references for hose/stairwell measurement

[xan]

I can't find it (lost it somewhere )so please help me if you can:
somewhere in a BS there is a reference for calculating the length of hose needed to go up a stairwell,which i believe is quoted as 150% of the floor height.

[kurnal]

Hi Xan
You will find it in BS5588 part 10 para 7.6.2.  Not sure if it appears anywhere else. In this context it refers to dry mains in shopping centres where a firefighting lift is not provided.

[xan]

many thanks,could not see the wood for the trees.

[Tom Sutton]

xan I would tread that rule of thumb with a lot of caution. Standard stair going 250/280mm and riser 150/170mm 12/16 steps I would think its more like 200%.

[CivvyFSO]

Quite right Tom.

For any doubters, working from the rise/going given by Tom: Taking the worst configuration of the longest going and the lowest rise gives you a triangle of 280 across & 150 up, and this gives you a hypotenuse of 317, so for every 150mm you go up, you need 317mm. (211%.)

[kurnal]

What happened to letting it hang vertically in the well with the added security of a rolling hitch?

[Tom Sutton]

Kurnal I need to know how much bight you are allowing on the hose so I can do the calculation? 

[nearlythere]

Kurnal I need to know how much bight you are allowing on the hose so I can do the calculation? 

Now that might stump him a little (without looking up the drill book or Manual of Firemanship). Long time since he got to work from a ladder I would say.

[kurnal]

Never really agreed with bights the way so many colleagues used them. The purpose of a bight was to enable you to advance towards the fire, or if working off a ladder to have neough hose to be able to move the branch effectively. But many colleagues seemed to insist on having a bight of at least 3m hanging below the rolling hitch or hose suspender, kinking the hose and adding unsupported weight above the level of support provided by the hitch or suspender.

So in the stairway I would have a bight on the top landing sufficient to allow me to advance towards the fire, and this is the same whether I use a riser or run the hose up the stairs. So it does not need to be added in to any formula for the increased distance caused by running the hose up the staircase. Answer complete Sub.

[Psuedonym]

This isn't a reference to the requirements for : Tripping Capability ( 3/4" and  1" Hose Dia.), as indicated within The Daft Rules & Regs legislation for fire hoses situated on landings is it? No? Phew...cos that really is a complex formula