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Senior Applications Engineer 21 years at Instrumart. Shawn S. Senior Applications Engineer 26 years at Instrumart. Recently Viewed. Factors Affecting Operation of Ashcroft Inc. Deadweight Testers East Main 5. Personnel responsible for selection and installation should also be familiar with the safety recommendations of ASME B ASME B Pressure — Select a range so that the maximum applied pressure will never exceed the upper range limit.
Vibration — Excessive vibration could cause a loosen- ing of components and abnormal wear resulting in loss of instrument accuracy or failure to provide valid data. Temperature — Operation of the instrument in an envi- ronment where temperatures are in excess of design rat- ings may result in loss of accuracy and failure.
Process — Pressure boundary materials must be resis- tant to the process media. Failure to assure compatibility may result in pressure boundary deterioration or failure. Instruments operated at high pressure or with potentially hazardous service, such as oxygen, should be carefully selected in accordance with recognized industry codes and the recommendations of ASME B Integral to the pump is a shuttle valve that allows the operator to regulate the speed of pressure increase.
One connection to the manifold includes a cylin- der and a free-floating precision machined piston with a plate for holding calibrated weights. A second connection to the manifold accommodates a gauge or other pressure measuring device to be calibrated or checked. Incorporated into the manifold is a hand operated dis- placement valve that allows small adjustments in fluid vol- ume to be made without further operation of the pump handle or release valve.
The tester is dual range having two interchangeable piston and cylinder assemblies. One is a low pressure piston having an effective area five times larger than that of the high pressure piston. The low pressure piston is used for making measurements below 2, psi 14, kPa.
The weight masses are pre-measured and identified with the pressure values they produce when operated with the interchangeable piston and cylinder assemblies.
The tester provides consistent, repeatable accuracy, maintaining its pressure for an appre- ciable length of time regardless of temperature changes, slight leaks in the pressure system, or changes in volume of the pressurized system due to movement of a Bourdon tube or other device. A hand jack set, three wrenches, spare O-rings, and a special adapter for making connections to pressure outlets that do not accommodate cone pipe seating, are included with each unit.
An all metal, double-latched, top handle carrying case is supplied with the complete tester for all fittings and attach- ments. Deadweights are packed in metal, double- latched storage-carrying boxes. Pressure produced by the pump is distributed by the manifold, to the base of a precision machined piston and to a device being calibrated or checked. Pre-selected weights loaded onto the piston platform are acted upon by gravity and develop a force that is to be equally opposed by the fluid pressure from the pump.
When equilibrium is achieved, the pres- sure value is known, it being a direct result of the sum of the forces from the weights, piston platform and the piston divided by the effective area of the piston and cylinder assembly. When using the smaller piston and cylinder assembly, five times more pressure is required to oppose the force of a constant mass being acted upon by gravity.
Weight toler- ance within 0. Piston and cylinder is within 0. Deadweight: Non-magnetic die cast zinc alloy. Total weight to produce maximum pressure of 2. Set includes numbered weights. A operator effort when working at high pressure. Limit stops prevent rod removal during normal operation. The main component to the tester is a two stage Mounting: Four bench mounting holes located hydraulic pump containing a manifold which is in base for positive mounting to any level pressurized during operation.
Integral to the pump is a surface. One connection to the assemblies provide vertical calibration manifold has a straight pipe with a precision test gauge capability for back and lower connected attached serving as the reference standard. A second gauges. Incorporated into the manifold is a hand Operating Fluid: D — Light grade machine operated displacement valve that allows small oils, auto- motive petroleum base SAE 20 oils adjustments in fluid volume to be made with- out further operation of the pump handle or release valve.
If a 5, psi 35,kPa range test precision test gauge selected for testing. Certification of gauge were used to test devices whose span values were less test gauge accuracy traceable to the N. Therefore, rings, and special adapter for making connections to it is impor- tant to select a test gauge that has a full scale range pres- sure outlets that do not accommodate cone pipe equal to or only slightly in excess of the pressure value to be seating, are included with each unit.
Test pump accessories include lower and back connection 2. Bourdon tube materials for D and DH are supplied with the complete tester to hold all fittings and bronze and Monel.
Bourdon tube materials for DO are attachments. Pressure produced by the Pump Body: Aluminum, corrosion inhibited and coated with baked pump is equally distributed by the manifold to a test blue epoxy finish.
The reading of the test gauge serves as the reference to Shuttle Valve: Stainless steel bypass valve that controls rate of which other device readings are compared against. Selection of the test gauge range is the determining factor in establishing the precision to which a comparison check Displacement Valve: A fine pitched threaded valve road is to be made.
