www.thepetrosolutions.com | Nasir Hussain | Activity https://thepetrosolutions.com/members/admin/activity/ Activity feed for Nasir Hussain. Fri, 24 Apr 2026 15:54:47 +0000 https://buddypress.org/?v= en-US 30 hourly 2 ca98bbcff8fb9a7990fb2c78c15c33bf Nasir Hussain replied to the topic Designing of Fired Heater in the forum Engineering Students https://thepetrosolutions.com/forums/topic/designing-of-fired-heater/#post-5431 Sun, 13 Jul 2025 10:13:41 +0000

Fired Heater in Refinery: Design, Safety, and Optimization

]]> 0 1b1de602f929d9c73411ad1795771f32 Nasir Hussain started the topic What is the difference between reliability and integrity? in the forum Health Safety and Environment https:/forums/topic/what-is-the-difference-between-reliability-and-integrity/ Thu, 06 Mar 2025 19:58:54 +0000 In functional safety, ‘reliability’ is a mathematical term expressing the probability that the SIF has not suffered a random hardware failure.
However, control of systematic failures is also necessary. The term ‘integrity’ expresses the degree of confidence that both random and systematic failures are adequately controlled. Thus, the term ‘SIL’ (…Read more

]]> 0 32f637427d8dd0da33f9295efc2bbcfc Nasir Hussain started the topic Meaning of Reliability Term in the forum Health Safety and Environment https:/forums/topic/meaning-of-reliability-term/ Sun, 02 Feb 2025 03:24:10 +0000 Reliability—A measure of successful operation for a specified interval of time. Reliability, R(t), is defined as “the probability that a system will perform its intended function when required to do so if operated within its specified limits for a specified operating time interval.” The definition
includes five important aspects.
1. The syste…Read more

]]> 0 463203fee80e12bab82da93c561a49a7 Nasir Hussain started the topic Hardware Safety Integrity Architectural Contraints in the forum Health Safety and Environment https:/forums/topic/hardware-safety-integrity-architectural-contraints/ Sun, 26 Jan 2025 10:55:49 +0000 In the context of hardware safety integrity, the highest safety integrity level that can be
claimed for a safety function is limited by the hardware safety integrity constraints which shall
be achieved by implementing one of two possible routes (to be implemented at system or
subsystem level):
– Route 1H based on hardware fault tolerance and s…Read more

]]> 0 700ae6275ea5a58ded2988022a99be35 Nasir Hussain started the topic Black-box functionality testing in the forum Health Safety and Environment https:/forums/topic/black-box-functionality-testing/ Sun, 12 Jan 2025 07:05:32 +0000 Black-box functionality testing is a test design method that treats the system as a “black box”, so it
does not explicitly use knowledge of its internal structure. Black- box test design is usually described as
focusing on testing function requirements. Synonyms for black box include behavioural, functional, opaquebox,
and closed-box testing

]]> 0 8ccdf62450b73b9e5e46a46f2504bf94 Nasir Hussain started the topic Fixed program language FPL in the forum Health Safety and Environment https:/forums/topic/fixed-program-language-fpl/ Sat, 11 Jan 2025 15:18:13 +0000 fixed program language
FPL
Language in which the user is limited to adjustment of a few pre-defined and fixed set of parameters. Typical examples of device applications with FPL are: smart sensor (e.g., pressure transmitter without control algorithms), smart final element (e.g. valve without control algorithms), sequence of events
recorder

]]> 0 52df5b874dd3a29e5f5f74c41522f8e2 Nasir Hussain started the topic Limited variability language LVL in the forum Health Safety and Environment https:/forums/topic/limited-variability-language-lvl/ Sat, 11 Jan 2025 12:51:00 +0000 limited variability language
LVL
programming language for commercial and industrial programmable electronic controllers with a range of capabilities limited to their application as defined by the associated safety manual.
This type of language is designed to be easily understood by process sector users, and provides the capability to combine…Read more

]]> 0 8f567528a28a6e75623946ac41f8bd58 Nasir Hussain started the topic Full Variability Language (FVL) in the forum Health Safety and Environment https:/forums/topic/full-variability-language-fvl/ Sat, 11 Jan 2025 12:48:06 +0000 full variability language
FVL
language designed to be comprehensible to computer programmers and that provides the
capability to implement a wide variety of functions and applications
Note 1 to entry: Typical example of systems using FVL are general purpose computers.
Note 2 to entry: In the process sector, FVL is found in embedded software and…Read more

