STATIONARY ENGINEER EXAM
QUESTIONS AND ANSWERS
How9bmuch9bclearance9bfrom9bthe9btop9bof9bthe9bboiler9bis9bneeded9bfor9ba9bHP9bboiler9btha
t9bproduces9b700009blbs9bof9bsteam?9b-9bANSWERS--79bfeet
On9ba9bgas9bfired9bboiler9bwhat9bis9bthe9bproper9bgas9bto9bair9bmixture9b-9bANSWERS--
30%-70%9band
in9bspecial9barrangements9bit9bcan9bbe9bas9bhigh9bas9b100%9b.9bANSWER9bCHAPTER9b
9b
119bremember%
What9bis9bthe9btotal9bhardness9bin9ba9bsystem9bthat9bwas9bfound9bto9bhave9bcalcium9bhard
ness9bof9b60ppm9band9bmagnesium9bhardness9bof9b18ppm9band9bcarbon9bhardness9bof9b
129bppm?9b-9bANSWERS--TH=(Ca9bx9b2.5)9b+9b(Mg9bx9b4.1)\
nTH=(609bx9b2.5)9b+9b(189bx9b4.1)\nTH=9b150+73.89b=(9b223.89bPPM)
How9boften9bshould9ba9bcomplete9bexternal9binspection9bof9bthe9bboiler9bbe9bdone?9b-
9bANSWERS--Once9ba9bShift
With9b249bhr9boperation9bhow9boften9bdo9byou9bcheck9bthe9bwater9blevel?9b-9bANSWERS--
Once9bper9bshift
How9boften9bdo9byou9bcheck9bthe9bLWCO?9b-9bANSWERS--Once9bper9bshift
How9boften9bdo9byou9bcheck9bthe9bHigh9bLimit9bSwitch?9b-9bANSWERS--Annually
A9b2"9bpipe9bwas9bfound9bto9bbe9bdelivering9bwater9bat9b1009bpsia9bat9b1040ft9bper9bsecond
.9bHow9bmany9bgallons9bper9bhour9bwill9bit9bdeliver?9b-9bANSWERS--
GPM=9bV9b(diameter9bsquared)9bdivided9bby9b.40859bANSWER9bpg9b4699bBOG
What9bcontrols9bthe9bamount9bof9bblowback9bon9ba9bsafety9bvalve?9b-9bANSWERS--
Blowback9bring9bor9badjusting9bring
On9ba9bopen9bair9bexpansion9btank9bhot9bwater9bboiler9bsystem;9bhow9bhigh9bshould9bit9bbe
9bmounted?9b-9bANSWERS--(49bFeet9b)9babove9bthe9bhighest9bheating9belement.
What9bis9bthe9bminimum9btop9bclearance9bof9bboilers9bwith9bmanholes?9b-9bANSWERS--
59bfeet
Package9bboilers;9bsteam9bheating9bboilers9band9bhot9bwater9bheating9bboilers9bshall9bhav
e9ba9bminimum9bclearance9bof?9b-9bANSWERS--
29bfeet9bfrom9bceiling.9bCode9bchapter9b109bpage76
Most9bimportant9bsafety9bdevice9bon9ba9bboiler?9b-9bANSWERS--Safety9brelief9bvalve
,What9bdoes9ba9bBlack9bLiquor9bBoiler9bdo?9b-9bANSWERS--
Black9bLiquor9bis9bthe9bby9bproduct9bof9bwood9bpulp9bprocessing9bin9bthe9bpaper9bmaking9b
industry.
What9bdoes9bBlack9bliquor9bboiler9bknown9bfor?9b-9bANSWERS--
Steam9bgeneration9band9brecovery9bof9bsoda9bash
Maximum9bline9bvoltage9bfor9bcontrol9bon9ba9bboiler?9b-9bANSWERS--1509bvolts
Under9bwhat9bcode9bare9bboilers9bdesigned9band9bconstructed?9b-9bANSWERS--ASME-
9bCSD9b1
How9bmany9blow9bwater9bcut9boffs9bare9bneeded9bper9bcode9bfor9ba9bhot9bwater9bsystem9bw
hen9ba9bboiler9bhas9binputs9bgreater9bthan9b400,0009bbtu9bper9bhr9b-9bANSWERS--
19bLWCO9bis9bneeded.
