We are doing a project for petrochemical plant. For air compressors we have received one bid for integrally geared centrifugal compressors. The mfr. has offered the unit with magnetic bearings.
Does anyone has experience of magnetic bearings? How reliable are they. Literature found does mention...
One correction in my post first... Nm3/hr is SCFM since we are using US units. In SI it would be Nm3/hr.
Altitude aspect is adding to complexity.
With all explanation how do I check if vendor proposed model which is based on FAD suitable for my requirements which are specified in SCFM (or Nm3/hr).
Rotaryw,
I suppose FAD concept is applicable only to air compressors and not process compressors handling CO2 etc.
ACFM would be specified at site inlet temp. and inlet pressure (inlet pressure wud be atmospheric pressure at site).
How are FAD and ACFM related to each other?
Pump manufacturers do have different pump family curves for 50 Hz and 60Hz. As some members said hydrauic as well as mechanical aspects for pump design are to be checked.
But then how do OEMs do testing for pumps which are manufactured for say Singapore with 50Hz frequency but the pumps being...
Hi everybody,
This may have become monotonous discussion but I am not clear about the same so posting it.
My understanding is for compressors, capacity is specified in Nm3/hr say 500Nm3/hr. This capacity is defined at discharge of compressor package.
to size the compressor, 500 Nm3/hr wud be...
Thanks for all responses.
As MikeHalloran mentioned my question is about lifting as well as moving the trolley along hoist beam with suspended load.
I see one exp. from racookpe1978 wherein a huge load can be moved by a single person lifting as well as moving horizontally.
OSHA puts some...
Dougt115 thanks... conversion mistake. it should be 60 lbs. I suppose more than 60lbs would be an issue. Are you aware of any OSHA guideline or if standard practices wherein the pull force is limited to say 60 lbs or so.
For items which require infrequent maintenance, can manual trolley hoist be suitable for lifting weight of more than 3 ton? My concern is the pull force required for manual trolleys. For capacities more than 3 ton, the force required is more than 30kg (~15 pound).
With increased force, do...
Torsional analysis is done for complete train. All the inertias are modelled as discs and then the analysis is carried out.
Common method to carry out is Holzer method. In this method arbitary vibration of radian is assigned to an extreme disk and the torque required to achieve these vibrations...
Which of the lubricator system is better? Divider block or pump to point lubrication?
I came across some literature that divider block is difficult to field adjust to control the different proportion of the flow. If it is difficult to adjust in the field it may not be maintenance/ operation...
