twin inlet breeching

dry riser inlet box

horizontal landinggate valve

Dry Risers and Testing Facilities

Twin Inlet BreechingA twin inlet breeching is fitted with twoinstantaneous male connections withtwo non-return valves and a 25mmdrain valve.

Specification

• Twin pumping-in breeching to

BS 5041 Part 3

• Horizontal or vertical with 25mm

drain valve

• Inlets 2.5” male instantaneous to BS 336

with integral non-return valves and

complete with blank caps and chains

• Outlet flanged either 100mm BS 4504

PN 16 or 4” BS Table D

Design and SupplyDry risers are systems of valves andpipework which enable the FireBrigade to deliver water onto upperfloors of a building.

Generally, a dry riser system will berequired where any floor of a buildingis over eighteen metres above groundlevel.

Since dry riser systems are used by theFire Brigade, particular attention mustbe paid to the design of the system toensure the valves are correctly sited,with adequate space to enableefficient use of the equipment.

A typical dry riser system will comprisea vertical 100mm diameter pipe, witha twin inlet connection at street level,an outlet valve at each landing and anautomatic air release valve at thehighest point.

Four-way Inlet BreechingFour-way inlet breechings are used with a150mm diameter rising pipe which servestwo outlets on each floor. The breeching isfitted with four instantaneous maleconnections with four non-return valvesand a 25mm drain valve.

The connection onto the dry riser pipeworkis 150mm, usually flanged PN16 or BSTable D.

Air release valve

Landing outlet valve

Top floor

Landing outlet valve

First floor

Landing outlet valve

Ground floor

External wall

Steel cabinet withglazed door

2 Way inlet breeching25mm drain valve

Typical Arrangement of Dry Rising Main

Dry Riser Inlet Boxes

Generally, boxes will be of painted steelwith a door with a breakable glasspanel and cylinder lock. The dimensionsof the box must allow adequate spacearound the inlet breeching.

Specification

• Recessed dry riser inlet box to BS 5041

Part 5, 595 x 395 x 295mm deep, to suit

a dry riser inlet breeching

• Box, door and frame from zintec steel,

finished polyester powder paint red, with

230mm diameter hole through back for

inlet connection

• Door complete with wired glass panel

lettered ‘DRY RISER INLET’, lock and

hinges

• For vertical or horizontal mounting

Dry Riser Outlet Boxes

Outlet valves do not need to be housedin boxes. If boxes are used, they mustcomply with BS 5041 Part 4 and thedimensions must allow adequate spacearound the valve.

Landing Gate Valves

Provided at each floor level to enablethe Fire Brigade to make a connectionfor fighting fire on that floor level.

Specification

• Gate pattern landing outlet valve to

BS 5041 Part 2

• Outlet 65mm female instantaneous to

BS 336, complete with blank plug and

chain, padlock and strap and 150mm

diameter handwheel

• Inlet can be flanged either 65mm

BS 4504 PN16 or 2.5” BS Table D or

screwed 2.5” BSP female

Globe Valve variations are available asoblique pattern, Bib-nose pattern orRight-angle pattern.

Dry Riser TestingDry riser systems should be tested toBS 5306 after installation andannually thereafter.

The test procedure involves a fullpressure water flow which simulatesthe actions that would be taken bythe Fire Brigade in an emergencysituation. The test results providevital evidence that the dry risersystem would be fully functional inan emergency. If any defects arefound these can be promptlycorrected after consultation with theperson responsible for the building’sfire safety.

In line with our policy of continualdevelopment and improvement of products,we reserve the right to upgrade and amendproduct specification without prior notice.

Kidde Fire Protection Services400 Dallow RoadLutonBedfordshire LU1 1UR UK

Tel +44 (0) 1582 413694Fax +44 (0) 1582 402339email kiddefps@kiddefps.comwww.kiddefps.com

KFPS/DRYRISER/0303