We have some amazing career opportunities available! If you have the skills and qualifications for any of these positions, don't hesitate to apply. We're looking for candidates for the following positions

We have some amazing career opportunities available! If you have the skills and qualifications for any of these positions, don't hesitate to apply. We're looking for candidates for the following positions:

Commercial

Contracts Engineer

Project Control Manager (Commercial and Costing)

Subcontracts Officer

Eng Design

Lead/ Senior Process Engineer

Senior Process Engineer

SmartPlant Administrator

Finance

Finance Executive (GL)

Security

Security Officer

Supply Chain

Expediting Lead (Package)

Logistics Assistant / Coordinator

Logistics Executive

Logistics Officer

Marketing Executive/ Assistant (Procurement)

Procurement (Senior Executive / Executive) / 5 days

Procurement Expeditor

Procurement Manager (Contract Management)

Procurement Manager (Marine & Offshore Project Lead)

Procurement Officer/ Senior Procurement Officer (Freight & Custom Regulations)

Purchasing Executive

Operations

Admin Executive

Crane Operator

Dimension Controller

Document Controller

Environment Engineer / Lead

EPC Project Control Engineer

HSE Coordinator

HSE Officer

Lead / Senior Commissioning Electrical Engineer

Lead Commissioning Mechanical Engineer

Lead/ Senior Planner

Quality Assurance Coating Engineer

Quality Assurance Electrical Engineer

Quality Assurance Mechanical Engineer

Quality Assurance Piping Engineer

Quality Assurance Structural Engineer

SafetyDriver (Class 4 -Emergency Vehicles)

Sub-contracting Engineer

 

Apply/Details 👉   https://oilandgasteam.com/offshore-onshore-jobs-in-singapore/

Chevron Oil & Gas Refineries Petroleum Field Operations Engineers JobsPlant -petroleu

Chevron Oil & Gas Refineries Petroleum Field Operations Engineers Jobs

Plant Operator

Biodiesel Operator, Loader

Quantitative Analyst

Senior Software Engineer

Senior Application Engineer

Able Bodied Seaman

Biodiesel Operator, Loader

Electronic & Instrumentation Specialist B

Biodiesel Operator, Loader

Experienced Tanks Designs Engineer

Biodiesel Operator, Loader

Class A Driver

Production Engineer Well Testing

Electronic & Instrumentation Specialist A

Operations & Maintenance

Experienced Mechanical Designs Engineer

Field Specialist Intern

Maintenance Engineer

Field Specialist - Internships & Trainees

Commercial Analyst

Commercial Advisor

Crude Supply & Trading - Trading Analyst

Trading COE Analyst - Finance & Contracts

Lead Instrumentation, Electrical & Power Technician

Commercial Manager, Power Development

Chiller Technician

Corporate Affairs Human Resources (HR)

Corporate Affairs Communications Advisor,

Field Specialist A

Apply/Details 👉 https://rigzonejobs.com/chevron-oil-gas-refineries-petroleum-field-operations-engineers-jobs-united-states-usa-canada-ca/

looking for the following candidates to be station in CHINA and willing to consider a Short Contract Assignment

Peak Ocean is looking for the following candidates to be station in CHINA and willing to consider a Short Contract Assignment.

Prepares candidates with experience in FPSO or FLNG Projects. (Open for all Nationality)

1. Control Narrative Documentation Engineer (Process/I&C)

2. Senior Engineer - ICSS

3. Senior Engineer, Instrumentation & Control

4. Senior Engineer, Electrical and Instrumentation

5. Safety Engineer (Technical Safety/Loss Prevention Design and Engineering in major accidental event design, prevention, detection, control and mitigation, and Technical Safety related major risk assessment exposure)

Interested candidates may email their resume to joan@peakoceangp.com

Mohamed abd elgawwad 

Flow Measurement

Thermal mass flowmeter

Flow MeasurementInstrumentation

Thermal mass flowmeter

What are Mass flowmeters?

A Mass flowmeter measures the amount of fluid pass through the pipe. Mass flow measurement gives a more accurate account of fluids and is not affected by density, pressure and temperature (unlike volumetric measurements).
Although most meters can infer mass flow rate from volumetric flow measurements, there are a number of ways to measure mass flow directly.

 

Thermal Mass Flowmeters:

Thermal mass flowmeter work on the principle of loss of temperature when a fluid stream passes across it.

The two main types of thermal mass flow measuring devices are:

• Thermal Anemometer
• Temperature rise flowmeter

Thermal anemometer:

The thermal anemometer works by measuring the heat dissipation from a probe inserted in the line. The amount of heat taken from the probe is dependent on the fluid velocity and density but is also a direct measure of the mass flow rate. The temperature is also measured by the calculation. They are also referred to as ‘Hot wire probes’.

The probe can either be constant current or constant temperature.

In the constant current type, a fixed current is passed through the probe which causes heating in the probe. As the flow rate varies, so does the amount of heat taken from the probe and hence the temperature changes. The temperature is measured to derive the flow.

For the constant temperature type, a feedback loop is required to maintain a constant temperature. As the change of flow affects the temperature, the current needs to be regulated to maintain probe temperature. The flow rate is determined by the power required to heat the probe. The constant temperature devices have a faster response to flow changes.

The temperature probe must protrude into the flow stream, and therefore may be easily damaged by corrosion and erosion. In addition, the robustness of the system is compromised by the protrusions into the fluid stream, increasing the chances of leakage.

However thermal anemometer has fast response times, < 0.5milliseconds.

 

Temperature rise flowmeter:

Temperature rise flowmeters work on the principle of heating the flow stream. By heating the flow stream at one point, the temperature can be measured both upstream and downstream of the heating point. Calculating the difference between the temperatures gives information about the flow rate.

