pressure drop charts - mrpex systems · pressure drop charts ... divide the pipe length by 10, ......
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PR
ESS
UR
E D
RO
P C
HA
RTS
1-800-716-3406 87
PR
ESS
UR
E D
RO
P F
OR
SM
ALL
PEX
TU
BIN
G A
T 10
0 F
›Ta
ke t
he t
otal
hea
t lo
ad (B
TUH
) for
the
are
a th
at t
he lo
op is
cov
erin
g an
d di
vide
it b
y 50
1. ›D
ivid
e th
e re
sult
with
the
Del
ta-T
to
find
GPM
for
the
loop
. ›Fi
nd t
he c
lose
st fl
ow f
or t
he lo
op in
the
left
GPM
col
umn
of t
he c
hart
. ›M
ove
to t
he ri
ght
to t
he c
orre
ct p
ipe
size
inte
rsec
ting
line.
›M
ove
dow
n to
read
to
read
the
pre
ssur
e dr
op p
er 1
0 fe
et o
f pi
pe.
›D
ivid
e th
e lo
op le
ngth
by
10, t
hen
mul
tiply
the
resu
lt w
ith t
he g
iven
pre
ssur
e dr
op f
or 1
0 fe
et t
o ge
t th
e to
tal p
ress
ure
drop
for
the
loop
.
NO
TE: T
his
char
t is
for
100
% w
ater
, and
onl
y in
clud
es t
he p
ress
ure
drop
for
the
PEX
pip
e its
elf.
You
need
to
add
the
drop
for
oth
er e
quip
men
t. Fo
r the
man
ifold
, ad
d ab
out
2 ft
/hd.
If g
lyco
l is
used
, use
the
cor
rect
ion
char
ts o
n pa
ges
92–9
3.
PRESSURE DROP CHARTS
PR
ESS
UR
E DR
OP C
HA
RTS
MRPEXSYSTEMS.COM88
PR
ESS
UR
E D
RO
P F
OR
LA
RG
E P
EX T
UB
ING
AT
100
F
›Fi
nd t
he c
lose
st fl
ow f
or t
he lo
op in
the
left
GPM
col
umn
of t
he c
hart
. ›St
ep 2
, Mov
e to
the
righ
t to
the
cor
rect
pip
e si
ze in
ters
ectin
g lin
e. ›St
ep 3
, Mov
e do
wn
to re
ad t
o re
ad t
he p
ress
ure
drop
per
10
feet
of
pipe
. ›St
ep 4
, Div
ide
the
pipe
leng
th b
y 10
, the
n m
ultip
ly t
he re
sult
with
the
giv
en p
ress
ure
drop
for
10
feet
to
get
the
tota
l pre
ssur
e dr
op f
or t
he p
ipe
leng
th.
NO
TE: T
his
char
t is
for
100
% w
ater
, and
onl
y in
clud
es t
he p
ress
ure
drop
for
the
PEX
pip
e its
elf.
You
need
to
add
the
drop
for
oth
er e
quip
men
t. If
glyc
ol is
use
d, u
se t
he
corr
ectio
n ch
arts
on
page
s 92
–93.
PR
ESS
UR
E D
RO
P C
HA
RTS
1-800-716-3406 89
PR
ESS
UR
E D
RO
P F
OR
PA
P T
UB
ING
AT
100
F
›Ta
ke t
he t
otal
hea
t lo
ad (B
TUH
) for
the
are
a th
at t
he lo
op is
cov
erin
g an
d di
vide
it b
y 50
1. ›St
ep 2
, Div
ide
the
resu
lt w
ith t
he D
elta
-T t
o fin
d G
PM f
or t
he lo
op.
›St
ep 3
, Fin
d th
e cl
oses
t flo
w f
or t
he lo
op in
the
left
GPM
col
umn
of t
he c
hart
. ›St
ep 4
, Mov
e to
the
righ
t to
the
cor
rect
pip
e si
ze in
ters
ectin
g lin
e. ›St
ep 5
, Mov
e do
wn
to re
ad t
o re
ad t
he p
ress
ure
drop
per
10
feet
of
pipe
. ›St
ep 5
, Div
ide
the
loop
leng
th b
y 10
, the
n m
ultip
ly t
he re
sult
with
the
giv
en p
ress
ure
drop
for
10
feet
to
get
the
tota
l pre
ssur
e dr
op f
or t
he lo
op.
NO
TE: T
his
char
t is
for
100
% w
ater
, and
onl
y in
clud
es t
he p
ress
ure
drop
for
the
PAP
pip
e its
elf.
You
need
to
add
the
drop
for
oth
er e
quip
men
t. Fo
r the
man
ifold
, add
abo
ut 2
ft/
hd. I
f gl
ycol
is u
sed,
use
the
cor
rect
ion
char
ts o
n pa
ges
92–9
3.
