# Sprinkler system type explainer

Select the type recorded in your system documents. Read how the pipes and valve arrangement work. If the type is unknown, ask a qualified contractor to identify it. This tool does not choose a design.

Use the tool on the [web page](https://firesprinklers.fyi/tools/sprinkler-system-type-explainer). It works without JavaScript.

## How to use it

1. Choose type shown in your system records.
2. Read the result.

## How it works

QRFS, A Guide to Dry Sprinkler Systems, Part 1, fetched 2026-11-10: https://blog.qrfs.com/143-a-guide-to-dry-sprinkler-systems-part-1/ . It describes wet systems with water-filled piping, dry systems with pressurized gas and a dry valve, and pre-action systems using separate detection and an electrically operated valve.

The outputs explain the selected term. They do not infer a system from climate, building use or a photograph. Pre-action release arrangements vary. Confirm the installed arrangement and its sequence from the system documents and a qualified contractor.

This tool supplies no pressure, timing, installation or test settings. Do not operate valves, disable detection or change a design based on a result.

> Definitions for information only. This is not a design recommendation, a test procedure or fire code advice. Confirm the installed arrangement with a qualified contractor.

## Questions

### Does this tool tell me which system to install?

No. It explains a type you select from existing records. Have the designer and authority confirm a proposed system.

### Does a dry system have no water supply?

No. A valve separates the gas-filled piping from its water supply before operation. The system still needs the applicable supply and valve maintenance.