Marston Technical Catalogue - Safety Systems UK Ltd

FLANGE SEALING
Bursting disc holders can usually be provided
to satisfy the requirements of any type of
flange sealing arrangement. The diagrams
below illustrate typical examples. Flange joints
(i.e. those between the holder and the mating
flanges) will normally be provided by the
customer. Marston will supply gaskets for
bursting discs that are designed to be fitted
directly between flanges, such as the
Monobloc graphite disc.
Flat gasket joint
‘O’ ring joint for
minimum leakage
Ring type joint for high
pressure/temperature
Tongue and groove
TABLE OF FACE TO FACE DIMENSIONS
Bore Size
TYPE 25 40 50 65 80 100 150 200 250 300 350 400 450 500 600
Std 21 21 21 25 25 30 41 50 60 - - - - - -
CST 1/4” NPT 30 30 30 30 30 30 41 50 60 - - - - - -
1/2” NPT 38 38 38 38 38 38 42 50 60 - - - - - -
Conn Head 42 42 42 42 42 42 46 50 60 - - - - - -
Std 21 22 25 30 33 43 59 72 - - - - - - -
NT 1/4” NPT 30 30 30 30 33 43 59 72 - - - - - - -
1/2” NPT 38 38 38 38 38 43 59 72 - - - - - - -
Conn Head 42 42 42 42 42 43 59 72 - - - - - - -
Std 38 38 38 38 38 38 47 56 68 78 84 94 102 108 127
CSB 1/4” NPT 46 46 46 46 46 46 46 56 68 78 84 94 102 108 127
CSB-T 1/2” NPT 54 54 54 54 54 54 54 56 68 78 84 94 102 108 127
Conn Head 58 58 58 58 58 58 58 58 68 78 84 94 102 108 127
Std 26 27 28 30 30 32 43 55 70 85 100 110 125 135 -
RBH 1/4” NPT 36 37 38 40 40 42 51 63 78 93 110 120 130 140 -
RBH-T 1/2” NPT 48 49 50 52 52 54 63 75 90 105 118 128 138 148 -
Conn Head 52 53 54 56 56 58 67 79 94 109 122 132 142 152 -
Std 72 72 57 62 64 85 116 148 169 198 223 255 277 296 344
MV-A 1/4” NPT 72 72 57 62 64 85 116 148 169 198 223 255 277 296 344
1/2” NPT 72 72 57 62 64 85 116 148 169 198 223 255 277 296 344
Conn Head 72 72 57 62 64 85 116 148 169 198 223 255 277 296 344
Std 17 19 21 24 28 33 37 41 47 - - - - - -
GR 1/4” NPT 33 35 37 39 42 45 48 52 57 - - - - - -
1/2” NPT 41 43 45 47 50 53 56 60 65 - - - - - -
Conn Head 45 47 49 51 54 57 60 64 69 - - - - - -
Std 17 - 20 - 30 35 52 - - - - - - - -
GRB 1/4” NPT 31 - 32 - 36 41 52 - - - - - - - -
1/2” NPT 39 - 40 - 44 49 60 - - - - - - - -
Conn Head 43 - 44 - 48 53 64 - - - - - - - -
Monobloc Std 14 17 21 22 22 25 29 35 38 - - - - - -
17
Other sizes / options may be available. Please consult Marston.