General information

Local regulations may restrict the use of this product to below the conditions quoted.

Product limitations

In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2016

A

B

C

11.4.11

D

TI-S13-50

CH Issue 3

Pressure / Temperature Limits

for Safety Valves

Safety valve Technical Information sheets (TIs) contain a 'Pressure / temperature limits' diagram. This diagram indicates the envelope

of the product(s) at the full range of pressures and temperatures. Note: The construction of this diagram and a typical example (no

specific product) is displayed below:

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Note: This line will illustrate the

minimum operating temperature not

the minimum design temperature.

Pressure bar g

A

Is the maximum design temperature the body of the product

can be raised to permanently, at a given pressure.

B

Is the maximum design pressure that the combined body

and end connections of the product can withstand at a

given temperature. It is a function of the PN rating and body

design / material.

C

Is a prohibited area and the product must not be used in this

region and will be worded:

The product must not be used in this region.

D

The steam saturation curve is added (where relevant) to

enable users to easily find the specific operating points,

e.g. 10 bar g saturated steam @ 185 °C, 10 bar g steam

with 20 °C superheat or 10 bar g / 250 °C steam.

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Pressure bar g

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