Setting up a standpipe depends heavily on your intended use—whether you are dealing with plumbing/drainage or firefighting/hydrants. Below are the step-by-step instructions for the three most common applications.
Following are four types of standpipes that you will find in use:
A standpipe is a free standing pipe which is fitted with a tap. You can easily attach this to a hydrant to get a water supply where there is no running water supply. A standpipe is a means of connecting to our water distribution network for a temporary water supply.
Standpipe systems consist of piping and hose connections installed throughout a building to provide reliable water for the manual suppression of a fire by either the fire department or trained personnel.
A laundry standpipe is a vertical pipe that connects your washing machine's drain hose to your home's waste stack.
The standpipe for the clothes washer must be trapped. The standpipe height should be at least 18 inches (457 mm) and no more than 42 inches above the trap weir.
Class I standpipe hose connections shall be provided in all of the following locations:
A standpipe is a vertical metal pipe built into multi-story buildings or large structures that acts like a built-in fire hydrant. It typically consists of a bright red or unpainted steel pipe, an outlet valve with a hand-wheel to control water flow, and a threaded hose connection.
Plumbing codes require a standpipe to be between 18 and 30 inches in height to ensure proper drainage without overflowing. A vent must be installed near the standpipe to prevent airlock and slow drainage. The P- trap below the standpipe plays a crucial role in preventing sewer gases from escaping into the laundry area.
Location of standpipes
NFPA 14 requires that Class I and III standpipe hose connections be found at the main floor landing of exit stairways, along exit routes, both sides of fire doors. Hose connections on standpipes also cannot be blocked by stairway doors, when open or closed positions.
Using the standpipe:
Screw the threaded collar to the base of the standpipe, then lower the standpipe into the hydrant. As a safety precaution, keep your head and body clear of the standpipe while you screw the standpipe in a clockwise direction making sure it is secured into position.
The property owner is responsible for all standpipe maintenance and NFPA 25 inspections. Hiring a certified fire protection company ensures compliance.
Annual standpipe rental is payable in advance. Monthly and daily rental is invoiced retrospectively. All standpipes are fitted with a backflow prevention device in the form of a BS6282 double check valve. Water from a standpipe should not be consumed or used in food preparation.
The automatic wet standpipe system is the most common type of standpipe system. It contains a permanently attached water supply filled with water under pressure, making it instantly ready for firefighters to use simply by opening a valve.
Using an unlicensed standpipe on a public hydrant is illegal and may result in prosecution and fines of up to £1,000.
The primary purpose of a standpipe is to provide a reliable, pre-piped water delivery system for fighting fires in large or multistory buildings. Acting essentially as an extension of an outside fire hydrant, it allows firefighters to easily connect hoses on any floor without dragging long lines up stairwells.
The minimum pressure while flowing the required standpipe flow (500 GPM from the hydraulically most remote standpipe and 250 GPM from each additional standpipe, up to a maximum of 1000 GPM for a fully sprinklered building) shall be 100 psi at any valve outlet while flowing 250 GPM through each valve.
In plumbing, the "135-degree rule" is a code standard that dictates how much a horizontal drain pipe can bend or change direction. It limits the total cumulative angle of pipe fittings before a system requires an access point (cleanout) or must be vented, ensuring proper flow and preventing chronic clogs.
Yes, a shower, sink, and toilet can absolutely share the same vent, often referred to as a "wet vent" configuration. This setup—where the sink drain also acts as the vent for the toilet and shower—is highly efficient and saves space, but it must strictly follow specific plumbing codes regarding sizing, slope, and distance.
A Class I system is typically required in buildings that have more than three stories above or below grade because of the time and difficulty involved in laying hose from fire apparatus directly to remote floors. For these reasons, Class I standpipes are the required system in high-rise buildings.
Basic Components of Standpipe Systems. While each system can vary, a standpipe generally consists of an interconnected series of pipe, pumps, valves, alarms, drains, and fire department connections.
The standpipe shall be sized to provide the required flow and pressure (500 GPM for the most hydraulically remote standpipe and 250 GPM for each additional standpipe while supplying a minimum 100 psi at the hose valves outlets) with the maximum pressure of 150 psi supplied at the FDC inlets by the Fire Department.
The minimum height for a standpipe depends on the specific system being installed.
These classes of standpipe systems in 780 CMR are consistent with NFPA 14 Standard for the Installation of Standpipe & Hose Systems, the reference standard applicable to the design and installation of standpipes.
A plumbing vent pipe should run vertically inside a wall and exit through the roof. It must terminate at least 6 inches above the roofline (24 inches in snowy climates) and be located at least 3 feet away from any windows, doors, or air intakes.