oilfield pulse

HOW TO CHANGE PLATES IN DANIEL SENIOR OR***CE METERS.

Changing an or***ce plate in a Daniel Senior Or***ce Meter is a specialized task because it allows you to remove the plate without shutting down the pipeline flow.

It so happens that this particular task is one of the most feared tasks in surface well testing as gory tales of operators split in twos by flying or***ce plates ejected forcefully during or***ce plate swapping or inspection.

Below is a breakdown of the operation using the dual-chamber design.

The Dual-Chamber Mechanism
The fitting is divided into a lower 👇🏾chamber (where the gas flows) and an ☝🏾upper chamber (the maintenance area).
They are separated by a slide valve.

✅ Phase 1: Moving the Plate Up

* Step 1: Equalize Pressure. Open the Equalizer Valve. This allows high-pressure gas from the pipeline into the upper chamber so the pressures match.

* Step 2: Open Slide Valve. Once pressure is equal, turn the Slide Valve Shaft to open the internal gate.

* Step 3: Crank the Plate. Use the operating wrench on the Lower Gear Shaft, then the Upper Gear Shaft, to "scroll" the plate carrier from the bottom chamber to the top.

✅ Phase 2: Isolation and Extraction

* Step 4: Close Slide Valve. Once the plate is safely in the upper chamber, close the Slide Valve to seal off the pipeline pressure.

* Step 5: Bleed Pressure. Close the equalizer valve and slowly open the Bleeder (Vent) Valve to release the gas trapped in the upper chamber. Wait until the gauge reads zero.

* Step 6: Open the Top. Loosen the Clamping Bar Screws, remove the bar and the Sealing Bar, and crank the plate out for replacement.

Do the reverse ◀️ to return inspected or changed plate with an exception. At the last step the slider is closed, equalizer valve is closed and then bleeder valve is opened to depressurize upper chamber.👍🏾

⚠️ NOTE:

🚧 Equalizer Valve is opened first to balance pressure before moving parts.

🚧 Bleeder Valve opened last to safely vent the top chamber for opening.

🚧 Grease Gun injects sealant to ensure the slide valve seals perfectly.

***cemeter

Here are two key uses of "surge tanks" (also called vertical surge tanks or VSTs) in surface well testing operations in the oil and gas industry. These are the most commonly highlighted functions in standard well test packages:

1. Temporary storage of liquid hydrocarbons after separation
Surge tanks act as a pressurized storage vessel (typically H₂S-rated) to hold the separated liquid (oil/condensate) coming from the test separator. This provides buffer capacity during flowback or testing, especially when disposal or transfer rates are limited, allowing continuous well flow without immediate flaring or trucking of liquids.

2. Accurate measurement of liquid flow rates (and calibration/shrinkage correction)
By monitoring the volume accumulation over time (using sight glasses, level indicators, or compartments), surge tanks enable precise measurement of low or variable liquid rates. They are also used to determine the combined shrinkage and meter factor, helping calibrate the primary separator's liquid meters for more reliable production data.

These two functions make surge tanks essential for safe, accurate, and efficient well testing — especially in H₂S environments where open gauge tanks can't be used.

Essential for accurate data & safe operations!

Fire classification

Lifting hooks checking

PNEUMATIC LEVEL CONTROLLER IN OIL & GAS PRODUCTION

During oil and gas production operations, maintaining the correct liquid level inside process vessels is critical for efficient separation and safe facility operation. One of the most reliable instruments used for this purpose is the Pneumatic Displacer Level Controller.

Main Purpose of the Controller

The primary purpose of this controller is to maintain a stable liquid level inside a process vessel by automatically adjusting the outlet control valve.
In oil and gas production separators, crude oil, water, and gas enter the vessel together. The gas rises to the top while liquids settle at the bottom. If the liquid level becomes too high or too low, it can cause several operational problems:

High Liquid Level
-Liquid carryover into the gas line
-Reduced separation efficiency
-Potential damage to downstream equipment

Low Liquid Level
-Gas blow-by into liquid outlets
-Poor liquid retention time
-Process instability

The controller prevents these problems by automatically regulating the discharge valve to maintain the desired level.

MODE OF OPERATION

The operation of this controller is based on a displacer(float) and torque tube mechanism combined with pneumatic control.

