What is the purpose of a standpipe?
How are Standpipes Fed Water?
- Wet System. It has constant water and consistent water pressure. ...
- Manual Dry Systems. The pipes in this system contain no water or air. ...
- Automatic Dry Standpipes. They are filled with water to maintain constant pressure. ...
- Semi-Automatic Dry Standpipe. This system stores pressurized or unpressurized air in the pipes. ...
How to plumb for a standpipe?
Tool for the Job
- Solvent glue
- Reciprocating saw
- 2-inch standpipe
- Utility knife
- Primer How to Install a Washing Standpipe This is an easy do-it-yourself installation process, and you can complete the job in a few hours.
- Find a drainpipe near the location of the washing machine and use the reciprocating saw to cut through the drainpipe. ...
What is a Class 1 standpipe?
When are Standpipes Required?
- Height – Section 905.3.1. Class I standpipe is allowed in sprinklered buildings. ...
- Group A – Section 905.3.2. Class I automatic dry and semi-automatic dry standpipe or manual wet standpipe are allowed in non-high-rise buildings.
- Covered and open malls – Section 905.3.3. ...
- Stages – Section 905.3.4. ...
- Underground buildings – Section 905.3.5
Can a dishwasher discharge into a standpipe?
With most dishwashers, the water that has finished cleaning up your dishes will be sent right into the plumbing system. The drainage typically works well, but in some cases, you may see backflow. When backflow occurs, it’s due to a lack of airflow in the piping.
What is standpipe system?
by Kyle Nunes. Standpipe systems are a series of pipes which connect a water supply to hose connections, basically an extension of the fire hydrant system. They are designed to provide a pre-piped water system for building occupants or the fire department.
How often is a standpipe inspection required?
All standpipe systems are required to be maintained in compliance with NFPA 25. The standard requires a weekly/monthly inspection of the control valves. A quarterly inspection of the pressure regulating devices, piping, and hose connections is required.
What is a class 1 standpipe?
Class I – A Class I standpipe system shall provide a 2 1/2 inch hose connection for use primarily by trained personnel or by the fire department during initial response. This class has no hose attached. The fire department will usually carry hose packs to the floor level, typically a stairwell, where they will start their operations and connect to the standpipe system. These connections must match the hose thread utilized by the fire department.
How often should I test my standpipe?
The standpipe system shall have a hydrostatic test, flow test, and main drain test every 5 years. The hydrostatic test is at 200 psi for 2 hours, or 50 psi in excess of the maximum working pressure.
Where do fire departments carry hoses?
The fire department will usually carry hose packs to the floor level, typically a stairwell, where they will start their operations and connect to the standpipe system. These connections must match the hose thread utilized by the fire department.
Do older buildings have standpipes?
Some older buildings only have standpipe systems while many newer buildings will have a combination system, which supplies the fire sprinkler system and the standpipe system. They are most common in large floor area buildings, where most of the facility may be some distance from an outside entrance, and in multistory buildings to prevent long ...

Types of Standpipe Systems
- Standpipe systems can be either simple or intricate, and installed either horizontally or, most commonly, vertically. There are four different types of standpipe systems used in fire protection – wet system standpipes, automatic dry standpipes, semi-automatic dry standpipes, and manual dry standpipes. Here is how each differs: 1. Wet System Standpi...
Classes of Standpipe Systems
- There are three classes of standpipe systems – Class I, Class II, and Class III. 1. Class I: A Class I standpipe system is designed to be used by firefighting personnel only and is most commonly found in a stairwell, in a cabinet in the hallway, or standing alone by an I-beam in an open area. It features a 2½-inch hose connection with no hose attached. The fire department carries their hos…
Understanding NFPA 25 Compliance
- All standpipe systems are required to follow NFPA 25 compliance guidelines. This standard requires the standpipe’s control valves to be inspected weekly or monthly depending on certain variables. It also requires a quarterly inspection of the pressure regulating devices, piping, and hose connections. Once a year, the system’s cabinet, hose, and hose storage device are require…
Stay Compliant – Schedule Your Standpipe System Inspection Today
- Metro Fire Inspections is a licensed and insured full-service fire sprinkler systems company serving New York City, and Westchester, Nassau, and Suffolk counties. We provide consultation and system design services, installations, inspections, as well as service and maintenance that meets or exceeds all National Fire Protection Association (NFPA) codes and standards. If you n…