DESIGN MANUAL

Preparation of Datasheet

for Breather ValveSEM 9487E

REV. : 0

DATE : 2006. 8. 23PAGE 2 OF i

CONTENTS

Page11GENERAL

12INFORMATION

12.1Tag Number

12.2Quantity

12.3Service

12.4Breathing

22.5Line Class

22.6Fluid Name

22.7Max. Operating Pressure

22.8Operating Temperature

32.9Relieving Rate (Normal)

32.10Relieving Rate (Emergency)

32.11Set Pressure

42.12Back Pressure (Constant)

42.13 Back Pressure (from - to)

42.14Overpressure %

42.15 Breathing Temperature

42.16 Specific Gravity

42.17Viscosity, cP

52.18Molecular Weight

52.19 Cp/Cv

52.20 Z, Compressibility Factor

52.21 Equipment Design Pressure mmH2O

52.22MAWP mmH2O

62.23Flame arrester

62.24P&ID NO.

62.25Remark

63REVISION HISTORY

1GENERALTo prepare a breather valve (so-called pressure vacuum relief valve) data sheet, project specification should be applied preferentially, if it is required. After that this guide is utilized to fill-up a adequate data at each item. If the design pressure of storage tank is smaller than 1.0 kg/cm2G (15 psig), this guide can be applied. If not, data sheet should be prepared based on the preparation guide for safety valve data sheet. For the details of technical matter, refer to the following code & standard.

- API std. 2000

2INFORMATION2.1Tag Number

Tag number is a identification number of breather valve and specified as PSVSV-000 regardless of its type.

2.2QuantityQuantity is specified using the Arabic numerals and sometimes an English letter and bracket may be used for quantity, if required.

2.3Service

The number of equipment or location, at which breather valve is installed, is specified. Examples are shown as followings.

ex) V-1111, T-2222 OVHD etc2.4Breathing

This is composed of "In breathing" and "Out breathing" to specify each process data independently.

2.5Line Class

This indicates the line class or line spec. of breather valve inlet and outlet after confirming P&ID. This item should be described because it is helpful to confirm the material of PVSV. If the line class is not represented on P&ID, base material may be described as followings.

ex) Carbon steel : C.S

Stainless steel: S.S or 304 S.S, 316 S.S, monel etc.

2.6Fluid Name

This is composed of "In" and "Out" to specify each fluid name independently.

If the fluid is toxic, it is specified as "toxic service" at Remark

2.7Max. Operating PressureThe design pressure of equipment, at which breather valve is installed, is specified for max. operating pressure. This is composed of "In" for negative pressure and "Out" for positive pressure.

ex)In : -50 mmH2O

Out: +150 mmH2O

2.8Operating Temperature

This is composed of "In" and "Out". The normal operating temperature of equipment or line, at which breather valve installed, is specified at "Out" and the operating temperature of inbreathing fluid is specified at "In".

2.9Relieving Rate (Normal)

This indicates the required flow rate based on the calculation of API std. 2000.

Required flow rate means the in/out breathing rate by the empting/filling of process fluid. Sm3/hr (API std. 2000) or m3/hr are used as the unit of relieving rate. When the relieving rate is represented using Sm3/hr, the unit basis (15oC, 1atm, Air) should be specified at Remark.

2.10Relieving Rate (Emergency)

This is not specified usually. But when the emergency vent facility (emergency hatch) is installed, another item no. is used and relieving rate (emergency) is specified. Emergency hatch is installed because the venting rate for the fire exposure of storage tank is larger than the normal relieving rate generally. At this time, the venting rate is calculated using API std. 2000.

Sm3/hr (API std. 2000) or m3/hr are used as the unit of relieving rate. When the relieving rate is represented using Sm3/hr, the unit basis (15oC, 1atm, Air) should be specified at Remark.2.11Set Pressure

At set pressure, breather valve will start to operate. Usually the operating pressure range of equipment, at which breather valve is installed, is utilized as set pressure. When the breather valve and emergency hatch are installed simultaneously, equipment design pressure may be used for the set pressure of emergency hatch. The following example shows the sample of set pressures of breather valve and emergency hatch in this case.

ex) When the Set points of Breather valve are In : -25 mmH2O

Out: 100 mmH2O,

The set points of Emergency hatch are in: -50 mmH2O

Out : 150300 mmH2O

2.12Back Pressure (Constant)

This is not specified usually.

2.13 Back Pressure (from - to)

This is not specified usually.

2.14Overpressure %

This indicates the gap between the set pressure and relieving pressure as a percent of set pressure. If the set pressure equals the maximum allowable working pressure, overpressure is equal to accumulation.2.15 Breathing Temperature

This is composed of "In" and "Out". The estimated temperature at breathing condition is specified at "Out", but normally the estimated temperature is equal to process operating temperature. And the operating temperature of inbreathing fluid is specified at "In".2.16 Specific Gravity

This is not specified usually.

2.17Viscosity, cP

This is not specified usually.

2.18Molecular Weight

This is composed of "In" and "Out". For "Out", molecular weight of process fluid at relieving condition or average molecular weight of inert gas and process fluid is specified. And for "In", molecular weight of inbreathing fluid is specified.

2.19 Cp/Cv

This is the ratio of heat capacity. (Cp : heat capacity at constant pressure, Cv : heat capacity at constant volume) Cv can be calculated easily using Cv = Cp - R (R : gas constant) under the assumption that the gas is ideal gas. This is composed of "In" and "Out". For "Out", the value for relieving condition is specified at "Out" and the value for inbreathing fluid is specified at "in".

2.20 Z, Compressibility FactorThe value at relieving condition is specified and if there is no calculated value, 1.0 is specified.

2.21 Equipment Design Pressure mmH2OThis indicates the design pressure of equipment at which breather valve is installed.As this is used only for reference, there is no necessity to specify.

2.22MAWP mmH2OThis means the Maximum Allowable Working Pressure of equipment at which breather valve is installed. Set pressure should be lower than MAWP.

As this is used only for reference, there is no necessity to specify.

2.23Flame arrester

As per the local regulation of Korea, flame arrester should be installed for the fluid of which flash point is lower than 65. However, as per the NFPA CODE (NFPA 30), it should be installed for the fluid of which flash point is lower than 100F.

When the supply of flame arrester is specified at "Note 1", specify an English letter among A to C.

2.24P&ID NO.

This indicates the P&ID number at which breather valve is shown.

2.25Remark

This indicates if there are items to be noted specially.

ex) 1) Toxicity of fluid : toxic service

2) when Sm3/hr is used : Converted into air at 15,1atm

3REVISION HISTORYRevDatePageRevision Status

006.08.23All- Team : Process Eng'g Team

- Made by : T.H. Lee- Checked by : J.C. Ro, E.D. Lee, Henry Sung, B.S. Son

- Approved by : C.S. Jung

SAMSUNG ENGINEERING CO., LTD.

SAMSUNG ENGINEERING CO., LTD

SAMSUNG SEI TOWER, 467-14 Dogok 2 Dong,

Kangnam-Ku, Seoul, KOREA 135-280

DESIGN MANUAL

SEM-9487E

PROCESS DESIGN MANUAL

Preparation of Datasheet

for Breather Valve

REV. : 0

DATE : 2006.8.23

PAGE

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