What9bis9bthe9bminimum9band9bmaximum9bsize9bfor9ba9bsafety9bvalve9bper9bcode9bfor9bboil
ers?9b-9bANSWERS--Minimum9b3/4"9band9bMaximum9b49b1/2"
What9bstamp9bis9bput9bon9ba9bboiler9bafter9brepairs?9b-9bANSWERS--"R"
What9bis9bthe9bequalizing9bsystem9bused9bfor?9b-9bANSWERS--
The9bequalizing9bsystem9bis9bfor9bwarming9bup9bthe9bsteam9blead.
A9bblowdown9bvalve9bis9blocated9bat9bthe9blowest9bwater9bspace9bof9ba9bboiler9bfor9bthree9b
purposes9b-9bANSWERS--1.9bto9bremove9bprecipitated9bsludge9bor9bloose9bscale9b\
n2.9bTo9bpermit9brapid9blowering9bof9bthe9bboiler9bwater9bif9bit9bhas9bbecome9btoo9bhigh9bac
cidentally9b\
n3.9bAs9ba9bmeans9bof9bremoving9bwater9bfrom9bthe9bboiler9bso9bthat9bfresh9bwater9bmay9bb
e9badded9bto9bkeep9bthe9bconcentration9bof9bsolids9bbelow9bthe9bpoint9bwhere9bdifficulties9
bmay9bbe9bexperienced.
In9bthe9bold9bpower9bboiler9bwhich9btype9bof9bfeed-water9bregulators9bwere9bnot9bused?9b-
9bANSWERS--Electronic
After9bopening9ba9bboiler9bfor9brepairs9bhow9bmuch9boxygen9bis9bneeded?9b-
9bANSWERS--19%
What9bis9bthe9bfirst9bthing9byou9bdo9bwhen9bshutting9bdown9ba9bboiler?9b-9bANSWERS--
Turn9boff9b(extinguish9bfire)
What9bis9bthe9blegal9blimit9bof9bacceptable9basbestos9bparticles9b?9b-9bANSWERS--
0.19bfibers9bper9bcubic9bcentimeter
What9bis9bCREEP?9b-9bANSWERS--
Creep9bis9bdefined9bas9bthe9bslow9bdeformation9bof9bmaterial9bwith9btime;9bwith9bthe9bdefor
mation9btaking9bplace9bat9belevated9btemperatures9bwith9bno9bincrease9bin9bstress.
What9bis9bthe9bBTU9bcontent9bof9bAnthracite9bcoal?9b-9bANSWERS--140009bbtu/lb
,What9bsubstance9btransfers9belectrical9bcurrent9bin9ba9bphotocell?9b-9bANSWERS--
Electricity9bwill9bflow9bwhen9bthe9bCADMIUM9bis9bexposed9bto9bsufficient9blight.
What9bdevice9bacts9bas9ba9bcheck9bvalve9bin9bboth9bdirections9band9bkeeps9bpumps9bprim
ed?9b-9bANSWERS--
FOOT9bVALVES9bare9bused9bfor9bpumps9bunder9bsuction9bpressure9bto9bprevent9bbackflo
w9bprimed?9bon9bthe9bsuction9bline.
What9bprotects9bboilers9bfrom9bexplosion9bin9bthe9bfurnace?9b-9bANSWERS--
A9bflame9bguard9bsystem9bis9ban9barrangement9bof9bflame9bdetection9bsystem;9binterlocks
;9band9brelays9bwhich9bwill9bsense9bthe9bpresence9bof9ba9bproper9bflame9bin9ba9bfurnace9ban
d9bcause9bfuel9bto9bbe9bshut9boff9bto9bthe9bfurnace9bif9ba9bhazardous9bcondition9bdevelops9b
(improper9bflame9bor9bcombustion).
