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Through rotating Engg fraternity, we came to know that some modifications / upgradations have been incorporated in vorecon after some incident at an installation somewhere in Thailand. Can some one throw some light on these modifications/upgradations? We are working on a project proposal with...

As a general observation in multistage reciprocating compressor (API 618), pressure ratio of initial stage (low pressure stages) is higher compare to final stage (high pressure stage). e.g. for 2-stage compressor, pressure ratio for 1st stage is 1.9 and pressure ratio of 2nd stage is 1.5. Why?

What is the significance of Amplification Factor (AF) for Centrifugal Compressor (API 617)? In one of the project specification, we came across the requirement of AF less than 14. How does AF affect the machine behaviour / design?

I would like to know following for Liq. Sulfur Transfer Pumps in parallel operation: 1. If three pumps in liquid sulfur service with PT of 130 Deg.C and Sp. Gr. @ PT as 1.5 gm/cc, are working in 2W+1S configuration taking suction from a common header (not sump) from an atmospheric pressure...

This is regarding required balance grade for couplings. Please explain the relationship between ISO 1940 and AGMA 9000 balance grades. In case ISO balance grade (say 6.3) and AGMA 9000 balance grade (Cl 9) both are specified, which one is stringent.

Please advice whether Seal plan 62 (steam quench) scheme can have Restriction Orifice for reduction of available steam header pressure to required pressure for quench.

I have to finalize pump model for Vessel mounted Vertical pumps - VS4 type. The vessel has boot with dimensions such that minimum submergence requirement for pump shall be maintained within boot. The applicable project specification call for NPSH (A-R) of >= 1.0m. The suction pressure for the...

please explain the relationship between ISO balance grades and grades specified in API 610 (such as 4W/N,4W/N etc W - mass of rotor, N- RPM). In API 610 it mentioned as a note that 4W/N is equivalent to ISO 1940 Gr 1.0. Also that the grades mentioned in API are mid values of the range of the...

Dear Biginch, I have found out the minimum pressure that the pump will see it is 145 bar and the power corresponding to this point is 950 kW Now at rated pt power is 917 kw, that means as per project standards the minimum motor rating required is 1.1 X 917 = 1008 kW Can i select mator rating...

We are engineering a BFW multistage pump (8 stages) being supplied from reputed pump manufacturer alongwith ARC valve (to be supplied by Pump Manufacturer). At the time of pump ordering, Back pressure regulator (to be mounted in Pump min. continuous flow line) was included in Pump Manufacturer's...

We are engineering a BFW multistage pump (8 stages) being supplied from reputed pump manufacturer alongwith ARC valve (to be supplied by Pump Manufacturer). They have indicated Pump min. Thermal continuous flow of 52.5 m3/hr and Pump min. Stable continuous flow of 63 m3/hr in the Pump datasheet...

Please explain the difference between GD² vaue and Moment of inertia of pump. Whts the improtance of both the values in selection of motor for pump??

Dear Scipio, Thanks for he useful information. I would like to eloborate few more things point 1. There r 2 pumps 1 working and 1 standby (not in parallel operation anytime) point 2. Standby pump shall autostart as soon as the working pumps trips - due to some reason. it has auto...

I am facing a Problem in selection of Motor rating for High pressure ~150 bar boiler feed water pump. the pump requires Autostart facility i.e. its discharge valve will be in open condition at time of starting and also it has an Auto Recirculation Valve (ARC) in discharge line for minimum flow...