Size Limitation to use Seamless Pipe Size Limitation to use Seamless Pipe jonjose123 (Petroleum) (OP) 10 Jul 17 13:16 Hi All, Is there any size limitation to use seamless pipe in oil and gas application. In the tender client has mentioned to use seamless pipe for less than 16" size. Regards, B RE: Size Limitation to use Seamless Pipe weldstan (Materials) 10 Jul 17 13:29 The size is limited to the manufacturer's capability. Seamless is readily available up to 24" diameter and available (not readily) up to 36" diameter. Your client is factoring costs of larger diameter pipe above 16". Long seam fusion welded pipe is readily available in 18" and over diameters.