Gilson and Voss - Voss Associates

AIR FLOW METER CORRECTIONS
Mass Flow Meters
Q S = Q A (P A /P S x T S /T A )
Q A = Q S (P S /P A x T A /T S )
where; Q S is the STP flow rate
Q A is the ambient flow rate
P S is STP pressure
P A is the ambient pressure
T S is STP temperature
T A is the ambient temperature
Rotameter Corrections
Q S = Q I x P S /P A x T S /T A
√(P S /P I x T A /T S )
where; Q I is the rotameter flow indication
P I is the actual pressure inside the rotameter.
This correction assumes the rotameter markings are
correct at STP. The actual pressure inside the rotameter
should be used in the calculations.
For personnel protection against particulate airborne
radioactivity ambient sample volumes instead of volumes
corrected to STP should be used for calculations. The
ambient respiratory rate will remain the same as
atmospheric pressure changes from STP up to an elevation
of approximately 12,000 feet (3,660 Meters).
Page 71
AIR FLOW METER CORRECTIONS
Mass Flow Meters
Q S = Q A (P A /P S x T S /T A )
Q A = Q S (P S /P A x T A /T S )
where; Q S is the STP flow rate
Q A is the ambient flow rate
P S is STP pressure
P A is the ambient pressure
T S is STP temperature
T A is the ambient temperature
Rotameter Corrections
Q S = Q I x P S /P A x T S /T A
√(P S /P I x T A /T S )
where; Q I is the rotameter flow indication
P I is the actual pressure inside the rotameter.
This correction assumes the rotameter markings are
correct at STP. The actual pressure inside the rotameter
should be used in the calculations.
For personnel protection against particulate airborne
radioactivity ambient sample volumes instead of volumes
corrected to STP should be used for calculations. The
ambient respiratory rate will remain the same as
atmospheric pressure changes from STP up to an elevation
of approximately 12,000 feet (3,660 Meters).
Page 71
AIR FLOW METER CORRECTIONS
Mass Flow Meters
Q S = Q A (P A /P S x T S /T A )
Q A = Q S (P S /P A x T A /T S )
where; Q S is the STP flow rate
Q A is the ambient flow rate
P S is STP pressure
P A is the ambient pressure
T S is STP temperature
T A is the ambient temperature
Rotameter Corrections
Q S = Q I x P S /P A x T S /T A
√(P S /P I x T A /T S )
where; Q I is the rotameter flow indication
P I is the actual pressure inside the rotameter.
This correction assumes the rotameter markings are
correct at STP. The actual pressure inside the rotameter
should be used in the calculations.
For personnel protection against particulate airborne
radioactivity ambient sample volumes instead of volumes
corrected to STP should be used for calculations. The
ambient respiratory rate will remain the same as
atmospheric pressure changes from STP up to an elevation
of approximately 12,000 feet (3,660 Meters).
Page 71
AIR FLOW METER CORRECTIONS
Mass Flow Meters
Q S = Q A (P A /P S x T S /T A )
Q A = Q S (P S /P A x T A /T S )
where; Q S is the STP flow rate
Q A is the ambient flow rate
P S is STP pressure
P A is the ambient pressure
T S is STP temperature
T A is the ambient temperature
Rotameter Corrections
Q S = Q I x P S /P A x T S /T A
√(P S /P I x T A /T S )
where; Q I is the rotameter flow indication
P I is the actual pressure inside the rotameter.
This correction assumes the rotameter markings are
correct at STP. The actual pressure inside the rotameter
should be used in the calculations.
For personnel protection against particulate airborne
radioactivity ambient sample volumes instead of volumes
corrected to STP should be used for calculations. The
ambient respiratory rate will remain the same as
atmospheric pressure changes from STP up to an elevation
of approximately 12,000 feet (3,660 Meters).
Page 71