]]> 0 841b931eb7e249018374605eed80a155 Nasir Hussain started the topic List of Abbreviations Used in IEC 61511 in the forum Health Safety and Environment https:/forums/topic/list-of-abbreviations-used-in-iec-61511/ Fri, 10 Jan 2025 15:14:05 +0000 AC/DC: Alternating current/direct current
AIChE: American Institute of Chemical Engineers
ALARP: As low as reasonably practicable
ANSI: American National Standards Institute
AP: Application program
BPCS: Basic process control system
CCPS: Centre for Chemical Process Safety (AIChE)
DC: Diagnostic coverage
E/E/PE: Electrical/electronic/programmable…Read more

]]> 0 78d748639e26ddcacd442915429dca58 Nasir Hussain started the topic Relationship of Fault Tree and Event Tree with Bow Tie in the forum Health Safety and Environment https:/forums/topic/relationship-of-fault-tree-and-event-tree-with-bow-tie/ Thu, 02 Jan 2025 03:23:58 +0000 How the Bow Tie Diagram incorporate both Fault Tree and Event Tree analysis, here is the explaination?
A bow-tie diagram consists of two parts: the pre-event (left) and post-event (right) sides. The left side, resembling a fault tree, outlines how initiating events can escalate through preventative safeguards to an incident. The right side,…Read more

]]> 0 df08cb92537876b1023bc1504f5947f2 Nasir Hussain replied to the topic Hydrogen Purity during Sulfiding of Hydrotreating Catalyst in the forum Hydroprocessing https:/forums/topic/sulfiding/#post-4647 Sat, 14 Dec 2024 03:57:17 +0000 Therefore, it is better to take Hydrogen or makeup gas from high purity source. Pressure Swing Adsorption (PSA) unit or direst from Platforming unit can be the possible sources with more than 90 %, hydrogen purity.
For further details of Sulfiding please view the blog ” https:/sulfiding-hydrotreating-catalysts/”

]]> 0 29d4b203779a70212dcc9166f1dc28a1 Nasir Hussain started the topic Risk Receptor Meaning in the forum Health Safety and Environment https:/forums/topic/risk-receptor-meaning-2/ Wed, 06 Nov 2024 07:08:39 +0000 A risk receptor refers to an entity (such as a person, environment, or asset) that could be negatively affected by potential hazards or failures in a system. In other words, it’s the element exposed to risk due to potential system faults or unsafe conditions. The concept of a risk receptor helps identify the specific targets of safety measures, a…Read more

]]> 0 8b8977c062a57c666bc09906d26f4a58 Nasir Hussain started the topic Risk Receptor Meaning in the forum Health Safety and Environment https:/forums/topic/risk-receptor-meaning/ Wed, 06 Nov 2024 07:08:38 +0000 A risk receptor refers to an entity (such as a person, environment, or asset) that could be negatively affected by potential hazards or failures in a system. In other words, it’s the element exposed to risk due to potential system faults or unsafe conditions. The concept of a risk receptor helps identify the specific targets of safety measures, a…Read more

]]> 0 db88095a2c352a00ebf7c0ed5dbf2067 Nasir Hussain started the topic What is mission time in functional safety and reliability engineering? in the forum Health Safety and Environment https:/forums/topic/what-is-mission-time-in-reliability-engineering/ Sun, 22 Sep 2024 16:08:03 +0000 In reliability engineering, mission time refers to the period during which a system, component, or device is expected to operate without failure under specified conditions. It is the total duration or time interval over which the performance of the system is evaluated for reliability.

