## Steam Jacket Viscosity Reduction Calculations

## Steam Jacket Viscosity Reduction Calculations

(OP)

Hi everyone,

I'm looking to determine the time it takes for the viscosity of the pumpage to reduce to a suitable level to allow the pump to operate freely. The pump in question is a CP13 PP26 (API674 Direct Acting Recip.) The pump end has been fitted with steam jackets. I have limited information as follows:

pumpage - heavy hydrocarbon (tar)

steam temp. in jackets - 215C

thickness between steam jacket cavity and pump body - 0.4375"

material - cast steel

pumping temp. - 120C (min) to 242C (max)

Discharge pressure - 17.5 kg/cm^2

Suction pressure - 3.6 kg/cm^2

I realise that this in not alot to go on but I would be very grateful to hear your thoughts/recommendations to give me a better idea of how long it will take to reduce the viscosity to allow the pump to work.

If you would like further info just let me know.

Thanks for your attention!

I'm looking to determine the time it takes for the viscosity of the pumpage to reduce to a suitable level to allow the pump to operate freely. The pump in question is a CP13 PP26 (API674 Direct Acting Recip.) The pump end has been fitted with steam jackets. I have limited information as follows:

pumpage - heavy hydrocarbon (tar)

steam temp. in jackets - 215C

thickness between steam jacket cavity and pump body - 0.4375"

material - cast steel

pumping temp. - 120C (min) to 242C (max)

Discharge pressure - 17.5 kg/cm^2

Suction pressure - 3.6 kg/cm^2

I realise that this in not alot to go on but I would be very grateful to hear your thoughts/recommendations to give me a better idea of how long it will take to reduce the viscosity to allow the pump to work.

If you would like further info just let me know.

Thanks for your attention!

## RE: Steam Jacket Viscosity Reduction Calculations

From "BigInch's Extremely simple theory of everything."

## RE: Steam Jacket Viscosity Reduction Calculations

I now have a value for BTU's/sec but I'm not sure what to do with it to find the time it takes to raise the temperature of the tar to a suitable level.

Any suggestions?

## RE: Steam Jacket Viscosity Reduction Calculations

Sorry I didn't notice the SI units, but we'll continue with these BTUs for now, so I won't make a mistake. Maybe we'll try SI later.

We need the heat capacity of the tar.

The heat capacities of liquid hydrocarbons are about equal to their specific gravities, SG x 1 BTU/Lb-F°

Its SG is probably close to water, so let's just say it is 1 BTU/lb-F°

... divide the heat capacity of the tar by the BTU/sec and multiply by the mass (pounds) of tar in the cylinder and multiply again by the F degrees that you want to raise the temperature,

ΔT_F° say from 25°C to 200°C is 175C° so multiply that by 9/5 to get F° for ΔT_F°

SG

_{tar}* 1 BTU/lb-F * M_lbs_{tar}/ H_BTU/sec * ΔT_F°That's the number of seconds you'll have to apply the heat to reach your target temperature, assuming that the heat is uniformly being applied to the surface of the tar. Then just check your tar's viscosity at that target temperature to see if it is suitable to pump.

From "BigInch's Extremely simple theory of everything."

## RE: Steam Jacket Viscosity Reduction Calculations

Thanks very much for your help!