Hot Oil Tracing
Tracing > Hot Oil Tracing
BDP International Ltd. is offering hot-oil tracing systems
that transfer heat by using a series of pipes in a closed loop circulation system.
Our experienced team provides total EPC solutions hot-oil tracing
systems for refineries and petrochemical industry.
Design notes for hot oil tracing:
- Itís necessary to select reasonable figure for glycol tracing system for dP
to estimate the flow through tubing (50 psi?). 1/2" tubing is common, 0.049" wt is a
common wt. Copper tubing is often used.
- Determine how much flow is possible to get through various lengths, 100 to 200
feet is a typical maximum for inplant tracing. Using that flow, estimate the inside
heat transfer coefficient through the tracer. At this point, assume negligible dT.
- Now, estimate the heat transfer from the tubing surface to the air and pipe.
Assume natural convection with a heat transfer resistance from the tracer to the
air and then from the air to the pipe, say in the range of 1/4 to 1/2 BTU/hrft2F.
What the purpose of the above calculations is to determine whether
the heat transfer from the hot glycol to the pipe is a significant portion of the overall
heat transfer coefficient or if it can be neglected . Once an overall heat transfer is
known for tubing lengths, you can also see if the dT of the glycol along the length is
significant and has to be taken into account. If it is, it would be a good reason to limit
the tracer lengths on more critical tracing applications.