For the coker unit feed pump, as per licensor document the seal flush plan is 11,52. The service fluid temperature is 200 deg C ( normal) and (max) 260 deg C. One seal vendor offer the same seal flush plan as indicated where as the other seal vendor offers 23,52. It is obvious that since the...
Thank U JJ. Will follow the advice of Flexibox. Thanks Flexibox. But can we not use 32,52 seal flush plan. 32 seal flushing liquid is like what JJ indicated.
JJ, with regard to warm up arrangement vendors have quoted for Overhanging type Pump (OH2 type) and hence they are not requiring any...
Is API 675 is applicable for Air operated diaphragm pumps which are used for transferring chemicals. (Capacity 7 m3/hr and discharge pressure 2 bar). If API 675 is not applicable then which standard would be applicable”.
Thanks to clarify
Sorry flexibox I have not made the point clear. JJ had striked it . Yes I am asking about the steam letting it through the stuffing box jacket which vendor is saying that for service temperatures above 260 deg C, they recommend this steam jacketting where the LP steam has to be used and they...
We have three (3x50%) Water injection pumps & each pumps are connected with individual booster pump (3X50%) . Booster pump A supplies water to Injection pump A. Similarly booster pump B supplies water to injection pump B. And similarly C.
The injection pumps are multi stage centrifugal API...
For the process pumps in a refinery, where high temperature process fluids are used ( 260 deg C and upto 340 Deg C) , one of the pump vendor is requiring LP steam quenching in the stuffing box in their design and claims that this will reduce the heat soak for better life of the mechanical seal...
Thanks to all for your replies. The injection pumps are Between bearing centrifugal pumps and the Booster pumps are Overhanging pumps. Will provide all other details once I go to office later today.
There are three water injection pumps ( 2 running + 1 standby) for the oil well and each injection pump suction is fed by an independent booster pump to take care of NPSH requirements.Should there be any reason to have independent booster pump for each injection pump? Why not to have a common...
For one of the charge pumps in a refinery plant, as per the licensor P&ID, the line size is 12 inches where as the pump offered by the vendors is 6" suction and 6" discharge ( TOP-TOP). Can there be so much difference between the suction line and the suction nozzle size selected by the pump...
For a Coker Heater CHarge pump , vendors are offering different grades of material. For example for the pump shaft one vendor is offering Material ASTM A 276-431 whereas the other vendor is offering ASTM A 276 type 410. Similarly for the Shaft sleeve one vendor is offering ASTM A 276-431 and...
Thanks Biginch and JJ. My query is for a Heater charge pump in a delayed coker unit where there are two pumps . One supplier pump absorbed power is 100 kW more than the other and thereby the pump efficiency is 15% lower . The NPSHmargin for the lower absorbed power supplier is less than 1.8...
Thank U flexibox for your reply. Pl clarify as I am still not clear.
As per API 682 for pressurised seals (Arrangement 3) three face orientations are provided for contacting wet type seals viz 3CW-FB: the face to back or tandem arrangement due to the arrangement of seals in series, 3CW-BB ...
When 3 or 4 vendors are technically acceptable , and when we are asked to rank the vendors , it strikes me only the Rated power of the offered pump and the similar supply to other users . Thanks to clarify what are the other such factors to be considered which are critical from the aspect of...
I would like to know the basis for selecting a seal type. For example, when we specify seal flush plan 53B, on what basis the vendors select Face to Back , Face to Face or Back to Back . What are the factors to be considered for each type?
As a user , how to check whether the selection by the...