1. Level Detection (Displacer Principle)

Inside the vessel, a displacer is suspended in the liquid.
When the liquid level changes, the buoyant force acting on the displacer changes.
-If the level rises → buoyancy increases
-If the level falls → buoyancy decreases
This change in force causes a mechanical rotation in the torque tube connected to the controller.

2. Mechanical Motion Transfer

The movement of the torque tube is transferred through linkages and levers inside the controller, which move the control mechanism.
This mechanical movement acts on a pilot valve or flapper-nozzle system, which regulates pneumatic pressure.

3. Pneumatic Signal Generation

The controller uses instrument air to generate a control signal.
As the level changes:
-The flapper moves closer or further from the nozzle
-This changes the air pressure output signal

4. Control Valve Action
The pneumatic signal adjusts the liquid dump valve.
Example operation:
• Level rises above setpoint
→ Controller increases output pressure
→ Valve opens more
→ More liquid leaves the vessel
→ Level returns to normal
• Level falls below setpoint
→ Controller reduces output pressure
→ Valve closes slightly
→ Liquid retention increases
→ Level rises back to setpoint
This process continues automatically and continuously

Why Pneumatic Controllers Are Still Used in Oilfields

Even with modern digital instrumentation, pneumatic level controllers are still widely used because they are:
✔ Extremely reliable
✔ Explosion-proof (no electricity required)
✔ Simple to maintain
✔ Suitable for remote desert locations
✔ Resistant to harsh environments

This is why they are commonly installed in well test separators and production facilities.

If H₂S Detected During Gas Testing, What Should Tester Do?

❓ Situation

Gas tester finds H₂S in confined space

🚨 Important

H₂S is:
❌ Highly toxic
❌ Smells like rotten egg
❌ Can kill in minutes

✅ Safe Limits

✔ 0–10 ppm = safe
⚠ 10–20 ppm = caution
❌ Above 20 ppm = NO ENTRY

✅ Tester Actions

👉 Do NOT allow entry
👉 Stop permit
👉 Inform safety officer
👉 Ventilate space
👉 Use blower/fan
👉 Retest atmosphere
👉 Entry only after safe reading

✅ Example

Reading = 35 ppm
Tester blocks entry
Starts ventilation
Retest - 5 ppm
Then allow work

🎯 Interview Line

“If H₂S exceeds limit, entry must be stopped until ventilation makes atmosphere safe.”

Meaning of Markings on the Bow Shackle

1. WLL 25T (Working Load Limit)

Indicates the maximum safe working load of the shackle is 25 tons.
This limit must never be exceeded. Overloading can cause deformation or failure.

2. CE (European Conformity)

Confirms the shackle complies with European Union safety and conformity requirements, including manufacturing and material standards.

3. 45

Acts as an angle reference mark for rigging.
Helps identify acceptable load angles and warns against improper side loading, which significantly reduces the shackle’s capacity.

4. 6 (QUIC-CHECK® / QC Mark)

An inspection aid mark cast into the shackle body.
Used for quick visual checks to detect wear, deformation, or elongation during routine inspections.

5. 1 3/4 (1.75 inch)

The nominal shackle size.
This size determines:
• Physical dimensions
• Pin diameter
• Compatible sling, wire rope, or chain sizes
• Associated Working Load Limit
A 1¾″ shackle is typically used for heavy lifting applications.

6. UK

Indicates United Kingdom standard compliance or serves as a manufacturer or factory identification code, depending on the brand.

7. Additional Symbols / Logos

Manufacturer’s trademark or extra certification marks.
Used for traceability and verification of genuine, certified lifting equipment.

Well testers what is this??

Four Types of Gas Detectors Used in Oil & Gas

📌 Explanation

In oil & gas sites, a 4-gas detector is commonly used to protect workers from invisible dangers.

The four gases are:

1️⃣ Oxygen (O₂) – Checks if oxygen is low or high
2️⃣ LEL – Detects flammable gases to prevent explosion
3️⃣ Carbon Monoxide (CO) – Poison gas from engines
4️⃣ Hydrogen Sulfide (H₂S) – Highly toxic, deadly gas

🧠 Example

Before entering a confined space, workers test air using a 4-gas detector. If values are unsafe, entry is NOT allowed.