Mission time is crucial in determining failure rates and…Read more

]]> 0 0fc78efc655b7ee575d1c1e0e88553b1 Nasir Hussain started the topic Documents required for HAZOP Study in the forum Health Safety and Environment https:/forums/topic/documents-required-for-hazop-study/ Wed, 10 Jan 2024 20:44:10 +0000 Following project documents are reburied for HAZOP Study and Hazop Team leader should thoroughly review the these before starting the HAZOP Study.
It should include Project Design Basis, Process Description, Process Flow Diagrams, Plot Plans, Engineering line drawings or P&IDs,  Cause & Effect Diagrams,
Area Classification drawings, material sa…Read more

]]> 0 2d6aef6f6cc082514863bbd56910d33c Nasir Hussain started the topic Meaning of Blowout in Fired Heaters in the forum Process Operations https:/forums/topic/meaning-of-blowout-in-fired-heaters/ Sun, 26 Nov 2023 21:32:51 +0000 What does mean by the term “Blowout” in the Process heaters or furnace?
Blowout is the condition where the firebox of a furnace is positive in pressure to the point that if a observation port is opened fire will blow out the port instead of air being drawn inside. This condition can result in the injury of personnel and damage to operating…Read more

]]> 0 7d818901bb9befe43be2245f8bf528e9 Nasir Hussain started the topic What is on-stream factor in process units, oil refinery and petrochemical in the forum Process Operations https:/forums/topic/what-is-on-stream-factor-in-process-units-oil-refinery-and-petrochemical/ Sun, 17 Sep 2023 15:27:50 +0000 Meaning of onstream-factor
It is the ratio of the number of operating days to the number of calendar days per year, the process unit remained available for production.
On stream factor is in important parameter to check the performance of the process unit with respect to plant reliability. Greater, the onstream factor more is the plant reliable…Read more

]]> 0 01914fe43cc2c071634b188c9544a3be Nasir Hussain started the topic What is Sensitization Effect in Stainless Steels ? in the forum Maintenance https:/forums/topic/what-is-sensitization-effect-in-stainless-steels/ Sat, 09 Sep 2023 04:18:42 +0000 Sensitization effect
Sensitization refers to the precipitation of carbides at grain boundaries in stainless steel or alloy, causing the steel or alloy to be susceptible to intergranular corrosion or intergranular s
Certain alloys when exposed to a temperature characterized as a sensitizing temperature become particularly susceptible to…Read more

]]> 0 ff25febb21dd6a657be9512f7520f306 Nasir Hussain started the topic Hydrogen Purity during Sulfiding of Hydrotreating Catalyst in the forum Hydroprocessing https:/forums/topic/sulfiding/ Fri, 08 Sep 2023 13:11:45 +0000 what happens if the hydrogen is lower than the target value during the Sulfiding Procedure of Hydroprocessing catalyts? And what if it is upper?
Answer:
High purity of hydrogen gas means fast reactions of sulfiding and more water is produced in the boot as a result sulfiding will be completed in less time. But during high-purity gas, H2S should…Read more

]]> 0 5d0e822f4758ae38fd3f2ba7e0b6c51d Nasir Hussain started the topic Meaning of Terms Localized Corrosion and Corrosion Erosion in the forum Maintenance https:/forums/topic/meaning-of-terms-localized-corrosion-and-corrosion-erosion/ Fri, 18 Aug 2023 06:00:06 +0000 The term “Localized Corrosion” is described as a category of corrosion phenomena (e.g., pitting, crevice corrosion, corrosion or stress corrosion cracking) and corrosion that has been confined to a small area of the corroding surface at a specific location in the process equipment.
It is commonly understood that fluid velocity induces acc…Read more

]]> 0 285b7439e752f6545258da0b1760097e Nasir Hussain replied to the topic Temperatures and LHSV at Naphtha Hydrotreater Reactor in the forum Process Operations https:/forums/topic/naphtha-hydrotreater/#post-3542 Sat, 15 Jul 2023 21:09:59 +0000 Theoretically you can can calculate either of the one parameter if you know the other 3 parameters but reactor inlet temperature at LHSV2 is adjusted according to the product quality requirement. The actual temperature might not be the same as theoretical. Normally, when feed rates to reactor are adjusted the reactor inlet temperature does no go…Read more

]]> 0 e9e078bf64755eed0323a3f3ef13e9a6 Nasir Hussain replied to the topic Temperatures and LHSV at Naphtha Hydrotreater Reactor in the forum Process Operations https:/forums/topic/naphtha-hydrotreater/#post-3530 Fri, 14 Jul 2023 00:48:08 +0000 LHSV is the liquid hourly space velocity, which is the ratio of liquid volume flow per hour to catalyst volume. LHSV is inversely proportional to residence time. As the flow rate increases, the LHSV increases. In most systems with a fixed catalyst volume & activity, temperature is increased to offset the negative reaction consequences of…Read more

