FORMULAS

Frequently used formulas in pipeline construction;


1. h = f(LV2/2Dg)


h : Head loss (m)
L : Length of pipeline (m)
D: Diameter of pipe (m)
(Normally nominal diameter presented in meter is used.)
V: Flow velocity (m/s)
g : Acceleration of gravity (= 9.8 m/s2)
f : Head loss coefficient

2. For water pipeline, Hazen-Williams formula is commonly used.
V = 0.35464CH D0.63 I0.54
Q = 0.27853CH D2.63 I0.54

I = 10.666 CH-1.85 D-4.87 Q1.85 


Where, CH : Coefficient
For cement mortar or epoxy lined ductile iron pipe, a CH value of 150 can
be used; however for design purpose, 130 is recommended, which
includes losses in fittings, valves and other facilities, plus some
allowance.
I : Hydraulic gradient (unit head loss of the pipeline) = h/L
Q : Flow volume (m3/s)

Comments

Post a Comment

Popular posts from this blog

SAFETY FIRST

"Safety First" "Safety First" "Safety First". Yes readers, today I will share something about the construction site safety precautions. As construction is a wide thing it consists different kinds of work. So safety measures vary with it's kinds though there is some common thing like workers safety, third party safety etc. Here I will tell about the safety practices which are very important in water pipeline construction( specially Ductile Iron Pipe).   At first, around the working area safety pools and tape should be properly placed and after ensuring this by site manager work will be started. Third party is not allowed within the working perimeters.   # Worker's Safety: This is the most important thing, because without them construction work is impossible. Helmets, safety shoes, gloves and vest (safety belt and life jacket, if needed) must be worn by the worker and these things should be confirmed by safety manager of the site. Workers in hi...
Read more

LIFE CYCLE OF DI WATER PIPELINE

Every living/nonliving thing has a life cycle. Life cycle is a very important thing in construction work because all construction works start with a huge investment. So constructed structure must provide  service for a certain period of time. The service life of structure widely depends on it's construction method, quality of work, actions on it during service life, environmental effects, changes done during it's service life, regular maintenance (not major repair). To know about the life cycle of water pipeline first I want say something about the construction material of pipeline. As we discussing about the life cycle of DI (Ductile Iron) pipeline so here I will write about Ductile Iron. Ductile iron also known as ductile cast iron as it is advanced form of cast iron. Ductile iron retains not only all cast iron qualities but also provides more strength,toughness and ductility. The chemical composition of ductile iron is carbon, silicon, manganese, magnesium, phosphorus,...
Read more