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Regulation 67. Pipes and pipe fittings for steam or feed water.



                                    P.U.(A) 5/70
FACTORIES AND MACHINERY (STEAM BOILER AND     
                   UNFIRED PRESSURE VESSEL)
                           REGULATIONS, 1970
         PART IV - MISCELLANEOUS PROVISIONS

Regulation 67. Pipes and pipe fittings for steam or feed water.

(1) Every ferrous and non-ferrous pipe, bend, elbow, tee and special for use under steam or feed
water pressure shall comply in respect of material, mode of manufacture, dimensions, hydrostatic
and other tests, method of securing and type of flange and maximum safe working pressure with
the appropriate provisions of British Standard Specification No. 806-Ferrous pipes and piping
installations-or No. 1306- Non-ferrous pipes and piping installations.

(2) The limits within which any such pipe, bend, elbow, tee and special are to be used shall be in
accordance with the table following:








                                   TABLE
            MAXIMUM DESIGN PRESSURES AND           
                         TEMPERATURES


Material
and form       
 Method of  manufacture
          
Maximum design                                                 pressure in pounds
     per square
inch                                            
Maximum  
design
temperature
in degrees
Fahrenheit



Remarks

Carbon Steel
 Cold drawn

seamless
Hot finished
seamless
Hydraulic
lapwelded
No restriction …………..
…………..

900
900
900

Class A
Class B
Class C

Carbon Steel
Hot finished
seamless
Roll lapwelded
Buttwelded
300 .. .. ..
300 .. .. ..
300 .. .. ..

500
500
500

Class D
Class E
Class F

Carbon Steel
.. Cast
.. No restriction
.... 900


Cast iron
.. .. Cast ..
.. Blow down 150
Steam 150
Feed 200 ..
400

400
400
elbow, tee or
special
only
Bronze or
gunmetal

Cast .. ..
Steam 250
Feed 350 ..
405
 300

elbow, tee or
special
only

Copper
Solid drawn
Up to and
including
5 inches diameter
for
steam 250
Above 5 inches up  
to and including 8
inches diameter for
steam 175

Up to and
including 8 inches
diameter for  
feed 300


405





405










300

Straights and
bends


NOTE-Class of manufacture A to F means class of manufacture as set out tin British Standard
specification No. 806-Ferrous pipes and piping installations.

(3) A screwed and socketed joint may be used for any steam pipe, bend or fitting if such pipe,
bend or fitting is made of steel or wrought iron for service at a temperature not greater than five
hundred degrees Fahrenheit and at a pressure within the following limits:

Nominal bore in inches                               

Maximum design
pressure in pounds
per square inch
1" diameter and under ...
175       
1 1/2" ,,
150
3" ,,
125
4" ,,
100


(4) Every copper pipe and bend for steam or feed water service shall be carefully annealed
before fitting and thereafter at intervals of not more than four years of working life.

(5) Piping for service with an unfired pressure vessel not under steam pressure shall comply
generally with the provisions of this regulation in respect of piping under steam pressure:

Provided that an Inspector may, in his discretion, and in consideration of the service conditions,
allow the limits of pressure, temperature, type of joint and size prescribed in this regulation to be
exceeded by an amount not greater than fifty per centum thereof.



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