Hi all.
A month ago a student completed an 'exemplar' welding lesson for me so I could monitor consumables and work out costs.
I have worked out the following but would appreciate if someone could 'check my work'. The minutes of welding, cost of Gas bottle and quantity of bottle are correct. My workings seem to me to be correct but hard to believe?
Gas used: Argoshield Universal
(Gas Composition: 86% Ar, 12% CO2, 2% O2)
Cost: £71.87(inc VAT)
Gas bottles have a £2.18(inc VAT) environment surcharge per bottle so actual cost is £74.05
Gas contents: Small(X) 2,500 gaseous litres, Medium(Y) 5,000 ltrs, Large(W) 11,700 ltrs
We use Large, regulator set at 14 lpm
In typical lesson exercise of one hour, student welded for 26 minutes so 14 lpm x 26 mins is 364 gaseous litres.
Normal lesson is 2 hours so usage would be: 728 gaseous litres
728 x 15 students per lesson: 10,920 gaseous litres
Conclusion:
We would use 10,920 gaseous litres in one 2 hour lesson.
Cost: 10,920 is 93% of 11,700 / £68.86 is 93% of £74.05
So cost of gas for 15 students would be £68.86
(obviously in the 'real world', all 15 students' performance would vary hugely, but all I have for now is one student's data so I am going off that. Also, I am aware that not all 11,700 litres of a gas bottle are used)
A month ago a student completed an 'exemplar' welding lesson for me so I could monitor consumables and work out costs.
I have worked out the following but would appreciate if someone could 'check my work'. The minutes of welding, cost of Gas bottle and quantity of bottle are correct. My workings seem to me to be correct but hard to believe?
Gas used: Argoshield Universal
(Gas Composition: 86% Ar, 12% CO2, 2% O2)
Cost: £71.87(inc VAT)
Gas bottles have a £2.18(inc VAT) environment surcharge per bottle so actual cost is £74.05
Gas contents: Small(X) 2,500 gaseous litres, Medium(Y) 5,000 ltrs, Large(W) 11,700 ltrs
We use Large, regulator set at 14 lpm
In typical lesson exercise of one hour, student welded for 26 minutes so 14 lpm x 26 mins is 364 gaseous litres.
Normal lesson is 2 hours so usage would be: 728 gaseous litres
728 x 15 students per lesson: 10,920 gaseous litres
Conclusion:
We would use 10,920 gaseous litres in one 2 hour lesson.
Cost: 10,920 is 93% of 11,700 / £68.86 is 93% of £74.05
So cost of gas for 15 students would be £68.86
(obviously in the 'real world', all 15 students' performance would vary hugely, but all I have for now is one student's data so I am going off that. Also, I am aware that not all 11,700 litres of a gas bottle are used)