supply of spares of mechanical seal , supply of items as per following specifications , compression unit ( in ) primary , p . no . 45a , part code - xexn2500nbn in flowserve drawing no . 2h-20648 rev . 1 of mechanical seal for ammonia product pump p-501a/b . vendor - m/s . flowserve sanmar ltd . , compression unit secondary , p . no . 45 , part code - xexn2250nbs in flowserve drawing no . 2h-20648 rev . 1 of mechanical seal for ammonia product pump p-501a/b . vendor - m/s . flowserve sanmar ltd . , carbon insert ( in ) primary , p . no . 2a , part code - y5fq25oolu3 in flowserve drawing no . 2h-20648 rev . 1 of mechanical seal for ammonia product pump p-501a/b . vendor - m/s . flowserve sanmar ltd . , carbon insert secondary , p . no . 2 , part code - y5fq2250maz in flowserve drawing no . 2h-20648 rev . 1 of mechanical seal for ammonia product pump p-501a/b . vendor - m/s . flowserve sanmar ltd . , ring o for insert holder of mech . seal of p-501 a/b as per drawing no . 2h-20648 . , shaft packaging v ring in set of 2 nos . -teflon- secondary p-501a/b drawing no: 2h-20648 part no:p , shaft packing primary 2 . 500 ( v rings ) drg no . 2h-20648-for pump p- a/b mfr-dura , part no: p1 , shaft sleeve gasket for mech . seal of p-501 a/b size:65 . 6 x 40 x 2 mm thick . material:teflon . , mounting insert-primary-wedge ring for p-501a/b drawing no:2h-2 1318 part no-7a , insert mounting-wedge ring-teflon-secondary for p-501a/b , seal ring ( in ) primary , tandem pt , 2 . 5 , part no . 3a , part code - kebt2500333 in flowserve drawing no . 2h-20648 rev . 1 of mechanical seal for ammonia product pump p-501a/b . vendor - m/s . flowserve sanmar ltd . , seal ring secondary , tandem pt , 2 . 5 , part no . 3 , part code - kemt2250la3 in flowserve drawing no . 2h-20648 rev . 1 of mechanical seal for ammonia product pump p-501a/b . vendor - m/s . flowserve sanmar ltd .