Manual Calculation of PSV Backpressure

I need an expert to manually calculate the PSV backpressure during a relieving operation in a liquid system. The calculation should take into consideration the pipe length and diameter as well as the pressure loss due to friction.

Ideal Skills:
- Proficiency in manual calculations
- Expertise in liquid system dynamics
- Knowledge of pressure loss factors

Experience:
- Previous work with PSV backpressure calculations
- Familiarity with liquid system operations
- Proven track record in manual engineering calculations.