Hydrocarbon Processing - February 2021 - 15

Reliability

HEINZ P. BLOCH, RELIABILITY/EQUIPMENT EDITOR
Heinz.Bloch@HydrocarbonProcessing.com

Plan startups wisely and involve SMEs
DE, a retired former colleague of mine, recounted his experience as an expert witness for ABC in litigation against XYZ.
(Note that I picked the letters A through M for the plaintiff 's
side; N through Z are assigned to the defendants.) Defendant
XYZ was an overly optimistic, perhaps moderately negligent,
supplier of bulk raw material to ABC, the plaintiff. The plaintiff 's profitability depended on the uninterrupted flow of raw
material from XYZ, which was the manufacturer of malfunctioning turbomachines that were clearly involved. The startup
was delayed, and the unforeseen consequential losses for ABC
were far-reaching.
ABC had hired DE as its expert machinery reliability witness.
In his role, DE had to explain to the litigants what ailed the big
process machines and why these, or similar large compressors
and steam turbines (FIG. 1), are known to operate well elsewhere.
DE and his contributing colleague, FG, uncovered little or no
data on the success or failure of whatever actions XYZ's machinery engineers had taken to get satisfactory performance from the
machines at XYZ. However, the plaintiff 's team did not uncover
any documents indicating how XYZ's owners had determined
labor requirements to support equipment startup efforts.
Be this as it may, DE and FG began poring over thousands
of documents after being engaged by the law firm representing
ABC. To make a long story short: XYZ had failed to meet its
contractual obligation to deliver bulk raw material to ABC because the very large turbomachinery trains failed during startup.
The two parties settled out of court after it became clear that
XYZ had revamped its major machinery trains and missed the
startup deadline by a significant period of time. The company
had been warned well ahead of time that its fast-track startup
schedule was unrealistic. Unsurprisingly, defendant XYZ had
encountered several troubles stemming from mechanical problems with a reputable manufacturer's machines. The dry gas
seals in its compressors had failed because no one had paid attention to the steam turbines' slow-rolling requirement. General organizational disarray was evident; organizational disarray
is often caused by too many cooks spoiling an entire meal.
No access to management. For hydrocarbon processing

plants to thrive, subject matter experts (SMEs) must have direct
access to upper management. If their findings and concerns are
being filtered by the various layers between persons empowered
to make risky decisions and those enabled to offer sound experience-based advice, the tracks are set for a collision with reality.
" As a matter of fact, " said DE a year later, " I was offered up to
XYZ's executive VP, along with another machinery SME, to do
a one-day cold-eye review of this fiasco. The VP was sent to the
facility to determine if corporate headquarters would authorize
the plant to attempt a restart. ABC was also in a bad way due to

FIG. 1. Large steam turbine driving a turbocompressor.

XYZ not delivering bulk raw material per their contract, and the
issue even drew regional newspaper headlines. "
DE recalled that the seal gas piping for the dry gas seals had
been fabricated from carbon steel and had not been cleaned after
installation. All of the dry gas seals failed on startup. The compressor manufacturer made its share of mistakes and could never
deliver the unrealistic schedule outlined by XYZ. It was suspected that the schedule had been determined using a proposal
made by KLM, an experienced vendor that had issued a bid not
favored by XYZ. Instead, XYZ had bought machines from NOP
and then expected its staffers to perform like KLM.
The various defendants also had internal problems. Although
not quite obvious, the reviewing SMEs sensed that there had
been dissent regarding the schedule. Regrettably, their cultures
did not allow for the voicing of divergent opinions and, during
the discovery phase of litigation, DE and FG found no potentially " career-limiting " remarks. Yet, their overall impression of a
startup gone wrong was supported by an entry from NOP's field
service engineer: " I don't feel the love... "
The two reviewers were left with the impression that everybody towed the line, and one of the two is now putting the finishing touches on a 300-plus page book on the topic of how to implement a successful startup. It will offer a great number of detailed
startup checklists to those who are willing to read and listen.
HEINZ P. BLOCH resides in Montgomery, Texas. His professional
career commenced in 1962 and included long-term
assignments as Exxon Chemical's Regional Machinery
Specialist for the U.S. He has authored or co-written
more than 800 publications, among them 23 books devoted
to reliability improvement. A recent one, titled, Fluid Machinery:
Life Extension of Pumps, Gas Compressors and Drivers,
was published in June 2020 by DeGruyter (Berlin, Germany). It describes
many equipment-related steps of interest to reliability professionals.
Hydrocarbon Processing | FEBRUARY 2021 15



Hydrocarbon Processing - February 2021

Table of Contents for the Digital Edition of Hydrocarbon Processing - February 2021

