BS 1139-1 is about tube
BS 1139-2 is about fitting
tube = NPS 1.5 pipe
standard
ledger
transom
brace :
     1) longtitunal brace
     2) transverse brace
     3) plan brace
     4) face brace @ fascade brace
     5) cross brace @ ledger brace
coupler :
     1) right-angle coupler
     2) put-log coupler
     3) swivel coupler
     4) joint pin
     5) sleeve coupler
fitting
raker
base plate
toe board
guard rail
gin wheel
castor
rungs of ladder
rolling hitch, timber hitch
bay
body belt (safety belt)
body harness
working platform
load-bearing connection
Safe Working Load (SWL)
rule of thumb:
     1) 1 ft of tube = 1 kg
     2) 1 coupler = 1 kg
     3) human = 80 kg ; human with tools = 90 kg
     4) 5 kg/ft, weight of a 10 ft tall scaffolding with 6 standards = 5X10X6=300 kg
     5) 100 bricks = 275 kg
distributed load in kN/m2



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