Service Delivery 3 Hose and Hose Fittings
Aim To provide students with an understanding of hose and hose fittings
Learning Outcomes At the end of the session students will be able to: • Recognise the standard terminology in relation to hose and hose fittings • Describe the construction of hose and associated fittings • Describe how to care for hose and associated fittings.
Delivery hose • Supplied in 25m lengths • Either 45mm or 70mm diameter • Some 90mm diameter hose stored on the hose layer at C7 Station, Barton.
Delivery hose • The hose is non-percolating • Consists of a plastic outer cover to resist abrasion • Inside of the hose is lined with a water resistant coating • Sandwiched in between is a fabric sheath made up of weft and warp yarns.
Characteristics of hose • Flexible - easily handled without kinking • Durable - resistant to abrasion • Rot resistant - fibres treated for mildew • Size - on charging, change in length and diameter should be minimal • Friction loss - 0.2 bar per length • Weight - approximately 550g per metre.
Hose care • Store in a cool, dry, ventilated place • Avoid scorching hose on the fireground • Hose laid across roads should be ramped • Under run hose before making up • Hose should never be charged suddenly • Hose should never be dragged when laying out or making up.
Hose-reel tubing • Non-percolating • Non-flattening • Consists of a 19mm diameter rubber tube reinforced with 2 layers of synthetic cords, all covered with an abrasion resistant rubber • 3 X 20m lengths of tubing are kept in each rear locker.
Suction hose • Specifically designed to withstand external pressures • Should not be charged to an internal pressure of more than 3.5 bar • Constructed from steel reinforced rubber or from nylon and plastic • Normally has an internal diameter of 100mm.
Suction hose Care and maintenance; • Wash after use with clean water • Lubricate coupling nut and check washer • Do not drag or drop couplings • Correct size wrench to be used at all times.
Standard instantaneous couplings Pull release.
Standard instantaneous couplings Twist release.
Suction hose couplings • Usually 100mm diameter the male part consists of; Ribbed tail Two fixed lugs Threaded end.
Suction hose couplings • The female coupling consists of 3 castings; Ribbed tail Threaded sleeve Nut with 4 lugs and a washer.
Suction coupling wrenches • Conventional or universal types.
Branches • “A” type • Akron type controllable • Diffuser.
ConfirmationAssessments will be based on this lesson and the corresponding study note Learning Outcomes • Recognise the standard terminology in relation to hose and hose fittings • Describe the construction of hose and associated fittings • Describe how to care for hose and associated fittings.