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...
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
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...
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...
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...
One of the Lube oil heat exchanger tubes material is Admiralty brass. We are planning to use cooling water having chloride of 350 ppm. Whether admiralty brass can be used for the above cooling water quality? Whether temperature rise in the cooling water will have any effect in the admiralty...
One of the Client specification says that the lube oil system ( as per API 614 Chapter3) shall be completely in Stainless steel ( cooler shell, tubes , tube sheet, filter housing valves, pipelines etc). The reason for asking SS410 cooler tubes is said that the cooling water have about 350 ppm of...
We are in the process of evaluating the offers for the coker heater charge pumps. The MOC of the pumps are complying to C-6 material ( 12% Chrome). Vendors have offered 500-525 KW motors and the pumps are installed with antifriction bearings . The pumps are BB2 type with double volute and one...
In one of the process document it has been indicated that the copper and the copper added alloys shall not be used in Wet H2s environment.One vendor has quoted for 17-4PH material for the shaft sleeve which contains 4 % copper. Why cu shall not be used for H2S environment. Thanks to clarify
For selecting Instruments for a dusty atmosphere ( coke drum area),the hazardous area classification says it is zone 22 where as the vendor supplying the instruments to suit Zone 2. Vendor claims that Zone 2 ( fit for gases) is sufficient enough for this. Thanks to clarify,the statement by the...
In one of the pump data sheet , it has been indicated that the "Reacceleration of Motors to be provided for this pump. What exactly it mean. Is it the design aspect of the motor or a separate electronic control system to be built in to the power system for the motor supply? Any precautions to be...
When Flow and Diff Head is given, what are all the factors to be considered to decide , the pump shall be Overhung or Between bearing pumps. Are there any thumbrule that after certain flow and Diff head , we necessarily have to go from overhung to Between bearing pumps. Is this type is vendor...
For one of the pump ( BB2 type), handling diesel, the seal flush plan recommended by the seal vendor is 11,65,72.The max suction pressure is 4.5 bar and the working temp is 139 Deg C ( Flash point is 120 Deg C). The vapour pressure is 0.07 bar.
My question here is , what is the criteria to...
For one of the Turbine - Gearbox- Fractionator pump , we are insisting for Inpro bearing isolators for the gearbox. The pump runs at 1485 rpm and the High speed side of the gearbox is 5300 rpm. Forced lubrication system for the bearings are applied for gearbox and the turbine bearings.
Gearbox...
A 53B seal flush system is provided with a PSV . I have come across a TRV in the cooling water system. But what is the technical reason for having a PSV in the barrier side ?
Similarly for the 53B seal system , whether the accumulator and the cooler has to be designed for the process liquid...
One of the Pump in a refinery plant, is to be selected for operating at Higher suction pressure ( More than 25 bar). What are the precautions / check to be considered while selecting the pump, seal and the Motor power? Thanks to clarify.
For one of the Boiler ( of capacity 70T/Hr), the Trisoidum phosphate dosing pump capacity is calculated by the boiler vendor based on the 100% evaporation rate + the Blowdown rate. After arriving at the phosphate dosing rate as above , the vendor doubles the above value x 2 considering the 100%...
