HMEL Tank Construction Quiz

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Questions and Answers

During tank construction, what is the purpose of wind girder (Secondary) works?

To lift the tank shell courses

To install nozzles and manholes

To ensure wind stability of the structure (correct)

To test the tank for leaks

What does the formation of continuous bubbles during tank construction indicate?

Completion of shell erection

A successful weld joint

Proper hydraulic jack operation

Leakage (correct)

In tank construction, what is the purpose of conducting an Oil Chalk Test / Chalk Diesel Test?

To measure settlement readings

To inspect for mechanical clearances

To check for water tightness (correct)

To test the hydraulic jacks

What procedure should be followed after obtaining all NDT & Mechanical Clearances during tank construction?

Proceed to Hydrostatic Test / Water Filling Test Signup and view all the answers

What is the primary purpose of Nozzles / Manholes / COD in tank construction?

Access points for maintenance and inspection Signup and view all the answers

Why should settlement readings be taken at every stage of water filling and dewatering during tank construction?

To monitor any structural shifts or uneven settling Signup and view all the answers

What is the purpose of the shell course lifting process in tank construction?

To hoist and place the horizontal courses of a storage tank Signup and view all the answers

During a hydrostatic test, what is being tested?

The integrity of the tank's weld joints Signup and view all the answers

What are nozzles and manholes commonly used for in tank construction?

To provide access for maintenance and inspection Signup and view all the answers

In the context of wind girder works, what is the primary function of a wind girder?

To prevent wind-induced uplift forces on the tank shell Signup and view all the answers

Which activity in the C.T. Project has the highest weightage percentage?

Detailed Engineering Signup and view all the answers

In tank construction, what is typically installed last before completing a tank?

External Floating Roof Signup and view all the answers

What type of tank is recommended for pressures between 0.05 - 0.85 Kg/cm2 (g)?

Spheres Signup and view all the answers

For which tanks would you likely use API 650 standards?

Internal Floating Roof Signup and view all the answers

What is the purpose of a vacuum box test during tank construction?

To check the integrity of welding of the lap joints of bottom plates Signup and view all the answers

When constructing Single Deck Floating Roof Tanks with a diameter of over 50 meters, what type of deck would be used?

Double Deck Signup and view all the answers

What is the purpose of R.F. Brick lining during tank construction?

To provide insulation to the tank Signup and view all the answers

Which type of tanks are recommended for pressures below 0.05 Kg/cm2 (g)?

Cone Roof Signup and view all the answers

What is the main function of a wind girder in tank construction?

To provide additional structural support against wind loads Signup and view all the answers

Which API standard would be most relevant for Double Wall Storage Tanks?

API 620 Signup and view all the answers

When constructing tanks, what is the purpose of PVC lining?

To act as a protective layer against corrosion Signup and view all the answers

How is a hydrostatic testing of a tank typically done?

By filling the tank with water and pressurizing it to check for leaks Signup and view all the answers

Study Notes

Wind Girder Works

Wind girder, a structural component, provides lateral stability to tanks against wind loads.
Critical during tank construction to prevent buckling and ensure overall structural integrity.

Continuous Bubbles Formation

Formation of continuous bubbles during construction indicates potential leaks or insufficient bonding in welded joints.

Oil Chalk Test / Chalk Diesel Test

Conducted to determine the compatibility of tank materials with various oils or diesel, ensuring suitability for intended contents.

NDT & Mechanical Clearances Procedure

After securing Non-Destructive Testing (NDT) and mechanical clearances, the next step involves preparing for hydrostatic testing to validate construction integrity.

Nozzles / Manholes / COD Purpose

Nozzles are used for fluid input/output, manholes allow access for inspection and maintenance, while COD (Control Openings) facilitates pressure equalization and safety measures.

Settlement Readings

Necessary at each water filling and dewatering stage to monitor and manage ground settlement, preventing structural damage or failure.

Shell Course Lifting Process

Involves lifting the tank shell during assembly to ensure precision in alignment and maintain vertical integrity throughout construction.

Hydrostatic Test

Tests the tank's strength and leak-proof integrity by filling it with water, simulating operational loads and identifying any weaknesses.

Nozzles and Manholes Function

Commonly utilized for connections to piping systems and maintenance access; critical for tank operational functionality and safety.

Wind Girder Function

Primarily serves to resist lateral forces from wind, maintaining the tank’s stability and preventing collapse.

Highest Weightage Activity

Tank construction activities associated with structural integrity, often having the highest weightage in project evaluation.

Final Installation Before Completion

Usually, the roof structure is installed last before the tank is finalized to ensure complete access during construction and avoid damage.

Recommended Tank Type for Certain Pressures

Tanks designed for pressures between 0.05 - 0.85 Kg/cm² are typically constructed with specific structural standards to manage these loads.

API 650 Standards Application

API 650 standards are applicable for Above Ground Storage Tanks (ASTs), particularly those storing crude oil and petroleum products.

Vacuum Box Test Purpose

A method used to detect leaks in welded joints and seams, ensuring the integrity of constructed tanks before commissioning.

Single Deck Floating Roof Tanks

For tanks over 50 meters in diameter, a pontoon type deck or similar is utilized to optimize performance and stability.

R.F. Brick Lining Purpose

Provides thermal insulation and protects the tank's shell from corrosive effects, enhancing lifespan and efficiency.

Recommended Tanks for Low Pressures

Tanks designed to operate under pressures below 0.05 Kg/cm² are typically constructed to lower safety and structural standards.

API Standard for Double Wall Storage Tanks

API Standard 653 is most relevant for Double Wall Storage Tanks, focusing on the integrity and safety of such constructions.

PVC Lining Purpose

Used to protect the internal surfaces from corrosion, chemical degradation, and to enhance the life expectancy of the tank.

Hydrostatic Testing Procedure

Typically involves filling the tank with water, maintaining pressure for a specified period, and checking for leaks or deformities to ensure operational readiness.

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Test your knowledge on tank construction, blasting, painting, and other related topics at HPCL Rajasthan Refinery Limited. Explore questions related to dyke, pavement, crude tanks, and upstream facilities like CDU/VDU.