]]> 0 3a1a3869d0dae67d677caab4c5273063 Nasir Hussain started the topic Difference between Oleophobic and Oleophilic Impurities in the forum Process Operations https:/forums/topic/difference-between-oleophobic-and-oleophilic-impurities/ Wed, 31 May 2023 00:06:15 +0000 The two types of impurities preset in crude oil. The impurities which can be removed by electrical desalting are called as “Oleophobic” means lacking an affinity for oil. Oleophobic constituents are insoluble in crude oil and are present as a second phase, being carried as discrete particles by the oil.
Examples of Oleophobic Impurities in crude…Read more

]]> 0 d72f5c3f95d94f53bc0cb550a276b9b4 Nasir Hussain started the topic What us Deadweight Tonnage or Tons Deadweight? in the forum Process Operations https:/forums/topic/what-us-deadweight-tonnage-or-tons-deadweight/ Tue, 21 Mar 2023 16:05:13 +0000 Deadweight tonnage or tons deadweight (DWT) is a measure of how much weight a ship can carry. It is the sum of the weights of cargo, fuel, fresh water, ballast water, provisions, passengers, and crew.

]]> 0 9e044e9d8eef164748b04bee8e91f61a Nasir Hussain started the topic Primary Distillation Capacity and Secondary Conversion Capacity in the forum Process Operations https:/forums/topic/primary-distillation-and-secondary-conversion-capacity-of-petroleum-refinery/ Sun, 06 Nov 2022 06:36:28 +0000 Primary Distillation Capacity
A distillation column separates crude oil into different petroleum products based on differences in boiling points this is called Primary Distillation capacity. By itself the crude distillation column has low yields of high-value transportation fuel products.
Secondary Conversion Capacity
Many of the other chemical p…Read more

]]> 0 a0055281106487f3e496f2633ff9ad92 Nasir Hussain started the topic What is the difference between Hydrotreating and Hydrocracking? in the forum Hydroprocessing https:/forums/topic/what-is-the-difference-between-hydrotreating-and-hydrocracking/ Mon, 09 May 2022 18:42:18 +0000 1. Hydrocracking is the process of converting high molecular weight Hydrocarbons items (VGO, Vacuum/atmospheric residues, etc.) into more valuable lighter petroleum products like LPG, gasoline, Kerosene, and diesel. While hydrotreating is the process of removing impurities like Sulfur, Nitrogen, Oxygen, metals, chloride, etc. from the petroleum…Read more

]]> 0 29f7002e834afce9bf2c7ba230ec7855 Nasir Hussain started the topic What does mean by Hot Approach Temperature? in the forum Process Operations https:/forums/topic/what-does-mean-by-hot-approach-temperature/ Sat, 07 May 2022 05:04:29 +0000 It is the difference between the temperatures of the hot and cold streams. For example, if you heat a cold fluid from 80°C up to 100°C using a hot fluid at 105°C, the approach temperature of the heat exchanger is 105-100 = 5°C. The lower approach, the higher the heating area.
In the same way as the reactor effluent temperature in the hyd…Read more

]]> 0 d35918fba9b8cb4b625cfe4b1461a25f Nasir Hussain replied to the topic Effects of increase of Hydrogen Partial Pressure in Hydrocracking unit in the forum Hydroprocessing https:/forums/topic/effects-of-increase-of-hydrogen-partial-pressure-in-hydrocracking-unit/#post-2158 Mon, 14 Mar 2022 23:40:09 +0000 Increasing hydrogen partial pressure in a hydrocracker will increase conversion for the same reactor temperatures.
1. Increasing hydrogen partial pressure at constant conversion requires lower reactor temperatures and thus increases the cycle length of the catalyst.
2. The higher partial pressure favors the desired reactions (cracking) and…Read more

]]> 0 0915c9a2a2ed181a2c1e012b2d711bfc Nasir Hussain started the topic Effects of increase of Hydrogen Partial Pressure in Hydrocracking unit in the forum Hydroprocessing https:/forums/topic/effects-of-increase-of-hydrogen-partial-pressure-in-hydrocracking-unit/ Mon, 14 Mar 2022 23:32:47 +0000 What will be the gain in the conversion of the hydrocracking unit if we increase hydrogen partial?

