Hi,
Slow roll of Steam Turbine can be as low as 5% of the Max Rated Speed, if that's what you are looking for. This speed is dictated by machine's lubrication system capability.
Lube oil (LO) System for Steam Turbine is usually equipped with shaft driven main LO pump along with...
Hi,
Regarding your two questions :
1. Solid containing pumped liquid is an abrasive service, for which a shorter length of shaft seal is required in view of reliability considerations. F-B seals requires the longest, followed by F-F seals and then B-B (which requires the least of the shaft...
Hi Arshad,
In order to determine reference pressure, you need to select the type of control system (Differential Pressure based system / Flow control-based system).
Differential Pressure based system --> reference pressure shall be from direct drilling on Shaft end seals (process side)
Flow...
Hi Roger,
Regarding your questions, please note :
(1) The orifice at the CSV is incorrectly sized, for which the back-pressure on the sealing system is higher than required leading to gas accumulation and eventually over-pressurization of the sealing chamber. Orifice size is a function of the...
Hi,
Regarding your two questions :
1. Solid containing pumped liquid is an abrasive service, for which a shorter length of shaft seal is required in view of reliability considerations. F-B seals requires the longest, followed by F-F seals and then B-B (which requires the least of the shaft...
Hi Rahul,
Sorry to state that your question is not quite correct.
There is no such thing as "cast iron pump with 300# rating flange". I guess you are referring to normal centrifugal pumps wherein the pump nozzles are integrally cast with the pump body. In that case, cast iron flange rating is...
I suspect you are dealing with volumes of air but with small pressure rise. Essentially this is not a compressor but rather a blower (large volume air handling equipment) OR a fan (small volume air handling equipment). Because of the small pressure rise, the density difference across the...
Based on personal experiences in Oil and Gas projects in Middle East region, the pulsation dampeners are usually as below :
For dosing (metering) applications --> gas charged type
For non-metering duty --> maintenance free bladder less type
Yes, it is not direct but rather indirectly related.
1. As part of Pump Affinity Laws, we have one for Power as well.
P1/P2= n1/n2)3(d1/d2)5
Hence, if your ultimate aim is to get to know how much power power is consuming with change in impeller diameter / speed, you can apply above formula...
Hi,
You might consider installing this compressor inside an enclosure, which may be fitted with Air Conditioning Units. The compressor inlet shall be from locally inside. Once air ambient temperature (outside enclosure) reaches 35°C, you can switch the AC on with lowest possible setting...
Hi,
Please note :-
- API 670 provides guidance on where to install vibration and temperature monitoring probes but that is meant for "monitoring" and not for safety. Alarm/Trips due to high vibration as part of equipment safety considerations is generally dictated per Company wide policy...
Hi Amer93,
Electrical motors have a limitation on the number of starts per hour for both hot start as well as cold start. So, if compressor is started multiple number of times within a short span of time, it won't be possible for you to start anytime soon beyond certain number of starts. The...
Hi,
[Q-1] Is surge a major issue in low-power(<50 kW) centrifugal fans?
Ans. You need to understand the difference between a fan / blower and a compressor. In case of a "fan" or a "blower", pressure rise is relatively small (1.05~1.15) and hence flow across the fan can be considered...
Hi,
[Q-1] Will increasing the speed of pump or fan cause the inlet pressure to it get decreased?
Ans. No. Inlet pressure will not get decreased. Theoretically, Centrifugal machines are constant head machines. Only because of system losses, we get to see a dip in head / differential pressure as...
Hi CuriousMecEng,
Please note :
1. MCSF is dictated not from percentage over Best Efficiency Flow but rather from the vibration criteria. As per API 610, vibration limits have been specified for pumps. MCSF correspond to that flow wherein the vibration limit is reached on the left side of...
Hi Abdula29,
The reason API 610 does not recommend axial clearances for axial thrust balance purposes is to avoid high internal rubbing across the two surfaces (balance disc and impeller shroud / backplate). This is particularly true for Boiler Feed Water Pumps as you said you are dealing with...
Hi CuriousMecEng,
1. No, it does not. Your interpretation is rather not correct. In diffuser design / mixed flow pumps, impeller vanes direct fluid away from the shaft and creates a hydraulic thrust in opposite direction (similar to reaction turbine blades) which do not balance the overall pump...
Hi,
Please note -
MAWP : Maximum Allowable Working Pressure is the maximum pressure that a pump can withstand under static condition, when filled with water and water pressure increased. Essentially when hydrotest is carried out, water inside of the pump casing is pressurized at 150% of the...
Affinity laws break down at flows/speed away from the actual ones at site. API 610 stipulates test speed to be no more than 3% of the actual pump operating speed.
Hence, your test rig cannot be applied. Sorry.
Hi Nick,
1. From an application perspective, control valves are used for plant based equipment control, while ARV is generally for facilities based equipment control and protection.
2. ARV is used when the fluid flowrate is not well known and/or may be variable (as in boiler feed water...
