Answer / baskar

If it is a gas then the pressure will reduce to half .Use
the below gas equation,

p1/p2 = v1/v2

If it is an incompressible fluid,also the pressure gets
reduced.Then the major loss of energy in pipe is caused by
friction in pipe.It may be computed by Darcy-weisbach
equation.

Head loss due to friction hf = 4fLV2/2gD

where,
f= friction factor
L=length of pipe
v=velocity of the fluid
D=diameter of the pipe

If L is doubled obviously friction increases and therfore
the pressure is reduced.

Answer / venkatesh a

In pipes lines,As per the pascal law "even though the length is increased pressure will be the constant, if the pipe is not having any leakage".

Flow rate only can decrease with respect to the length as mentioned in answer-3.

Answer / abhinav

reduce

Answer / sachin khandait

there will be only some frictional losses in the pipe if
it horizontal and the pipe is uniform throuout.

Answer / guest

halved

Answer / rahaman

p1-p2=32uvl/d
if length is doubled the pressure drop also gets doubled

Answer / junaid_1215

It will be half of last value

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