Operating and Start-up Load & Operating and Start-up Current Calculation for Heat Tracing System

1.    Operating and Start-up Load & Operating and Start-up Current Calculation for Heat Tracing System

 

Operating Load Calculation: -

Lo = TL X Om ---------------------------------------------------------- (1)

Where

Lo = Operating Load

TL = Total Heating Cable Length

Om = Output of Heating Cable at Maintain Temperature

TL = (L X SR + V X A + F x A + S X A + I X A +M) 

Where

TL = Total Heating Cable Length

L = Pipe Length

SR = Heating Cable Runs

A = Allowance Heating Cable

V = Valve

F = Flange

S = Support

I = Instrument

M = Power and End Termination Margin

Output of Heating Cable: - We are already decision in the previous articles that how we calculated output of series heating cable and output of self-regulating heating cable.

Start-up Load Calculation: -

Ls = TL X Oa ---------------------------------------------------------- (2)

Where

Ls = Start-up Load

TL = Total Heating Cable Length

Oa = Output of Heating cable at Minimum Ambient Temperature

Unit of Load:-

Load = m X W/m

Load = W

OR

Load = W/1000 = kW

Operating Current Calculation: -

Io = Lo / Vs

Where

Io = Operating Current

Lo = Operating Load

Vs = Supply Voltage

Operating Load will be calculated as per above formula / equation (1).

Supply Voltage will be given by customer.

Start-up Current Calculation: -

Is = Ls / Vs

Where

Is = Start-up Current

Ls = Start-up Load

Vs = Supply Voltage

Start-up Load will be calculated as per above formula / equation (2).

Supply Voltage will be given by customer.

Unit of Current:-

Current = W / V

Current = A