Contents
Hydrocarbon Processing - February 2021 - Cover1
Hydrocarbon Processing - February 2021 - Cover2
Hydrocarbon Processing - February 2021 - Contents
Hydrocarbon Processing - February 2021 - 4
Hydrocarbon Processing - February 2021 - 5
Hydrocarbon Processing - February 2021 - 6
Hydrocarbon Processing - February 2021 - 7
Hydrocarbon Processing - February 2021 - 8
Hydrocarbon Processing - February 2021 - 9
Hydrocarbon Processing - February 2021 - 10
Hydrocarbon Processing - February 2021 - 11
Hydrocarbon Processing - February 2021 - 12
Hydrocarbon Processing - February 2021 - 13
Hydrocarbon Processing - February 2021 - 14
Hydrocarbon Processing - February 2021 - 15
Hydrocarbon Processing - February 2021 - 16
Hydrocarbon Processing - February 2021 - 17
Hydrocarbon Processing - February 2021 - 18
Hydrocarbon Processing - February 2021 - 19
Hydrocarbon Processing - February 2021 - 20
Hydrocarbon Processing - February 2021 - 21
Hydrocarbon Processing - February 2021 - 22
Hydrocarbon Processing - February 2021 - 23
Hydrocarbon Processing - February 2021 - 24
Hydrocarbon Processing - February 2021 - 25
Hydrocarbon Processing - February 2021 - 26
Hydrocarbon Processing - February 2021 - 27
Hydrocarbon Processing - February 2021 - 28
Hydrocarbon Processing - February 2021 - 29
Hydrocarbon Processing - February 2021 - 30
Hydrocarbon Processing - February 2021 - 31
Hydrocarbon Processing - February 2021 - 32
Hydrocarbon Processing - February 2021 - 33
Hydrocarbon Processing - February 2021 - 34
Hydrocarbon Processing - February 2021 - 35
Hydrocarbon Processing - February 2021 - 36
Hydrocarbon Processing - February 2021 - 37
Hydrocarbon Processing - February 2021 - 38
Hydrocarbon Processing - February 2021 - 39
Hydrocarbon Processing - February 2021 - 40
Hydrocarbon Processing - February 2021 - 41
Hydrocarbon Processing - February 2021 - 42
Hydrocarbon Processing - February 2021 - 43
Hydrocarbon Processing - February 2021 - 44
Hydrocarbon Processing - February 2021 - 45
Hydrocarbon Processing - February 2021 - 46
Hydrocarbon Processing - February 2021 - 47
Hydrocarbon Processing - February 2021 - 48
Hydrocarbon Processing - February 2021 - 49
Hydrocarbon Processing - February 2021 - 50
Hydrocarbon Processing - February 2021 - 51
Hydrocarbon Processing - February 2021 - 52
Hydrocarbon Processing - February 2021 - 53
Hydrocarbon Processing - February 2021 - 54
Hydrocarbon Processing - February 2021 - 55
Hydrocarbon Processing - February 2021 - 56
Hydrocarbon Processing - February 2021 - 57
Hydrocarbon Processing - February 2021 - 58
Hydrocarbon Processing - February 2021 - 59
Hydrocarbon Processing - February 2021 - 60
Hydrocarbon Processing - February 2021 - 61
Hydrocarbon Processing - February 2021 - 62
Hydrocarbon Processing - February 2021 - 63
Hydrocarbon Processing - February 2021 - 64
Hydrocarbon Processing - February 2021 - 65
Hydrocarbon Processing - February 2021 - 66
Hydrocarbon Processing - February 2021 - 67
Hydrocarbon Processing - February 2021 - 68
Hydrocarbon Processing - February 2021 - 69
Hydrocarbon Processing - February 2021 - 70
Hydrocarbon Processing - February 2021 - 71
Hydrocarbon Processing - February 2021 - 72
Hydrocarbon Processing - February 2021 - 73
Hydrocarbon Processing - February 2021 - 74
Hydrocarbon Processing - February 2021 - 75
Hydrocarbon Processing - February 2021 - 76
Hydrocarbon Processing - February 2021 - 77
Hydrocarbon Processing - February 2021 - 78
Hydrocarbon Processing - February 2021 - 79
Hydrocarbon Processing - February 2021 - 80
Hydrocarbon Processing - February 2021 - 81
Hydrocarbon Processing - February 2021 - 82
Hydrocarbon Processing - February 2021 - 83
Hydrocarbon Processing - February 2021 - 84
Hydrocarbon Processing - February 2021 - GP-1
Hydrocarbon Processing - February 2021 - GP-2
Hydrocarbon Processing - February 2021 - GP-3
Hydrocarbon Processing - February 2021 - GP-4
Hydrocarbon Processing - February 2021 - GP-5
Hydrocarbon Processing - February 2021 - GP-6
Hydrocarbon Processing - February 2021 - GP-7
Hydrocarbon Processing - February 2021 - GP-8
Hydrocarbon Processing - February 2021 - GP-9
Hydrocarbon Processing - February 2021 - GP-10
Hydrocarbon Processing - February 2021 - GP-11
Hydrocarbon Processing - February 2021 - GP-12
Hydrocarbon Processing - February 2021 - GP-13
Hydrocarbon Processing - February 2021 - GP-14
Hydrocarbon Processing - February 2021 - GP-15
Hydrocarbon Processing - February 2021 - GP-16
Hydrocarbon Processing - February 2021 - GP-17
Hydrocarbon Processing - February 2021 - GP-18
Hydrocarbon Processing - February 2021 - GP-19
Hydrocarbon Processing - February 2021 - GP-20
Hydrocarbon Processing - February 2021 - GP-21
Hydrocarbon Processing - February 2021 - GP-22
Hydrocarbon Processing - February 2021 - GP-23
Hydrocarbon Processing - February 2021 - GP-24
Hydrocarbon Processing - February 2021 - GP-25
Hydrocarbon Processing - February 2021 - GP-26
Hydrocarbon Processing - February 2021 - GP-27
Hydrocarbon Processing - February 2021 - GP-28
Hydrocarbon Processing - February 2021 - GP-29
Hydrocarbon Processing - February 2021 - GP-30
Hydrocarbon Processing - February 2021 - GP-31
Hydrocarbon Processing - February 2021 - GP-32
Hydrocarbon Processing - February 2021 - GP-33
Hydrocarbon Processing - February 2021 - GP-34
Hydrocarbon Processing - February 2021 - GP-35
Hydrocarbon Processing - February 2021 - GP-36
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hpi-market-data-2024-v2
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hpi-market-data-2024
https://www.nxtbook.com/gulfenergyinfo/gulfpub/gas-processes-handbook-2022_v2
https://www.nxtbook.com/gulfenergyinfo/gulfpub/gas-processes-handbook-2022
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hp_202212
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hpi-market-data-2023-v2
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hpi-market-data-2023
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hp_202211
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202210
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202209
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202208
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202207_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202207
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202206_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202206
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202205_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202205
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202204_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202204
https://www.nxtbook.com/nxtbooks/gulfpub/hp_032022
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202203
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202202
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202201
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202112
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202111
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202110
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2022_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2022
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202109
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202108
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_processes_handbook_2021_v2
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_processes_handbook_2021
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202107
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202106
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202105
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202104
https://www.nxtbook.com/nxtbooks/gulfpub/hp_ebooks
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202103
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202102
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202101
https://www.nxtbook.com/nxtbooks/gulfpub/catalyst_handbook_2020_v2
https://www.nxtbook.com/nxtbooks/gulfpub/catalyst_handbook_2020
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202012
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202011
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202010
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2021
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202009
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202008
https://www.nxtbook.com/nxtbooks/gulfpub/refining_processes_handbook_2020
https://www.nxtbook.com/nxtbooks/gulfpub/refining_processes_handbook_2020_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202007
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202006
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202005
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202004
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202003
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202002
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202001
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201912