]]> 0 da1e72b8ad7e6253619da8351c1e3657 Nasir Hussain replied to the topic Causes of Foaming in Amine Absorber of Hydrocracking Unit in the forum Hydroprocessing https:/forums/topic/causes-of-foaming-in-amine-absorber-of-hydrocracking-unit/#post-2156 Mon, 14 Mar 2022 23:27:53 +0000 Causes of fouling in HP Amine Absorber of Hydrocracking unit are as follows;
suspended solids, plugged trays, antifoam performance, off-spec inlet gas, hydrocarbons content, corrosion and erosion of metal components, low filtration/separation efficiency.
The most prominent cause of foaming related to the Hydrocakcing unit is the over-cracking of…Read more

]]> 0 41a4c1d25835fdd14a8240ca2a780963 Nasir Hussain started the topic Causes of Foaming in Amine Absorber of Hydrocracking Unit in the forum Hydroprocessing https:/forums/topic/causes-of-foaming-in-amine-absorber-of-hydrocracking-unit/ Mon, 14 Mar 2022 23:20:34 +0000 What can be the possible reason for foaming in the High-Pressure Amine absorber in the Hydrocracker unit?

]]> 0 66cdb53abb9cab885fba85dd8a877413 Nasir Hussain started the topic Types of Oil Refineries in the forum Process Operations https:/forums/topic/types-of-oil-refineries/ Sat, 05 Feb 2022 03:53:25 +0000 There are four types of petroleum oil refineries, depending on the market conditions and country’s regulations.
1- Topping oil refinery, 2- Hydroskimming oil refinery, 3- Conversion oil refinery, 4- Deep conversion oil refinery
1- Topping Oil Refinery
A topping refinery is the simplest refinery configuration that is designed to produce feedstock…Read more

]]> 0 18fe77dbe2e84d7b7a187ede176f3afd Nasir Hussain started the topic What does mean by the term BPSD? in the forum Process Operations https:/forums/topic/what-does-mean-by-the-term-bpsd/ Sun, 19 Dec 2021 03:31:18 +0000 Refinery processing size or capacity usually is measured in terms of crude distillation unit capacity. Common units for refinery capacity measurement are:
BCD – Barrels per Calendar Day, based on 360 days per year, allowing downtime for maintenance, and
BSD – Barrels per Stream Day, i.e. the nameplate or maximum capacity of the refinery.
For ref…Read more

]]> 0 3df44ca5dedef8f551a20d21194e5ec5 Nasir Hussain started the topic Effects of Nitrogen on FCC Catalyst in the forum Process Operations https:/forums/topic/effects-of-nitrogen-on-fcc-feeds/ Thu, 16 Dec 2021 18:06:24 +0000 Nitrogen in the FCC feed refers to organic nitrogen compounds. The nitrogen content of
FCC feed is often reported as basic and total nitrogen. Total nitrogen is the sum of basic
and non-basic nitrogen. Basic nitrogen is about one-fourth to one-half of total nitrogen. Catalyst poisoning from the presence of basic nitrogen in the FCC feedstock is…Read more

]]> 0 cc9c210e47fd868686b8e5bd2a08ce66 Nasir Hussain started the topic What is As Low as Reasonably Practicable? in the forum Health Safety and Environment https:/forums/topic/what-is-as-low-as-reasonably-practicable/ Wed, 15 Dec 2021 16:42:24 +0000 Explain the term ALARP?

]]> 0 c3cbc9ddd213cf2ca8efb02d0b5fab85 Nasir Hussain started the topic FFC Unit Feed Molecular Properties for cracking in the forum Process Operations https:/forums/topic/ffc-unit-feed-molecular-properties-for-cracking/ Sun, 12 Dec 2021 06:38:32 +0000 Paraffinic stocks are easy to crack and normally yield the greatest amount of total liquid products. Normal paraffin will crack mostly to olefin and other paraffin molecules.
These processes include thermal cracking and other catalytic cracking operations. Olefins are not the preferred feedstocks to an FCC unit. This is not because olefins are…Read more

