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Primary pressure standard: Deadweight Tester CPB5000
for high precision pressure calibration of pressure gauges, pressure transmitters, pressure switches etc.
Ranges:
- pneumatic from 0.03 to 100 bar
- hydraulic from 0.2 to 4000 bar
Accuracy up to ±0.010% of READING
With integrated priming pump and spindle pump.
Piston-/cylinder-system changeable without tools
Units under test to be mounted by hand without tools
OPTION: Intelligent Calibration Module type IKM
The IKM calculates automatically the needed corrections caused by ambient influences, deviation between computed pressure and real weight of the masses, conversion to other pressure units like PSI, KG/cm² and much more. The IKM shows the user which masses to be placed on the piston to get the requested pressure, and much more...
NEW: Type LDW 1000, low-cost, hydraulic up to 1000 bar / 14500 psi, accuracy ±0.025% of measured value / reading.
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The MPA series is a co-design between SCANDURA & FEM and the I.N.RI.M (Italian National Research Institute of Metrology) with the objective to develop a series of pressure balances operating in liquid media up to 120 MPa.
Two different product lines are available: BLUE and RED
Here below main features of the RED LINE are listed:
- expanded uncertainty up to 0,008% rdg
- liquid media
- different ranges up to 1200 bar
- interchangeability: MPA chassis can be used with any piston-cylinder unit and same mass set
- industrial applications
- easily transportable
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The MPA series is a co-design between SCANDURA & FEM and the I.N.RI.M (Italian National Research Institute of Metrology) with the objective to develop a series of pressure balances operating in liquid media up to 120 MPa.
Two different product lines are available: BLUE and RED
Here below main features of BLUE LINE are listed:
- expanded uncertainty up to 0,005% rdg
- liquid media
- different ranges up to 1200 bar
- built in Electronic Card for the errors calculations and the measurement of the ambient parameters
- automatic motor rotation drive system for the masses
- digital mass identification system through bar-code
- Interchangeability: MPA chassis can be used with any piston-cylinder unit and same mass set
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Air reference dead-weight tester BL1R Oil reference dead-weight tester BL1H
Fields:
- Chemical and Petrochemical Industry
- Food and Beverage Industry
- Pharmaceutical and Biotechnical Industry
- Heating, Ventilation and Air Conditioning
- Machine and Process Industry, Power Plants and Distribution, Automotive Industry
Type: BL1R, BL1H
Application: Calibration of pressure monitoring systems
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Earth Pressure Balance Machines (EPBM)
EPBMs are used for high powered pipe jacking with precise control of earth pressure via operator control of the cutterhead with pressure sensors, jacking speed, screw conveyor operation and foam and bentonite slurry additive system for conditioning of spoils. Akkerman manufactures EPBMs for installation of pipe in the 96"-168" OD range.
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If the geology of your tunnel ranges from soft soils to weathered rock, then a Robbins Earth Pressure Balance Machine (EPBM) is the correct technical solution for your project. This is particularly true when your project is located in an urban environment and ground surface subsidence cannot be tolerated.
EPBMs are utilized in the construction of rail tunnels, metropolitan subway systems, highway tunnels, and other projects where the tunnel will be constructed either partly or completely in soft soil beneath the water table.
Robbins has integrated over 50 years of TBM design and jobsite experience into our EPBMs. Nobody has a wider range of experience designing innovative machinery to cope with difficult underground conditions. Our engineers will tailor your EPBM to handle the specific challenges of your project. From "Smooth Flow" cutterheads that reduce friction to super-reliable sealing systems and Variable Frequency Cutterhead Drives, Robbins has taken the traditional EPB design to the next level.
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Earth pressure balance tunnel boring machines
Historically, EPBs were developed in order to do away with the mucking system and the reprocessing of boring slurry. To do this, the soil must ideally consist of fine elements (clay and silt) and natural water. This type of mix is rare, which is why foams were developed.
Basic principle
The earth pressure balance tunnel boring machine or EPB consists of a cutting chamber located behind the cutterhead. This chamber is used to mix the soil + water foam. It is maintained under pressure by the mucking system. The system consists of a screw conveyor whose speed is controlled so that constant pressure inside the chamber is guaranteed. The material exits the screw conveyor via a hatch that can be closed when the TBM is shut down. The material is then removed by a belt conveyor and/or train cars circulating in the tunnel.
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Slurry shield tunnel boring machines
Bentonite slurry, consisting of a specific clay and water mixture is universally used in boring and digging operations. The slurry has numerous properties: sealing of the cutting face, reduced friction on the TBM's structure, and transport of cuttings to the separation plant outside the tunnel.
The basic principle of this TBM is to maintain the tunnel's cutting face during the excavation phase by filling the working chamber, located behind the cutterhead, with slurry.
Slurry pressure is carefully controlled by a large air bubble which is maintained by a separately-controlled air supply system. This air bubble acts as a damper by absorbing sudden variations in mucking output.
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Herrenknecht Earth Pressure Balance (EPB) Shields are in their element in soft ground. Cohesive and incohesive soils with high clay or silt content and low water permeability provide the ideal conditions for EPB tunnelling.
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