Search results for query: *

hi overcurrent (51) protection. When we see 100 A 0.3 s. so why we talk about curve, but there is only a point

hi What is the maximum time expected for SSV to close (by de-energize the hydraulic control of actuator) ?

hi to feed a motor when should we use (exemple) 4g70 sqmm instead of 3x70?

hi is there a standard talking about the necessity to add an air tank accumulator for BDV or SDV?

hi the "fc" (coating deterioration factor) is used to find the final current density by using the formula : if = i *fc*A (where "if" is the final current density and "i" the initial value , A is the surface area). my ask is : initial current density is the value of bar surface ?

hi is the DNV RPB401 recommended practice used for offshore only or also for onshore cathodic protection design? I'm thinking about the Coating breakdown factor. Fc=a+b*t is there any sense to use it in underground structures evenly coated (bottom tank ).

hi all In Order to supply a VFD system (400 KW) we should install a power transformer (60 KV / 5.5 KV). my question is : is there special consideration about that transformer regarding to harmonics caused by the VFD ? thanks.

HI what is the standard for the salinity of the distilled water used for batteries?

hi 1-corrosion. 2-errosion. 3?

hi i must feed a pannel with 10 bars gaz from 500 bars (reinjection gaz on well) +(containing hydrates) !! attempts have failed because of problems of freezing and clogging in the pressure reducer. is using reductive cascade can be a solution ? many thanks

hi what is the unite of 104 in the connection dimention of this choke : 3 1/8" x 104 ?

hi whay air compressor tank is important, what is the volume needed?

at some periode of the day the voltage produced by the solar pannel is lower than the battery voltage , at other periode the voltage is more bigger. why not using DC/DC tranformer to optimise the charging of battery regardless the solar pannel voltage?

hi a 50 KW asynchronous motor needs a 7 to 10 times that power to start(direct start) . if we need to use a diesel generator we will need to 450 to 600 KVA !!

hi what is the difference in use between these two ball valves : 1- 6"x4" ANSI 600 2-6" ANSI 600 whene using one and not the other.? many thaks

hi i saw two electrical schemas of solar energy system, the using of varistor is systematic. why?

hi is there a specific type of grease for the lubrication of ball valves? thanks

have all 3" 600 RJ x 4" 150 RF safety valve the same dimensions, in order to install another in the same place.?

hi is it mandatory (whene purchasing) to require the flange to be marked , i mean on the body (size, class pressur..)?

hi i'm looking for some procedures for the test of ssv and sssv for oil and gas wells.