]]> 0 6d46822313891f97ed35ea64e4bbdc1f Nasir Hussain replied to the topic Bypassing diolefins reactor in DHT unit in the forum Hydroprocessing https:/forums/topic/diolefins-reactor-in-dht-unit/#post-1919 Thu, 21 Oct 2021 13:52:29 +0000 I think it is not a good idea to process the cooker Naptha directly in the hydrotreating reactor bypassing the diolefins reactor. Because high olefin content will result in higher catalyst deactivation, higher hydrogen consumption, and a higher temperature rise across the catalyst bed. Further, silicon and high sulfur content will also cause…Read more

]]> 0 5fa96d4b75c6231fd30eb711f58cc1c8 Nasir Hussain started the topic What are Aliphatic hydrocarbons? in the forum Engineering Students https:/forums/topic/what-are-aliphatic-hydrocarbons/ Sun, 12 Sep 2021 02:04:20 +0000 In organic chemistry, hydrocarbons are divided into two classes: aromatic compounds and aliphatic compounds. Aliphatic compounds can be saturated, like hexane, or unsaturated, like hexene and hexyne. Open-chain compounds, whether straight or branched and which contain no rings of any type, are always aliphatic. Cyclic compounds can be aliphatic if…Read more

]]> 0 3ab50cf79e10960b78207ef2c6493b34 Nasir Hussain started the topic What are Olefins? in the forum Engineering Students https:/forums/topic/what-are-olefins/ Sun, 12 Sep 2021 01:33:26 +0000 olefin, also called alkene, is a compound made up of hydrogen and carbon that contains one or more pairs of carbon atoms linked by a double bond. Olefins are examples of unsaturated hydrocarbons (compounds that contain only hydrogen and carbon and at least one double or triple bond). They are classified in either or both of the following ways: (1)…Read more

]]> 0 9d7d2b22174e88f7c934ca9720748521 Nasir Hussain started the topic Amperes spikes in crude oil desalter in the forum Process Operations https:/forums/topic/amperes-spikes-in-crude-oil-desalter/ Fri, 03 Sep 2021 14:35:47 +0000 What are the reasons for sudden ampere spikes in crude oil desalter and what are the control actions?
Reasons of ampere fluctuations in crude oil desalters are;
1. Low dosing rate of demulsifier.
2. More than 6 % of crude oil feed, desalting water/washing water flow to the desalter.
3. High differential pressure across the mixing valve.
4.…Read more

]]> 0 a18a30b5e82d77db3deba2914a55454e Nasir Hussain replied to the topic Pipeline Of Pump in the forum Engineering Students https:/forums/topic/pipeline-of-pump/#post-1656 Tue, 17 Aug 2021 07:45:06 +0000 Diameter of suction pipe is always greater than discharge.

]]> 0 684637e855ba2abf3911742851a809b4 Nasir Hussain replied to the topic WABT changes while Feed Rate changes in hydrotreating unit in the forum Hydroprocessing https:/forums/topic/wabt-changes-while-feed-rate-changes/#post-1604 Mon, 09 Aug 2021 10:26:54 +0000 Further, once the WABT has been adjusted according 2 degree C for 1 % unit load, final adjustment can be done according to the product Sulfur results.
In addition, the the temperature rising rate can be different according to your unit conditions. Means, your rate can be 1~4 degree C according to your plant condition.
Unit, product sulfur online…Read more

]]> 0 8e0e94d10b3fdb7a2175aae264cf27bf Nasir Hussain replied to the topic WABT changes while Feed Rate changes in hydrotreating unit in the forum Hydroprocessing https:/forums/topic/wabt-changes-while-feed-rate-changes/#post-1600 Sun, 08 Aug 2021 03:05:35 +0000 WABT of Diesel Hydrotreating is normally changed keeping in view the Diesel product Sulfur results. There is no fix method/rate to increase or decrease the WABT. Normally, we increase ~2 degree C WABT with 5 % unit load. Again, we can not fix the WABT rate with feed rate because the specifications of feeds and catalyst activity are not always…Read more

