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  • Users: jmalter
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  1. jmalter

    SCADA Radio 300 - 360 MHz

    Is there such a thing? This is an unusual frequency range but I've been asked to provide a system in this range. Do you know of any manufacturers making radios in this frequency range? Our project is in the Middle East.
  2. jmalter

    CAT5 in Hazardous Areas

    We need to run some Cat5 TSP cable through a Class 1 Div 2 area on cable tray. The cable is just passing through the area. The cables enter and the room through sealed conduits. Can we use plenum rated cable? or do we need to run the cable is treaded conduit throughout the room?
  3. jmalter

    Block Valve for Crude Oil Pipeline

    What type of valves are typically used as block valves for crude oil pipelines? The few pipelines I've worked with have rising stem gate valves. we are looking to replace a number of existing gate valves on a line and have found the best pricing is for a ball valve. I'm hesitate to recommend...
  4. jmalter

    Crude Oil Quality

    I'm working with a control system for a crude oil pipeline and I'm interested in the amount of particles in the oil. We will be recirculating the oil around the pumps thorugh a control valve and therefore will have a high pressure drop (1440 psi discharge, 35 psi suction). Some of the control...
  5. jmalter

    Meter Skid - Gate or Ball Valves

    What is the current practice for valves on a metering skid for crude oil, ansi 600, 4"? Gate valves are avialable in API 6D, are less expensive then ball valves, and seem "off the shelve". Am I missing something?
  6. jmalter

    Topicalization Specifications

    We are designing electrical and control systems for installation in the Amazon and other tropical environments. These are for unmanned stations that will have crude shipping container type buildings housing PLC control panel, telecommunications equipment, batteries for solar power system. We...
  7. jmalter

    Valve Position Switches

    I'm trying to retrofit some old manual Grove gate valves (4" and 8") with some position limit switches. We only require the open and close position and nothing in between. These are manual valves and they do not require an accuator. There is a screw shaft that extends out of the...
  8. jmalter

    Crude Oil Control Valves

    I'm looking for vendors of control valves for a recirculation line for a crude oil pump station. The line is 4" and is from the pump discharge (1400 psi) to the pump suction (35 psi). Are some manufactures better for crude oil under these conditions? We are looking at the regular...
  9. jmalter

    Viscosity Measurement

    I read in a recent Control magazine (April 2003) that it is possible to calculate viscosity of a fluid by using a coriolis flowmeter and differential pressure. Does anyone have experience doing this and is it possible with crude oil? Thanks in advance. Joe Malter

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