E도 있고,F도 있습니다.

관련 문헌을 좀더 찾아 보시기 바랍니다.

ASME Sec.VIII has four joint categories (A to D) for pressure retaining parts.
As you know the joint categories are based on the possibility of failure by stress mode of Timosenko Theory.
They have different requirements for NDE, joint efficient (for strength calculation), and PWHT according to the weakest joint "A" (long seam in shell) through the most safety joint "D" (shell to nozzle). See the attachment.

The joint E & F are not controlled by ASME Sec. VIII. However most manufacturers are using the joint categories for their QA-QC program for all weld joints on pressure vessel. For instance, Joint E may be for reinforcement pad to shell in semi-pressure boundary while Joint F may be for non pressure boundary (i.e., skirt/saddle parts).

Meanwhile AWS D1.1 (Structural Welding Code-Steel) has some different categories (stress category) which are based on the possibility of failure by fatigue stress. It is completely different concept from that of ASME Sec. VIII.
The collapse of Sungsoo Bridge was caused by the violation of the stress category application (design vs. actual).

ASME VIII Div.1에는 Category A~D 까지만 나오고 그이상은
찾을 수가 없는데, 관련문헌을 알려주시거나,
직접 Category E에 대해 설명해 주시면 감사하겠습니다.

Here is the attachment.

ASMEPressureVesselJointCategory.pdf

AWS D1.1의 Table 2.4를 보시면 자세히 나와 있습니다.

아시는 바와 같이 ASME에서는 달랑 D까지만 나와 있는 데, ASHHTO나 AISC, AWS등에서는 좀더 다양하게 구분하고 있습니다.