The below standard gives for study purposes the recommended maximum pipe spans in meters.
RECOMMENDED MAX. HORIZONTAL PIPE SPANS
- FOR CARBON.ALLOY AND STAINLESS STEEL
- MAX. WALL TEMPERATURE 400° C
- EXCLUDING LOAD CONCENTRATIONS
- CORROSION ALLOWANCE 1.3 MM (STAINLESS STEEL 0 MM)
| PIPE + WATER | PIPE + WATER + INSULATION | PIPE + WATER + INSULATION (STAINLESS STEEL) | ||||||||||
| PIPE DATA | L | S | L | S | S | S | ||||||
| SIZE | SCHEDULE | CONT. | END | CONT. | END | END | END | |||||
| SCHEDULE | SCHEDULE | |||||||||||
| A | B | A | B | A | B | A | B | A | B | 5S | 10S | |
| 1” | 80 | 4.8 | 3.2 | 4.2 | 2.9 | 2.8 | 2.9 | |||||
| 11/2” | 80 | 6.0 | 3.9 | 5.3 | 3.7 | 3.5 | 3.6 | |||||
| 2” | 40 | 6.0 | 4.4 | 5.3 | 4.2 | 4.0 | 4.1 | |||||
| 3” | 40 | 7.6 | 5.4 | 7.2 | 5.2 | 5.0 | 5.1 | |||||
| 4” | 40 | 8.5 | 6.2 | 7.9 | 5.8 | 5.4 | 5.6 | |||||
| 6” | 40 | 10.2 | 7.5 | 9.6 | 7.2 | 6.6 | 7.1 | |||||
| 8” | 20 | 30 | 10.5 | 10.9 | 8.5 | 8.6 | 10.0 | 10.4 | 8.1 | 8.2 | 7.0 | 7.8 |
| 10” | 20 | 30 | 11.0 | 11.9 | 9.0 | 9.6 | 10.4 | 11.3 | 8.5 | 9.1 | 7.7 | 8.4 |
| 12” | 20 | 30 | 11.4 | 12.8 | 9.3 | 10.4 | 10.8 | 12.2 | 8.8 | 10.0 | 8.7 | 8.9 |
| 14” | 10 | 20 | 11.6 | 12.7 | 9.5 | 10.4 | 11.1 | 12.2 | 9.0 | 10.0 | Multiply above spans by 1.2 to obtain all continuous spans | |
| 16” | 10 | 20 | 11.8 | 13.1 | 9.7 | 10.7 | 11.2 | 12.4 | 9.2 | 10.2 | ||
| 18” | 10 | 20 | 12.1 | 13.4 | 9.9 | 10.9 | 11.5 | 12.8 | 9.4 | 10.4 | ||
| 20” | 10 | 20 | 12.2 | 14.7 | 10.0 | 12.0 | 11.6 | 14.0 | 9.5 | 11.4 | ||
| 24” | 10 | 20 | 12.5 | 15.2 | 10.2 | 12.4 | 12.0 | 14.6 | 9.8 | 11.9 | ||
| End |
Continuous span
|
 |
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NOTES
1. PIPE SPANS ARE BASED ON BS3974 PART 1.APP.81
2. LENGTHS IN M
3. MAX. OCCURING LONGITUDINAL BENDING STRESS IN FULLY CORRODED CONDITION WILL NOT EXCEED 40 N/MM2
4. UNDERLINED SPANS ARE LIMITED BY MAX. DEFLECTION OF 6 MM WHEN EMPTY REMAINING LINES ARE LIMITED BY MAX. STRESS
5. FOR LOAD CONCENTRATIONS SUCH AS VALVES AND BRANCHES OR CHANGE IN WALL THICKNESS OR DIAMETER THE TABLED SPANS SHALL NOT BE USED BUT CALCULATED IN ACCORDANCE WITH BS3974 PART 1.APP.81
RECOMMENDED MAX. HORIZONTAL PIPE SPANS
- FOR CARBON.ALLOY AND STAINLESS STEEL
- MAX. WALL TEMPERATURE 400° C
- EXCLUDING LOAD CONCENTRATIONS
- CORROSION ALLOWANCE 3.0 MM (STAINLESS STEEL 0 MM)
| PIPE + WATER | PIPE + WATER + INSULATION | |||||||||
| PIPE DATA | L | S | L | S | ||||||
| SIZE | SCHEDULE | CONT. | END | CONT. | END | |||||
| A | B | A | B | A | B | A | B | A | B | |
| 1” | 80 | 3.4 | 2.3 | 2.5 | 2.1 | |||||
| 11/2” | 80 | 4.6 | 3.0 | 3.6 | 2.9 | |||||
| 2” | 80 | 5.6 | 3.8 | 4.9 | 3.6 | |||||
| 3” | 40 | 5.5 | 4.3 | 5.2 | 4.2 | |||||
| 4” | 40 | 6.4 | 5.1 | 6.0 | 4.8 | |||||
| 6” | 40 | 8.3 | 6.5 | 7.8 | 6.3 | |||||
| 8” | 20 | 30 | 8.1 | 8.8 | 6.6 | 7.5 | 7.7 | 8.4 | 6.3 | 7.1 |
| 10” | 20 | 30 | 8.5 | 9.9 | 7.0 | 8.5 | 8.1 | 9.4 | 6.6 | 8.0 |
| 12” | 20 | 30 | 8.8 | 10.8 | 7.2 | 8.8 | 8.4 | 10.3 | 6.8 | 8.5 |
| 14” | 20 | 30 | 11.1 | 11.7 | 9.1 | 10.1 | 10.7 | 11.9 | 8.6 | 9.7 |
| 16” | 20 | 30 | 11.3 | 12.8 | 9.3 | 10.4 | 10.8 | 12.1 | 9.0 | 9.9 |
| 18” | 20 | STD | 11.6 | 11.6 | 9.5 | 9.5 | 11.1 | 11.1 | 9.0 | 9.0 |
| 20” | 20 | STD | 13.7 | 13.7 | 11.2 | 11.2 | 13.0 | 13.0 | 10.6 | 10.6 |
| 24” | 20 | STD | 14.0 | 14.0 | 11.4 | 11.4 | 13.4 | 13.4 | 11.0 | 11.0 |
| End |
Continuous span
|
|
|
NOTES
1. PIPE SPANS ARE BASED ON BS3974 PART 1.APP.81
2. LENGTHS IN M
3. MAX. OCCURING LONGITUDINAL BENDING STRESS IN FULLY CORRODED CONDITION WILL NOT EXCEED 40 N/MM2
4. UNDERLINED SPANS ARE LIMITED BY MAX. DEFLECTION OF 6 MM WHEN EMPTY REMAINING LINES ARE LIMITED BY MAX. STRESS
5. FOR LOAD CONCENTRATIONS SUCH AS VALVES AND BRANCHES OR CHANGE IN WALL THICKNESS OR DIAMETER THE TABLED SPANS SHALL NOT BE USED BUT CALCULATED IN ACCORDANCE WITH BS3974 PART 1.APP.81