head pressure

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inlet pressure

i. The total pressure taken in the engine inlet as a measure of air density. This parameter is sent to the fuel control for fuel scheduling. It is normally known as P1 pressure.
ii. As it relates to the performance data on pumps, when not other-wise specified, the total static pressure measured in a standard testing chamber by a vacuum gauge located near the inlet port. Also called intake pressure, fine pressure, or head pressure.
References in periodicals archive ?
If the feed-throat pressure development exceeds the discharge pressure, the output will exceed the drag flow, resulting in further throughput gains.
These pumps produce a constant flow at a steady speed, regardless of the discharge pressure.
Being a true positive-displacement reciprocating pump, this offers excellent energy efficiency, consistent flow rate unaffected by discharge pressure, and field-proven reliability.
Solar's compressors continue to gain increased acceptance at higher discharge pressure levels.
The control strategy for refrigeration systems is also evaluated for opportunities to reduce energy consumption through condenser fan and pump cycling, compressor staging, reduced discharge pressure operation, defrost timing and methods, use of variable frequency drives and adjustments for seasonal operating conditions.
Problems may arise from the compressor spending a certain amount of time recycling gas, until sufficient discharge pressure is produced to open the discharge check valve (Figure 3), and gas begins flowing into the pipeline.
The compressor discharge pressure was regulated via a hand-operated needle valve (DV).
Available in three sizes - B20, B32 and B40 - with maximum capacities of 15, 34 and 70 gpm at a maximum discharge pressure of 100 psi, the pumps are EHEDG certified and conform to ATEX regulations that are laid out in the 94/9/EG directive.
One of the energy saving features of the new plant is the use of variable speed fans on its condensers, which not only saves fan energy as the fans slow down, but at the same time, will provide smoother discharge pressure by modulating the fan speed as the load changes.
Associated sour gas will be injected back into the oil reservoir at pressures up to 760 bar, the highest discharge pressure ever developed for gas injection.
Temperatures can reach 662[degrees]F (350[degrees]C), with discharge pressure reaching 70 bar, (1000 psi) for cast steel, and 120 bar (1700 psi) for corrosion-resistant steel.
Standard in nickel aluminum bronze, as well as 316 stainless and 2205 duplex stainless, CodeLine reciprocating pumps offer 90 percent minimum efficiency at any discharge pressure, thereby lowering the per-gallon cost of process water.

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