Liquid Water - Intergraph Smart Instrumentation - Reference - Hexagon

Calculate FF:

Calculate n:

Calculate Kc :

Calculate effective head coefficients:

Calculate first value of CV:

Calculate Fp:

Calculate Kcv:

Calculate FLP:

Calculate Re:

Calculate DPA:

Calculate Fr:

At this stage, the following cases for different Re are possible:

1. Case Re< - Laminar flow

   

2. Case 56 < Re <40000 - Transitional flow

   

   

   

   

   

   

3. Case Re>40000 - Turbulent flow

   

The condition determines:

Case A - Cavitation and Flashing

1. Cavitation takes place if P2ñPV, otherwise flashing case takes place.

2. Calculate new CV.

   ISA Standard:

   

   IEC Standard:

   

Case B (P1 - P2 £ DP A) - Usual

ISA Standard:

IEC Standard:

Calculate the relative change in the CV:

Steps 5 to 13 are repeated until the relative change in the CV is less than 0.001.

Define "Incipient" case. The "Incipient" case takes place if

Calculate outlet pipe velocity: