All propane cylinders will have a TW stamped in the valve protection ring. The tare weight or TW is the weight of the cylinder empty. TW 18 would be a 18 pound empty cylinder. â¦ If you weigh a TW 18 cylinder on a bathroom scale, and it weighs 28 pounds there would be 10 pounds of propane remaining in the cylinder.ll propane cylinders will have a TW stamped in the valve protection ring. The tare weight or TW is the weight of the cylinder empty. TW 18 would be a 18 pound empty cylinder. â¦ If you weigh a TW 18 cylinder on a bathroom scale, and it weighs 28 pounds there would be 10 pounds of propane remaining in the cylinder.
Although it is passed down from parents to children, about 1/3 of cases are caused by a spontaneous mutation, a change in a gene. According to the US Centers for Disease Control and Prevention, hemophilia occurs in approximately 1 in 5,000 live births. There are about 20,000 people with hemophilia in the US. All races and ethnic groups are affected. Hemophilia A is four times as common as hemophilia B while more than half of patients with hemophilia A have the severe form of hemophilia.
A female with one affected X chromosome is a carrier of hemophilia. Sometimes a female who is a carrier can have symptoms of hemophilia. In addition, she can pass the affected X chromosome with the clotting factor gene mutation on to her children.Learn more about the inheritance pattern for hemophilia.here are several different types of hemophilia. The following two are the most common: 1  Hemophilia A (Classic Hemophilia). 2  This type is caused by a lack or decrease of clotting factor VIII. 3  Hemophilia B (Christmas Disease). 4  This type is caused by a lack or decrease of clotting factor IX.