter of the female end (ID or IDF) measures the diameter of the pipe within the walls. The outside diameter of the male end (OD or ODM) is the diameter of that fitting at its widest point (including the threads themselves). When the thread types of two items match, they “mate,” which just means that the two items fit together functionally. When referring to threads, devices are often described as “male” or “female” and compatible items “mate.” The female item has internal threads, while a male item has external threads. Thread pitch denotes the amount of space between threads in millimeters. TPI comes from the number of threads per inch on nozzles, hoses, and fittings. Thread size refers to threads per inch (TPI) and thread pitch. How do fire hose and fire department connection threads differ from one another? ![]() If you already know what thread you need, feel free to jump on over and check out our full range of fire department connections, plugs and caps, fire hose, and fire hose adapters. We’ll look at the history of threads used in fire protection, learn what standards prevail today, and show you what solutions are available if your fire department connection threads don’t fit local fire hose. In this article, we dive into thread standards and thread sizing. Thread size, gender, and the materials used to construct a coupling can and do vary from city to city. ![]() If firefighters can’t quickly connect a fire hose to other devices - pumps, hydrants, or the inlets to supplement or supply water to a building’s fire sprinkler or standpipe system - lives may be needlessly lost or property unnecessarily damaged.īut there’s more to the threads used with fire department connections (FDCs) and fire hoses than meets the eye. When a fire breaks out, time is in short supply. There is often some processing time before a refund is posted.While NST prevails as the go-to thread standard for fire hose and fire department connections, historically-rooted differences remain Then contact your credit card company, it may take some time before your refund is officially posted. Late or missing refunds (if applicable) If you haven’t received a refund yet, first check your bank account again. If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days. We will also notify you of the approval or rejection of your refund. Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. Any item that is returned more than 30 days after delivery There are certain situations where only partial refunds are granted: Any item not in its original condition, is damaged or missing parts for reasons not due to our error. Please do not send your purchase back to the manufacturer. To complete your return, we require a receipt or proof of purchase. We do not accept products that are intimate or sanitary goods, hazardous materials, or flammable liquids or gases. Several types of goods are exempt from being returned. It must also be in the original packaging. To be eligible for a return, your item must be unused and in the same condition that you received it. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange. ![]()
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