High Pressure Lifting Bags

SECTION: Tools and EquipmentISSUED: 02-2011 REVISED: ##-####

Objectives

• To provide an understanding of the following– Specifications– Use– Maintenance – Safety

Specifications

• Lift bags are constructed of neoprene with three layers of Kevlar

• Operating pressure: 118 psi

• Factory tested at 200 psi

• Field tested at 30 psi without a load

• Melting point: 220ºF

Model Size (Inche

s)

Tons Lift (Inche

s)

Burst (psi)

KPI-12 12 X 12 10.8 8.2 700

KPI-17 15 X 21 15 9 700

KPI-22 20 X 20 20.2 11 700

KPI-32 24 X 24 29.9 13 600

Load Chart

• Maximum ratings are achieved at a 1 inch lift– Lift is based on square inches of contact

• As the lift increases in height, the capacity of the lift bag will decrease– Calculations are done by multiplying the square

inches of surface contact by 118 psi

Pressure Regulator

• Piston type regulator• Up to 6000 psi

incoming pressure

• Safety valve set• 135 or 150

• Depending on model

Dual Deadman Controller

• Maximum operating pressure• 118 psi

• Safety valve setting• 118 psi

• Single inlet and dual outlets

• Quick connect fittings• With locking rings

Supply Hose

• 16’ in length• 3/8” diameter• Maximum working pressure of

250 or 300 psi• Depending on model

• Burst pressure at 1000 psi• Equipped with threaded lock

rings• Black hose

• From regulator to dual deadman control valve

• Color hose• From dual deadman control

valve to lifting bag

Inline Relief Valve

• Allows the lifting bag to remain inflated under a load after deadman control valve is disconnected

• Relieves excess pressure from the lifting bag• Above 135 psi

• Excessive pressure can be caused by load shifts or temperature changes

• Connect valve directly to deadman control valve• Preferred method

• Can connect valve directly to air bag• Use extreme caution

Use

• To lift heavy objects with the coordination of cribbing

Operating ProcedurePressure Regulator

• Attach to an SCBA cylinder

• Adjust outlet pressure• Turn adjusting knob to

set at 135 psi

Operating ProceduresDual Deadman Controller

• Attach black hose from pressure regulator• Complete with locking ring

• Attach color hose(s) to outlet(s)• Complete with locking ring

• Dual safety deadman valves• Up is green• Down is red

Maintenance• Check overall condition of the regulator and

dual deadman control valve• Wash with mild soap and water• Thoroughly inspect lifting bag after every use• Check lifting bag for leaks

• Fill to 30 psi• Coat bag with soapy water and inspect for leaks

• Check hoses for leaks, cuts, cracks, or holes• Ensure all couplings are in good working

condition

Safety

• Wear appropriate PPE– Minimum of helmet, gloves, and eye protection

• Maintain good communication between crew members involved

• Lift an inch, crib an inch• Avoid hot spots and sharp edges

• Protect bag when temp. is more than 150 degrees• Use plywood if lifting a small diameter object

• Helps distribute the weight• Do not inflate bag more than 30 psi without a load• Try to avoid stacking lifting bags

• Only stack a maximum of 2 lifting bags, with the smaller bag on top