What9bsize9bpipe9bis9bused9bas9ba9bheader9bin9ba9bboiler9boperating9bat9b100psi?9b-
9bANSWERS--69binches
What9bdevice9bis9bused9bto9bmeasure9bflue9bgasses9b-9bANSWERS--
The9bOrsat9bAnalyzer
Which9blow9bwater9bcut9boff9bdoes9bnot9bhave9ba9bmercury9bswitch?9b-9bANSWERS--
The9bSubmerged9belectrode9btype
What9bis9bthe9bbtu9boutput9bper9blb9bof9b#49bfuel9boil?9b-9bANSWERS--18
What9bsubstance9bis9bused9bfor9bthe9belectric9btransmission9bin9ban9bRTD?9b-
9bANSWERS--Platinum9bis9bused9bbecause9bof9bits9bstability9bat9bhigh9btemperatures
How9bmuch9bair9bis9bneeded9bfor9bthe9bcombustion9bof9bpulverized9bcoal;9bgas;9boil?9b-
9bANSWERS--50%9bfor9bcoal9band9b10-30%9bfor9bgas9b&9boil
In9bold9bpower9bboilers9bwhich9btype9bof9bfeedwater9bregulators9bwere9bnot9bused?9b\
n(A)9bhydraulic9b\n(B)9bfloat9b\n(C)9bthermostatic9bexpansion9b\n(D)9belectronic9b-
9bANSWERS--ANSWER9bD9belectronic/electro-magnetic
What9bis9bhard9bforming9bscale?9b-9bANSWERS--Silica
With9bhydroxide9bpresent9band9bnormal9boxygen9blevels9bwhich9bchemical9bwill9bcause9bp
roblems?9b-9bANSWERS--Chlorine
The9bresult9bfrom9bsteel9bmanufacturing9band9bunder9bpressure9bin9bboilers9btends9bto9bca
use9bbuldging?9bA9bbuldge9bis9bcaused9bby9b?9b-9bANSWERS--
A9bbuldge9bis9bcaused9bby9boverheating9bof9bthe9bshell9bplates9band9bit9baffects9bthe9bentir
e9bthickness9bof9bthe9bplate.
A9bblister9bis9bcaused9bby9bwhat9b?9b-9bANSWERS--
Slag9binclusion9bforming9ba9blamination9bat9bthe9btime9bthe9bplate9bwas9brolled9bat9bthe9bste
el9bmill.9bA9bblister9bis9ba9bseparation9bof9bthe9bmetal9bfrom9bthe9bshell9bplate9bcaused9bby9bi
mpurities9brolled9binto9bthe9bshell9bplate9bwhen9bformed.
, With9bnormal9boxygen9band9blow9balkalinity.9bwhat9bis9badded9bto9bthe9bboiler9bwater?9b-
9bANSWERS--Neutralizing9bAmines
Which9bchemical9bis9bused9bto9bcombat9bscale?9b-9bANSWERS--
Combined9bphosphate9btreatment-9bsodium9bphosphate
Other9bthan9bsulfite9bwhat9bchemical9bis9bused9bto9bcombat9bcorrosion9bin9bboilers?9b-
9bANSWERS--Hydrazine
What9bwill9bneutralize9bacid?9b-9bANSWERS--Alkali9band9bLime9bSoda
What9bmechanical9bdevice9bis9bused9bto9bremove9bscale9bfrom9bfiretubes?9b-
9bANSWERS--A9btube9brattler9bor9bvibrator
What9bpercentage9bof9bthe9bpressure9bshould9ba9bboiler9bhave9bbefore9byou9btest9bthe9blev
er9bof9ba9bsafety9bvalve?9b-9bANSWERS--75%
Where9bis9binternal9bcorrosion9bmost9blikely9bto9boccur9bon9ba9bvertical9btube9bboiler?9b-
9bANSWERS--Water9bleg-Mud9bleg
What9bare9bthe9bminimum9band9bmaximum9bsizes9bpermitted9bfor9bblow9bdown9bvalves9bo
r9bconnections?9b-9bANSWERS--3/4"minimum9b29b½9b"9bmaximum
A9bboiler9boperating9bat9ba9bpressure9bof9b65lbs.9bWhat9bis9bthe9bsmallest9bsize9bfeed9band
9bblow9boff9bconnections9bif9bthe9bsafety9bvalve9bis9bset9bat9b909bpsi?9b-9bANSWERS--
½9b"9bfeed9b¾9b"9bblow9boff
How9boften9bshould9bwater9bcolumns9band9bwater9bglass9blevels9bbe9bchecked9bon9ba9bhig
h9bpressure9bboiler?9b-9bANSWERS--(Once9bA9bShift)\
nAt9bthe9bbeginning9bof9beach9bshift9b-9bbeginning9bof9bthe9bwork9beffort
What9btakes9bno9bactual9baction9bchemical9bpart9bin9bcombustion?9b-9bANSWERS--
Nitrogen
How9bmany9bppm9bof9bEDTA9bare9bneeded9bto9btie9bup9b1ppm9bof9bhardness?9b-
9bANSWERS--
EDTA9brequires9b10ppm9bof9bEDTA9band9b59bNTA9bto9btie9bup9beach9b1ppm9bhardness.
