8/12/2019 Procedure for DPT
2/4
LARSEN & TOUBRO LIMITED
PAGE NO.- 2 OF 4
DATE:-01.11.2007MSQ(EPCC 1) UP GRADATIONREV.NO.- 0
DPT PROCEDURE PROCEDURE NO.-
LT/MSQ/P/DPT//007
1.0 SCOPE:
This procedure describes the method for Penetrnt Testin! of
mteri"s nd #e"ds$ for structure
erection nd fbriction #or% of MSQ &'P(()1* up !rdtion
Pro+ect$ ,O(L Pnipt-
2-0 RE"ERENCE DOCUMENTS:
SM' Section ondestructi3e 'mintion
SM' 5.1-. (hemic" p"nt nd petro"eum refiner6 pipin!-
ST ecommended prctice ST)T()1
#.0 GENERAL
.-1 Penetrnt Testin! sh"" be pp"ied to detect discontinuities
tht re open to the surfce of nonferrous
nd other mteri"s- T6pic" defects #hich re detectb"e b6 this
method re surfce crc%s$ porosit6$
"mintions$ sems$ "ps etc-
.-2 Prior to emintion$ surfce to be chec%ed 3isu""6 nd d+cent re
sh"" be c"ened$ to ""o# the
pentrnt to enter the discontinuities-
$.0 QUALI"ICATION O" PERSONNEL
4-1 ,ndi3idu"s performin! penetrnt emintion sh"" be 8u"ified ST
"e3e"),, in ccordnce #ith
ST)T()1 or e8ui3"ent-
4-2 Trined Person m6 perform the testin! under Le3e" ,, 8u"ified
persons9 instruction nd super3ision-
%.0 M'*+,
:-1 "" DP mteri"s such s Penetrnt$ De3e"oper nd ("ener sh"" be
from the fo""o#in! reputed
mnufcturers- M!nf"u$ P Met$ F"# chec% ; Prdeep met" brnds re
cceptb"e-
:-2 5tch certifictes sh"" be submitted for re3ie# prior to
use-
APPROVED BY L & T REVIEWED APPROVED BY !ACOBS
8/12/2019 Procedure for DPT
4/4
LARSEN & TOUBRO LIMITED
PAGE NO.- 4 OF 4
DATE:-01.11.2007MSQ(EPCC 1) UP GRADATIONREV.NO.- 0
DPT PROCEDURE PROCEDURE NO.-
LT/MSQ/P/DPT//007
7.0 INTERPRETATION
7-1 ,nterprettion sh"" be done bet#een : to .0 minutes fter the
de3e"oper cotin! becomes dr6-
7-2 cceptnce stndrd sh"" be s per SM' 5 .1-. / (ontrct
specifiction- n6 defect found sh"" be
repired either b6 !rindin!$ chippin! or re)#e"din! if re8uired
or re test to be done #ith the bo3e
procedure in defecti3e re-
.0 POST CLEANING
fter the comp"etion of interprettion$ the re sh"" be c"ened
thorou!h"6 b6 cotton #ste so tht notrce of DPT mteri" "eft is "eft
out-
/.0 DOCUMENTATION
T ',' ,+', ,++ 3455 *6 "4' N4. LTMSQDPT01
10. SA"ETY
"" sfet6 precutions sh"" be t%en s per ?S' re8uirements of the
pro+ect-
APPROVED BY L & T REVIEWED APPROVED BY !ACOBS
