4.1 The advantages of collecting zooplankton with pumps are as follows:4.1.1 Sample size is more accurately controlled than with nets.4.1.2 Discrete samples can be more easily obtained both vertically and horizontally.4.1.3 Multiple or replicate samples can be more easily obtained.4.1.4 The pumps are adaptable to a variety of ecosystems less than 30-m deep.4.1.5 Sampling efficiency does not decrease with sample size.4.2 The disadvantages of collecting zooplankton with pumps are as follows:4.2.1 Pumps are bulky and require an electrical source.4.2.2 Pumps are generally more costly than nets.4.2.3 Pumps generally discriminate against collecting macroplankton.4.2.4 Pump intake tubes may be avoided by the more motile zooplankton forms.4.2.5 Requires a long, bulky, intake tube for deep water sampling.4.3 There are several special considerations that should be observed when collecting zooplankton with a pump. They are:4.3.1 Some pumps can fragment zooplankton and induce mortality due to their design.4.3.2 The pump hose must be cleared before taking the next sample.1.1 This practice covers the procedures for obtaining qualitative/quantitative samples of a zooplankton community by use of pumping systems.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 加购物车

This specification covers the design and construction requirements of rotary positive displacement distillate fuel pumps intended for use in shipboard. Pumps covered by this specification are of Types II, III, IV, V, VIII, X, and XI and of sizes A-H. The pump shall be manufactured capable of sustaining operation in any direction up to a certain inclination, shall withstand environmental vibration induced by shipboard machinery and equipment, shall be driven by an electric motor, and besides distillate fuel, the pump shall also be used to pump aviation turbine fuel. Performance acceptance tests shall be performed, including mechanical running test, noise test, and hydrostatic test, and shall conform to the requirements specified.1.1 This specification covers the requirements applicable to the design and construction of rotary positive displacement distillate fuel pumps for shipboard use.1.2 Lineal dimensions and units of force in this specification are expressed as inches and pounds respectively. A companion metric standard is in the process of preparation.1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 加购物车

定价： 590元 加购物车

定价： 590元 加购物车

定价： 646元 加购物车

This test method establishes the apparatuses required, calibration and precision of the devices to be used, and the standard procedures for determining the measured speed, or volumetric flow rate, of oil diffusion pumps. This method shall make use of test dome, gage attachment or connecting line, flow-measuring devices, and leak control valve. The pump under test shall be fitted with a test dome of specified design. Gas is then admitted to the test dome in a specified manner at a measured rate, and the resulting change in equilibrium pressure is measured in the specified way.1.1 This test method covers the determination of the measured speed (volumetric flow rate) of oil diffusion pumps.1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 加购物车

This specification defines the requirements for rotary positive displacement pumps for shipboard use. This specification does not include pumps for hydraulic service or cargo unloading applications. Pumps under this specification include the following types and classes: Type II, Type III, Type IV, Type V, Type VIII, Type X, Type XI, Class A, Class B, Class CD, Class CH, Class DD, Class DH, Class G, Class LM, Class LA, Class M, and Class W. Pump component parts such as casings, heads, and covers; shafts; rotors; rotor housings, liners, and disks; glands; bedplates and brackets; timing gears; fasteners (studs, bolts, screws, and nuts); O-rings and other elastomers; gaskets; and vanes and shoes, shall be constructed of the specified materials. General requirements for: (1) service life, (2) operation during inclinations, (3) environmental vibration, (4) internally excited vibration levels, (5) airborne noise level, (6) driver, (7) reduction gears, (8) mounting of horizontal and vertical pumps, (9) seating surface, (10) face mounted motors, (11) couplings, (12) direction of rotation, and (13) inlet and outlet connections, are detailed. Pump design and construction requirements for the following are specified: (1) flanges, (2) pump casing, (3) radial and thrust bearings, (4) rolling contact bearings, (5) mechanical shaft seals, (6) backup packing box, (7) pump head or end covers, (8) rotors and timing gears, and (9) fasteners. The pump shall meet the required rated capacity. Requirements for (1) painting and coating and (2) testing including hydrostatic test, mechanical running test, and performance test are also specified.1.1 This specification defines the requirements applicable to design and construction of rotary positive displacement pumps for shipboard use. The classes of service are shown in Section 4.1.2 This specification will not include pumps for hydraulic service or cargo unloading applications.1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 加购物车

