scholarly journals The Effect of Size and Material of Packing Seal and Pump Flow Rate to Leakage Rate at Stuffing Box of Centrifugal Pump

2020 ◽  
Vol 6 (2) ◽  
pp. 101-114
Author(s):  
Mohd Zafuan Mohd Zainal ◽  
Mohd Yusri Mohd Yunus ◽  
Aaina Syakirah Nor Azizan ◽  
Nurul Ain Ismail
Keyword(s):  
Cost Saving ◽  
Flow Rate ◽  
Operating Cost ◽  
Leakage Rate ◽  
Feasibility Analysis ◽  
Maintenance Cost ◽  
Pump Flow ◽  
Pump Flow Rate ◽  
Discharge Valve ◽  
Valve Opening

This research explore on the effect of size and material of packing seal and discharge valve opening to the leakage rate at stuffing box for pump P7301-A. Leak at stuffing box is unavoidable due to gap exists between the pump casing and shaft. Therefore, it is necessary for a suitable sealing system which includes packing size and material to be installed on all pumps for controlling the leakage rate without damaging the pumps. It is also important for operator to know the proper discharge valve opening at which the pump should be operated to get minimum leakage. Experiment was conducted by recording the leakage volume at stuffing box with changes of size (9mm, 10mm and 11mm) and material (graphite, polytetrafluoroethylene (PTFE) and PTFE-Asbestos) of packing seal and discharge valve opening (50%, 75% and 100%) that would determine the pump flow rate. The experiment was executed and analyzed using one factor at a time (OFAT) method whereby the testing of factors conducted one at a time instead of multiple factors simultaneously in determining which setting would lead to the lowest leakage rate without compromising the pump’s healthiness. Feasibility analysis was also conducted on the operating cost focusing on saving in utility bill and maintenance cost that focused on painting and fitting replacement works. Result from experiment and analysis showed that packing seal size and discharge valve opening have effect on leakage rate at stuffing box while material of packing seal is not significant in influencing the leakage rate of this pump. Larger size of packing seal would cause lower leakage rate due to greater obstruction at stuffing box. Leakage rate also declined when the discharge valve was fully opened due to less resistance created at the discharge line had reduced the pressure in the pump casing which led to less leakage at stuffing box. Feasibility analysis showed cost saving of RM5,930.00 on the operating cost and cost saving of RM221,200.00 on the maintenance cost for 10-year operation of 10 pumps can be achieved. Outcome from this study can be utilized to reduce the plant operating cost, maintenance cost, manhours saving and preserve the treated water resources.

Does the Blood Pump Flow Rate have an Impact on the Dialysis Dose During Low Dialysate Flow Rate Hemodialysis?

2018 ◽  
Vol 46 (4) ◽  
pp. 279-285 ◽  
Author(s):  
Maxime Leclerc ◽  
Clémence Bechade ◽  
Patrick Henri ◽  
Elie Zagdoun ◽  
Erick Cardineau ◽  
...  
Keyword(s):  
Flow Rate ◽  
Blood Pump ◽  
Bivariate Analysis ◽  
Dialysis Dose ◽  
Dialysate Flow ◽  
Pump Flow ◽  
Dialysate Flow Rate ◽  
Pump Flow Rate ◽  
A Prospective Study ◽  
The Impact

We conducted a prospective study to assess the impact of the blood pump flow rate (BFR) on the dialysis dose with a low dialysate flow rate. Seventeen patients were observed for 3 short hemodialysis sessions in which only the BFR was altered (300,350 and 450 mL/min). Kt/V urea increased from 0.54 ± 0.10 to 0.58 ± 0.08 and 0.61 ± 0.09 for BFR of 300, 400 and 450 mL/min. For the same BFR variations, the reduction ratio (RR) of β2microglobulin increased from 0.40 ± 0.07 to 0.45 ± 0.06 and 0.48 ± 0.06 and the RR phosphorus increased from 0.46 ± 0.1 to 0.48 ± 0.08 and 0.49 ± 0.07. In bivariate analysis accounting for repeated observations, an increasing BFR resulted in an increase in spKt/V (0.048 per 100 mL/min increment in BPR [p < 0.05, 95% CI (0.03–0.06)]) and an increase in the RR β2m (5% per 100 mL/min increment in BPR [p < 0.05, 95% CI (0.03–0.07)]). An increasing BFR with low dialysate improves the removal of urea and β2m but with a potentially limited clinical impact.

Non heart beating donors porcine livers: effect of three different pump flow rate during cardiopulmonary bypass

2007 ◽  
Vol 24 (Supplement 39) ◽  
pp. 53
Author(s):  
R. Valero ◽  
P. Santos-Cidón ◽  
M. Net ◽  
L I. Capdevila ◽  
J C. García-Valdecasas
Keyword(s):  
Cardiopulmonary Bypass ◽  
Flow Rate ◽  
Pump Flow ◽  
Heart Beating ◽  
Pump Flow Rate

Effects of Pump Flow Rate on Oxygen Use During Moderate Hypothermic Cardiopulmonary Bypass

ASAIO Journal ◽  
1993 ◽  
Vol 39 (2) ◽  
pp. 126-131
Author(s):  
Ryuji Tominaga ◽  
Kazuhiro Kurisu ◽  
Fumio Fukumura ◽  
Atsuhiro Nakashima ◽  
Manabu Hisahara ◽  
...  
Keyword(s):  
Cardiopulmonary Bypass ◽  
Flow Rate ◽  
Hypothermic Cardiopulmonary Bypass ◽  
Pump Flow ◽  
Pump Flow Rate

