NST Design and Engineering

Design and Engineering

Our highly experienced team of consultants and specialists enable NST to supply Clients with the most advanced studies/analyses which are required by the Oil & Gas industry. At NST, we deliver a wide variety of engineering services for the whole lifecycle of offshore and onshore plants. Our expertise covers pre-service, in-service, post- service and decommissioning.

We provide conceptual studies before the commencement of and/or during detailed engineering stage. This aims to propose more time and cost efficient solutions and minimise potential risks. Our experts have experience of involvement in large to small-scale projects such as:

Structural Design and Analysis for Offshore Fields
Subsea Equipment and Pipeline Design and Analysis
Tank Farm Design and Execution
Marine Operation and Heavy Lifting
Engineering Software Development

Structural Design and Analysis

Conceptual Studies

NST provides conceptual studies before commencement of detailed engineering stage. This aims to propose more time and cost efficient solutions and minimise potential risks.

Detailed Engineering

Design and Analysis of tens offshore structures, in particular fixed platforms, have been carried out by our team of engineers. Our engineers have been involved in design and analysis of jacket, topside, bridge and jack-up structures in the North Sea, Middle-East, Africa and Caspian Sea. NST is capable to deliver a wide range of structural analyses for assessment of offshore structures to the latest standards.

Advanced FE Analysis

Using ANSYS, ABAQUS and USFOS to develop solutions for a wide range of applications including pushover analysis, fracture mechanics, blast walls, wellhead equipment, Stress Concentration Factor (SCF) determination, preloaded connectors and threaded connectors, non-linear materials and ultimate capacity analyses.

Subsea Equipment and Pipeline Engineering

Wellhead Equipment

Wellhead equipment and production systems shall be designed as per API 6A and API 17D requirements for surface and subsea use respectively.

API Specification 6A (ISO 10423) recommends product specification levels (PSLs) and Performance Requirement levels (PR) for equipment with quality control requirements for various service conditions based on the design pressure/temperature level and material class. PSLs apply to primary equipment:

Tubing heads
Tubing hangers, hanger couplings
Tubing head adapters
Lower master valves

NST offers preparation of required documentations for achieving API Certification and API Monogram as per requirements of standard. Moreover NST supplies services for executing and management of PR testing.

Consultation and preparing documentation to justify applicable PR and PSL level.
Preparing design validation and calculation package
Test equipment design and manufacturing as per API 6A/17D standards requirements
Preparing factory acceptance test (FAT) and System Integration test (SIT) procedures
Supervising FAT and SIT and preparation of result reports
Coordination with independent certifying bodies in order to get appropriate certification

Design Verification of Subsea Equipment

Our experts have been successfully involved in several would class subsea field development projects in the North Sea, Gulf of Mexico and Mediterranean Sea. Some of these projects have been the biggest subsea projects at their time. In NST we are proud of offering design checking and provision of engineering calculations for pressurized subsea equipment w.r.t to API and ISO standards. This includes:

Code checking w.r.t API standard for Valves, Connectors, etc
FE Analysis of complex geometries
Development of FAT procedures
CP design
Foundation design and/or PSI analysis
Structural analysis

Design of Conductor Connectors

Using ANSYS and ABAQUS, we offer design of complex Riserlock Connectors in accordance with ASME VIII Div.3and ISO13628-7 code.

Design of Floating Risers

Our team has been involved in design of several floating risers. Side picture shows results of a analysis for workover riser in tubing hanger mode. Time domain analysis using non-linear geometry and irregular seas was adopted for this analysis. Marine riser and workover riser modelled as separated strings with contact at clamps.

Storage Tank Design and Project Manangement

Cost Efficient & Environmental Friendly Storage

We provide state of the art design for storage tanks for Oil and Gas industry to all international standards such as API 650, EN14015, etc.

All types of tank service/fluids:

Oil products (diesel, Gasoline, Jet A-1, etc.)
Crude oil
Chemicals
Pressure vessels
LPG (Liquefied Petroleum Gas)
VRU Tanks
Separation tanks
Water

All types of tanks design and tank equipment:

Single wall in concrete dike area
Double steel wall/double bottom
Aluminium Dome and Internal floating roof (IFR)
Steel floating roofs for crude oil (single deck and double deck)
Floating suction
Drainage and separation systems
Active fire protection
Vacuum bottom protection systems
Roof PV valves and vacuum breakers

Modernisation and Upgrade

As part of our services we provide modernisation and upgrade studies for existing storage facilities to meet latest European and international standards in product quality, environmental protection and cost-efficient storage solutions.

In-House Software

ParisVB - for fracture mechanics based fatigue and crack tolerance calculations

Rain4 - for rainflow counting of fatigue cycles

Spectra2 - for spectral fatigue analysis

Biggs8 - for dynamic blast analysis on beam structures

Risk6 - for calculating failure probabilities and optimum inspection intervals

Vustick - a graphics viewer for multiple pipe-in-pipe and general beam models

WcrCom - This is the interpreter for writing Flexcom input files

GensodSprings - This is the interpreter for reading Gensod files and writing Flexcom input

Heavy Lifting and Marine Operations

Heavy Duty Equipment

Strand jacks can offer a flexible way to handle the largest of loadsfor loud-out, roll-up and lifting operations. NST has experience of design of advanced heavy duty hydraulic strand jacks with pulling capacity of 300Te per unit. A central control unit was designed to synchronise up to 20 number of hydraulic jacks accommodating ultimate pulling capacity of 6,000Te.

Offshore-Inshore Operation

NST engineering team is well experienced in heavy load handling engineering and prepared to offer the safest and economical solutions using existing facilities of the Client. Our experts have already been involved in several operations such as load-out, roll-up and lifting of multi thousand tones offshore structures deploying combination of strand jack, lifting towers, crawler cranes and flat barge. Video below, demonstrates our proposals for the aforementioned operations.

Picture from; http://trade.indiamart.com/