The Basics of Lead-Lag Configurations. Using multiple pumps that run in sequence—also known as running a lead-lag system—is a common way to meet varying pump system demand. Cycling of the lead pump adds reliability in the form of redundancy and increases the lifespan of the system.
What is Valve lead lag and overlap?
Valve lead. The amount in crankshaft degrees the valves open before TDC or BDC. Valve lag. The amount in crankshaft degrees the valves close after TDC or BDC. Valve overlap.
Lead/Lag: Lead/lag controls are typically found on reciprocating compressors. When there are two compressors in the system, one compressor can be set as the lead compressor, and the other as the lag compressor. When the pressure drops to a certain point on the lead compressor, the lag compressor will then take over.
In international finance, leads and lags refer to the expediting or delaying, respectively, of settlement of payments or receipts in a foreign exchange transaction because of an expected change in exchange rates.
Standby equipment is intended to minimise downtime and keep process systems running. There are two distinct schools of thought when it comes to implementing standby pumps. This first is a duty/standby arrangement, where the standby pump is only required in the event of a duty pump failure.
The operation system of the standby pump is divided into standby operation, idle running automatic flow rate adjustment operation, and discharge operation.
Lead and lag are both used in the development of the project schedule. Lead is an acceleration of the successor activity and can be used only on finish-to-start activity relationships. Lag is a delay in the successor activity and can be found on all activity relationship types.
[tahym-lag] the period of time between two closely related events, phenomena, etc., as between stimulus and response or between cause and effect: a time-lag between the declaration of war and full war production.
A hydrograph shows two graphs - rainfall (in bars) and discharge (in a line). The peak rainfall is the time of highest rainfall. The peak discharge (the time when the river reaches its highest flow) is later because it takes time for the water to find its way to the river (lag time) .
Specifically, Depth Returns is defined as: The measured hole depth (lagged depth) that corresponds to the depth of returning mud/cuttings sample. When logging gas (WITS ID 0140) to the database it is more accurate to use this depth instead of the current hole depth.
Factors affecting a flood hydrograph: Characteristics of the Drainage Basin: - impermeable rocks (e.g. granite) and soil (e.g. clay) will not allow water to pass through, resulting in large amounts of surface runoff and a greater flood risk as rivers respond quickly - results in a short lag time.
Baseflow (also called drought flow, groundwater recession flow, low flow, low-water flow, low-water discharge and sustained or fair-weather runoff) is the portion of streamflow delayed shallow subsurface flow". It should not be confused with groundwater flow. Fair weather flow is called as Base flow.
In hydrology, throughflow, a subcomponent of interflow, is the lateral unsaturated flow of water in the soil zone, where a highly permeable geologic unit overlays a less permeable geologic unit, and which returns to the surface, as return flow, prior to entering a stream or groundwater.
Unit hydrograph is a direct runoff hydrograph resulting from one unit(one inch or one cm) of constant intensity uniform rainfall occurring over the entire watershed. The concept of unit hydrograph is based on linear systems theory and follow the principles of superposition and proportionality.
A hyetograph is a graphical representation of the distribution of rainfall intensity over time.
It can be defined as the direct runoff hydrograph (DRH) resulting from one unit (e.g., one cm or one inch) of effective rainfall occurring uniformly over that watershed at a uniform rate over a unit period of time.
Hydrograph Vocabulary. 3. HYETOGRAPH ? A hyetograph is a graphical representation of the relationship between the rainfall intensity and time. ? It is the plot of the rainfall intensity drawn on the ordinate axis against time on the abscissa axis. ? The hyetograph is a bar diagram.
River discharge is the volume of water flowing through a river channel. This is the total volume of water flowing through a channel at any given point and is measured in cubic metres per second (cumecs). The discharge from a drainage basin depends on precipitation, evapotranspiration and storage factors.
List of rivers by discharge
|3||Eurasia||Ganges – Brahmaputra – Meghna|