Verification Case 17
PRODUCT: AFT Fathom
TITLE: FthVerify17.fth
REFERENCE: Ingersoll-Dresser Pumps, Cameron Hydraulic Data, 18th Ed., 1995, Published by Ingersoll-Dresser Pumps, Page 3-9, 10
FLUID: Water at 68 deg. F
ASSUMPTIONS: N/A
RESULTS:
| Parameter | Cameron | AFT Fathom |
| Suction head (feet) | -5.35 | -5.35 |
| Discharge head (feet) | 290 | 289.7 |
| Pump head (feet) | 295 | 295.0 |
| NPSHA (feet) | Not provided | 27.80 |
DISCUSSION:
The losses at the pump suction are not explicitly provided in AFT Fathom's library, so the total K factor of 1.57 for the foot valve and long radius elbow is entered as a fitting and loss value in pipe P1. The losses in the discharge piping are in AFT Fathom's library, and are selected as fitting and loss values in pipe P2. The only loss not shown in pipe P2 is the entrance loss at the discharge tank, and that is modeled in the reservoir junction, J3.
The 200 gpm is modeled at the pump as an assigned flow pump.
The AFT Fathom NPSHA prediction is shown in the Pump Summary at the top of the Output window. The suction head is shown as the difference between the EGL inlet and the elevation (23.27 – 28.62) at the pump, J2. It is the negative of the suction lift. The discharge head is shown as the difference between the EGL outlet and the elevation (318.30 – 28.62) at the pump.
