Metering pumps performance

Metering Pump—Perform two checks of flow rate for each test as described in the Procedure section. 

XI. 5.6 If the time measured to reach 100 mm AP exceeds 60 s, either the filter bypass valve is leaking or the fuel metering pump performance is unsatisfactory. In this case, the fuel metering pump performance should be checked to determine if the pump or filter bypass valve needs to be replaced. 

Provision should be made for testing of individual pump performance and should include a test header with either Vh in (6.4 cm) outlets, or an approved flow meter. The latter is preferred because of its ease of testing and the water can be returned to the source tanks and reservoirs. If pulling from a river or waterway, there may be environmental requirements of returning water to the river or waterway. 

In such a system, known quantities of the different compounds required to produce the final gas mixture are easily controlled (either by using high-precision metering pumps or mass flow meters) and injected into a flash evaporator (EV01) working at high temperature. Once the vaporization is performed, the gas is... 

The second set of fissure-elution experiments was performed in the same manner as described for the first set of fissure-elution experiments. The difference in the second set of experiments was that after 0.67 fissure volumes of stock solution were drawn into the fissures at their respective flow rates, the stock solution in the reservoirs was replaced with rock-equilibrated water. The solution metering pumps were not turned off during the exchange. Subsequently, a total of twenty fissure volumes of solution was drawn through each fissure before the metering pumps were turned off. After the metering pumps were stopped, the rock-equilibrated water was removed from the reservoirs and the solution in the fissures was rapidly drawn off. 

Column Infiltration Experiments. Six infiltration experiments, each at a different flow, were performed with one column of glauconite. The apparatus used in the infiltration experiments consisted of a mineral column contained in a stainless-steel tube connected to a sample-injection valve and a solution-metering pump. Glauconite [a hydrous silicate, nominally (K,Na) (Al,Fe ... 

Investigators used an adjacent pump of the same detail and size to inspect for methane accumulation. A small flow of well water was routed to the gland on an idle sister pump for more than a day. The explosion meter tests performed after a day revealed that there was sufficient accumulation of methane to be troublesome. 

As reviewed concerning screw types, these dynamic mixers are used to improve screw performance. Static mixers are sometimes also inserted at the end of the plasticator. Proof of their success is shown by their extensive use worldwide. Each type of mixer offers its own advantages and limitations. Where practical they should not be located in a region where the melt viscosity is not too low. With some of these installations because they may have to operate at a lower speed to avoid problems such as surging, independently driven mixers can be used so machines can operate at optimum speed. Other benefits of independently driven mixers involving feeding capability and performance occur. For example, metering pumps can inject with precision liquid additives directly into the mixer. 

The process should be performed without additives requiring an additional storage system and a metering pump. 

Liquid sulphur processed from natural gas and mineral oil resources does not present these prc lems. Nevertheless filtration as outlined above is performed between store tanks and metering pump or day tanks and metering pun. ... 

A chemical metering pump should have a calibration chamber installed (Figures 7-11, 7-12, and 7-13). This facilitates periodic calibration. Pump calibration can be performed without a permanently installed calibration system. This would require valves to discharge the chemical from the pump to a container. The volume delivered for a measured time can then be recorded. 

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