Test gauge accuracy is expressed as a permitting vernier adjustments to fluid volume to provide precise per- centage of its span. Limit stops prevent road removal during normal operation. Mounting: Four bench mounting holes located in base for DH — Most hydraulic oils of phosphate ester base, positive mounting to any level surface. Depending upon the model and pressure range selected, the total number of weights, weight boxes and piston and cylinder assemblies will vary.
Refer to Specifications, Section 2. Depending upon the model and pressure range selected, the total number and their ranges will vary. Refer to Specifications , Section 2. Damaged merchandise and the packaging materials must be held for inspection by authorized Ashcroft Inc. Disposition of damaged or missing goods will be determined after inspection has been performed on loca- tion, or at the discretion of the manufacturer, at the factory.
Inspection may be waived if circumstances, as judged by the manufacturer, preclude its necessity. Having removed the pump assembly from its carrying case, remove the two plastic shipping plugs. Select a lower connection 64 or back connection 66 off- set pipe and connect to inner pump body outlet as shown in Fig. Remove the reservoir filler plug 35 and fill reservoir with operating fluid.
Gauge Range s Included lbs. Storage space dimensions are larger than actual size of 3. Push the shuttle valve in Each piston and cylinder assembly has a minimum and towards the pump body and continue pumping to the maximum operating range. First, determine what pressure desired test pressure. Open the release valve 37 to vent points need to be measured and select the appropriate the pressure. To check operation pull the shuttle valve assembly. The pressure range of the assem- blies is out- ward, close the release valve and operate the pump shown in Table When priming the pump the high han- dle several times.
When handle resistance is felt, pressure piston and cylinder assembly should be used. The offset pipe 64 or 66 Figure should already be Entrapped air will prevent the pump from operating in the secured in place and the reservoir should contain the high pressure valve position or cause it to achieve only operating fluid refer to Installation Section 3.
Repeat the above bleed procedure as Close the release valve 37 by turning it clockwise and necessary to assure all air is removed.
Once air is open the air vent by loosening the filler plug 35 a few removed the pump will continue to operate without further turns.
The shuttle valve 51 should be pulled outward attention providing the reservoir level is maintained. In this position the high The weight set consists of a selection of various masses volume displacement mode is selected and the pump is that will produce desired pressure increments when oper- self-priming.
Operate the pump handle several times ated with the appropriate piston and cylinder assembly. When pump body outlet. Conversely, when applied to the low pressure between the bottom of the piston and cylinder assembly piston and cylinder assembly the equivalent pressure and the pump body. The piston and facing up and the cylindrical end of it is facing down. Their Thread the high pressure piston and cylinder assembly equivalent pressure value is stamped on the top of the 79 or 67 into the outer body outlet as shown, using the platform.
During normal operation, selected weights are added to Operate the pump handle a few more times until fluid is the plate and piston assembly to equal the desired observed at the end of the offset pipe. Connect the gauge pres- sure value. For purpos- 3. If a The unit may be leveled by placing a bubble type level on lower range device must be used, extreme care must be top of the piston plate and revolving it slowly.
Shims may exercised to avoid overpressuring its pressure element. The unit is level when the position of the bubble adapter does not change within the glass as it is rotated on top of 62 and adapter 60 until the coned end of the pipe is the piston assembly. If necessary, rotate the device for view- ing by loosening nut adapter 62 , set it to the 3. Add weight to the piston plate to give desired calibrating pressure. Again, operate the pump handle a few more times.
After a few strokes positive pressure will develop and the pump Pull the shuttle valve 51 outward from the body and handle will begin to resist pumping action. Raise the close the pressure release valve Operate the pump pump handle to its uppermost travel position.
Loosen the handle until the fluid pressure forces the piston to raise bleed screw 30 a half turn counter clockwise and slowly the weights. When pumping, the weights should be oper- ate the pump handle through a downward stroke rotated slowly to decrease cylinder wall friction. If pump until fluid flows steadily from the bleed vent. Close the handle resistance is difficult and the weights have not bleed screw just prior to completing the downward handle risen, push the shuttle valve inward and continue motion.
With the shuttle valve pushed in, the fluid Repeat this action until no air bubbles are observed in the displacement of each stroke is reduced, thereby requiring fluid flow.
Note — the bleed screw must be closed when less effort to continue pumping. Small adjustments to the piston lift can be made with the pump handle or the displacement valve
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