This method requires the measurement of actually heating the process fluid. It is therefore limited to gas applications at low flow rates.

As with the hot wire probe, the temperature sensors and the heater must protrude into the flow stream, and therefore may be easily damaged by corrosion and erosion. Also, the robustness of the system is compromised by the protrusions into the fluid stream, increasing the chances of leakage.

There are external fixing types of temperature rise flowmeter for large pipelines:

External fixing provides Non-contact, non-intrusive sensing No obstruction to flow and Reduced maintenance.

Advantages:

• Thermal flowmeters are used to measure gas with low pressure
• Used measure low flow
• These flowmeters are frequently employed for monitoring and controlling of mass-related processes like chemical reactions.
• They offer good rangeability

Disadvantages:

• Practically for gas only.
• Power requirement execessive in large pipelines.
• Accurate field calibration is difficult.

Serial Communication

 Serial Communication

.
📌بالنسبة لل RS485 و RS232 دول بيستخدموا voltage signal علشان نقل البيانات
📌ال RS232 مقدرش احط اكتر من جهاز علي نفس network واقصي مسافة حوالي 50 متر
📌سرعة نقل البيانات 20kbs وكمان بيقابلني مشاكل noise


📌ال RS485 بيوصل لمسافات اطول حوالي 1200 متر بسرعه بيانات 90kbs واقصي سرعه عند 6 متر بتوصل 100Mbs
📌بستخدم 2wires في حالة اني شغال half duplex او 4wires لو اشتغلت full duplex وهنا جهاز مmaster والباقي slaves
📌بيحصل avoid لل noise بسبب استخدام differential signal كمان ممكن استخدم shielding للكابل علشان امنع الnoise


📌اما 20mA current loop بيستخدم current signal وطبعا الcurrent بيبقي افضل من ال volt في المسافات الطويلة
📌بيوصل ل 600 متر بسرعة بيانات 19.2kbs ودي سرعه بطيئة
📌مفيش standard علشان كدا لازم تدخل في التفاصيل الفنية للدايره بتاعتك وتفهمها وتختبرها
📌بيستخدم 2wires للارسال وغيرهم للاستقبال

1. What is CV?

 Cv is the Valve Coefficient, and is a measure of the capacity of a valve, which takes account of its size and the natural restriction to flow through the valve. Using published formulae it is possible to calculate the Cv required for an application. By comparing this calculated value with the Cv capacities of different valves it is possible to select a suitable size and type of valve for the application. Common Definition of CV

 

The Cv of a valve is the quantity of water in US gallons at 60 °F that will pass through the valve each minute with a 1 psi pressure drop across it. 

The Kv value is the metric equivalent in m3/hr with 1 bar pressure drop

Cv = 1.15 x Kv. The capacity of each valve can be expressed in terms of Cv - the value being determined experimentally in most cases. Using formulae developed empirically it is possible to calculate a Cv requirement for an application. By comparing the two figures it is possible to select the correct size of valve for the application. It is important to remember that the formulae and the valve Cv values are not exact, but are to be used as a guide. The most commonly used formulae are those supported by the Instrument Society of America (ISA). Simplified Liquid Service. C q G P v f e = ⋅ 1 1. 6 ⋅ ∆ Effective pressure drop is the smaller of (P1-P2) or ∆Pchoked P1-P2 is the actual Pressure drop ∆Pchoked = Fl²(P2-Pv) Where : Pv = Vapour pressure Fl = Pressure recovery factor Where : Cv is Valve Coefficient : Flow rate in m³/hr : Gf is Specific Gravity at the flowing temperature : ∆Pe is the effective pressure drop in Bar 1

Flow Measurement

Annubar flowmeter operation

Annubars are sometimes called average pilots and contain multiple pressure taps to “average” the flow; this is to try to compensate for a non-ideal flow profile.

The averaged pitot tube is inserted through the pipe as shown below. One side of the bar has pressure taps facing the flowing fluid and engaging in an “average” chamber that measures the total (ie, static + dynamic) pressure of the fluid.

There may be a single port or multiple outlet ports on the opposite side of the bar to measure the low static pressure in the downstream region.

The difference between the total pressure and the static pressure is effectively a measure of the height of the fluid velocity, which together with the area of the pipeline allows determining the volumetric flow.

 

 

Principle of Annubar operation:

The Annubar primary flow element is a device that is used to measure the flow of a liquid, gas or vapor that flows through a pipeline. It allows flow measurement by creating a differential pressure (DP) that is proportional to the square of the fluid velocity in the pipeline, according to Bernoulli’s theorem. This DP is measured and converted to a flow rate using a secondary device, such as a DP pressure transmitter.

The flow is related to DP through the following relationship.

where:

Q = Flow Rate

K = Annubar Flow Coefficient

DP = Differential Pressure

The Annubar generates a DP by creating a blockage in the pipeline and acting as an obstruction to the fluid. The fluid velocity decreases and stops as it reaches the front surface of the Annubar sensor, creating the impact / high pressure.

The Annubar detects the impact pressure using a DP transmitter.

As the fluid continues around the Annubar sensor, it creates a lower velocity profile on the back of the sensor, creating the low / suction pressure downstream of the Annubar. The individual ports, located on the back of the Annubar sensor, measure this low pressure. Working on the same principle as high pressure, an average low pressure is maintained at the low pressure that is connected directly to the transmitter for measurement.

The resulting differential pressure is the difference between the impact pressure reading (high) and the suction pressure reading (low) as seen below.

DP = PH – PL

where:

PH = High Pressure

PL = Low Pressure

The measured DP is used to calculate the flow rate.

Advantages:

• It can be inserted through a small opening.
• It can be used to sample the velocity at several points.
• Minimum obstruction that means less pressure drop