What is a return bend?

Definition of return bend

: a bend (as in a pipe fitting) that alters the direction of its center line 180 degrees.

What is a return bend in a sprinkler system?

A return bend is the piping arrangement for pendent sprinklers where piping stems from the top of the branch pipe (riser nipple), runs horizontally (arm over), and then down to the sprinkler (drop). Components of a return bend in a fire sprinkler system.

What is an Armover sprinkler?

An armover is defined in Section 3.5. 3 as a horizontal pipe that extends from a branch line to a single sprinkler or a sprinkler above and below a ceiling. There is no limitation on the length of the arm-over. Thus, an armover is defined differently from a branch line; it is not part of Section 9.3.

What are the different types of fire sprinkler heads?

There are 4 common varieties of fire sprinkler heads: pendent, upright, sidewall & concealed - each with their own particular use.

What are the 4 types of sprinkler systems?

Types of sprinkler systems permissible by NFPA 13, Standard for the Installation of Sprinkler Systems, are wet, dry, preaction, and deluge.

RETURN TO SENDER/BEND OVER SPELL/WARNING!

What is the color code for sprinkler heads?

The liquid in the sprinkler head comes in a variety of colors, which indicates the temperature required to activate the head: Orange – 135° F. Red – 155° F. Yellow – 174° F.

What is a bend in a pipe called?

Miter bends

A Miter bend is a bend that is made by cutting pipe ends at an angle and joining the pipe ends. A true miter bend is a 90-degree bend made by cutting two pipes at 45 degrees and joining them by welding. Similarly, three pipes cut at 22.5 degrees will give a 90 degree miter bend. miter bend.

What is the purpose of 90 degrees bend?

The main application area of an elbow (90 degree) is to connect hoses to valves, water pressure pumps, and deck drains. These elbows can be made from tough nylon material or NPT thread.

Why do pipes have bends?

In industrial piping systems, bends are mainly used because of their flexibility, which allows for the accommodation of thermal expansions and the absorption of other externally-induced loads on the piping system.

How close can a hanger be to a sprinkler head?

The distance between a hanger and the centerline of an upright sprinkler shall not be less than 3 in. (75 mm).

Can you bend fire sprinkler pipe?

PEX tubing must be protected from fire similarly to CPVC pipe. The tubing cannot be exposed and must have a layer of gypsum wallboard, plywood or lay-in ceiling tiles protecting the tubing. The PEX tubing is flexible and can be bent when installing the tubing. Fittings also can be used to make changes in direction.

How do you hide fire sprinkler pipes?

If not entire Wall paneling, home owners can get a box designed to hide the pipes and fittings. These boxes or Wall paneling can be used hide your electrical wires and fittings. You can create an ambience by having indirect lights or spot lights installed in these boxes on wall panels too.

How many bends are allowed in conduit?

No section of conduit shall contain more than two 90-degree bends, or equivalent between pull points. For conduits with an internal diameter of 2 inches or less, the inside radius of a bend in conduit shall be at least 6 times the internal diameter.

What is a 45 degree bend?

The Bend 45 is a Silent Plus SWR pipe fitting connecting two sewage pipes or pipes with fittings in the plumbing system. It is a connection fitting with a specific degree of diversion that directs the flow of discharge water between two pipes/fittings at a 45-degree angle.

What are the 4 types of bends?

Most tubes, though, are bent one of four ways: ram-type bending, roll bending, compression bending, or rotary draw bending.

What are the different types of bends?

What are the basic bends?

There are three basic bends that are commonly used: the 90° bend, the common offset, and the saddle. A more advanced type of bend called a concentric bend is discussed in a separate article.

What temperature does a sprinkler go off at?

What DOES Set Off Fire Sprinklers? Fire sprinkler systems are actually quite sophisticated, and are designed to be heat sensitive so that sprinklers only activate when the temperatures rise to fire-induced temps, usually somewhere between 155 to 165 degrees Fahrenheit.

Do sprinkler pipes have to be red?

Color Coding

Exposed standpipes and sprinkler risers must be painted red; this color-coding must be certified (BC 903.6). All buildings must comply. Branch piping does not require color-coded painting.

What temperature does a sprinkler head pop at?

An automatic sprinkler is typically activated when the temperature reaches within the range of 135-165 degrees Fahrenheit, saturating the fire below it. Sprinkler heads have a small glass plug containing a glycerin-based, colored liquid that expands with temperature.

What is the most common type of sprinkler system?

Wet pipe systems are the most common type of fire sprinkler systems. These systems are filled with water from an automatic source, and when a sprinkler head is exposed to enough heat, the heat-sensitive element will release and water will be allowed to flow from that sprinkler.

What is a dry sprinkler?

Dry Pipe Sprinklers

Dry pipe sprinkler systems are filled with pressurized air or nitrogen instead of water to prevent frozen and burst sprinkler pipes in areas with colder temperatures. The pressurized air in the sprinkler pipes prevents water from entering the pipes.

What is a standpipe system?

Standpipe systems are installed in buildings to help firefighters deploy attack hose lines quickly and with adequate water pressure and volume. They may be designed for heavy stream applications, first aid fire appliances, or have features of both.