A1107 CEREBRAL BLOOD FLOW AND METABOLISM ARE INDEPENDENT OF PUMP FLOW RATE DURING HYPOTHERMIC CARDIOPULMONARY BYPASS IN CHILDREN

1990 ◽  
Vol 73 (3A) ◽  
pp. NA-NA
Author(s):  
F H Kem ◽  
W J Greeley ◽  
R M Ungerleider ◽  
T J Quill ◽  
B. Baldwin ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Cardiopulmonary Bypass ◽  
Flow Rate ◽  
Hypothermic Cardiopulmonary Bypass ◽  
Pump Flow ◽  
Pump Flow Rate

The effect of normothermic cardiopulmonary bypass on hepatic blood flow in the dog

Perfusion ◽  
1986 ◽  
Vol 1 (4) ◽  
pp. 245-253 ◽  
Author(s):  
RT Mathie ◽  
JB Desai ◽  
KM Taylor
Keyword(s):  
Blood Flow ◽  
Cardiopulmonary Bypass ◽  
Vascular Resistance ◽  
Flow Rate ◽  
Hepatic Blood Flow ◽  
Liver Blood Flow ◽  
Relative Reduction ◽  
Blood Flows ◽  
Pump Flow ◽  
Pump Flow Rate

Hepatic blood flow was investigated in two groups of eight anaesthetized dogs during and after one hour of either pulsatile or non-pulsatile cardiopulmonary bypass (CPB). Mean perfusion pressure was maintained at 60 mmHg. Hepatic arterial (HA) and portal venous (PV) blood flows were measured using electromagnetic flow probes, and hepatic O 2 consumption determined. The results demonstrate that: (a) pulsatile CPB reduces peripheral vascular resistance during and after perfusion, and more effectively preserves pump flow rate and cardiac output than non-pulsatile CPB; (b) total liver blood flow is sustained more effectively by pulsatile CPB than by non-pulsatile CPB due to relative preservation of both HA and PV flows; (c) hepatic O2 consumption is only marginally better preserved during and after pulsatile CPB than with non-pulsatile perfusion. We conclude that: (a) pulsatile CPB tends to maintain hepatic blood flow through a relative reduction in HA vascular resistance and an improvement in PV flow produced passively by a greater pump flow rate; (b) pulsatile CPB less effectively benefits hepatic O2 consumption because of poor O2 uptake from the hepatic PV blood supply.

Determination of Pump Flow Rate During Cardiopulmonary Bypass in Obese Patients Avoiding Hemodilution

2009 ◽  
Vol 24 (3) ◽  
pp. 245-249 ◽  
Author(s):  
Luisa Santambrogio ◽  
Cristian Leva ◽  
Giorgio Musazzi ◽  
Piergiorgio Bruno ◽  
Andrea Vailati ◽  
...  
Keyword(s):  
Cardiopulmonary Bypass ◽  
Flow Rate ◽  
Obese Patients ◽  
Pump Flow ◽  
Pump Flow Rate

Model Study for Upgrading of Sungai Belibis Pump Sump

2015 ◽  
Vol 802 ◽  
pp. 617-622 ◽  
Author(s):  
M.A.Z. Mohd Remy Rozainy ◽  
A.W. Khairy ◽  
Ismail Abustan ◽  
Mohd Mustafa Al Bakri Abdullah
Keyword(s):  
Water Level ◽  
Flow Rate ◽  
Flow Characteristics ◽  
Worst Case ◽  
Pump Flow ◽  
Model Study ◽  
Swirl Angle ◽  
Pump Flow Rate ◽  
Pump Sump ◽  
Model Features

Experimental study of hydraulic physical model investigates the flow characteristics in the pump sump. The model features four pumps (7.91 L/s for pump 1 and 2, and 4.74 L/s for pump 3 and 4) with a total of 9 cases of study. Different values of water depth (180mm, 200mm, and 300mm) and pump flow rate (15L/s, 20L/s, and 25L/s) were conducted. Velocity measurements at the dividing cross section were obtained by an Acoustic Doppler Velocimeter (ADV), pump flow rate by flow meter (Dyna Handheld Transit Time Ultrasonic Flow Meters) and swirl angle in the suction intakes were measured by a vortimeter/rotometer. No vortices were occurred near the suction intake at the high and medium water level conditions. In the low water level condition with high flow rate (25L/s), vortex Type 4 or 5 were observed near the suction intake and this condition is unacceptable. Since this condition indicate the presence of vortices more than Types 2 and an uneven flow through the suction intake, this can be categorized as the worst case and not recommended for pump sump operation.

scholarly journals System for preventing the water cone formation in gas deposits with low gas thickness

2021 ◽  
Vol 266 ◽  
pp. 01002
Author(s):  
D.E. Kopylov ◽  
A.V. Strekalov
Keyword(s):  
Flow Rate ◽  
Production Well ◽  
Screw Pump ◽  
Pump Flow ◽  
Pump Flow Rate ◽  
Cone Formation ◽  
Water Accumulation ◽  
Saturated Thickness

The article describes the problem of water cone formation in gas deposits of small gas-saturated thickness. The process of pulling the water cone into the production well is analyzed. The most popular and effective methods of solving this problem are presented. A method of using an electric screw pump to prevent water accumulation in the bottomhole zone is proposed. The method of calculating the optimal pump flow rate, which allows operating the well without its overheating, is considered.

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