www.thepetrosolutions.com | Site-Wide Activity https://thepetrosolutions.com/activity/ Activity feed for the entire site. Tue, 14 Apr 2026 20:04:13 +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 fbe928b4af426768db1bf4afe2388d4d ahsan became a registered member https://thepetrosolutions.com/activity/p/3459/ Sun, 30 Mar 2025 09:24:27 +0000 0 d02e57d1e172eedf45cf80eac768e8e7 Gandi Prasetyo became a registered member https://thepetrosolutions.com/activity/p/3458/ Sun, 30 Mar 2025 07:18:48 +0000 0 56616bbd5a6ad0d4a8a21a3a841dba17 Muhammad Sajid became a registered member https://thepetrosolutions.com/activity/p/3457/ Sun, 30 Mar 2025 07:15:01 +0000 0 764e1d178da8386f2adb7398fc4aaf41 rao became a registered member https://thepetrosolutions.com/activity/p/3456/ Sun, 30 Mar 2025 07:14:31 +0000 0 605cc11992ed21cafa81c73e4259cc6b abdul aziz became a registered member https://thepetrosolutions.com/activity/p/3455/ Sun, 30 Mar 2025 07:13:42 +0000 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 3fd803d3f83f1edb1b794cf249491468 gopi became a registered member https://thepetrosolutions.com/activity/p/3321/ Wed, 06 Sep 2023 12:44:23 +0000 0 c8fb32abaff0f049fd55b9253109593a Juan Inga became a registered member https://thepetrosolutions.com/activity/p/3320/ Wed, 06 Sep 2023 12:44:03 +0000 0 eacecee4e5cea2241455189cbac7b46d Ramchandra Raj became a registered member https://thepetrosolutions.com/activity/p/3319/ Wed, 06 Sep 2023 12:42:03 +0000 0 9d3d00dc5f3ca38a51dbb57262833c25 Mervyn Frampton became a registered member https://thepetrosolutions.com/activity/p/3318/ Wed, 06 Sep 2023 12:41:42 +0000 0 012a745606eb4a9537acc462473d8c32 Lee Sook Ling became a registered member https://thepetrosolutions.com/activity/p/3317/ Wed, 06 Sep 2023 12:41:22 +0000 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 b4bae80da3cad8cf4b161fc791bb88aa Hamzaali1999 started the topic Temperatures and LHSV at Naphtha Hydrotreater Reactor in the forum Process Operations https:/forums/topic/naphtha-hydrotreater/ Fri, 14 Jul 2023 00:42:17 +0000 Hello, I hope you all are fine.

My question is,
Is there is any importance of reactor inlet temperature while calculating LHSV ? As in LHSV formula/equation there is no any temperature term. Simply we calculated LHSV as,

LHSV = volume of charge per hour / volume of catalyst

As during operation, the reactor inlet temperature is fixed lets…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 227ece3d062dc79980a4c533f3f501e1 Hamzaali1999 replied to the topic Job roles of a Chemical Engineer in an oil refinery in the forum Career Counseling https:/forums/topic/job-roles-of-a-chemical-engineer-in-an-oil-refinery/#post-2897 Sun, 08 Jan 2023 05:04:57 +0000 1) For an plant operations engineer which skills are in demand nationally and internationally ?
2) What are the basic skills of an plant operation engineer ?
3) How plant operations engineer move towards new role/title like production planning engineer & project engineer ?
3) What skills are in demand for project/production planning engineer…Read more

]]> 0 d1c47a2945972745d5bfad1c725e7aa0 Hamzaali1999 started the topic Troubleshooting & Inspection & Understanding in the forum Process Operations https:/forums/topic/troubleshooting-inspection-understanding/ Sun, 08 Jan 2023 05:04:39 +0000 Dear Sir,

I want to understand troubleshooting of pumps (centrifugal pump) & compressors (reciprocating/centrifugal).

1) How to inspect these equipment as an operation engineer ? What things one need to check and monitor ?

2) A pump used to pump the fluid having RVP of 1.8 psi. Can we pump a fluid having RVP of 6-9 psi by using this same…Read more

]]> 0 95873f5f94af33c7d9626f3d3634e551 Nagendra H became a registered member https://thepetrosolutions.com/activity/p/3300/ Wed, 09 Nov 2022 10:09:35 +0000 0 31cc7b5dc882dfaaf413be095bde187f EIRINI MALESKA became a registered member https://thepetrosolutions.com/activity/p/3299/ Wed, 09 Nov 2022 10:09:16 +0000 0 1c93e9791e52509cccfc61deaeef4458 Tamer became a registered member https://thepetrosolutions.com/activity/p/3298/ Wed, 09 Nov 2022 10:08:36 +0000 0 40ac3fbeb536d6515200864804c22341 HASIB AKHTAR became a registered member https://thepetrosolutions.com/activity/p/3297/ Wed, 09 Nov 2022 10:07:54 +0000 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 3eff3360d3f1c75b176754ac25a34279 Fahad Iqbal became a registered member https://thepetrosolutions.com/activity/p/1855/ Mon, 25 Jul 2022 02:59:13 +0000 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 068dc83aecf4871f7f55f1aa6dae37c5 Usman Rasheed replied to the topic Oxy fuel combustion in process heaters of oil refinery in the forum Process Operations https:/forums/topic/oxy-fuel-combustion-in-process-heaters-of-oil-refinery/#post-674 Sat, 09 Apr 2022 10:40:36 +0000 Oxy-fuel combustion is the process of burning fuel using pure oxygen instead of air. Since the nitrogen component of air is not heated, fuel consumption is reduced, and higher flame temperatures are possible. Historically, the primary use of oxy-fuel combustion has been in welding and cutting of metals.
Advantages:
1. The mass and volume of the…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?

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