Q & A > Piping, Tubing and Fittings
Date  Replies
05/07/2020 Q: Our crude fired heater is having trouble with positive draft. The heater is the balanced type. Our initial suspicion was fouling/leaks inside the air preheater. But when the ID fan was stopped, the draft inside the furnace increased even further. Chemical cleaning of the heater radiation zone was performed. The convection bank manway was opened and inspected. No significant clogging was observed during the inspection. Any clues as to what could be the possible reason for this? (4)
02/07/2020 Q: In our catalytic reforming unit, DM water and CCl4 are used as dosing to keep the water and chloride balance within the prescribed limit. Material of both injection lines is stainless steel 304 whereas the main line of the feed (DSN) is carbon steel as per design. Line pressure and temperature of feed line are 24 kg/cm2 and 151deg C and both injection points are connected to the feed line. From a corrosion point of view, if i replace the injection line of DM water & CCl4 with carbon steel pipe will there be any problem ? If no then please give me the reason for using SS 304, or what type corrosion can take place in the injection line for DM water and CCl4?. Currently we are facing some leakage at the elbow weld joint. In addition, when we tried to repair by welding, again a leak/fissure was found just ahead of the welded point. (2)
19/03/2020 Q: What are the best practices to check leaks from flanges? As soap solution is commonly used, what are the specifications of the soap? Any specific brand?  
05/01/2020 Q: The last time we opened the fired heaters of the Platformer units, we noticed lots of dust accumulating on the tubes. We are looking for ways to externally clean the coils online.

Is there a way to do it with our internal resources?

If not, what are the companies that offer this service?

01/01/2020 Q: It is planned to replace the inlet system of the Reformer in a Hydrogen Generation unit with upgraded metallurgy from SS 304 to SS 347. This upgradation is warranted due to an increase in inlet temperature of the Reformer feed (Prereformer is being introduced as a part of a revamp).
We would like to know if anyone has carried out such modification in your hydrogen generation unit.
Please share the details including precautions to be taken.
23/08/2019 Q: What is permissible limit for bending of arbor/wicket coil in CCR box type fire heaters.
23/04/2019 Q: I am doing hydro test in normal galvanized pipe. During hydro test the ambient temperature is 43 degree Celsius. Test pressure is 24 bar and holding time is 1 hour. The problem is when I set pressure in 24 bar after 1 hour of holding time it became 26.5 bar. Pressure increased 2.5 bar. Is there any scientific reason behind increasing 2.5 bar? (1)
31/10/2018 Q: In VDU we are facing problem in HVGO SECTION, that HVGO pump suction strainer periodically choking?
What’s the causes?
26/02/2018 Q: I have been entrusted with the task of assigning line numbers to refinery circuits, not something of which I have any experience or training. Are there any industry standard numbering conventions?  
28/09/2017 Q: What are the criteria for sizing a restriction orifice?  
20/09/2017 Q: Is there any way to clean 80 inch submerged intake seawater in water-free situation? In other words, is it possible to plug both side of 2 km pipe and discharge the encapsulated water? (1)
24/07/2017 Q: We recently received a batch of jet fuel, which test within the refinery indicated was within specification (40 ° Celsius). However,when sent through a pipeline of 45 kilometres to the company's warehouse, and after being allowed an appropriate period of stability, we took homogeneous samples of the tank and found the flash point was was 37.8 Celsius. How has this change occurred? (7)