Skip to main content

Piping Dimensions (DN Vs NPS)

The size of pipes, fittings, flanges and valves are given in two Units

NPS = Nominal Pipe Size (Inches)

DN = Diameter Nominal (Metric)


Following is the comparison :

Diameter Nominal
DN
(mm)
Nominal Pipe Size
NPS
(inches)
6
1/8
8
1/4
10
3/8
15
1/2
20
3/4
25
1
32
1 1/4
40
1 1/2
50
2
65
2 1/2
80
3
100
4
150
6
200
8
250
10
300
12
350
14
400
16
450
18
500
20
550
22
600
24
650
26
700
28
750
30
800
32
900
36
1000
40
1050
42
1100
44
1200
48
1300
52
1400
56
1500
60
1600
64
1700
68
1800
72
1900
76
2000
80
2200
88
2400
96
2600
104
2800
112
3000
120
3200
128
  
Labels:

Comments

Post a Comment

Popular posts from this blog

The Stepping Stone Method

The Stepping Stone Method Once an initial feasible solution to a transportation problem is determined by any of the previous methods, the next step is to solve the model for the optimal solution. The Stepping Stone Method is an iterative technique used to evaluate the cost effectiveness of  the shipping routes not currently in the solution. When applying it, we test each unused cell, or square, in the transportation table by asking : What would happen to the total shipping cost if one unit of product was tentatively shipped to an unused route? To illustrate the same, let us look at the initial solution of the Bengal Plumbing Problem derived by the Northwest Corner Rule. Transportation Matrix for Bengal Plumbing From \ To Warehouse E Warehouse F Warehouse G Factory Capacity Plant A 100 Rs. 5 0 Rs. 4 0 Rs. 3 0 100 Plant B 200 Rs. 8 0 100 Rs. 4 0 Rs. 3 0 300 Plant C Rs. 9 0 100 Rs. 7 0 200 Rs. 5 0 300 Ware...
Post a Comment
Read more

The Intuitive Lowest Cost Method

The Intuitive Lowest Cost Method Or The Minimum Cell Cost Method The Intuitive Lowest Cost Method is a cost based approach to finding an initial solution to a transportation problem. It makes allocations starting with the lowest shipping costs and moving in ascending order to satisfy the demands and supplies of all sources and destinations. This straightforward approach uses the following steps. Identify the cell with the lowest cost. Allocate as many units as possible to that cell without exceeding the supply or demand. Then cross out the row or column or both that is exhausted by the above assignment. Move on to the next lowest cost cell and allocate the remaining units. Repeat the above steps as long as all the demands and supplies are not satisfied.  When we use the Intuitive Approach to the Bengal Plumbing problem, we obtain the solution as below. Transportation Matrix for Bengal Plumbing From \ To Warehouse E Warehouse F War...
1 comment
Read more

Modified Distribution (MODI) Method

Modified Distribution (MODI) Method The MODI method is another way of evaluating the initial solution of a transportation problem and finding a more optimal solution with much less iterations compared to the Stepping Stones method. It allows us to compute improvement indices much quickly for each unused square without drawing all of the closed paths. MODI provides new means of finding the unused route with the largest negative improvement index. Once the largest index is identified, we are required to trace only one closed path. We can then decide the maximum number of units that can be shipped along that unused route. We begin with an initial solution obtained by the Northwest Corner Rule. Transportation Matrix for Bengal Plumbing From \ To Warehouse E Warehouse F Warehouse G Factory Capacity Plant A 100 Rs.50 Rs.40 Rs.30 100 Plant B ...
1 comment
Read more