JID

F7220-1996

Shipbuilding-CastironYtypestrainers

1.ScopeThisJapaneseIndustrialStandardspecifiescastironYtypesystemstrainers(hereinafterreferedtoas"Ytypesystemstrainer",usedforreducingvalves,draintraps,andinletsideofsteambleedingejectorsetc.,intheships'machineryspace.

Remark:Thisstandardmakesreferencetothefollowingstandards:

JISB0207-Metricfinescrewthreads

JISB2210-Basicdimensionsofferrousmaterialspipeflanges

JISF7102-Shipbuilding-Pipingsysteminmachineryspace-Applicationforgasketsandpackings

JISF7200-Shipbuilding-Generalrulesforinspectionofstrainers

JISG3101-Rolledsteelforgeneralstructure

JISG4304-Hotrolledstainlesssteelplates,sheetsandstrip

JISG4309-Stainlesssteelwire

JISG5501-Grayironcastings

JISH3250-Copperandcopperalloyrodsandbars

2.ClassificationTheYtypestrainersshallbeclassifiedasgiveninTable1accordingtothenominalpressureandnominaldiameter.

Table1

Nominalpressure

Nominaldia.

5K

20,25,32,40,50

10K

3.PressureratingTherelationbetweenfluidconditionandmaximumworkingpressureshallbeasgiveninTable2.

Table2

Fluidcondition

Max.workingpressureMPa

5K

10K

Steanof220℃orless

0.5

1.0

Airandgas

Nonshockwaterof120°Corless

0.7

1.4

4.Construction,shapeanddimensionsTheconstruction,shapeanddimensionsshallbeasshowninFig1.Thepermissibledeviationofbodythickness"a"shall,asarule,bewithin±18%,butwhenthecalculatedvalueisbelowImm,permissibledeviationmaybeImm.

5.MaterialsThematerialsshallbeasfollows:

(1)Thebody,bonnetandstrainerwiregauzeshallbeasshowninFig.2

(2)Thematerialsusedforotherpartsshall,asarule,beasshowninFig.2.

F7220-1996

6.TestsandinspectionTheYtypestrainersshallbesubjectedtothefollowingitemsofinspectioninaccordancewithJISF7200.

(1)Materialinspection

(2)Visualinspection

(3)Dimensionalinspection

(4)Assemblyinspection

(5)Hydraulicinspection

ThehydraulicinspectionshallbecarriedoutattestpressuresgiveninTable3.

Table3

Nominalpressure

TestpressureMPa

5K

1.05

10K

2.1

7.DesignationTheYtypestrainersshallbedesignatedbythetitle,JISnumber,andnominalofdiameterorsymbol.

Example:Forastrainerofnominaldiameter20

5

CastIron5K-20YTypeSteamStrainerformarineuse

orFYS

020orJISF7220-5K20

—nominal—nominal

diameterpressure

——castironYtypesteamstrainerformarineuse

8.MarkingThefollowingparticularsshallbemarkedonthebody.

(1)NominalpressureandnominaldiameterExample:5K-20

(2)Arrowheadindicatingthedirectionofflow

(3)Manufacturer'snameormark

(4)Yearandmonthofmanufactureortheabbreviated.

F7220-1996

Boltholesofflangeshallstraddlebodycentrelines.

Unit:mm

Nominaldia.

d

L

D?

a

L?

t

Flange

Bonnet

Strainercylinder

(.xordda)H

Refer-ence

D

Bolthole

Nomina

dia,ofbolt

A

C

Threads

d?

Bolt

hole

Nominat

dia.ofbolt

d?

Calcu-latedmass

(kg)

No.

五

20

20

200

55

6

115

18

85

65

4

12

M10

14

80

75

M24×2

4

5

M12

30

80

128

4.19

25

25

225

70

7

140

20

95

75

4

I2

M10

14

100

90

M24×2

4

19

M16

40

95

153

6.55

32

32

260

80

8

150

20

115

90

4

15

M12

16

105

100

M24X2

4

19

M16

50|

105

164

8.56

40

40

280

95

9

170

20

120

95

4

15

M12

16

110

105

M24×2

4

19

M16

60

120

180

10.8

50

50

320

110

9

205

20

130

105

4

15

M12

16

155

120

M24×2

4/

19

M16

70

150

208

15.2

Remarks:1.Theflangesintheuppercolumnshallconformtotherequirementsofnominal5Kof

JISB2210,andthelowercolumntonominal10KofJISB2210.

2.Thethreadd?shallconformtoJISB0207.

3.Theholediameterofstrainercylindersandgauzemeshshallbeasdesignatedbythepurchaser.

4.Dependingonservices,eitherthestrainerwiregauzeorstrainercylindermaybeusedalone.

Fig.1Construction,shapeanddimensions

F7220-1996

No.

Component

Material

1

Body

JISG5501-FC200

2

Bonnet

3

Strainercylinder

JISG4304-SUS304

4

Strainerwiregauze

JISG4309-SUS304-W1

5

Stud

JISG3101-SS400

6