How to Field Measure a Steam Coil

How to Measure a Coil

Steam Coil Measurement Notes:

  1. Collect any / all dimensions available.
  2. For direct replacement coils, the most important dimensions are the overall space available and the connection dimensions.

A - Fin Height: Height of the fins measured in the same direction as the header.

B - Case Height: Height of the coil is measured from outer case flange to outer case flange, in the same direction as the fin height.

C - Fin Length: Length of the fins measured in the same direction as the tubes.

D - Case Length: Length of the coil is measured from outer case flange to outer case flange, in the same direction as the tubes.

E - Case Depth: Measure how thick the coil is in direction of airflow.

F - Overall length: Length of the coil is measured from the outer case flange on the back of the coil to the front of the header, not including connections.

G - Return Connection Location: Connection location is measured from the bottom of the coil to the centerline of the connection.

H - Feed Connection Location: Connection location is measured from the bottom of the coil to the centerline of the connection.

I - Fins Per Inch: Count the number of fins in a 4” space and divide by 4.

J - Number of Rows of Tubes: On the back side of the coil (opposite header end) count how many rows of tubes there are.

K - Tube Diameter: This is the size of the tubes in the fin bundle feeding the header.

L - Return Connection Size: For pipe sizes measure the inside diameter of the connection.

M - Feed Connection Size: For pipe sizes measure the inside diameter of the connection.

N - Connection Length: Length that the connection extends from the face of the header.

O - Connection Center Line: Centerline of each connection measured from the edge of the coil case.

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