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WARNING—Misuse of this product may cause explosion and personal injury, Do not use without first reading and
<br /> understanding these instructions and the apparatus installation and operating instructions.
<br /> U-S GAUGE
<br /> UWETEK HUNTERS RINGiON PIRODUCTS {
<br /> f
<br /> SELLERSVILLE, PENNSYLVANIA 18960
<br /> USE AND INSTALLATION OF PRESSURE GAUGES
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<br /> The following information on installation and use has been excerpted from ANSI B40.1-1985. The complete ANSI
<br /> B40.1-1985 standard which contains additional information may be obtained from the AMERICAN SOCIETY OF
<br /> MECHANICAL ENGINEERS,22 Law Drive, Box 2300, Fairfield,NJ 07007-2300
<br /> 3.3.4P. ureConnection contamination or where lower pressure may have a corrosive effect on the elm511C 4.3.6.2 Cases, Liquid Filled. Ithas been
<br /> 3.3.4.1 Lantloer of Connection gauges could be installed in higher prey- dtmenf- gg trot nracticc to use glycerine ur silicone
<br /> sure systems 4.2-7-4 Ex losire Failure. Explosive fail- fillip liquids However, [hese fluids may
<br /> (a) stem mounted—bur om or back P P
<br /> (J) s stems containing radioactive or toxic urn is caused h the release of ex nsive not rte suitable for all applications. They
<br /> Fail-
<br /> 4
<br /> surface mounted—bonom or back Y PI '
<br /> wds pfquids or uses) energy generated by a chemical reaction should be avoided where strong oxidizing
<br /> {c1 flush mounted—bac£ BY 8
<br /> (Fl systems in ed in a hoz ardour such as can result when adiabatic crimpers- agents including,but not limited to,oxygen, ! ,
<br /> 3.3.4.2 n'Pe of Connection. Faper pi environment cion of oxygen occurs in the presence of chlorine,nitric acrd-and hydrogen peroxide
<br /> cunaections for pressures up diruuggh 20.0, 4,2,5 When gauges are to be used in contali hydrocarbons. It is generail accepted that arc involved. In the presence of—dtnng a
<br /> psi(l60 000 kPa)are usually lis-27,4r-I8, with media having known or uncertain corm- there is no known means oY predicting the agents, potential hazard can result from /
<br /> or I/2-14 American Standard external or in, sive effects or known to be radioactive,ran- magnitude or effects of thu qpe of failure, c emicat reaction. ignition. or exglonon. ;
<br /> ternal taper pipe threads (NPT) per ANSI dom or unique destructive phenomena can Fnr this mode of failure. a sold wall or Completely fluorinated or chlorinated fluids.
<br /> 82.1.a;required. Above this pressure. 1/4' occur.In such cases the user should always parcifian between the elastic clement and the or both,may bin more suitable for such apph-
<br /> high pressure Tubing connections,or equal, fumish the supplier or manufacturer with in- window will not necessarily prevent parts cations. I :
<br /> may he used.Other appum
<br /> rimely sited con- formation relative m the application and so- being projected forward. The user shall furnish deviled information
<br /> nections. cmyloying scaling means other licit his advice prior to installation of the 4.2.8 Pressure Connection.Ser rccommen- relative To the application of gauges having
<br /> than Tapered threads.are acceptable. au e. liquid filled cases and solicit the advice of .
<br /> In ailylicauons of stem rhoun[ed augcs. B B dations in para-3-3A the gauge supplier prior in installation.
<br /> esppecccially with liquid fiilydlcases and where 4.2.6 Fire and explosions within a pressure 4.3 Safety Recommendations Consideration should aiw be given to the
<br /> vib.,,on
<br /> is severe,consideration should be system can cause pressure cicmew failure 43.1 Operating Pressure. The pressure instantaneous hydraulic effect that may be
<br /> given to the possibility of failure of the stem with very violent effects.even to the point of gauge selected should havr a full scaic pros- created by one of the modes of failure out-
<br /> or associated piping caused by the vibrating completely disimc ratingg or melting the .urs such that[he o eateng pressure occurs lined in para.4-2.7-The hydraulic effect due
<br /> mass of the gauge,A large connection(e.g-, pressure gau e.Violent cFfeels arc also pm- in the middle half!'PS to 75 k I of the scale. to pressure element failure could cause the
<br /> 1!t NPC instead of ba NPTI dr a stronger term duced when failure occurs due m, The full scale pressure of the gauge selected window to be projected forward even when a
<br /> material (e. .. stainless siccl instead of (a) hydrogen embnuicrncnt should be appruximately two times the in- case having a sold Iront is employed.