6.1 The objective of this practice is to standardize the evaluation method for assessing the hemolytic effect of a blood pump used in extracorporeal circulation and/or circulatory assistance. By comparing the hemolysis results between a subject device and a comparator device through paired testing, a relative evaluation of hemolysis for the subject device can be made.1.1 This practice covers a protocol for the assessment of the hemolytic properties of continuous, intermittent, and pulsatile flow blood pumps used in circulatory assist, including extracorporeal, percutaneous, and implantable devices. An assessment is made based on the pump's effects on the erythrocytes over a certain period of time. Adopting current practices for this assessment, a 6-hour in vitro test is performed on a pump placed in a device-specific recirculating blood loop that mimics the pressure and flow conditions of the expected worst-case clinical use of the device. If the ultimate goal of the testing is to evaluate the blood damage potential of a pump for clinical use, it is suggested that paired testing between the subject blood pump and a legally marketed comparator device be conducted using the same blood pool in a matched blood test loop so that a relative hemolysis comparison can be made.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 加购物车

定价： 590元 加购物车

5.1 Most occupational exposure assessment methods require the use of personal sampling pumps to collect air samples at typical sampling flow rates, with sampling volumes specified by (a) particular procedure(s). The precision and bias of these methods are directly affected by the precision and bias of the pumps used in the measurement of the air volume(s) sampled.1.1 This practice describes the setting and verification of flow rate for sampling pumps commonly used for monitoring personal airborne exposures in the workplace.1.2 This practice includes procedures for using working standard flow meters that are traceable to national or international standards, as well as those that are not. Traceable standards are preferred.1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 加购物车

定价： 646元 加购物车

定价： 515元 加购物车

4.1 The performance criteria listed in this guide will provide guidance in the selection of oil spill pumping equipment.4.2 This guide has been developed for use by the following: manufacturers of pumping systems who wish to establish a common means of evaluating and reporting the performance characteristics of their products; and existing or potential users of pumping systems who wish to compare the performance characteristics of various products.1.1 This guide is intended as a guideline for the standardized reporting of performance data of pumps and pump systems that may be considered for use in oil spill response operations. The present objective is to develop a reporting guideline to aid in the comparative evaluation of various devices.1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 加购物车

5.1 In vitro hemolysis test results for blood pumps may be substantially affected by donor species, sex, age, fasting, the method of harvesting, the anticoagulant properties, the period of storage, the biochemical state of the blood, and the hemoglobin and hematocrit level of blood.3,4 Therefore, standardization of proper whole blood collection and preparation for the dynamic in vitro evaluation of blood pumps is essential, and this recommended practice will allow an acceptable comparison of test results among hemolysis tests involving similar testing methods.1.1 This practice covers whole blood that will be used for the in vitro performance assessment of hemolysis in blood pumps intended for clinical use.1.2 This practice covers the recommended standard collection, preparation, handling, storage, and utilization of whole blood for the in vitro evaluation (see Practice F1841) of the following devices:1.2.1 Continuous flow blood pumps (roller pumps, centrifugal pumps, axial flow pumps, etc.).1.2.2 Pulsatile and intermittent flow blood pumps (pneumatically driven, electro-mechanically driven, with an artificial pulse, etc.).1.3 The source and preparation of whole blood utilized for the dynamic in vitro evaluation of red blood cell (erythrocyte) trauma caused by blood pumps can substantially influence the hemolysis performance of these devices. Thus, standardized whole blood collection and preparation methods are required.1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 加购物车

定价： 515元 加购物车