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201911
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2020_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2020
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201910
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201909
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201908
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201907
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201906
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201905
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201904
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201903
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201902
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201901
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_2018_v2
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_2018
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201812
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2019_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2019
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201811
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201810
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201809
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201808
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201807
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201806
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201805
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201804
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201803
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201802
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201801
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201712
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201711
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201710
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201709
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201708
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201707
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201706
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201705
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201704
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201703
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201702
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201701
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2017mediaplanner
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201612
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201611
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201610
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201609
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201608
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201607
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201606
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201605
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201604
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201603
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201602
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201601
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201512
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201511
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201510
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2016mediaplanner
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201509
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201508
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201507
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2015tmsd
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201506
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201505
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201504
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201503
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201502
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201501
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201412
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201411
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2015mediaplanner
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201410
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201409
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201408
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201407
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2014petrochemicalprocesses_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2014petrochemicalprocesses
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201406
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201405
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201404
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201403
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2014calendar
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201402
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201401
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201312
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2014mediaplanner
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201311
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201310
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201309
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201308
https://www.nxtbook.com/nxtbooks/gulfpub/hp_srsguide2013
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201307
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201306
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201305
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201304
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201303
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201302
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201301
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201212
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201211
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201210
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201209
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201208
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201207
https://www.nxtbook.com/nxtbooks/gulfpub/hp_srsguide2012
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201206
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201205
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201204
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201203
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201202
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201201
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201112
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201111
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201110
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201109
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201108
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201107_srsguide
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201107
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201106
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201105
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201104
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201103
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201102
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201101
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201012
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201011
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201010
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201009
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201008
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201007
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201006
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201005
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201004
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201003
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201002
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201001
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200912
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200911
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200910
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200909
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200908
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200907
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200906
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200905
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200904
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200903
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200902
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200901
https://www.nxtbookmedia.com