<br /> brass),or both,should be considered. fb)contamination of a compressed gas tended o rating pressure. 4.3.7 Restricior. Placing a resuictor be-
<br /> .F fri formation of aceayhdes Should it he necessary for the upertiona tween the pressure connection mid the elastic
<br /> 3.4,1.10 Mounting a pressure gauge c a (d) weakening of soft solder joints by sTcam pressure to exceed 751k of full scale.contact element wiillI not reduce the immediate effect
<br /> E _ - ppoosition other than that u acy.whiit was tali- or other heat sources the supplier for recommendation%. of failure.but will help controt now of es.
<br /> bratcd can affect its accuracy.Normal cab- fet weakening of salt soldered or silver This does not apply w(est.retarded.or caping fluid following rup ture and reduce the
<br /> beating position is upright and vertical. For brazed 1otnis caused by heat suurcc+ Suppressed scale gauges. potential of secondary effects.
<br /> AP plications requiring mounting in odrcr than such as fires 4,},2 Use of Gauges Near Zero Pressure. q.3.8 Specific Service Conditions
<br /> i this position,notify[e supplier. g 1�.
<br /> fJl corrosion The use of gauges near zero pmssum is nor 4.3.8.1 Specifi[ applications rtu pressure
<br /> 3.4.1.12 Caution to Users. !g41 fou@@tie recommended because the accuracy Toler- gauges exist where hazards are known. In
<br /> Pressiur gauges can be tendered inaccurate ff+) mechanical shock y percentage p y quire g
<br /> B g ante may be a Ise a rima a oT the a man mxist wh requirements for design.
<br /> during shipment despite cam taken in pack- fit excessive vibration lied pressure.If, or example.a 0.100 psi construction, and use of gauges for these
<br /> aging. To ensure despite
<br /> cam,conformance to the sack- Failure m a compressed gas system can be rade B gauge is used[o measure 6 psi.the applications are specified by state w federal
<br /> lord grade to which the pressure au a was expected to produce violent effects, _ -
<br /> g P 8 g accuracy of measurement will be Vst,or agencies or Underwntcrs Laboratories,Inc.
<br /> manuFac[ured. it should be checked before 4.1.7 Modest of Elastic Element Failure. –50th of the applied pressure In addition Some of these specific service gauges .+r
<br /> use- There.re tour basic must.,.,F riaaic ricuicm rhe scale of a gauge is often laid out with imea wow."rite iso is nor intended To in.
<br /> 4 SAFETY failure.as follows. takeup,which can result in further inaccura. elude all types,and the user should always
<br /> 4.1 4.2.7.1 Fatigue Failure. Fatigue failure tics when measuring pressures that air a advise the supplier of all application detaili.
<br /> This coon of[he Standard resents cer- caused b rrssurc induced stress enerall small percentage of the gauge span. 4.3.8.2 Acetylene Gauge. A
<br /> p ) p g 7 y g gauge Be-
<br /> vin inforrnatmn to guide user, suppliers, occurs from the inside to The outside clung a For the same reasons,gauges should rail! signed to indicate acetylene pressure. t shall
<br /> and manufacturers toward Immunizingthe hr hl stressed edge radius,a ren as a be used for the purpose of indicating that the be constructed usin mueriass that are cum!
<br /> B Y B 9! K &
<br /> hazards that could result from misuse or mit- small crack that propagates along the edge precsum in a tank,autoclave.or other similar ppatiblc with Commercially available acefy.
