PE=Plain end=平口
	

	

		BE=Beveled end=坡口
	

	

		BW=Butt welding=对焊
	

	

		SW=Socket welding=承插焊
	

	

		NPT=National pipe thread=美标螺纹
	

	

		PBE=Plain both ends=两端平口
	

	

		PLE=Plain large end=大端平口
	

	

		PSE=Plain small end=小端平口
	

	

		POE=Plain one end=一端平口
	

	

		TOE=Thread one end=一端螺纹
	

	

		TBE=Thread both ends=两端螺纹
	

	

		TLE=Thread large end=大端螺纹
	

	

		TSE=Thread small end=小端螺纹
	

	

		BBE=Bevel both ends=两端坡口 
	

	

		
	

	

		BLE=Bevel large end=大端坡口
	

	

		BSE=Bevel small end=小端坡口