# P&ID tag number

**URL:** <https://forumautomation.com/t/p-id-tag-number/11531>\
**Category:** Uncategorized\
**Created:** [October 14, 2023, 5:43am UTC](https://forumautomation.com/t/p-id-tag-number/11531 "2023-10-14T05:43:08Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Andrewpan](https://forumautomation.com/letter_avatar_proxy/v4/letter/a/87869e/32.png) [@Andrewpan](https://forumautomation.com/u/Andrewpan)\
**Post date:** [October 14, 2023, 5:43am UTC](https://forumautomation.com/t/p-id-tag-number/11531/1 "2023-10-14T05:43:08Z")

</div>

could you tell me what it means by XYX, XHS in the following P&ID of the polypropylene production. thank you.

 ![image](https://cdn.forumautomation.com/original/2X/1/16d14f1680de5c7881dc37fc9d1a1eb57992ff52.png)

---

<div class="post-metadata">

**Author:** ![Instrument\_Engineer](https://forumautomation.com/user_avatar/forumautomation.com/instrument_engineer/32/6734_2.png) [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Post date:** [October 18, 2023, 11:24am UTC](https://forumautomation.com/t/p-id-tag-number/11531/2 "2023-10-18T11:24:47Z")

</div>

![image](https://cdn.forumautomation.com/original/2X/4/44fb52f6908505aaf6afbd73ceb968b257a37c69.png)

XYX is Solenoid valve that is supplying the instrument air(IA) to operate the shut off valve XV10101 and XV10102 XHS is operating open / close command from the control system or control room to the Solenoid valve that is supplying instrument air(IA) to operate the shut off valve XV10101 and XV10102