How much clearance is required around sprinkler heads?

How much clearance is required around sprinkler heads?

As a general rule, NFPA 13, Installation of Sprinkler Systems, requires 18 inches of clearance, but makes the following modifications: For standard pendent and upright spray (SSP/SSU) sprinklers, the 18- inch dimension is not intended to limit the height of shelving or storage along a wall as illustrated below.

What is pendent type sprinkler?

HD Pendent Sprinkler is a small, thermosensitive, glass-bulb spray sprinkler available in several different finishes and temperature ratings to meet design requirements. During fire, the heat-sensitive liquid in the glass bulb expands, causing the glass bulb to shatter. …

What is the difference between upright and pendent sprinklers?

Standard spray, upright/pendent. Upright sprinklers are installed with deflectors above the sprinkler, while pendent sprinklers have deflectors below the sprinklers. Common industry practice is to use upright sprinklers in areas without finished ceilings and pendent sprinklers in areas with finished ceilings.

What is the minimum clearance required below a sprinkler head?

The minimum vertical clearance between sprinklers and material below shall be 18 inches (45.7cm).

What is the most common obstruction to sprinkler systems?

Calcium carbonate obstructions
Calcium carbonate obstructions are most common in sprinkler systems supplied from non-potable wells or surface water in places where water supplies are known to be hard. These blockages can’t be detected or corrected by normal flushing operations.

What is the 18 inch rule for sprinkler heads?

The purpose of the “18-inch rule” is to prevent storage or any other obstruction from interfering with the spray of water from a sprinkler head during a fire. It is intended to prevent a situation in which the obstruction is within 18-inches of the ceiling and might be between the sprinkler head and the fire.

What is the coverage area of a sprinkler?

Sprinkler Head Distance and Spacing Requirements

Hazard Level Coverage (in sq ft) per Sprinkler Head Maximum Allowed Distance Between Sprinkler Heads
Ordinary Hazard 1 & 2 (areas with moderate concentrations of flammable materials) 130 sq ft per head 15 ft

How do you clear a clogged sprinkler?


  1. First make sure to turn of the sprinkler system to avoid incidents.
  2. Next you will need to remove all of the sprinkler nozzles and heads.
  3. Then turn on the water and let it run until water flows from each head opening to let out any debris inside the sprinkler systems.
  4. Then turn the water off again.

Does OSHA require sprinkler systems?

More specifically, OSHA requires that sprinkler systems are both inspected and tested annually to ensure that they will work correctly in the event of a fire.

Are fire sprinklers required?

According to NFPA 13, all newly constructed commercial buildings that are 5,000 square feet or larger are required to have fire sprinkler systems. NFPA also states that any townhomes with more than two units per building require an automatic fire sprinkler system.

What kind of sprinkler system is concealed pendent?

Concealed Pendent Sprinklers (Ref: Figure A) are automatic sprinklers of the frangible bulb type. They are “standard/quick response – standard orifice spray sprinkler“ intended for use in fire sprinkler systems designed in accordance with the standard installation rules recognized by the applicable Listing

How big is a quick response fire sprinkler head?

Quick response fire sprinklers cool walls, ceilings, and surrounding air to give a building’s occupants a chance to escape and to delay flashover – a deadly chain reaction resulting in extreme heat and the loss of all oxygen in a room. Glass bulbs utilized in quick response fire sprinklers are 3mm in diameter.

What kind of pressure does a sprinkler head have?

not present Specifications *1 NV007 NV008 Min. Operating Pressure 7 psig / 0.048 MPa (0.48 bar) 7 psig / 0.048 MPa (0.48 bar) Sprinklers Finish Brass Chrome Plated Brass Chrome Plated Listings and Approvals UL (United States) UL (United States)

How big of an area can a sprinkler head cover?

Sprinklers can cover up to 225 square feet in light-hazard environments; up to 130 square feet in ordinary-hazard environments; and up to 100 square feet in extra-hazard environments. What is a pendent sprinkler head?