On9ba9bpackage9bboiler;9bhow9bmany9bways9bcould9bcause9bfire9bpuffs9bwhen9bit9bis9bstarte
d9bup?9b-9bANSWERS--69bways9b1-poor9bstarting9bdraft9b2-incorrect9bfirebox9b3-
wrong9bburner9bnozzle9b4-lean9bfire9b5-
9binsufficient9bgas9bpilot9bor9bexcessive9bgas9bpilot9b6-water9bin9bthe9boil
What9bis9bthe9bgrade9bof9blight9bdomestic9bfuel9boil9b?9b-9bANSWERS--
Grade9b19b(9bNumber9b19b)
How9boften9bshould9byou9btest9bthe9boperating9bcontrol?9b-9bANSWERS--Annually
How9boften9bshould9bthe9btesting9band9binspecting9bof9bthe9bburner9bcomponent?9b-
9bANSWERS--Annually
QUESTIONS AND ANSWERS
How9bmuch9bclearance9bfrom9bthe9btop9bof9bthe9bboiler9bis9bneeded9bfor9ba9bHP9bboiler9btha
t9bproduces9b700009blbs9bof9bsteam?9b-9bANSWERS--79bfeet
On9ba9bgas9bfired9bboiler9bwhat9bis9bthe9bproper9bgas9bto9bair9bmixture9b-9bANSWERS--
30%-70%9band
in9bspecial9barrangements9bit9bcan9bbe9bas9bhigh9bas9b100%9b.9bANSWER9bCHAPTER9b
9b
119bremember%
What9bis9bthe9btotal9bhardness9bin9ba9bsystem9bthat9bwas9bfound9bto9bhave9bcalcium9bhard
ness9bof9b60ppm9band9bmagnesium9bhardness9bof9b18ppm9band9bcarbon9bhardness9bof9b
129bppm?9b-9bANSWERS--TH=(Ca9bx9b2.5)9b+9b(Mg9bx9b4.1)\
nTH=(609bx9b2.5)9b+9b(189bx9b4.1)\nTH=9b150+73.89b=(9b223.89bPPM)
How9boften9bshould9ba9bcomplete9bexternal9binspection9bof9bthe9bboiler9bbe9bdone?9b-
9bANSWERS--Once9ba9bShift
With9b249bhr9boperation9bhow9boften9bdo9byou9bcheck9bthe9bwater9blevel?9b-9bANSWERS--
Once9bper9bshift
How9boften9bdo9byou9bcheck9bthe9bLWCO?9b-9bANSWERS--Once9bper9bshift
How9boften9bdo9byou9bcheck9bthe9bHigh9bLimit9bSwitch?9b-9bANSWERS--Annually
A9b2"9bpipe9bwas9bfound9bto9bbe9bdelivering9bwater9bat9b1009bpsia9bat9b1040ft9bper9bsecond
.9bHow9bmany9bgallons9bper9bhour9bwill9bit9bdeliver?9b-9bANSWERS--
GPM=9bV9b(diameter9bsquared)9bdivided9bby9b.40859bANSWER9bpg9b4699bBOG
What9bcontrols9bthe9bamount9bof9bblowback9bon9ba9bsafety9bvalve?9b-9bANSWERS--
Blowback9bring9bor9badjusting9bring
On9ba9bopen9bair9bexpansion9btank9bhot9bwater9bboiler9bsystem;9bhow9bhigh9bshould9bit9bbe
9bmounted?9b-9bANSWERS--(49bFeet9b)9babove9bthe9bhighest9bheating9belement.
What9bis9bthe9bminimum9btop9bclearance9bof9bboilers9bwith9bmanholes?9b-9bANSWERS--
59bfeet
Package9bboilers;9bsteam9bheating9bboilers9band9bhot9bwater9bheating9bboilers9bshall9bhav
e9ba9bminimum9bclearance9bof?9b-9bANSWERS--
29bfeet9bfrom9bceiling.9bCode9bchapter9b109bpage76
Most9bimportant9bsafety9bdevice9bon9ba9bboiler?9b-9bANSWERS--Safety9brelief9bvalve
,What9bdoes9ba9bBlack9bLiquor9bBoiler9bdo?9b-9bANSWERS--
Black9bLiquor9bis9bthe9bby9bproduct9bof9bwood9bpulp9bprocessing9bin9bthe9bpaper9bmaking9b
industry.
