LINE SIZING AND PRESSURE DROP PHILOSOPHY

The following guideline shall be used when selecting the minimum line sizes:

• 2" NB Minimum nozzle size for vessels, tanks, heat exchangers

• 2" NB Minimum process (hydrocarbon) line size

• 1½" NB Minimum utility line size

• ¾" NB Minimum bridle drain or pump casing vent / drain

• 1” NB Minimum chemical injection.

• 2” NB Minimum on pipe rack or pipe sleeper

• 4" NB Minimum for (wrapped and coated) underground lines.

• 4” NB Minimum for storm water runoff sewer drain lines

Pipe Sizing Criteria for Single Phase Fluid

The recommended velocities are based on vibration, noise and erosion considerations. The recommended pressure drop limitations are based on economic considerations and reasonable pump heads. It is difficult to establish the exact limits of min/max velocities and pressure drops analytically. The recommended values are based on common established engineering practices prevalent in the industry. Large size headers and bulk line pipes for pipeline transport are selected based on economic analysis of investment and operating cost, the guidelines in this document may not entirely apply to such situations.

Handbook Of Heat Exchangers