<br /> applin[ion of pressure auger with clastic radius.Such fatluhis arc usually marc critical unit has been<ompI tcI cvhamted to atmn- line. The gauge may bear the inscription t
<br /> elements.The user should become(amiGar with compressed gas media than with liquid spline pressure.Depending on the accurac} ACETYLENE on the dial,
<br /> with all sections of this Stafidard,as all as. media. and the span of the gauge and the psi,sibilty 4.3.8.3 Ammonia Gauge. A gauge de-
<br /> pccts of safety cannot be'covered in this Fatigue cracks usually release the media that takcup is incorporated at the hcem ing s[gncd to indicate ammonia pmwre and to
<br /> Section.Consult the manufacturer or supple- fluid slowly so case pm%sum buildup can br _ of the scale.hazardous pressure may remain withstand the corrosive effects of ammonia.
<br /> er for advice whenever there is uncertainty awned by providing pressure relief openings in the tank even though the gauge is indicat- Thc auge may bcu the inscription Abl-
<br /> about die safe application of a rcssure in the gauge case. uwevcr.in high ressurc in
<br /> zero prcssurc.A venting device must be
<br /> PP P B B P MO Aon the dial.It may also include the
<br /> gauge. elastic elements where the yield strepggih ap sed as compgglpely reduce the pressure br- equivalent saturation umptrature scale
<br /> 4.2 Genera!Discussion •i pmaches the ultimate strength of the elrmena f„performing
<br /> �s miler activirieshtlmgii.or markings on the dial
<br /> 4.2fatigue failure may reeemhle explo. Pe B 4J.BA Chemical Gauge.A gauge dist Ted
<br /> 4.1.1 Adequate safety results from intdli- sive fadurc. 4.3.3 Com atibifit With the Pressure B B
<br /> int planning and careful selection and in p Y vi indicate the pressure of he primary
<br /> or high
<br />�. s P. B et will a du placed in the gauge pressurt thin%lew ll The clastic element o es necessity
<br /> a nalfs)it fluids,or both.The rim mate-
<br /> stallauon of gauges emu a pressure system. inlet will reduce pressure surges and restrict ) p �
<br /> p B thio walled member,which of necessity op- malls)m contact with the pressure medium
<br /> The user should m(orsn the sitpplicr of all fluid now into the aniall o n Bourdon P
<br /> conditions pertinent to [he�a licatian and P Y'P< erases under high stress conditions and mus[. may be iwith a c on the dual. It may be
<br /> P< PP tube therefore.be carr(ully sdecTrd for cnmpati- ui d with a chemical fdia lira m1 seal.
<br /> mend the
<br /> m so that the supplier can recom- eq' PPe P .
<br /> mend the coria suivbkc gauge for the apple- 4.2.7.2 Overpressure Failure. Dverprcs- bihty with the pressure medium bring mea- pulsation damper,w pressurc mile. device.
<br /> cation. sure Cailure is caused by the applicm ion of Sundt None of rhe common element miller- or a combination- These devices he to
<br /> internal pressure greater than the rated limits its is impervious to every type of chemical minimize potential damage to personnrFand
<br /> 4.1.2 Thc history of safety with respect to of the clastic element and can occur when a attack.The potential fur corrosive attack is property in the evem of gauge failure.The,
<br /> the use of pressure gauges has been excel- low pressure gauge is installed in a high established by many factors. including the may,however,also reduce accuracy or sensi.
<br /> Ism.]n=ary to personnel and damage to prop- pressure port or system. The effects of concenrradon.temperature,and contamina. rivey.or both.
<br /> eny have been minimal.In'mos:instances, overpressure failure,usually more critical In tion of the medium.The user should inform 4.3.$,$Oxygen Gauge.A gauge designed
<br /> the cause of failure has been misuse or compressed gas systems than in liquid filled Ute gauge supplier of the insvilation condi- to indicate oxygen pressure. Cleanliness
<br /> misapplication. systems. arc usepredictable and may cause tions so[hat ,lie,
<br /> element mater- hall earn ply a ed:twit,v tree Section 5 r.
