Product Design Specification

1
Product Design Specification

• Eng. Nabil Ahmed Mourad
• B.Sc. Cairo University Mechanical
  Engineering.M.Sc. Arts Et Metier, France,
  Thermodynamics.Abu Dhabi Company for Onshore Oil
  Operation.Engineering Services
  Department.March 2006

2
Product Specification

• Table of Content
• Types
• Structure
• Forms
• Typical Content of specification
• Preparation of specification
• Continual improvement

3
Types of Specifications

• International Standards
• Industrial Standards
• Company Specification
• Project / product specific

4
International Standards

• ISO Definition
• Document, established by consensus and approved
  by recognized body that provides for common and
  repeated use, rules, guidelines or characteristic
  for activities or their results, aimed at the
  achievement of the optimum degree of order in
  given context.

5
International Standards

• Examples
• British Standards. BS
• American Petroleum Institute. API
• American Society for Mechanical Eng. ASME
• Dutch Industrial Norm. DIN
• International Standard Organization ISO

6
Industry Standards

• Document developed by a recognized international
  industrial organization operating in specific
  industry to formalizes polices and provide rules
  and guidance for the initiation, generation and
  maintenance of design and Engineering practices,
  learned over a period of time and resulted from
  diversified application.

7
Industry Standards

• Examples
• Shell DEP
• British Petroleum BPS
• Mobil Standards MS
• Exxon Standards ES

8
Local / Company Standard

• Document developed by an operating company to
  provide technical guidance and recommendations
  based on the experience gained in the company,
  for specific operation, over a considerable
  period of time and in a specific geographical
  location.
• Examples
• Gulf standard for cars.
• Saudi Operation Specification. SOS
• Petroleum Development Oman. POD

9
Project / Product Specification

• Document developed to define the technical
  requirements that apply for specific project or
  product.
• Examples
• Abu Dhabi North East Oil development
• Rolls-Roys Cars.
• GE refrigerators.
• Masafi bottled water.

10
Engineering Standards - Structure
International Standards
Order of Precedence
Industry
ADCO Engineering Standards
Progressive development
Project Specification
11
Forms of Specification.

• Stand-alone specifications
• Fully elaborated document contains all technical
  requirement. They requires extensive efforts to
  prepare and maintain with lot of repetition.
• Amendment to applicable standards
• Brief document referring to the existing
  standards and specify changes as applicable
• Functional specifications.
• It is a statement of requirement.

12
Typical content of Specification.

• Technical requirement
• Process - Design - Material - Testing
• Code requirement
• Health Safety and Environment
• Customer needs
• Market requirement
• Manufacturer-ability/Construct-ability
• Operability / Maintainability
• QA / QC requirement

13
Development of Product specification

• Preparation.
• This is the most critical engineering activities
  where customer requirements are defined by
  experienced engineers.
• Review.
• This includes the multi discipline review for
  checking correctness, completion and maximizing
  value.
• Approval.
• Authorization of the document by the most senior
  technical authority in the organization.
• Revision control.
• A mechanism that control the changes to
  specification and sustaining the technical
  integrity of the specification.

14
Preparation of Specification

• Define the basic functions using Verbs and Nouns
  Ex. Pump - Water Cool - Air
• Transport - Goods Cut -
  Metal
• Define the basic duties using quantities and
  units.
• Ex. Flow 1000 M3 /
  hr.
• Inlet Temp. 40.0 Degree
  Centigrade.
• Inlet Pressure 2.0 bars
• Outlet Pressure 20 bars.

15
Tank / pump Assembly
120 m
95 m
80m
79 m
A
B
30 m
Tank Motor Pump
Pipeline (60 Km)
16
Pump and motor sizing
17
Preparation of Specification

• Check process conditions
• Ex. Water composition Alkalinity/Acidity
• Solid content Gas/water ratio.
• Operation conditions
• Ex. Fixed / Variable duties Variances.
• Site conditions
  Reliability.
• Determine design features
• Ex. Pump type Driver
  type.
• Protection systems
  installation.

18
Wind Load
Wind pressures on closed or fully clad structures
at high Z is Pz Pz 0.637 x (Uz)2 x Cf x K
(KN/m2) Uz F x V10 x (Z/10) 1/y F and y vary
with gust duration as follows Category Topography
F3 F10 y 1 Extreme
exposure 1.5 1.3 14 2 Open
country with 1.7 1.4 11
low obstruction. 3 Built up
areas with 2.0 1.6 8 high
obstruction V10 is the mean hourly speed (m/s)
at high of 10 m. Cf the shape coefficient K
Correction factor for aspect ratio (L/W of the
object)
19
Preparation of Specification

• Select Material
• Ex. Serviceability Availability
• Manufacturing Maintenance
• Durability Cost.
• Testing
• Criticality Mech. String test.
  Performance test Durability test.
• Code requirement
• Basically listing the applicable codes and
  standards

20
Preparation of Specification

• HSE requirement
• Ex. Noise level Safe distance
• Leaks / Vents Safeguarding
• Customer needs
• Ex. Service-life Availability
• Utilities Painting
• Dimensions Weight
• Market requirements.
• Consider your competitors, Customer expectation
  and market trends.

21
Noise Level
Noise level in building shall not exceed the
following Area MASP
db(A) Areas in workshops and machinery house
70 Workshop offices 60 Control
rooms 50 Offices and conference
rooms 45 Accommodation
40 HVAC equipment 10 Notes 1) If noise
has an impulsive and or tonal character, the
above limits should be lowered by 5 db(A) 2)
Noise generated by the user of the various area
need not to be considered.
22
Safe distance
23
Preparation of Specification

• Manufacturing
• The proposed design should be checked for ease of
  manufacturing i.e. the industry can realize the
  product at the most cost effective matter using
  proven technologies with minimum risk.
• Operability / Maintainability
• The design should provide operation friendly
  product that will deliver its objective over the
  intended service life without any major break
  down or excessive frequent maintenance efforts.

24
Preparation of Specification

• Quality Assurance
• Assess the supplier by requesting information
  on
• - Quality system - Technical know-how
• - Production capacity - Financial status
• Quality control
• Specify the Q/C requirement in the requisition
• - Periodic audits - Inspection
• - Witnessing tests - Review Q/C
  documents
• - Audit Q/C procedure - Certification

25
Continual Improvement

• New Technology
• Latest industrial developments that enhance
  value.
• Customer feedback
• User feed back is the most valuable information
  for improvement
• Competitive specification
• Benchmark with others to be the world class
• Market trends
• Reading the future market trends will make you
  the front runner.

26
Remember

• Standards exist
• to be used
• to be critically examined
• to be modified if not suitable
• We are most at risk with complex systems whether
  during manufacturing, use or modify. Standards
  are our save guarding system.