PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
OIL & GAS
CHEMICAL
PIPING CODES & SPECIFICATIONS
GENERAL PIPING SPECIFICATIONS
1
Scope
6
Vents & drains
1 1
Shipping lengths
2
Code requirements
7
Orifices
1 2
Piece marking & painting
3
Drawing & procedures
8
Clearance & spacing
1 3
Testing
4
Piping
9
Insulation & painting
1 4
Color code
5
Instruments
1 0
Fabrication tolerances
PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
1. SCOPE
PIPING CODES & SPECIFICATIONS
1. CODES
This specification covers :
The materials
Procedures
PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
2. CODE REQUIREMENTS
PIPING CODES & SPECIFICATIONS
2. CODE REQUIREMENTS
Piping should be in accordance with the applicable ASME codes :
American
Society of
Mechanical
Engineers
PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
3. DRAWINGS
AND PROCEDURES
PIPING CODES & SPECIFICATIONS
3. DRAWINGS AND PROCEDURES
Drawings should clearly indicate :
Clearances
Supports
Intersections
Expansion provisions
Anchors
Equipment nozzles
Guides
FEET
Used when dimensions are < 1” 
INCHES
PIPING CODES & SPECIFICATIONS
3. DRAWINGS AND PROCEDURES
Drawings should clearly indicate : Clearances Intersections Anchors Supports …
Pipe shall be dimensioned from coordinates to show location
Elevations shall be used to indicate height measurements
FEET
Used when dimensions are < 1” 
INCHES
PIPING CODES & SPECIFICATIONS
3. DRAWINGS AND PROCEDURES
SINGLE LINE
DOUBLE LINE
NPS ≤ 12”
NPS ≥ 14”
PIPING CODES & SPECIFICATIONS
3. DRAWINGS AND PROCEDURES
Each pipeline shall be clearly marked with a line number
Unit number
Line number
Piping Specification Class
Nominal Pipe Size
07-21-IF15-10”-IH
PIPING CODES & SPECIFICATIONS
07-21-IF15-10”-IH
Unit number
Insulation symbol
Line number
IC : Cold
IH : Hot
IS : Safety
PP : Personnel
Protection
Piping Specification Class
Nominal Pipe Size
Heat tracing symbol
ET : Electric Traced
ST : Steam Traced
SJ : Steam Jacketed
PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
4. PIPING
PIPING CODES & SPECIFICATIONS
4. PIPING
Piping materials shall be in accordance with specifications
All piping (if applicable) shall be routed : Overhead Shortest Minimum number of fittings…
All nongalvanized
steel underground lines shall be coated and wrapped
non
All operating valves 6’ above Grade or platform shall be chain operated
Expansion / contraction shall be considered for each line
PIPING CODES & SPECIFICATIONS
4. PIPING
NPS
1 ¼”
2 ½”
3 ½”
5”
7”
Shall not be used for
equipment connections
PIPING CODES & SPECIFICATIONS
4. PIPING
THERMOCOUPLE
ü
Inside surface free of any weld metal
ü
Opening clear
PROCESS PIPE
COUPLING
EXAMPLE OF
THERMOCOUPLES
WELL
PIPING CODES & SPECIFICATIONS
4. PIPING
Steam tracing shall be installed in accordance with job standards
Pipe supports spacing shall be 20’ maximum with pick-up supports as required
for lines 3” and smaller
PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
5. INSTRUMENTS
AND CONNECTIONS
PIPING CODES & SPECIFICATIONS
5. INSTRUMENTS AND CONNECTIONS
Liquid level controllers and gage glasses shall be located so as to be accessible
Pressure gage connections shall be ¾”
Test connections shall be ¾”
Temperature instrument shall have 1” NPT and shall be located :
45° off centerline
or in the horizontal
EXAMPLE OF
THERMOCOUPLES
PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
6. VENTS
AND DRAINS
PIPING CODES & SPECIFICATIONS
6. VENTS AND DRAINS
All lines shall have high point vents and low point drains
Vents and drains shall be ¾” couplings with pipe plugs
Vents and drains shall be flanged
for aluminum pipe
PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
7. ORIFICES
PIPING CODES & SPECIFICATIONS
7. ORIFICES
Air / Gas services
Steam / Liquid services
Orifice flanges
Flange taps
Orifice plate
VERTICAL
HORIZONTAL
PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
8. CLEARANCES
AND SPACING
PIPING CODES & SPECIFICATIONS
8. CLEARANCES AND SPACING
1
Roadways
3
Platforms
2
Walkways
PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
9. INSULATION
AND PAINTING
PIPING CODES & SPECIFICATIONS
9. INSULATION AND PAINTING
All hot insulated lines 2 ½” larger
shall be on 3” minimum height shoes
HOT INSULATION
PIPE TO BE
INSULATED
3” MIN
GUIDE
SHOE
PIPING CODES & SPECIFICATIONS
9. INSULATION AND PAINTING
All low-temperature
piping will rest
low
on the insulation with a steel cradle
outside of the insulation to distribute
the load at the point of the support
COLD INSULATION
PIPE TO BE
INSULATED
STEEL CRADLE
PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
10. FABRICATION
TOLERANCES
PIPING CODES & SPECIFICATIONS
10. FABRICATION TOLERANCES
Flange bolt holes shall straddle the vertical, horizontal, or North-South centerline
PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
11. SHIPPING
LENGTHS
PIPING CODES & SPECIFICATIONS
11. SHIPPING LENGTHS
Piping shall be prefabricated in as few pieces as possible,
possible consistent with rail or
truck shipment, to minimize field welding
Field welds shall be straight butt welds
Ensure flange faces are protected from corrosion or rust
PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
12. PIECE MARKING
AND PAINTING
PIPING CODES & SPECIFICATIONS
12. PIECE MARKING AND PAINTING
Each shop fabricated spool piece shall have a mark number assigned
Shop-fabricated piping shall be cleaned of all rust, mill scale, weld slag and splatter,
and primed before shipment
PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
13. TESTING
PIPING CODES & SPECIFICATIONS
13. TESTING
Lines hydrostatically tested in place
Pneumatically tested if water may have
deleterious effect on piping
Lines venting or draining to atmosphere
shall not be tested
HYDROSTATIC
PIPING CODES & SPECIFICATIONS
GENERAL
PIPING
SPECIFICATIONS
14. PIPE LABELING
AND COLOR CODE
PIPING CODES & SPECIFICATIONS
14. PIPE LABELING AND COLOR CODE
1
Bold text
 Identifies the pipe’s content by name
2
Color coding
 Communicates the catagory of the content
3
Flow direction arrows
 Shows direction of flow of the pipe’s content
4
Label sizing
 Ensures the label is visbile and legible
5
Label placement
 Ensures clear viewing from a normal approach
PIPING CODES & SPECIFICATIONS
14. PIPE LABELING AND COLOR CODE
2
Color coding
 Communicates the catagory of the content
PIPING CODES & SPECIFICATIONS
14. PIPE LABELING AND COLOR CODE
4
Label sizing
 Ensures the label is visbile and legible
PIPING CODES & SPECIFICATIONS
14. PIPE LABELING AND COLOR CODE
5
Label placement
 Ensures clear viewing from a normal approach
Near all valves and flanges
Adjacent to changes in direction
Both sides of floor / wall penetrations when applicable
OVERHEAD
At regular intervals on long straight runs of pipe (~1 label / 50 ft)