]]> 0 df86c85edf9e34d961527d6f512544f0 Nasir Hussain started the topic What is an opportunity crude oil? in the forum Product Quality https:/forums/topic/what-is-an-opportunity-crude-oil/ Tue, 27 Jul 2021 05:54:59 +0000 Heavy and extra heavy crudes are called opportunity crude. These are very cheap due to their very poor quality and provides the opportunity to earn extra profits. These are used along with normal crude oil which has the benefit of being very cheap. But at the same time processing of Opportunity crude is not an easy task may create fouling and…Read more

]]> 0 7b7a919d87d8efa16f55a93e235109f2 Nasir Hussain started the topic WABT or Weight Average Bed Temperature in the forum Hydroprocessing https:/forums/topic/wabt-or-weight-average-bed-temperature/ Tue, 06 Jul 2021 09:22:20 +0000 The weight average bed temperature (WABT) is typically used to compare the relative activity of the catalyst. The actual WABT should be calculated base on the actual catalyst bed weights and the actual bed temp.
The rate of increase in WABT is referred to as the deactivation rate expressed as °C per m3 of feed per kilogram of catalyst, or more…Read more

]]> 0 2f00e5ff41b9225a0fab4d565a1acb2e Nasir Hussain replied to the topic Sulfiding of Diolefins Reactor in Diesel Hydrotreating unit in the forum Hydroprocessing https:/forums/topic/diolefins-reactor-in-diesel-unit/#post-1535 Tue, 29 Jun 2021 14:23:31 +0000 As per my point of view; the di-olefins reactor contains the active type of grading material. You don’t need to sulfide it like the main catalyst. It will require minor Sulfur, which it will pick from the diesel feed at the given operating conditions.
You will continue your sulfiding of the main reactor as per guidelines given by your vendor, the…Read more

]]> 0 d97a3061d3d56af5e19caf8aa4de5f82 Nasir Hussain started the topic Calculating the Amount of DMDS Required to Complete the Sulfiding in the forum Hydroprocessing https:/forums/topic/calculating-the-amount-of-dmds-required-to-complete-the-sulfiding/ Sun, 06 Jun 2021 10:54:20 +0000 The required quantity of Sulfur depends upon the amount of metals present in the catalyst. Calculate the stoichiometric amount of Sulfur needed for sulfiding by these reactions as follows;

Molecular weights are of Tungsten 183.84, Molybdenum 95.95, Oxygen 15.99, Hydrogen 1.0, Nickel 58.69, Sulfur 32, and Cobalt 58.93.
Stoichiometric Calculations of Sulfiding

From the stoichiometric…Read more

]]> 0 366df59588021c942cab9ad3e5183c79 Nasir Hussain replied to the topic Feed Filters Pressure Control in Diesel Hydrotreating Unit in the forum Hydroprocessing https:/forums/topic/feed-filter-outlet-pressure-control/#post-1513 Mon, 31 May 2021 09:57:35 +0000 Normally, differential pressure of feed filters is considered. At high differential pressure > 1.0 Kg/cm2, the feed filters are switched to clean one (Manual) or back washing sequence starts in case of Auto back wash system.
High differential pressure or low pressure at downstream of filters will cause flow restriction, passing of particles…Read more

]]> 0 c6fbb1ebdf63a044d8006f330cd2dd11 Nasir Hussain started the topic What does mean by Mild Hydrocracking? in the forum Hydroprocessing https:/forums/topic/what-does-mean-by-mild-hydrocracking/ Sat, 24 Apr 2021 06:50:35 +0000 Definition of Mild Hdrocraking
The term “mild hydrocracking” implies hydrocracking at mild operating conditions. Mild Hydrocracking is the refining process designed to performs partial hydrocracking only.
It is carried out mostly for producing middle distillates and fuel oils from vacuum distillates, catalytic dewaxing for lube base stock at a p…Read more

]]> 0 3a6cc7079bad98c52ea0fe0861c3b6e0 Nasir Hussain replied to the topic Diesel unit system pressure during sulfiding in the forum Hydroprocessing https:/forums/topic/diesel-unit-system-pressure-during-sulfiding/#post-1459 Sat, 24 Apr 2021 06:33:37 +0000 Operating conditions during sulfiding of hydrotreating catalyst depend upon the catalyst provider guidelines. Each catalyst vendor has its own procedure of sulfiding to ensure maximum performance after sulfiding. There are two reasons to control the pressure below the normal operating pressure.
1. The reactor pressure should never be increased…Read more

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