PR
ESS
UR
E DR
OP C
HA
RTS
MRPEXSYSTEMS.COM90
PR
ESS
UR
E D
RO
P F
OR
CO
PP
ER T
UB
ING
AT
100
F
›Fi
nd t
he c
lose
st fl
ow f
or t
he lo
op in
the
left
GPM
col
umn
of t
he c
hart
. ›St
ep 2
, Mov
e to
the
righ
t to
the
cor
rect
pip
e si
ze in
ters
ectin
g lin
e. ›St
ep 3
, Mov
e do
wn
to re
ad t
o re
ad t
he p
ress
ure
drop
per
10
feet
of
pipe
. ›St
ep 4
, Div
ide
the
pipe
leng
th b
y 10
, the
n m
ultip
ly t
he re
sult
with
the
giv
en p
ress
ure
drop
for
10
feet
to
get
the
tota
l pre
ssur
e dr
op f
or t
he p
ipe
leng
th.
NO
TE: T
his
char
t is
for
100
% w
ater
, and
onl
y in
clud
es t
he p
ress
ure
drop
for
the
cop
per p
ipe
itsel
f. Yo
u ne
ed t
o ad
d th
e dr
op f
or o
ther
equ
ipm
ent.
If gl
ycol
is u
sed,
use
the
co
rrec
tion
char
ts o
n pa
ges
92–9
3.
PR
ESS
UR
E D
RO
P C
HA
RTS
1-800-716-3406 91
CV V
ALU
ESTh
e pr
essu
re d
rop
for h
ydro
nic
heat
ing
com
pone
nts
are
norm
ally
des
crib
ed b
y th
eir C
v val
ue. T
he C
v val
ue d
escr
ibes
at
wha
t flo
w (i
n gp
m) t
he p
ress
ure
drop
ove
r the
co
mpo
nent
will
be 1
psi
(equ
al t
o 2.
31 f
t/hd
). Ch
eck
with
the
man
ufac
ture
r for
the
Cv v
alue
of
the
com
pone
nt a
nd t
hen
use
form
ula
belo
w t
o es
tabl
ish
the
head
loss
(ft/
hd).
HEA
D L
OSS
(FT.
HD
.) O
VER
VALV
ES E
TC.:
(1.5
2 x
GPM
/ Cv
)2 (G
PM is
the
flow
, and
Cv
is t
he v
alve
par
amet
er)
(Mul
tiply
the
flow
by
1.52
and
then
div
ide
by t
he C
v va
lue.
Mul
tiply
the
resu
lt by
itse
lf)
PR
ESS
UR
E DR
OP C
HA
RTS
MRPEXSYSTEMS.COM92
PR
ESS
UR
E H
EAD
CO
RR
ECTI
ON
FA
CTO
R F
OR
TEM
PER
ATU
RES
AN
D P
RO
PY
LEN
E G
LYC
OL
Pres
sure
hea
d co
rrec
tion
fact
or (m
ultip
lier)
as a
fun
ctio
n of
ave
rage
flui
d te
mpe
ratu
re (°
F) a
nd p
ropy
lene
gly
col c
once
ntra
tion
(Vol
ume
%).
Usi
ng t
he C
hart
: ›Fi
nd t
he a
vera
ge w
ater
tem
pera
ture
to
the
left
›M
ove
horiz
onta
lly t
o th
e rig
ht u
ntil
the
inte
rsec
tion
with
act
ual g
lyco
l con
cent
ratio
n ›G
o do
wn
vert
ical
ly a
nd re
ad t
he fl
ow c
orre
ctio
n fa
ctor
›M
ultip
ly t
he h
ead
loss
(ft/
hd) w
ith t
he c
orre
ctio
n fa
ctor
for
cor
rect
resu
lt
PR
ESS
UR
E D
RO
P C
HA
RTS
1-800-716-3406 93
FLO
W C
OR
REC
TIO
N F
AC
TOR
FO
R T
EMP
ERAT
UR
ES A
ND
PR
OP
YLE
NE
GLY
CO
LFl
ow c
orre
ctio
n fa
ctor
(mul
tiplie
r) as
a f
unct
ion
of a
vera
ge fl
uid
tem
pera
ture
(°F)
and
pro
pyle
ne g
lyco
l con
cent
ratio
n (V
olum
e %
).
Usi
ng t
he C
hart
: ›Fi
nd t
he a
vera
ge w
ater
tem
pera
ture
to
the
left
›M
ove
horiz
onta
lly t
o th
e rig
ht u
ntil
the
inte
rsec
tion
with
act
ual g
lyco
l con
cent
ratio
n ›G
o do
wn
vert
ical
ly a
nd re
ad t
he fl
ow c
orre
ctio
n fa
ctor
›M
ultip
ly t
he fl
ow (G
PM) w
ith t
he c
orre
ctio
n fa
ctor
for
cor
rect
resu
lt
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