<br /> 4.2.3 The prcssurc sensfn element in most parts to be propelled in any direction,Cases cls can be selected The dial shall be clearly marked with a une-
<br /> gauges is subjected to high$internal stresses, with Pressor relief openings will not always 4.3.4 In addition to the factors dfseusscd versal symbol snd;or USE NO OIL in red
<br /> i and appficauons exist where the possibility retain expelled parts, above,flit capability of a pressure element is color(see para.6-1-2.1).
<br /> of catastmptaic failure -s present. pressure Plating a resinctor in the pressureauge influenced by the design,materials.and fab- 4.4 Reuse of Pressure Gauges
<br /> regulators.chemical fdia htagm)seals,put- fillet will not reduce the immadvre effect of rication of the joints between its pans It is not mcummendtd that pressure
<br /> ration dam rs ar situ pp rs, s harts. and failure,but will help control flow of cscap- Common methods of joining err wet sol-
<br /> pe bbe yp 1 K gauges be moved from one application to
<br /> other similar items.art available for use in ing fluid following rupture and reduce paten- Bering,silver brazing, and welding. Joints naher.Should it be necessary,however,the
<br /> these potentially hazardous systems. The tial of secondary effects. can be affected by temperatures.stress,and following must be considered
<br /> Itpotential increases a['hi cropernmg 1t is generally accepted that solid from corrosive media. Where application quos- 4.4.1 Chemical Compatibility.The conse-
<br /> haaardpmssuc . cases with pressurc relief back will reduce lions arise,these factors should be consid- quenees of incompatibility can range Imm
<br /> the poxsibiliev of pans being projected for- ered and discussed by the user and manufac- contamination to explosive failure. For u- f
<br /> 4-2.4 The following systems are considered ward in the event of failure, turn. - ample,moving an oil service gauge to oxy-
<br /> evalua ally hazardous and must be carefully The window alone will not provide ode- 4.315 Some special applications require that gen service can result in explosive failure-
<br /> evaluared: �quate protection a,gamst internal rax prcs-
<br /> (a)coni mssed as systems the pressure Ntre int assembly have li high 4.4.2 parted Fatigue.The fim installation
<br /> P 8 sure buildup.and can b<the most hazardous 8t1
<br /> f61 oxygen systems component. degree o leakage deg [v Special arrange- may involve presser pulsation that has es-
<br /> mmt should be made bel aeon manable lecturer tided most of the o r nsta anon.ng m
<br /> !c) systems containing hydrogen or fret hy- q,2.7,}Corrossan Failure.Corrosion fail- gauge
<br /> deo en atoms � and user[o assure ilia[ilii allowable leakage early fatigue m the second installation.
<br /> ore occurs when the clastic clement has been rate is not exceeded
<br /> corrosive Hued systems(gas and liquid) weakened through attack by corrosive _ 4.4.3 Corrosion.Corrosion of the pressure
<br /> I rJ pressum systems containing any cxpio• chemicals present in either the media inside 4.3.6 Cases + element assembly in the first installation may
<br /> sive oc flammable mixture or medium 4.3.6.1 Cases,Solid Front.It is generally be sufficient to cause early failure in the
<br /> or the envimnmem outside ft. Failure may
<br /> (� ucam svucros occur as pinhole leakage through rhe element 33. will
<br /> that a Solid irony case per para- second installation.
<br /> !ggf nonsteady pressure systems walls or early fate fatigue failure due to stress 3-3.1 will reduce 7Mc possibility of pans be- 4.4.4 Other Cons:deretans.When reusing
<br /> !hl systems where high overpressure could br'o ing projected Forward in the everts of dasuc a au e,all guidelines covered in Nis Stan-
<br /> be about accidentally applied; �` elemem usembly failure. An exception is dard relative to a licauon of gauges should
<br /> ration or mica) ;e aphr n the material. - �P B B
<br /> fi) systems whemin mtcrchan cabil ity of A chemical idiaphragml stat should be explosive Failure of ilii dasaec element �followed in t e same manner as when a t
<br /> gauges could resvl[in hazandous internal considered for use with pressure media drat assembly. new gauge is selected- .I
<br /> IMPORTANT—Read other side for additional instructions and warnings.
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