8/13/2019 The Lesson Learnt for Piping and Mechanical
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The lesson learnt for Piping and Mechanical:
There are some conflicts in specification which furnished by
client. But these differences
could not be found by during checking before award and during
preparation of drawings.
This mistake affected to engineering as well as construction so
much. .. . . So we
have to study carefully all specification and incorporate
between disciplines in project.
During checking P!D" we should pay more attention to #$ote%
below. These can affect
to &T'" specification" drawings (or e)ample" the length of
fle)ible hose was
determined in datasheet. *owever the connection from where to
where usually noted in
P!D. Based on these notes" the length of fle)ible hose can be
changed in comparison
with the length shown in data sheets. Sometimes the length too
short or too long is also
suitable for installation and operation.
During checking !sometric from client" we should update the
modifications and changes
in to + common P!D in order to control easily.
The performance &T' was no so good. There was still some
Top,up &T' due to low
contingency" wrong &T'" the changes lesson learnt for the
ne)t project by many
ways- ascending the contingency" the bulk material shall be /0
and add more /0 for
*12 line" and more 3 D* lines as contingency" and add more
gaskets for swing spool
!n the design stage" we have to take care to ensure the hydro
test can be done later. The
spool shall have the vent- drain 4flageolet and blind flange5 at
the pocket where water can
be trapped.
(or bolts at the joints where have insulation gasket or T67
should be longer than the
length as normally case. !n the !sometric drawings" the bolts"
nut and gaskets should be
put on *12 lines at tie in point between onshore and offshore in
order to avoid missing
material during fabrication onshore lines.
During review and incorporate vendor data" the orientation of
jack up rig shall be
considered in order to avoid clashing to the e8uipment"
instrument such as fire water
monitor" eye wash and shower" lighting 7lso pay more attention
for SP items. The
space around corrosion coupon has to be enough to connect
9etrieving Tool. (or
2ontinuous Drainers Trap" :e need do check carefully the
direction of flow for model inPD&S and installation correctly.
(lame 7rrestor location should be near the end of vent
boom to arrest the flame as soon as possible. (or manual valves"
e8uipment" the space
around them shall ade8uate for operation and maintenance.
:hen we establish the hydro test package register" to make sure
all of lines included in
this list. ;esson learn is the lines which connect to riser
4behind shutdown valve5 to be
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performed hydro test onshore despite of *12 lines name to ensure
one golden weld joint
only.
The connection joint inside e8uipment" especially is where
storing pressure" the flange
type must be used" no threaded type which is difficult for
repairing and replacement. The
self contain eye wash and shower is an e)ample. The leaking
found at many threadedconnection joints. !t takes time to repair
it.
The e8uipment lifting procedures were submitted late lead to
comments from client.
These procedures should be approved by client minimum one day
before lifting
e8uipment.
.
+. (or /? packages which scope supply of *;@'2 handover to P
