According to IS 903:1993, the short branch pipe for fire hydrants should generally comply with the following specifications:

1. Material:

   • The short branch pipe is typically made of gunmetal or any other material approved by the relevant authority.

2. Design:

   • The design should be such that it allows easy and efficient connection to the hydrant outlet.

3. Dimensions:

   • The dimensions of the short branch pipe, including its length and diameter, should adhere to the specifications outlined in the standard.

4. Threaded Connection:

   • The short branch pipe is usually designed with threaded connections to ensure a secure and leak-proof joint with the hydrant outlet.

5. Marking:

   • The short branch pipe should be clearly marked with relevant information such as manufacturer's name or trademark, year of manufacture, and the standard number (IS 903:1993).

6. Testing:

   • The short branch pipe may need to undergo various tests to ensure its compliance with the standard. These tests may include hydraulic tests to check for leaks and pressure resistance.

7. Finish:

   • The surface finish of the short branch pipe should be free from defects, and it may be coated or finished to provide protection against corrosion.

It's crucial to consult the latest version of the IS 903 standard for the most up-to-date and accurate information. Always adhere to the local regulations and standards enforced by the relevant authorities when it comes to fire safety equipment