What9bdoes9bBlack9bliquor9bboiler9bknown9bfor?9b-9bANSWERS--
Steam9bgeneration9band9brecovery9bof9bsoda9bash
Maximum9bline9bvoltage9bfor9bcontrol9bon9ba9bboiler?9b-9bANSWERS--1509bvolts
Under9bwhat9bcode9bare9bboilers9bdesigned9band9bconstructed?9b-9bANSWERS--ASME-
9bCSD9b1
How9bmany9blow9bwater9bcut9boffs9bare9bneeded9bper9bcode9bfor9ba9bhot9bwater9bsystem9bw
hen9ba9bboiler9bhas9binputs9bgreater9bthan9b400,0009bbtu9bper9bhr9b-9bANSWERS--
19bLWCO9bis9bneeded.
What9bis9bthe9bminimum9band9bmaximum9bsize9bfor9ba9bsafety9bvalve9bper9bcode9bfor9bboil
ers?9b-9bANSWERS--Minimum9b3/4"9band9bMaximum9b49b1/2"
What9bstamp9bis9bput9bon9ba9bboiler9bafter9brepairs?9b-9bANSWERS--"R"
What9bis9bthe9bequalizing9bsystem9bused9bfor?9b-9bANSWERS--
The9bequalizing9bsystem9bis9bfor9bwarming9bup9bthe9bsteam9blead.
A9bblowdown9bvalve9bis9blocated9bat9bthe9blowest9bwater9bspace9bof9ba9bboiler9bfor9bthree9b
purposes9b-9bANSWERS--1.9bto9bremove9bprecipitated9bsludge9bor9bloose9bscale9b\
n2.9bTo9bpermit9brapid9blowering9bof9bthe9bboiler9bwater9bif9bit9bhas9bbecome9btoo9bhigh9bac
cidentally9b\
n3.9bAs9ba9bmeans9bof9bremoving9bwater9bfrom9bthe9bboiler9bso9bthat9bfresh9bwater9bmay9bb
e9badded9bto9bkeep9bthe9bconcentration9bof9bsolids9bbelow9bthe9bpoint9bwhere9bdifficulties9
bmay9bbe9bexperienced.
In9bthe9bold9bpower9bboiler9bwhich9btype9bof9bfeed-water9bregulators9bwere9bnot9bused?9b-
9bANSWERS--Electronic
After9bopening9ba9bboiler9bfor9brepairs9bhow9bmuch9boxygen9bis9bneeded?9b-
9bANSWERS--19%
What9bis9bthe9bfirst9bthing9byou9bdo9bwhen9bshutting9bdown9ba9bboiler?9b-9bANSWERS--
Turn9boff9b(extinguish9bfire)
What9bis9bthe9blegal9blimit9bof9bacceptable9basbestos9bparticles9b?9b-9bANSWERS--
0.19bfibers9bper9bcubic9bcentimeter
What9bis9bCREEP?9b-9bANSWERS--
Creep9bis9bdefined9bas9bthe9bslow9bdeformation9bof9bmaterial9bwith9btime;9bwith9bthe9bdefor
mation9btaking9bplace9bat9belevated9btemperatures9bwith9bno9bincrease9bin9bstress.
What9bis9bthe9bBTU9bcontent9bof9bAnthracite9bcoal?9b-9bANSWERS--140009bbtu/lb
,What9bsubstance9btransfers9belectrical9bcurrent9bin9ba9bphotocell?9b-9bANSWERS--
Electricity9bwill9bflow9bwhen9bthe9bCADMIUM9bis9bexposed9bto9bsufficient9blight.
What9bdevice9bacts9bas9ba9bcheck9bvalve9bin9bboth9bdirections9band9bkeeps9bpumps9bprim
ed?9b-9bANSWERS--
FOOT9bVALVES9bare9bused9bfor9bpumps9bunder9bsuction9bpressure9bto9bprevent9bbackflo
w9bprimed?9bon9bthe9bsuction9bline.
What9bprotects9bboilers9bfrom9bexplosion9bin9bthe9bfurnace?9b-9bANSWERS--
A9bflame9bguard9bsystem9bis9ban9barrangement9bof9bflame9bdetection9bsystem;9binterlocks
;9band9brelays9bwhich9bwill9bsense9bthe9bpresence9bof9ba9bproper9bflame9bin9ba9bfurnace9ban
d9bcause9bfuel9bto9bbe9bshut9boff9bto9bthe9bfurnace9bif9ba9bhazardous9bcondition9bdevelops9b
(improper9bflame9bor9bcombustion).
What9bsize9bpipe9bis9bused9bas9ba9bheader9bin9ba9bboiler9boperating9bat9b100psi?9b-
9bANSWERS--69binches
What9bdevice9bis9bused9bto9bmeasure9bflue9bgasses9b-9bANSWERS--
The9bOrsat9bAnalyzer
Which9blow9bwater9bcut9boff9bdoes9bnot9bhave9ba9bmercury9bswitch?9b-9bANSWERS--
The9bSubmerged9belectrode9btype
What9bis9bthe9bbtu9boutput9bper9blb9bof9b#49bfuel9boil?9b-9bANSWERS--18
What9bsubstance9bis9bused9bfor9bthe9belectric9btransmission9bin9ban9bRTD?9b-
9bANSWERS--Platinum9bis9bused9bbecause9bof9bits9bstability9bat9bhigh9btemperatures
How9bmuch9bair9bis9bneeded9bfor9bthe9bcombustion9bof9bpulverized9bcoal;9bgas;9boil?9b-
9bANSWERS--50%9bfor9bcoal9band9b10-30%9bfor9bgas9b&9boil
In9bold9bpower9bboilers9bwhich9btype9bof9bfeedwater9bregulators9bwere9bnot9bused?9b\
n(A)9bhydraulic9b\n(B)9bfloat9b\n(C)9bthermostatic9bexpansion9b\n(D)9belectronic9b-
9bANSWERS--ANSWER9bD9belectronic/electro-magnetic
What9bis9bhard9bforming9bscale?9b-9bANSWERS--Silica
With9bhydroxide9bpresent9band9bnormal9boxygen9blevels9bwhich9bchemical9bwill9bcause9bp
roblems?9b-9bANSWERS--Chlorine
The9bresult9bfrom9bsteel9bmanufacturing9band9bunder9bpressure9bin9bboilers9btends9bto9bca
use9bbuldging?9bA9bbuldge9bis9bcaused9bby9b?9b-9bANSWERS--
A9bbuldge9bis9bcaused9bby9boverheating9bof9bthe9bshell9bplates9band9bit9baffects9bthe9bentir
e9bthickness9bof9bthe9bplate.
A9bblister9bis9bcaused9bby9bwhat9b?9b-9bANSWERS--
Slag9binclusion9bforming9ba9blamination9bat9bthe9btime9bthe9bplate9bwas9brolled9bat9bthe9bste
el9bmill.9bA9bblister9bis9ba9bseparation9bof9bthe9bmetal9bfrom9bthe9bshell9bplate9bcaused9bby9bi
mpurities9brolled9binto9bthe9bshell9bplate9bwhen9bformed.
, With9bnormal9boxygen9band9blow9balkalinity.9bwhat9bis9badded9bto9bthe9bboiler9bwater?9b-
9bANSWERS--Neutralizing9bAmines
Which9bchemical9bis9bused9bto9bcombat9bscale?9b-9bANSWERS--
Combined9bphosphate9btreatment-9bsodium9bphosphate
Other9bthan9bsulfite9bwhat9bchemical9bis9bused9bto9bcombat9bcorrosion9bin9bboilers?9b-
9bANSWERS--Hydrazine
What9bwill9bneutralize9bacid?9b-9bANSWERS--Alkali9band9bLime9bSoda
What9bmechanical9bdevice9bis9bused9bto9bremove9bscale9bfrom9bfiretubes?9b-
9bANSWERS--A9btube9brattler9bor9bvibrator
What9bpercentage9bof9bthe9bpressure9bshould9ba9bboiler9bhave9bbefore9byou9btest9bthe9blev
er9bof9ba9bsafety9bvalve?9b-9bANSWERS--75%
Where9bis9binternal9bcorrosion9bmost9blikely9bto9boccur9bon9ba9bvertical9btube9bboiler?9b-
9bANSWERS--Water9bleg-Mud9bleg
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Nitrogen
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9bANSWERS--
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Grade9b19b(9bNumber9b19b)
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9bANSWERS--Annually
